1SKY - JenaLib

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Title :   CRYSTAL STRUCTURE OF THE NUCLEOTIDE FREE ALPHA3BETA3 SUB-COMPLEX OF F1-ATPASE FROM THE THERMOPHILIC BACILLUS PS3

Authors :   Y. Shirakihara, A. G. W. Leslie, J. P. Abrahams, J. E. Walker, T. Ueda, Y. M. Kambara, K. Saika, Y. Kagawa, M. Yoshida

Date :   26 Feb 97 (Deposition) - 04 Mar 98 (Release) - 12 Mar 14 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   3.20

Chains :   Asym. Unit : B,E
Biol. Unit 1: B,E  (3x)

Keywords :   Atp Synthase, F1Fo Atp Synthase, F1-Atpase, Alpha3Beta3 Subcomplex Of F1-Atpase, Hydrolase (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   Y. Shirakihara, A. G. Leslie, J. P. Abrahams, J. E. Walker, T. Ueda, Y. Sekimoto, M. Kambara, K. Saika, Y. Kagawa, M. Yoshida
The Crystal Structure Of The Nucleotide-Free Alpha 3 Beta 3 Subcomplex Of F1-Atpase From The Thermophilic Bacillus Ps3 Is A Symmetric Trimer.
Structure V. 5 825 1997
PubMed-ID: 9261073 | Reference-DOI: 10.1016/S0969-2126(97)00236-0
(for further references see the PDB file header)

Molecule 1 - F1-ATPASE
	Chains	:	B
	EC Number	:	3.6.1.34
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PKK ALPHA FOR ALPHA SUBUNIT, PUC118BETA FOR BETA SUBUNIT
	Expression System Strain	:	DK8
	Expression System Taxid	:	562
	Expression System Vector Type	:	BACTERIUM
	Organ	:	HEART
	Organism Scientific	:	BACILLUS SP.
	Organism Taxid	:	2334
	Strain	:	PS3
	Synonym	:	F1-ATP SYNTHASE

Molecule 2 - F1-ATPASE
	Chains	:	E
	EC Number	:	3.6.1.34
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PKK ALPHA FOR ALPHA SUBUNIT, PUC118BETA FOR BETA SUBUNIT
	Expression System Strain	:	DK8
	Expression System Taxid	:	562
	Expression System Vector Type	:	BACTERIUM
	Organ	:	HEART
	Organism Scientific	:	BACILLUS SP.
	Organism Taxid	:	2334
	Strain	:	PS3
	Synonym	:	F1-ATP SYNTHASE

		1	2
Asymmetric Unit	:	B	E
Biological Unit 1 (3x)	:	B	E

Summary Information (see also Sequences/Alignments below)

Asymmetric Unit (1, 2)

No.	Name	Count	Type	Full Name
1	SO4	2	Ligand/Ion	SULFATE ION

Biological Unit 1 (1, 6)

No.	Name	Count	Type	Full Name
1	SO4	6	Ligand/Ion	SULFATE ION

Asymmetric Unit (3, 3)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	ASP B:170 , GLN B:172 , THR B:173 , GLY B:174 , LYS B:175 , THR B:176	BINDING SITE FOR RESIDUE SO4 B 503
2	AC2	SOFTWARE	GLY E:159 , ALA E:160 , GLY E:161 , VAL E:162 , GLY E:163 , LYS E:164 , THR E:165	BINDING SITE FOR RESIDUE SO4 E 474
3	CAT	UNKNOWN	GLU E:190	THE CARBOXYLATE GROUP OF THE GLUTAMIC ACID RESIDUE IS BELIEVED TO ACTIVATE A WATER MOLECULE FOR INLINE ATTACK ON THE GAMMA PHOSPHATE DURING ATP HYDROLYSIS. THE ARGININE RESIDUE (WHICH IS LOCATED ON AN ADJACENT ALPHA SUBUNIT) COULD HELP TO STABILIZE THE NEGATIVE CHARGE THAT DEVELOPS ON THE TERMINAL PHOSPHATE IN THE PUTATIVE PENTACOORDINATED TRANSITION STATE.

