1YQ4 - JenaLib

Asym./Biol. Unit (Jmol Viewer)

Asym./Biol. Unit - sites (Jmol Viewer)

Title :   AVIAN RESPIRATORY COMPLEX II WITH 3-NITROPROPIONATE AND UBIQUINONE

Authors :   L. Huang, G. Sun, D. Cobessi, A. Wang, J. T. Shen, E. Y. Tung, V. E. Anderso E. A. Berry

Date :   01 Feb 05 (Deposition) - 20 Dec 05 (Release) - 17 Feb 16 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   2.33

Chains :   Asym./Biol. Unit : A,B,C,D

Keywords :   Complex Ii, Membrane Protein, Heme Protein, Iron Sulfur Protein, Cytochrome B, Oxidoreductase, Redox Enzyme, Respiratory Chain, Oxaloacetate Nitropropionate Ubiquinone (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   L. Huang, G. Sun, D. Cobessi, A. C. Wang, J. T. Shen, E. Y. Tung, V. E. Anderson, E. A. Berry
3-Nitropropionic Acid Is A Suicide Inhibitor Of Mitochondrial Respiration That, Upon Oxidation By Complex Ii, Forms A Covalent Adduct With A Catalytic Base Arginine In The Active Site Of The Enzyme
J. Biol. Chem. V. 281 5965 2006
PubMed-ID: 16371358 | Reference-DOI: 10.1074/JBC.M511270200
(for further references see the PDB file header)

Molecule 1 - SUCCINATE DEHYDROGENASE FLAVOPROTEIN SUBUNIT
	Chains	:	A
	EC Number	:	1.3.5.1
	Organism Common	:	CHICKEN
	Organism Scientific	:	GALLUS GALLUS
	Organism Taxid	:	9031
	Synonym	:	FP, FLAVOPROTEIN SUBUNIT OF COMPLEX II

Molecule 2 - SUCCINATE DEHYDROGENASE IP SUBUNIT
	Chains	:	B
	EC Number	:	1.3.5.1
	Organism Common	:	CHICKEN
	Organism Scientific	:	GALLUS GALLUS
	Organism Taxid	:	9031

Molecule 3 - SUCCINATE DEHYDROGENASE CYTOCHROME B, LARGE SUBUNIT
	Chains	:	C
	EC Number	:	1.3.5.1
	Organism Common	:	CHICKEN
	Organism Scientific	:	GALLUS GALLUS
	Organism Taxid	:	9031

Molecule 4 - SUCCINATE DEHYDROGENASE CYTOCHROME B, SMALL SUBUNIT
	Chains	:	D
	EC Number	:	1.3.5.1
	Organism Common	:	CHICKEN
	Organism Scientific	:	GALLUS GALLUS
	Organism Taxid	:	9031

		1	2	3	4
Asymmetric/Biological Unit	:	A	B	C	D

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (10, 11)

No.	Name	Count	Type	Full Name
1	3NP	1	Ligand/Ion	3-NITROPROPANOIC ACID
2	F3S	1	Ligand/Ion	FE3-S4 CLUSTER
3	FAD	1	Ligand/Ion	FLAVIN-ADENINE DINUCLEOTIDE
4	FES	1	Ligand/Ion	FE2/S2 (INORGANIC) CLUSTER
5	GOL	1	Ligand/Ion	GLYCEROL
6	HEM	1	Ligand/Ion	PROTOPORPHYRIN IX CONTAINING FE
7	JZR	1	Ligand/Ion	HEXYL BETA-D-GLUCOPYRANOSIDE
8	PEE	2	Ligand/Ion	1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
9	SF4	1	Ligand/Ion	IRON/SULFUR CLUSTER
10	UQ	1	Ligand/Ion	COENZYME Q10, (2Z,6E,10Z,14E,18E,22E,26Z)-ISOMER

Asymmetric Unit (11, 11)

