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Title :   A VERY SHORT HYDROGEN BOND PROVIDES ONLY MODERATE STABILIZATION OF AN ENZYME: INHIBITOR COMPLEX OF CITRATE SYNTHASE

Authors :   K. C. Usher, S. J. Remington

Date :   07 Mar 94 (Deposition) - 30 Apr 94 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.70

Chains :   Asym. Unit : A
Biol. Unit 1: A  (2x)

Keywords :   Lyase(Oxo-Acid) (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   K. C. Usher, S. J. Remington, D. P. Martin, D. G. Drueckhammer
A Very Short Hydrogen Bond Provides Only Moderate Stabilization Of An Enzyme-Inhibitor Complex Of Citrate Synthase.
Biochemistry V. 33 7753 1994
PubMed-ID: 8011640 | Reference-DOI: 10.1021/BI00191A002
(for further references see the PDB file header)

Molecule 1 - CITRATE SYNTHASE
	Chains	:	A
	EC Number	:	4.1.3.7
	Engineered	:	YES
	Organism Common	:	CHICKEN
	Organism Scientific	:	GALLUS GALLUS
	Organism Taxid	:	9031

		1
Asymmetric Unit	:	A
Biological Unit 1 (2x)	:	A

Summary Information (see also Sequences/Alignments below)

Asymmetric Unit (2, 2)

No.	Name	Count	Type	Full Name
1	CMX	1	Ligand/Ion	CARBOXYMETHYLDETHIA COENZYME *A
2	OAA	1	Ligand/Ion	OXALOACETATE ION

Biological Unit 1 (2, 4)

No.	Name	Count	Type	Full Name
1	CMX	2	Ligand/Ion	CARBOXYMETHYLDETHIA COENZYME *A
2	OAA	2	Ligand/Ion	OXALOACETATE ION

Asymmetric Unit (4, 4)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	HIS A:238 , ASN A:242 , HIS A:274 , HIS A:320 , ARG A:329 , ARG A:401 , ARG A:421 , HOH A:584 , HOH A:586 , CMX A:700	BINDING SITE FOR RESIDUE OAA A 702
2	AC2	SOFTWARE	ARG A:46 , ARG A:164 , LEU A:273 , HIS A:274 , ALA A:277 , LEU A:309 , VAL A:314 , VAL A:315 , GLY A:317 , TYR A:318 , GLY A:319 , HIS A:320 , ALA A:321 , LYS A:366 , ALA A:367 , LYS A:368 , ASN A:373 , ASP A:375 , PHE A:397 , HOH A:539 , HOH A:547 , HOH A:585 , HOH A:603 , HOH A:623 , OAA A:702	BINDING SITE FOR RESIDUE CMX A 700
3	AMX	unknown	ARG A:46 , HIS A:274 , VAL A:315 , GLY A:317 , TYR A:318 , LYS A:366 , LYS A:368 , ASP A:375	NULL
4	OAA	unknown	HIS A:238 , HIS A:320 , ARG A:329 , ARG A:401	NULL

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

(no "Cis Peptide Bond" information available for 1CSI)

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

Asymmetric Unit (1, 1)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	CITRATE_SYNTHASE	PS00480	Citrate synthase signature.	CISY_CHICK	317-329	1	A:317-329

Biological Unit 1 (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	CITRATE_SYNTHASE	PS00480	Citrate synthase signature.	CISY_CHICK	317-329	2	A:317-329

(no "Exon" information available for 1CSI)

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)
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Chain A from PDB  Type:PROTEIN  Length:435
 aligned with CISY_CHICK | P23007 from UniProtKB/Swiss-Prot  Length:433