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

Asymmetric Unit

No.	Residues
1	Arg B:354	-	Pro B:355
2	Tyr E:341	-	Pro E:342

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

Asymmetric Unit (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	ATPASE_ALPHA_BETA	PS00152	ATP synthase alpha and beta subunits signature.	ATPB_BACP3	342-351	1	E:342-351
1	ATPASE_ALPHA_BETA	PS00152	ATP synthase alpha and beta subunits signature.	ATPA_BACP3	355-364	1	B:355-364

Biological Unit 1 (1, 6)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	ATPASE_ALPHA_BETA	PS00152	ATP synthase alpha and beta subunits signature.	ATPB_BACP3	342-351	3	E:342-351
1	ATPASE_ALPHA_BETA	PS00152	ATP synthase alpha and beta subunits signature.	ATPA_BACP3	355-364	3	B:355-364

(no "Exon" information available for 1SKY)

Asymmetric 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 B from PDB  Type:PROTEIN  Length:479
 aligned with ATPA_BACP3 | P09219 from UniProtKB/Swiss-Prot  Length:502

    Alignment length:482
                                    30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       420       430       440       450       460       470       480       490       500  
           ATPA_BACP3    21 SQIQVSDVGTVIQVGDGIARAHGLDNVMSGEAVEFANAVMGMALNLEENNVGIVILGPYTGIKEGDEVRRTGRIMEVPVGETLIGRVVNPLGQPVDGLGPVETTETRPIESRAPGVMDRRSVHEPLQTGIKAIDALVPIGRGQRELIIGDRQTGKTSVAIDTIINQKDQNMICIYVAIGQKESTVATVVETLAKHGAPDYTIVVTASASQPAPLLFLAPYAGVAMGEYFMIMGKHVLVVIDDLSKQAAAYRQLSLLLRRPPGREAYPGDIFYLHSRLLERAAKLSDAKGGGSLTALPFVETQAGDISAYIPTNVISITDGQIFLQSDLFFSGVRPAINAGLSVSRVGGAAQIKAMKKVAGTLRLDLAAYRELEAFAQFGSDLDKATQANVARGARTVEVLKQDLHQPIPVEKQVLIIYALTRGFLDDIPVEDVRRFEKEFYLWLDQNGQHLLEHIRTTKDLPNEDDLNQAIEAFKKTFVVSQ 502
               SCOP domains d1skyb2 B:21-95 F1 ATP synthase alpha subunit, domain 1                    d1skyb3 B:96-371 Central domain of alpha subunit of F1 ATP synthase                                                                                                                                                                                                                 d1skyb1 B:372-502 F1 A TP s yn thase alpha subunit, domain 3                                                                        SCOP domains
               CATH domains ---1skyB01 B:24-93  [code=2.40.30.20, no name defined]                   1skyB02 B:94-371 P-loop containing nucleotide triphosphate hydrolases                                                                                                                                                                                                                 1skyB03 B:372-499  [co de=1 .2 0.150.20, no name defined]                                                                       --- CATH domains
               Pfam domains ---ATP-synt_ab_N-1skyB01 B:24-92                                        -------------------------------------------------------ATP-synt_ab-1skyB02 B:148-364                                                                                                                                                                                            -----------ATP-synt_ab_C-1sky B03  B: 376-479                                                                      ----------------------- Pfam domains
         Sec.struct. author ....hhheeeeeeee..eeeeee.......eeeee....eeeeeeee..eeeeee...........eeeeeeee.eee........eee................eee......................hhhhhh.........eeee.....hhhhhhhhhhhh.....eeeeeee...hhhhhhhhhhhhh......eeeeee.....hhhhhhhhhhhhhhhhhhhhh..eeeeeee.hhhhhhhhhhhhhhh.....hhh....hhhhhhhhhhh.....hhh...eeeeeeeee.hhh....hhhhhhh.....eeee.hhhhhhh....................hhhhhhhhhhhhhhhhhhhh.-....-..-.hhhhhhhhhhhhhhhhh.........hhhhhhhhhhhh........hhhhhhhhhhhhhhhhhhhhh.hhhhhhh....hhhhhhhhhhhhhhhhh... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ATPASE_ALP------------------------------------------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1sky B  21 SQIQVSDVGTVIQVGDGIARAHGLDNVMSGEAVEFANAVMGMALNLEENNVGIVILGPYTGIKEGDEVRRTGRIMEVPVGETLIGRVVNPLGQPVDGLGPVETTETRPIESRAPGVMDRRSVHEPLQTGIKAIDALVPIGRGQRELIIGDRQTGKTSVAIDTIINQKDQNMICIYVAIGQKESTVATVVETLAKHGAPDYTIVVTASASQPAPLLFLAPYAGVAMGEYFMIMGKHVLVVIDDLSKQAAAYRQLSLLLRRPPGREAYPGDIFYLHSRLLERAAKLSDAKGGGSLTALPFVETQAGDISAYIPTNVISITDGQIFLQSDLFFSGVRPAINAGLSVSRVGGAAQIKAMKKVAGTLRLDLAAYRELE-FAQF-SD-DKATQANVARGARTVEVLKQDLHQPIPVEKQVLIIYALTRGFLDDIPVEDVRRFEKEFYLWLDQNGQHLLEHIRTTKDLPNEDDLNQAIEAFKKTFVVSQ 502
                                    30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390  | |  400| |    410       420       430       440       450       460       470       480       490       500  
                                                                                                                                                                                                                                                                                                                                                                                                              393 |  | || |                                                                                                   
                                                                                                                                                                                                                                                                                                                                                                                                                395  | || |                                                                                                   
                                                                                                                                                                                                                                                                                                                                                                                                                   398 || |                                                                                                   
                                                                                                                                                                                                                                                                                                                                                                                                                     400| |                                                                                                   
                                                                                                                                                                                                                                                                                                                                                                                                                      401 |                                                                                                   
                                                                                                                                                                                                                                                                                                                                                                                                                        403