No.	Name	Evidence	Residues	Description
01	AC1	SOFTWARE	LYS C:31 , TRP C:32 , SER C:33 , LEU C:34 , PRO C:35 , GLU C:120 , HOH C:1357 , TYR D:88 , TYR D:89	BINDING SITE FOR RESIDUE JZR C 142
02	AC2	SOFTWARE	GLY A:25 , ALA A:26 , GLY A:27 , GLY A:28 , ALA A:29 , VAL A:47 , THR A:48 , LYS A:49 , LEU A:50 , SER A:55 , HIS A:56 , THR A:57 , ALA A:59 , ALA A:60 , GLN A:61 , GLY A:62 , GLY A:63 , TYR A:176 , PHE A:177 , ALA A:178 , ALA A:212 , THR A:213 , GLY A:214 , THR A:224 , ASP A:232 , LEU A:263 , HIS A:364 , TYR A:365 , GLY A:396 , GLU A:397 , ARG A:408 , ALA A:411 , ASN A:412 , SER A:413 , LEU A:414 , LEU A:417 , 3NP A:1002 , HOH A:1008 , HOH A:1022 , HOH A:1045 , HOH A:1048 , HOH A:1063 , HOH B:1022	BINDING SITE FOR RESIDUE FAD A 1001
03	AC3	SOFTWARE	SER B:64 , CYS B:65 , ARG B:66 , GLY B:68 , CYS B:70 , GLY B:71 , CYS B:73 , CYS B:85	BINDING SITE FOR RESIDUE FES B 1002
04	AC4	SOFTWARE	CYS B:158 , ILE B:159 , CYS B:161 , ALA B:162 , CYS B:164 , MET B:185 , CYS B:225 , PRO B:226	BINDING SITE FOR RESIDUE SF4 B 1003
05	AC5	SOFTWARE	CYS B:168 , TYR B:178 , CYS B:215 , HIS B:216 , ILE B:218 , MET B:219 , ASN B:220 , CYS B:221	BINDING SITE FOR RESIDUE F3S B 1004
06	AC6	SOFTWARE	HIS B:216 , HIS C:42 , ARG C:43 , GLY C:46 , VAL C:47 , LEU C:49 , SER C:50 , HIS C:98 , HIS C:105 , HOH C:1509 , HOH C:1522 , HOH C:1525 , LEU D:20 , HIS D:46 , GLY D:50 , HOH D:1098	BINDING SITE FOR RESIDUE HEM C 143
07	AC7	SOFTWARE	GLY A:62 , PHE A:130 , HIS A:253 , THR A:265 , GLU A:266 , ARG A:297 , HIS A:364 , ARG A:408 , FAD A:1001	BINDING SITE FOR RESIDUE 3NP A 1002
08	AC8	SOFTWARE	PRO B:169 , TRP B:173 , ILE B:218 , ILE C:27 , TRP C:32 , MET C:36 , SER C:39 , ILE C:40 , ARG C:43 , HOH C:1006 , TYR D:58	BINDING SITE FOR RESIDUE UQ C 144
09	AC9	SOFTWARE	LEU D:24 , ALA D:27 , TYR D:28 , LEU D:39 , VAL D:97 , TRP D:101 , HOH D:1363	BINDING SITE FOR RESIDUE PEE D 104
10	BC1	SOFTWARE	LEU C:95 , TRP C:100 , ALA D:18 , GLY D:22	BINDING SITE FOR RESIDUE PEE C 145
11	BC2	SOFTWARE	ILE B:11 , LYS B:13 , LEU B:93	BINDING SITE FOR RESIDUE GOL B 1005

(no "SS Bond" information available for 1YQ4)

Asymmetric/Biological Unit

No.	Residues
1	Ala A:401	-	Ser A:402

(no "SAP(SNP)/Variant" information available for 1YQ4)

Asymmetric/Biological Unit (5, 5)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	2FE2S_FER_2	PS51085	2Fe-2S ferredoxin-type iron-sulfur binding domain profile.	SDHB_CHICK	50-143	1	B:12-105
2	FRD_SDH_FAD_BINDING	PS00504	Fumarate reductase / succinate dehydrogenase FAD-binding site.	SDHA_CHICK	98-107	1	A:54-63
3	2FE2S_FER_1	PS00197	2Fe-2S ferredoxin-type iron-sulfur binding region signature.	SDHB_CHICK	103-111	1	B:65-73
4	4FE4S_FER_2	PS51379	4Fe-4S ferredoxin-type iron-sulfur binding domain profile.	SDHB_CHICK	186-216	1	B:148-178
5	4FE4S_FER_1	PS00198	4Fe-4S ferredoxin-type iron-sulfur binding region signature.	SDHB_CHICK	196-207	1	B:158-169

(no "Exon" information available for 1YQ4)

