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Title :   ENZYME-SUBSTRATE INTERACTIONS: STRUCTURE OF HUMAN CARBONIC ANHYDRASE I COMPLEXED WITH BICARBONATE

Authors :   V. Kumar, K. K. Kannan

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

Method :   X-RAY DIFFRACTION

Resolution :   1.60

Chains :   Asym./Biol. Unit : A

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

Reference :   V. Kumar, K. K. Kannan
Enzyme-Substrate Interactions. Structure Of Human Carbonic Anhydrase I Complexed With Bicarbonate.
J. Mol. Biol. V. 241 226 1994
PubMed-ID: 8057362 | Reference-DOI: 10.1006/JMBI.1994.1491
(for further references see the PDB file header)

Molecule 1 - CARBONIC ANHYDRASE I
	Chains	:	A
	EC Number	:	4.2.1.1
	Engineered	:	YES
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606

		1
Asymmetric/Biological Unit	:	A

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (2, 2)

No.	Name	Count	Type	Full Name
1	BCT	1	Ligand/Ion	BICARBONATE ION
2	ZN	1	Ligand/Ion	ZINC ION

Asymmetric Unit (3, 3)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	HIS A:94 , HIS A:96 , HIS A:119 , HOH A:520 , HOH A:521 , BCT A:522	BINDING SITE FOR RESIDUE ZN A 261
2	AC2	SOFTWARE	HIS A:94 , HIS A:96 , HIS A:119 , LEU A:198 , THR A:199 , TRP A:209 , ZN A:261 , HOH A:361 , HOH A:520 , HOH A:521	BINDING SITE FOR RESIDUE BCT A 522
3	CAT	AUTHOR	HIS A:94 , HIS A:96 , HIS A:119 , ALA A:121 , VAL A:143 , LEU A:198 , THR A:199 , VAL A:207 , TRP A:209 , ZN A:261	CATALYTIC ACTIVE SITE OF THE ENZYME. SUBSTRATE BICARBONATE ANION BINDS IN THE POCKET DEFINED BY THESE RESIDUES AND IS A DONOR OF A H-BOND TO OG1 THR 199

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

Asymmetric/Biological Unit

No.	Residues
1	Ser A:29	-	Pro A:30
2	Pro A:201	-	Pro A:202

Asymmetric/Biological Unit (3, 3)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_001378	H	68	R	CAH1_HUMAN	Unclassified	---	A	H	67	R
2	UniProt	VAR_048679	A	143	V	CAH1_HUMAN	Polymorphism	7821248	A	A	142	V
3	UniProt	VAR_001379	G	254	R	CAH1_HUMAN	Polymorphism	121909577	A	G	253	R

SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

Asymmetric/Biological Unit (2, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	ALPHA_CA_2	PS51144	Alpha-carbonic anhydrases profile.	CAH1_HUMAN	4-261	1	A:3-260
2	ALPHA_CA_1	PS00162	Alpha-carbonic anhydrases signature.	CAH1_HUMAN	106-122	1	A:105-121

(no "Exon" information available for 1HCB)

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:258
 aligned with CAH1_HUMAN | P00915 from UniProtKB/Swiss-Prot  Length:261

    Alignment length:258
                                    13        23        33        43        53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213       223       233       243       253        
           CAH1_HUMAN     4 PDWGYDDKNGPEQWSKLYPIANGNNQSPVDIKTSETKHDTSLKPISVSYNPATAKEIINVGHSFHVNFEDNDNRSVLKGGPFSDSYRLFQFHFHWGSTNEHGSEHTVDGVKYSAELHVAHWNSAKYSSLAEAASKADGLAVIGVLMKVGEANPKLQKVLDALQAIKTKGKRAPFTNFDPSTLLPSSLDFWTYPGSLTHPPLYESVTWIICKESISVSSEQLAQFRSLLSNVEGDNAVPMQHNNRPTQPLKGRTVRASF 261
               SCOP domains d1hcba_ A: Carbonic anhydrase                                                                                                                                                                                                                                      SCOP domains
               CATH domains 1hcbA00 A:3-260 Carbonic Anhydrase II                                                                                                                                                                                                                              CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Pfam domains
         Sec.struct. author ..........hhhhhh..hhhh..............ee......eeee..hhheeeeee....eeeee.......eeee......eeeeeeeeee..................eeeeeeee.......hhhh......eeeeeeeeee....hhhhhhhhhhhhh.....eee.....hhhh......eeeeee..........eeeeee...eeehhhhhhhhh.............................ee.. Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------R--------------------------------------------------------------------------V--------------------------------------------------------------------------------------------------------------R------- SAPs(SNPs)
                PROSITE (1) ALPHA_CA_2  PDB: A:3-260 UniProt: 4-261                                                                                                                                                                                                                            PROSITE (1)
                PROSITE (2) ------------------------------------------------------------------------------------------------------ALPHA_CA_1       ------------------------------------------------------------------------------------------------------------------------------------------- PROSITE (2)
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Transcript
                 1hcb A   3 PDWGYDDKNGPEQWSKLYPIANGNNQSPVDIKTSETKHDTSLKPISVSYNPATAKEIINVGHSFHVNFEDNDNRSVLKGGPFSDSYRLFQFHFHWGSTNEHGSEHTVDGVKYSAELHVAHWNSAKYSSLAEAASKADGLAVIGVLMKVGEANPKLQKVLDALQAIKTKGKRAPFTNFDPSTLLPSSLDFWTYPGSLTHPPLYESVTWIICKESISVSSEQLAQFRSLLSNVEGDNAVPMQHNNRPTQPLKGRTVRASF 260
                                    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

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

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

Class: All beta proteins (24004)

Fold: Carbonic anhydrase (525)

Superfamily: Carbonic anhydrase (525)

Family: Carbonic anhydrase (513)

Protein domain: Carbonic anhydrase (499)

Human (Homo sapiens), erythrocytes, isozyme I [TaxId: 9606] (18)

d1hcba_

Asymmetric/Biological Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Alpha Beta (26913)

Architecture: Roll (3276)

Topology: Carbonic Anhydrase II (332)

Homologous Superfamily: Carbonic Anhydrase II (332)

Human (Homo sapiens) (309)

1hcbA00

A:3-260

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

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (CAH1_HUMAN | P00915)

molecular function
	GO:0004064	arylesterase activity	Catalysis of the reaction: a phenyl acetate + H2O = a phenol + acetate.
	GO:0004089	carbonate dehydratase activity	Catalysis of the reaction: H2CO3 = CO2 + H2O.
	GO:0016836	hydro-lyase activity	Catalysis of the cleavage of a carbon-oxygen bond by elimination of water.
	GO:0016829	lyase activity	Catalysis of the cleavage of C-C, C-O, C-N and other bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. They differ from other enzymes in that two substrates are involved in one reaction direction, but only one in the other direction. When acting on the single substrate, a molecule is eliminated and this generates either a new double bond or a new ring.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0005515	protein binding	Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
	GO:0008270	zinc ion binding	Interacting selectively and non-covalently with zinc (Zn) ions.
biological process
	GO:0015701	bicarbonate transport	The directed movement of bicarbonate into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0006730	one-carbon metabolic process	The chemical reactions and pathways involving the transfer of one-carbon units in various oxidation states.
cellular component
	GO:0005737	cytoplasm	All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
	GO:0005829	cytosol	The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
	GO:0070062	extracellular exosome	A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.

Asymmetric/Biological Unit
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