Chain E from PDB  Type:PROTEIN  Length:470
 aligned with ATPB_BACP3 | P07677 from UniProtKB/Swiss-Prot  Length:473

    Alignment length:470
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       420       430       440       450       460       470
           ATPB_BACP3     1 MTRGRVIQVMGPVVDVKFENGHLPAIYNALKIQHKARNENEVDIDLTLEVALHLGDDTVRTIAMASTDGLIRGMEVIDTGAPISVPVGQVTLGRVFNVLGEPIDLEGDIPADARRDPIHRPAPKFEELATEVEILETGIKVVDLLAPYIKGGKIGLFGGAGVGKTVLIQELIHNIAQEHGGISVFAGVGERTREGNDLYHEMKDSGVISKTAMVFGQMNEPPGARMRVALTGLTMAEYFRDEQGQDGLLFIDNIFRFTQAGSEVSALLGRMPSAIGYQPTLATEMGQLQERITSTAKGSITSIQAIYVPADDYTDPAPATTFSHLDATTNLERKLAEMGIYPAVDPLVSTSRALAPEIVGEEHYQVARKVQQTLERYKELQDIIAILGMDELSDEDKLVVHRARRIQFFLSQNFHVAEQFTGQPGSYVPVKETVRGFKEILEGKYDHLPEDRFRLVGRIEEVVEKAKAMG 470
               SCOP domains d1skye2 E:1-82 F1 ATP synthase beta subunit, domain 1                             d1skye3 E:83-356 Central domain of beta subunit of F1 ATP synthase                                                                                                                                                                                                                d1skye1 E:357-470 F1 ATP synthase beta subunit, domain 3                                                           SCOP domains
               CATH domains 1skyE01 E:1-82  [code=2.40.10.170, no name defined]                               -1skyE02 E:84-352 P-loop containing nucleotide triphosphate hydrolases                                                                                                                                                                                                        -1skyE03 E:354-469 Bovine Mitochondrial F1-atpase; Atp Synthase Beta Chain; Chain D, domain 3                        - CATH domains
               Pfam domains -----ATP-synt_ab_N-1skyE01 E:6-80                                               --------------------------------------------------------ATP-synt_ab-1skyE02 E:137-351                                                                                                                                                                                          ------------ATP-synt_ab_C-1skyE03 E:364-470                                                                             Pfam domains
         Sec.struct. author ..eeeeeeee..eeeeee..........eeeeee.........eeeeeeeeee....eeeeee...........eee......eee..hhh.......................eee.......hhh............hhhhhh.......eeeee......hhhhhhhhhhhhhhh....eeeeee...hhhhhhhhhhhhh..hhhheeeeee.....hhhhhhhhhhhhhhhhhhhhh...eeeeeee.hhhhhhhhhhhhhhh.....hhh....hhhhhhhhhhh.......eeeeeee...hhh....hhhhhhhhh..eeee....hhhh.................hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.......hhhhhhhhhhhhhhh........hhhh........hhhhhhhhhhhh........hhh.......hhhhhhh.... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ATPASE_ALP----------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1sky E   1 MTRGRVIQVMGPVVDVKFENGHLPAIYNALKIQHKARNENEVDIDLTLEVALHLGDDTVRTIAMASTDGLIRGMEVIDTGAPISVPVGQVTLGRVFNVLGEPIDLEGDIPADARRDPIHRPAPKFEELATEVEILETGIKVVDLLAPYIKGGKIGLFGGAGVGKTVLIQELIHNIAQEHGGISVFAGVGERTREGNDLYHEMKDSGVISKTAMVFGQMNEPPGARMRVALTGLTMAEYFRDEQGQDGLLFIDNIFRFTQAGSEVSALLGRMPSAIGYQPTLATEMGQLQERITSTAKGSITSIQAIYVPADDYTDPAPATTFSHLDATTNLERKLAEMGIYPAVDPLVSTSRALAPEIVGEEHYQVARKVQQTLERYKELQDIIAILGMDELSDEDKLVVHRARRIQFFLSQNFHVAEQFTGQPGSYVPVKETVRGFKEILEGKYDHLPEDRFRLVGRIEEVVEKAKAMG 470
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       420       430       440       450       460       470