Asymmetric/Biological Unit

Reformat:	Number of residues per line = ('0' or empty: single-line sequence representation)
	Number of residues per labelling interval =
	UniProt sequence: complete aligned part

Show mapping:	SCOP domains	CATH domains	Pfam domains	Secondary structure (by author)
	SAPs(SNPs)	PROSITE motifs	Exons
	(details for a mapped element are shown in a popup box when the mouse pointer rests over it)

Chain A from PDB  Type:PROTEIN  Length:614
 aligned with SDHA_CHICK | Q9YHT1 from UniProtKB/Swiss-Prot  Length:665

    Alignment length:614
                                    61        71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351       361       371       381       391       401       411       421       431       441       451       461       471       481       491       501       511       521       531       541       551       561       571       581       591       601       611       621       631       641       651       661    
           SDHA_CHICK    52 ISTQYPVVDHEFDAVVVGAGGAGLRAAFGLSEAGFNTACVTKLFPTRSHTVAAQGGINAALGNMEDDNWRWHFYDTVKGSDWLGDQDAIHYMTEQAPAAVIELENYGMPFSRTEEGKIYQRAFGGQSLQFGKGGQAHRCCCVADRTGHSLLHTLYGRSLRYDTSYFVEYFALDLLMENGECRGVIALCIEDGTIHRFRAKNTVIATGGYGRTYFSCTSAHTSTGDGTAMVTRAGLPCQDLEFVQFHPTGIYGAGCLITEGCRGEGGILINSQGERFMERYAPVAKDLASRDVVSRSMTIEIREGRGCGPEKDHVYLQLHHLPPQQLATRLPGISETAMIFAGVDVTKEPIPVLPTVHYNMGGIPTNYKGQVITHVNGEDKVVPGLYACGEAASASVHGANRLGANSLLDLVVFGRACALTIAETCKPGEPVPSIKPNAGEESVANLDKLRFADGTIRTSEARLNMQKTMQSHAAVFRTGSILQEGCEKLSQIYCDLAHLKTFDRGIVWNTDLVETLELQNLMLCALQTIYGAEARKESRGAHAREDYKFRIDDFDYSKPLQGQQKRPFEEHWRKHTLSYVDVKSGKVTLKYRPVIDRTLNEEDCSSVPPAIRSY 665
               SCOP domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SCOP domains
               CATH domains 1yq4A01 A:8-256,A:361-439  [code=3.50.50.60, no name defined]                                                                                                                                                                                            --------------------------------------------------------------------------------------------------------1yq4A01 A:8-256,A:361-439  [code=3.50.50.60, no name defined]                  1yq4A03 A:440-556  [code=1.20.58.100, no name defined]                                                               1yq4A04 A:557-621 succinate dehydrogenase protein domain          CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ......eeeee..eeee..hhhhhhhhhhhhhh...eeeee..hhhhhhhhhh...ee.........hhhhhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhh.............ee......hhhhh......ee....hhhhhhhhhhhhhhh....eeee.eeeeeeeee..eeeeeeeee....eeeeee..eeee....hhhhh..........hhhhhhhhhh...ee....eeeeeeee........hhhhhh..eee......hhhhhh..hhhhhhhhhhhhhhhhhhhh..........eeee....hhhhhhhhhhhhhhhhhhhhh.......eeeeeeeeee...ee.....eeeeee..eeeeeeeeee....ee...........hhhhhhhhhhhhhhhhhhhhh.............hhhhhhhhhhhhhh...eehhhhhhhhhhhhhhhh..eehhhhhhhhhhhhhhhhhh...ee........hhhhhhhhhhhhhhhhhhhhhhhhhhh.......ee......................hhhhh..eeeeeeee....eeeeeeee..................... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (2) ----------------------------------------------FRD_SDH_FA------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE (2)
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yq4 A   8 ISTQYPVVDHEFDAVVVGAGGAGLRAAFGLSEAGFNTACVTKLFPTRSHTVAAQGGINAALGNMEDDNWRWHFYDTVKGSDWLGDQDAIHYMTEQAPAAVIELENYGMPFSRTEEGKIYQRAFGGQSLQFGKGGQAHRCCCVADRTGHSLLHTLYGRSLRYDTSYFVEYFALDLLMENGECRGVIALCIEDGTIHRFRAKNTVIATGGYGRTYFSCTSAHTSTGDGTAMVTRAGLPCQDLEFVQFHPTGIYGAGCLITEGCRGEGGILINSQGERFMERYAPVAKDLASRDVVSRSMTIEIREGRGCGPEKDHVYLQLHHLPPQQLATRLPGISETAMIFAGVDVTKEPIPVLPTVHYNMGGIPTNYKGQVITHVNGEDKVVPGLYACGEAASASVHGANRLGANSLLDLVVFGRACALTIAETCKPGEPVPSIKPNAGEESVANLDKLRFADGTIRTSEARLNMQKTMQSHAAVFRTGSILQEGCEKLSQIYRDLAHLKTFDRGIVWNTDLVETLELQNLMLCALQTIYGAEARKESRGAHAREDYKLRIDEFDYSKPLQGQQKRPFEEHWRKHTLSYVDVKSGKVTLKYRPVIDRTLNEEDCSSVPPAIRSY 621
                                    17        27        37        47        57        67        77        87        97       107       117       127       137       147       157       167       177       187       197       207       217       227       237       247       257       267       277       287       297       307       317       327       337       347       357       367       377       387       397       407       417       427       437       447       457       467       477       487       497       507       517       527       537       547       557       567       577       587       597       607       617

