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2AAA

CALCIUM BINDING IN ALPHA-AMYLASES: AN X-RAY DIFFRACTION STUDY AT 2.1 ANGSTROMS RESOLUTION OF TWO ENZYMES FROM ASPERGILLUS

Functional Information from GO Data
ChainGOidnamespacecontents
A0004556molecular_functionalpha-amylase activity
A0005509molecular_functioncalcium ion binding
A0005576cellular_componentextracellular region
A0005975biological_processcarbohydrate metabolic process
A0016052biological_processcarbohydrate catabolic process
A0016787molecular_functionhydrolase activity
A0016798molecular_functionhydrolase activity, acting on glycosyl bonds
A0046872molecular_functionmetal ion binding
Functional Information from PDB Data
site_idAC1
Number of Residues7
DetailsBINDING SITE FOR RESIDUE CA A 485
ChainResidue
AASP121
AGLU162
AASP175
AGLU210
AHOH495
AHOH499
AHOH590

site_idAC2
Number of Residues7
DetailsBINDING SITE FOR RESIDUE CA A 486
ChainResidue
AHOH507
AHOH599
AHOH789
AHOH800
AHOH801
AASP206
AGLU230

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues1
DetailsActive site: {"description":"Nucleophile","evidences":[{"source":"PubMed","id":"2207069","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues1
DetailsActive site: {"description":"Proton donor","evidences":[{"source":"PubMed","id":"2207069","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues7
DetailsBinding site: {"evidences":[{"source":"UniProtKB","id":"P0C1B3","evidenceCode":"ECO:0000250"}]}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues6
DetailsBinding site: {"evidences":[{"source":"PubMed","id":"2207069","evidenceCode":"ECO:0000269"},{"source":"PDB","id":"2AAA","evidenceCode":"ECO:0007744"}]}
ChainResidueDetails

site_idSWS_FT_FI5
Number of Residues1
DetailsSite: {"description":"Transition state stabilizer","evidences":[{"source":"UniProtKB","id":"P0C1B3","evidenceCode":"ECO:0000250"}]}
ChainResidueDetails

site_idSWS_FT_FI6
Number of Residues3
DetailsGlycosylation: {"description":"N-linked (GlcNAc...) asparagine","evidences":[{"evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

Catalytic Information from CSA
site_idCSA1
Number of Residues5
DetailsAnnotated By Reference To The Literature 1amy
ChainResidueDetails
AARG204
AASP206
AHIS296
AASP297
AGLU230

site_idCSA2
Number of Residues2
DetailsAnnotated By Reference To The Literature 1amy
ChainResidueDetails
AASP206
ATYR260

site_idCSA3
Number of Residues4
DetailsAnnotated By Reference To The Literature 1amy
ChainResidueDetails
AHIS122
AASP206
AASP297
AGLU230

site_idCSA4
Number of Residues3
DetailsAnnotated By Reference To The Literature 1amy
ChainResidueDetails
AASP206
AASP297
AGLU230

site_idCSA5
Number of Residues2
DetailsAnnotated By Reference To The Literature 1amy
ChainResidueDetails
AASP206
AGLU230

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PDB entries from 2025-11-26

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