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 Unit(hide GO term definitions)

Chain B (ATPA_BACP3 | P09219)

molecular function
	GO:0005524	ATP binding	Interacting selectively and non-covalently with ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0016787	hydrolase activity	Catalysis of the hydrolysis of various bonds, e.g. C-O, C-N, C-C, phosphoric anhydride bonds, etc. Hydrolase is the systematic name for any enzyme of EC class 3.
	GO:0016820	hydrolase activity, acting on acid anhydrides, catalyzing transmembrane movement of substances	Catalysis of the hydrolysis of an acid anhydride to directly drive the transport of a substance across a membrane.
	GO:0000166	nucleotide binding	Interacting selectively and non-covalently with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
	GO:0046933	proton-transporting ATP synthase activity, rotational mechanism	Catalysis of the transfer of protons from one side of a membrane to the other according to the reaction: ADP + H2O + phosphate + H+(in) = ATP + H+(out), by a rotational mechanism.
	GO:0046961	proton-transporting ATPase activity, rotational mechanism	Catalysis of the transfer of protons from one side of a membrane to the other according to the reaction: ATP + H2O + H+(in) = ADP + phosphate + H+(out), by a rotational mechanism.
biological process
	GO:0006754	ATP biosynthetic process	The chemical reactions and pathways resulting in the formation of ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0015991	ATP hydrolysis coupled proton transport	The transport of protons against an electrochemical gradient, using energy from ATP hydrolysis.
	GO:0046034	ATP metabolic process	The chemical reactions and pathways involving ATP, adenosine triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0015986	ATP synthesis coupled proton transport	The transport of protons across a membrane to generate an electrochemical gradient (proton-motive force) that powers ATP synthesis.
	GO:0006811	ion transport	The directed movement of charged atoms or small charged molecules into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0042777	plasma membrane ATP synthesis coupled proton transport	The transport of protons across the plasma membrane to generate an electrochemical gradient (proton-motive force) that powers ATP synthesis.
	GO:0015992	proton transport	The directed movement of protons (hydrogen ions) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0006810	transport	The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
cellular component
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005886	plasma membrane	The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
	GO:0045261	proton-transporting ATP synthase complex, catalytic core F(1)	The sector of a hydrogen-transporting ATP synthase complex in which the catalytic activity resides; it comprises the catalytic core and central stalk, and is peripherally associated with a membrane, such as the plasma membrane or the mitochondrial inner membrane, when the entire ATP synthase is assembled.
	GO:0033178	proton-transporting two-sector ATPase complex, catalytic domain	A protein complex that forms part of a proton-transporting two-sector ATPase complex and catalyzes ATP hydrolysis or synthesis. The catalytic domain (F1, V1, or A1) comprises a hexameric catalytic core and a central stalk, and is peripherally associated with the membrane when the two-sector ATPase is assembled.