Chain B from PDB  Type:PROTEIN  Length:242
 aligned with SDHB_CHICK | Q9YHT2 from UniProtKB/Swiss-Prot  Length:290

    Alignment length:242
                                    53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213       223       233       243       253       263       273       283  
           SDHB_CHICK    44 AATSRIKKFSIYRWDPDKPGDKPRMQTYEVDLNKCGPMVLDALIKIKNELDSTLTFRRSCREGICGSCAMNIAGGNTLACTKKIDPDLSKTTKIYPLPHMYVVKDLVPDLSNFYAQYKSIEPYLKKKDESKQGKEQYLQSIEDRQKLDGLYECILCACCSTSCPSYWWNGDKYLGPAVLMQAYRWMIDSRDDYTEERLAQLQDPFSLYRCHTIMNCTRTCPKGLNPGKAIAEIKKMMATYKE 285
               SCOP domains d1yq4b1 B:6-114 Succinate dehydogenase iron-sulfur protein, N-terminal domain                                d1yq4b2 B:115-247 Succinate dehydogenase                                                                                              SCOP domains
               CATH domains 1yq4B01 B:6-114  [code=3.10.20.30, no name defined]                                                          1yq4B02 B:115-247 Fumarate Reductase Iron-sulfur Protein; Chain B, domain 2                                                           CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .....eeeeeeee..........eeeeeeee.hhh..hhhhhhhhhhhhh..................eeee..eeee.hhh........eeeee......eee..ee.hhhhhhhhhhh...................hhhhhhh............hhhhhhhhhhhh....hhhhhhhhhhhhh.....hhhhhhhh.............hhhhhhh....hhhhhhhhhhhhhh.... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) ------2FE2S_FER_2  PDB: B:12-105 UniProt: 50-143                                                    ------------------------------------------4FE4S_FER_2  PDB: B:148-178    --------------------------------------------------------------------- PROSITE (1)
                PROSITE (2) --------------------------------------------------------------------------------------------------------------------------------------------------------4FE4S_FER_1 ------------------------------------------------------------------------------ PROSITE (2)
                PROSITE (3) -----------------------------------------------------------2FE2S_FER------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE (3)
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yq4 B   6 AATSRIKKFSIYRWDPDKPGDKPRMQTYEVDLNKCGPMVLDALIKIKNELDSTLTFRRSCREGICGSCAMNIAGGNTLACTKKIDPDLSKTTKIYPLPHMYVVKDLVPDLSNFYAQYKSIEPYLKKKDESKQGKEQYLQSIEDRQKLDGLYECILCACCSTSCPSYWWNGDKYLGPAVLMQAYRWMIDSRDDYTEERLAQLQDPFSLYRCHTIMNCTRTCPKGLNPGKAIAEIKKMMATYKE 247
                                    15        25        35        45        55        65        75        85        95       105       115       125       135       145       155       165       175       185       195       205       215       225       235       245

Chain C from PDB  Type:PROTEIN  Length:140
 aligned with D0VWW3_CHICK | D0VWW3 from UniProtKB/TrEMBL  Length:140