    Alignment length:435
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        433    
                                    12        22        32        42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       192       202       212       222       232       242       252       262       272       282       292       302       312       322       332       342       352       362       372       382       392       402       412       422       432|    
           CISY_CHICK     3 STNLKDVLAALIPKEQARIKTFRQQHGGTALGQITVDMSYGGMRGMKGLVYETSVLDPDEGIRFRGFSIPECQKLLPKGGXGGEPLPEGLFWLLVTGQIPTGAQVSWLSKEWAKRAALPSHVVTMLDNFPTNLHPMSQLSAAITALNSESNFARAYAEGILRTKYWEMVYESAMDLIAKLPCVAAKIYRNLYRAGSSIGAIDSKLDWSHNFTNMLGYTDAQFTELMRLYLTIHSDHEGGNVSAHTSHLVGSALSDPYLSFAAAMNGLAGPLHGLANQEVLGWLAQLQKAXXXAGADASLRDYIWNTLNSGRVVPGYGHAVLRKTDPRYTCQREFALKHLPGDPMFKLVAQLYKIVPNVLLEQGAAANPWPNVDAHSGVLLQYYGMTEMNYYTVLFGVSRALGVLAQLIWSRALGFPLERPKSMSTDGLIAL----   -
               SCOP domains d1csia_ A: Citrate synthase                                                                                                                                                                                                                                                                                                                                                                                                                         SCOP domains
               CATH domains 1csiA01 A:3-276,A:392-423 Citrate Synthase, domain 1                                                                                                                                                                                                                              1csiA02 A:277-391 Cytochrome P450-Terp, domain 2                                                                   1csiA01 A:3-276,A:392-423       -------------- CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..hhhhhhhhhhhhhhhhhhhhhhhh......hhhhhhhhh.............eee...eee.....hhhhhhhh.........hhhhhhhhhhhh...hhhhhhhhhhhhhhhh...hhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..........hhhhhhhhhhhhh...hhhhhhhhhhhhhh......hhhhhhhhhhh....hhhhhhhhhhhhhh....hhhhhhhhhhhhhhhhh.....hhhhhhhhhhhhhhhh..............hhhhhhhhhhhhhhh...hhhhhhhhhhhhhhhhhhhhh........hhhhhhhhhhhhh..hhhhhhhhhhhhhhhhhhhhhhhhhhh........hhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------CITRATE_SYNTH------------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1csi A   3 STNLKDVLASLIPKEQARIKTFRQQHGNTAVGQITVDMSYGGMRGMKGLIYETSVLDPDEGIRFRGFSIPECQKLLPKAGGGEEPLPEGLFWLLVTGQIPTPEQVSWVSKEWAKRAALPSHVVTMLDNFPTNLHPMSQLSAAITALNSESNFARAYAEGINRTKYWEFVYEDAMDLIAKLPCVAAKIYRNLYRAGSSIGAIDSKLDWSHNFTNMLGYTDPQFTELMRLYLTIHSDHEGGNVSAHTSHLVGSALSDPYLSFAAAMNGLAGPLHGLANQEVLLWLSQLQKDLGADASDEKLRDYIWNTLNSGRVVPGYGHAVLRKTDPRYTCQREFALKHLPSDPMFKLVAQLYKIVPNVLLEQGKAKNPWPNVDAHSGVLLQYYGMTEMNYYTVLFGVSRALGVLAQLIWSRALGFPLERPKSMSTAGLEKLSAGG 437
                                    12        22        32        42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       192       202       212       222       232       242       252       262       272       282       292       302       312       322       332       342       352       362       372       382       392       402       412       422       432

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

Classes(

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Folds(

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Superfamilies( (-)

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Families(

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Protein Domains( (-)

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Organisms( (-)

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Class: All alpha proteins (14657)

Fold: Citrate synthase (43)

Superfamily: Citrate synthase (43)

Family: Citrate synthase (38)

Protein domain: Citrate synthase (32)

Chicken (Gallus gallus) [TaxId: 9031] (14)

d1csia_

Asymmetric Unit

Classes(

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Architectures( (-)

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Topologies( (-)

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Homologous Superfamilies( (-)

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Organisms( (-)

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Class: Mainly Alpha (13335)

Architecture: Orthogonal Bundle (10391)

Topology: Citrate Synthase; domain 1 (32)

Homologous Superfamily: Citrate Synthase, domain 1 (32)

Chicken (Gallus gallus) (14)

1csiA01

A:3-276,A:392-423

Topology: Cytochrome p450-Terp; domain 2 (32)

Homologous Superfamily: Cytochrome P450-Terp, domain 2 (32)

Chicken (Gallus gallus) (14)

1csiA02

A:277-391

(no "Pfam Domain" information available for 1CSI)

Asymmetric Unit(hide GO term definitions)

Chain A (CISY_CHICK | P23007)

molecular function
	GO:0004108	citrate (Si)-synthase activity	Catalysis of the reaction: acetyl-CoA + H2O + oxaloacetate = citrate + CoA, where the acetyl group is added to the si-face of oxaloacetate; acetyl-CoA thus provides the two carbon atoms of the pro-S carboxymethyl group.
	GO:0036440	citrate synthase activity	Catalysis of the reaction: acetyl-CoA + H2O + oxaloacetate = citrate + CoA.
	GO:0016740	transferase activity	Catalysis of the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor). Transferase is the systematic name for any enzyme of EC class 2.
	GO:0046912	transferase activity, transferring acyl groups, acyl groups converted into alkyl on transfer	Catalysis of the transfer of an acyl group from one compound (donor) to another (acceptor), with the acyl group being converted into alkyl on transfer.
biological process
	GO:0005975	carbohydrate metabolic process	The chemical reactions and pathways involving carbohydrates, any of a group of organic compounds based of the general formula Cx(H2O)y. Includes the formation of carbohydrate derivatives by the addition of a carbohydrate residue to another molecule.
	GO:0006101	citrate metabolic process	The chemical reactions and pathways involving citrate, 2-hydroxy-1,2,3-propanetricarboyxlate. Citrate is widely distributed in nature and is an important intermediate in the TCA cycle and the glyoxylate 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:0005759	mitochondrial matrix	The gel-like material, with considerable fine structure, that lies in the matrix space, or lumen, of a mitochondrion. It contains the enzymes of the tricarboxylic acid cycle and, in some organisms, the enzymes concerned with fatty acid oxidation.
	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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