Chain E (ATPB_BACP3 | P07677)

molecular function
	GO:0005524	ATP binding	Interacting selectively and non-covalently with ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0016787	hydrolase activity	Catalysis of the hydrolysis of various bonds, e.g. C-O, C-N, C-C, phosphoric anhydride bonds, etc. Hydrolase is the systematic name for any enzyme of EC class 3.
	GO:0016820	hydrolase activity, acting on acid anhydrides, catalyzing transmembrane movement of substances	Catalysis of the hydrolysis of an acid anhydride to directly drive the transport of a substance across a membrane.
	GO:0000166	nucleotide binding	Interacting selectively and non-covalently with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
	GO:0046933	proton-transporting ATP synthase activity, rotational mechanism	Catalysis of the transfer of protons from one side of a membrane to the other according to the reaction: ADP + H2O + phosphate + H+(in) = ATP + H+(out), by a rotational mechanism.
biological process
	GO:0006754	ATP biosynthetic process	The chemical reactions and pathways resulting in the formation of ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0015991	ATP hydrolysis coupled proton transport	The transport of protons against an electrochemical gradient, using energy from ATP hydrolysis.
	GO:0046034	ATP metabolic process	The chemical reactions and pathways involving ATP, adenosine triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0015986	ATP synthesis coupled proton transport	The transport of protons across a membrane to generate an electrochemical gradient (proton-motive force) that powers ATP synthesis.
	GO:0006811	ion transport	The directed movement of charged atoms or small charged molecules into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0042777	plasma membrane ATP synthesis coupled proton transport	The transport of protons across the plasma membrane to generate an electrochemical gradient (proton-motive force) that powers ATP synthesis.
	GO:0015992	proton transport	The directed movement of protons (hydrogen ions) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0006810	transport	The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
cellular component
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005886	plasma membrane	The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
	GO:0045261	proton-transporting ATP synthase complex, catalytic core F(1)	The sector of a hydrogen-transporting ATP synthase complex in which the catalytic activity resides; it comprises the catalytic core and central stalk, and is peripherally associated with a membrane, such as the plasma membrane or the mitochondrial inner membrane, when the entire ATP synthase is assembled.
	GO:0033178	proton-transporting two-sector ATPase complex, catalytic domain	A protein complex that forms part of a proton-transporting two-sector ATPase complex and catalyzes ATP hydrolysis or synthesis. The catalytic domain (F1, V1, or A1) comprises a hexameric catalytic core and a central stalk, and is peripherally associated with the membrane when the two-sector ATPase is assembled.

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(no "Entries Sharing at Least One Protein Chain" available for 1SKY)

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Ligands, Modified Residues, Ions (1, 2)

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