    Alignment length:140
                                                                                                                                                                    140 
                                    11        21        31        41        51        61        71        81        91       101       111       121       131        |-
         D0VWW3_CHICK     2 ATTAKEEMARFWEKNTKSSRPLSPHISIYKWSLPMAMSITHRGTGVALSLGVSLFSLAALLLPEQFPHYVAVVKSLSLSPALIYSAKFALVFPLSYHTWNGIRHLVWDMGKGFKLSQVEQSGVVVLILTLLSSAAIASE-   -
               SCOP domains d1yq4c_ C: automated matches                                                                                                                 SCOP domains
               CATH domains 1yq4C01 C:2-32 Single helix bin1yq4C02 C:33-141 Fumarate reductase respiratory complex transmembrane subunits                                CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..hhhhhhhhhhhhhhh..............hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhh...hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhhhhhh. Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yq4 C   2 ATTAKEEMARFWEKNTKSSRPLSPHISIYKWSLPMAMSITHRGTGVALSLGVSLFSLAALLLPEQFPHYVAVVKSLSLSPALIYSAKFALVFPLSYHTWNGIRHLVWDMGKGFKLSQVEQSGVVVLILTLLSSAGIAAIS 141
                                    11        21        31        41        51        61        71        81        91       101       111       121       131       141

Chain D from PDB  Type:PROTEIN  Length:102
 aligned with DHSD_CHICK | Q5ZIS0 from UniProtKB/Swiss-Prot  Length:157

    Alignment length:102
                                    65        75        85        95       105       115       125       135       145       155  
           DHSD_CHICK    56 SSKAASLHWTSERAVSALLLGLLPAAYLYPGPAVDYSLAAALTLHGHWGLGQVITDYVHGDTPIKVANTGLYVLSAITFTGLCYFNYYDVGICKAVAMLWSI 157
               SCOP domains d1yq4d_ D: automated matches                                                                           SCOP domains
               CATH domains 1yq4D00 D:2-103 Fumarate reductase respiratory complex transmembrane subunits                          CATH domains
               Pfam domains CybS-1yq4D01 D:2-102                                                                                 - Pfam domains
         Sec.struct. author ..hhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.hhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------ Transcript
                 1yq4 D   2 SSKAASLHWTSERAVSALLLGLLPAAYLYPGPAVDYSLAAALTLHGHWGLGQVITDYVHGDTPIKVANTGLYVLSAITFTGLCYFNYYDVGICKAVAMLWSI 103
                                    11        21        31        41        51        61        71        81        91       101

Legend:		→ Mismatch	(orange background)
	-	→ Gap	(green background, '-', border residues have a numbering label)
		→ Modified Residue	(blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
	x	→ Chemical Group	(purple background, 'x', labelled with number + name, e.g. ACE or NH2)
	extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '\|'

Asymmetric/Biological Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: FumRed-TM (17)

Family: CybS (3)

Gallus gallus (Chicken) (2)

CybS-1yq4D01

D:2-102

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (SDHA_CHICK | Q9YHT1)

molecular function
	GO:0050660	flavin adenine dinucleotide binding	Interacting selectively and non-covalently with FAD, flavin-adenine dinucleotide, the coenzyme or the prosthetic group of various flavoprotein oxidoreductase enzymes, in either the oxidized form, FAD, or the reduced form, FADH2.
	GO:0016491	oxidoreductase activity	Catalysis of an oxidation-reduction (redox) reaction, a reversible chemical reaction in which the oxidation state of an atom or atoms within a molecule is altered. One substrate acts as a hydrogen or electron donor and becomes oxidized, while the other acts as hydrogen or electron acceptor and becomes reduced.
	GO:0016627	oxidoreductase activity, acting on the CH-CH group of donors	Catalysis of an oxidation-reduction (redox) reaction in which a CH-CH group acts as a hydrogen or electron donor and reduces a hydrogen or electron acceptor.
	GO:0008177	succinate dehydrogenase (ubiquinone) activity	Catalysis of the reaction: succinate + ubiquinone = fumarate + ubiquinol.
	GO:0000104	succinate dehydrogenase activity	Catalysis of the reaction: succinate + acceptor = fumarate + reduced acceptor.
biological process
	GO:0022900	electron transport chain	A process in which a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient.
	GO:0055114	oxidation-reduction process	A metabolic process that results in the removal or addition of one or more electrons to or from a substance, with or without the concomitant removal or addition of a proton or protons.
	GO:0022904	respiratory electron transport chain	A process in which a series of electron carriers operate together to transfer electrons from donors such as NADH and FADH2 to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient.
	GO:0006105	succinate metabolic process	The chemical reactions and pathways involving succinate, also known as butanedioate or ethane dicarboxylate, the dianion of succinic acid. Succinate is an important intermediate in metabolism and a component of the TCA cycle.
	GO:0006099	tricarboxylic acid cycle	A nearly universal metabolic pathway in which the acetyl group of acetyl coenzyme A is effectively oxidized to two CO2 and four pairs of electrons are transferred to coenzymes. The acetyl group combines with oxaloacetate to form citrate, which undergoes successive transformations to isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate again, thus completing the cycle. In eukaryotes the tricarboxylic acid is confined to the mitochondria. See also glyoxylate cycle.
cellular component
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005743	mitochondrial inner membrane	The inner, i.e. lumen-facing, lipid bilayer of the mitochondrial envelope. It is highly folded to form cristae.
	GO:0005749	mitochondrial respiratory chain complex II, succinate dehydrogenase complex (ubiquinone)	A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains the four polypeptide subunits of succinate dehydrogenase, flavin-adenine dinucleotide and iron-sulfur. Catalyzes the oxidation of succinate by ubiquinone. Connects the TCA cycle with the respiratory chain.
	GO:0005739	mitochondrion	A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration.

