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6U4I

Crystal Structure of Ketosteroid Isomerase from Pseudomonas Putida (pKSI) bound to Equilenin at 280 K

Functional Information from GO Data
ChainGOidnamespacecontents
A0004769molecular_functionsteroid Delta-isomerase activity
A0006629biological_processlipid metabolic process
A0008202biological_processsteroid metabolic process
A0016853molecular_functionisomerase activity
B0004769molecular_functionsteroid Delta-isomerase activity
B0006629biological_processlipid metabolic process
B0008202biological_processsteroid metabolic process
B0016853molecular_functionisomerase activity
Functional Information from PDB Data
site_idAC1
Number of Residues6
Detailsbinding site for residue EQU A 201
ChainResidue
ATYR16
AASP40
AASP103
AMET116
ATRP120
BASN93

site_idAC2
Number of Residues6
Detailsbinding site for residue CL A 202
ChainResidue
AHOH351
BTHR71
BHOH335
AGLY72
AARG75
AHOH327

site_idAC3
Number of Residues9
Detailsbinding site for residue EQU B 201
ChainResidue
AASN93
BTYR16
BASP40
BPHE86
BMET90
BLEU99
BASP103
BMET116
BTRP120

site_idAC4
Number of Residues4
Detailsbinding site for residue MG B 202
ChainResidue
BHOH303
BHOH325
BHOH341
BHOH382

site_idAC5
Number of Residues4
Detailsbinding site for residue CL B 203
ChainResidue
ATHR71
AHOH351
BGLY72
BARG75

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues2
DetailsActive site: {"description":"Proton donor"}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues2
DetailsActive site: {"description":"Proton acceptor"}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues2
DetailsBinding site: {"evidences":[{"source":"PubMed","id":"11007792","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

Catalytic Information from CSA
site_idMCSA1
Number of Residues4
DetailsM-CSA 349
ChainResidueDetails
ATYR16proton acceptor, proton donor
AASP40proton acceptor, proton donor
AASP100electrostatic stabiliser
AASP103electrostatic stabiliser

site_idMCSA2
Number of Residues4
DetailsM-CSA 349
ChainResidueDetails
BTYR16proton acceptor, proton donor
BASP40proton acceptor, proton donor
BASP100electrostatic stabiliser
BASP103electrostatic stabiliser

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PDB entries from 2026-01-14

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