Chain B (SDHB_CHICK | Q9YHT2)

molecular function
	GO:0051537	2 iron, 2 sulfur cluster binding	Interacting selectively and non-covalently with a 2 iron, 2 sulfur (2Fe-2S) cluster; this cluster consists of two iron atoms, with two inorganic sulfur atoms found between the irons and acting as bridging ligands.
	GO:0051538	3 iron, 4 sulfur cluster binding	Interacting selectively and non-covalently with a 3 iron, 4 sulfur (3Fe-4S) cluster; this cluster consists of three iron atoms, with the inorganic sulfur atoms found between the irons and acting as bridging ligands. It is essentially a 4Fe-4S cluster with one iron missing.
	GO:0051539	4 iron, 4 sulfur cluster binding	Interacting selectively and non-covalently with a 4 iron, 4 sulfur (4Fe-4S) cluster; this cluster consists of four iron atoms, with the inorganic sulfur atoms found between the irons and acting as bridging ligands.
	GO:0009055	electron carrier activity	Any molecular entity that serves as an electron acceptor and electron donor in an electron transport chain. An electron transport chain is a process in which a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient.
	GO:0051536	iron-sulfur cluster binding	Interacting selectively and non-covalently with an iron-sulfur cluster, a combination of iron and sulfur atoms.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0016491	oxidoreductase activity	Catalysis of an oxidation-reduction (redox) reaction, a reversible chemical reaction in which the oxidation state of an atom or atoms within a molecule is altered. One substrate acts as a hydrogen or electron donor and becomes oxidized, while the other acts as hydrogen or electron acceptor and becomes reduced.
	GO:0008177	succinate dehydrogenase (ubiquinone) activity	Catalysis of the reaction: succinate + ubiquinone = fumarate + ubiquinol.
	GO:0048039	ubiquinone binding	Interacting selectively and non-covalently with ubiquinone, a quinone derivative with a tail of isoprene units.
biological process
	GO:0055114	oxidation-reduction process	A metabolic process that results in the removal or addition of one or more electrons to or from a substance, with or without the concomitant removal or addition of a proton or protons.
	GO:0006099	tricarboxylic acid cycle	A nearly universal metabolic pathway in which the acetyl group of acetyl coenzyme A is effectively oxidized to two CO2 and four pairs of electrons are transferred to coenzymes. The acetyl group combines with oxaloacetate to form citrate, which undergoes successive transformations to isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate again, thus completing the cycle. In eukaryotes the tricarboxylic acid is confined to the mitochondria. See also glyoxylate cycle.
cellular component
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005743	mitochondrial inner membrane	The inner, i.e. lumen-facing, lipid bilayer of the mitochondrial envelope. It is highly folded to form cristae.
	GO:0005749	mitochondrial respiratory chain complex II, succinate dehydrogenase complex (ubiquinone)	A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains the four polypeptide subunits of succinate dehydrogenase, flavin-adenine dinucleotide and iron-sulfur. Catalyzes the oxidation of succinate by ubiquinone. Connects the TCA cycle with the respiratory chain.
	GO:0005739	mitochondrion	A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration.

Chain C (D0VWW3_CHICK | D0VWW3)

molecular function
	GO:0009055	electron carrier activity	Any molecular entity that serves as an electron acceptor and electron donor in an electron transport chain. An electron transport chain is a process in which a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0016627	oxidoreductase activity, acting on the CH-CH group of donors	Catalysis of an oxidation-reduction (redox) reaction in which a CH-CH group acts as a hydrogen or electron donor and reduces a hydrogen or electron acceptor.
	GO:0008177	succinate dehydrogenase (ubiquinone) activity	Catalysis of the reaction: succinate + ubiquinone = fumarate + ubiquinol.
	GO:0000104	succinate dehydrogenase activity	Catalysis of the reaction: succinate + acceptor = fumarate + reduced acceptor.
biological process
	GO:0006099	tricarboxylic acid cycle	A nearly universal metabolic pathway in which the acetyl group of acetyl coenzyme A is effectively oxidized to two CO2 and four pairs of electrons are transferred to coenzymes. The acetyl group combines with oxaloacetate to form citrate, which undergoes successive transformations to isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate again, thus completing the cycle. In eukaryotes the tricarboxylic acid is confined to the mitochondria. See also glyoxylate cycle.
cellular component
	GO:0016021	integral component of membrane	The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005739	mitochondrion	A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration.
	GO:0045281	succinate dehydrogenase complex	A multimeric complex which consists of flavoprotein (subunit A ; InterPro:IPR003952), iron-sulfur protein (subunit B) and membrane-bound cytochrome b560 (subunit C; InterPro:IPR000701). In some Archaea, the membrane-bound subunits (C or C and D) do not necessarily contain heme. Membrane-bound subunits can bind or react with quinones.

Chain D (DHSD_CHICK | Q5ZIS0)

molecular function
	GO:0020037	heme binding	Interacting selectively and non-covalently with heme, any compound of iron complexed in a porphyrin (tetrapyrrole) ring.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0000104	succinate dehydrogenase activity	Catalysis of the reaction: succinate + acceptor = fumarate + reduced acceptor.
	GO:0048039	ubiquinone binding	Interacting selectively and non-covalently with ubiquinone, a quinone derivative with a tail of isoprene units.
biological process
	GO:0055114	oxidation-reduction process	A metabolic process that results in the removal or addition of one or more electrons to or from a substance, with or without the concomitant removal or addition of a proton or protons.
	GO:0006099	tricarboxylic acid cycle	A nearly universal metabolic pathway in which the acetyl group of acetyl coenzyme A is effectively oxidized to two CO2 and four pairs of electrons are transferred to coenzymes. The acetyl group combines with oxaloacetate to form citrate, which undergoes successive transformations to isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate again, thus completing the cycle. In eukaryotes the tricarboxylic acid is confined to the mitochondria. See also glyoxylate cycle.
cellular component
	GO:0016021	integral component of membrane	The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005740	mitochondrial envelope	The double lipid bilayer enclosing the mitochondrion and separating its contents from the cell cytoplasm; includes the intermembrane space.
	GO:0005743	mitochondrial inner membrane	The inner, i.e. lumen-facing, lipid bilayer of the mitochondrial envelope. It is highly folded to form cristae.
	GO:0005749	mitochondrial respiratory chain complex II, succinate dehydrogenase complex (ubiquinone)	A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains the four polypeptide subunits of succinate dehydrogenase, flavin-adenine dinucleotide and iron-sulfur. Catalyzes the oxidation of succinate by ubiquinone. Connects the TCA cycle with the respiratory chain.
	GO:0005739	mitochondrion	A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration.

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	Cis Peptide Bonds
		Ala A:401 - Ser A:402	[ RasMol ]

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	1yq4
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	DHSD_CHICK \| Q5ZIS0	:	1yq3 2fbw 2h88 2h89 2wqy
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Description

Compounds

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (10, 11)

Sites (11, 11)

SS Bonds (0, 0)

Cis Peptide Bonds (1, 1)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

PROSITE Motifs (5, 5)

Exons (0, 0)

Sequences/Alignments

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SCOP Domains (3, 4)

CATH Domains (7, 8)

Pfam Domains (1, 1)

Gene Ontology (25, 51)

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