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1OBG

SAICAR-synthase complexed with ATP

Functional Information from GO Data
ChainGOidnamespacecontents
A0000166molecular_functionnucleotide binding
A0004639molecular_functionphosphoribosylaminoimidazolesuccinocarboxamide synthase activity
A0005515molecular_functionprotein binding
A0005524molecular_functionATP binding
A0005634cellular_componentnucleus
A0005737cellular_componentcytoplasm
A0006164biological_processpurine nucleotide biosynthetic process
A0006189biological_process'de novo' IMP biosynthetic process
A0009152biological_processpurine ribonucleotide biosynthetic process
A0016874molecular_functionligase activity
Functional Information from PDB Data
site_idAC1
Number of Residues6
DetailsBINDING SITE FOR RESIDUE SO4 A 308
ChainResidue
AARG122
ASER128
AARG242
AHOH2150
AHOH2269
AHOH2270

site_idAC2
Number of Residues4
DetailsBINDING SITE FOR RESIDUE MG A 310
ChainResidue
ATYR292
AASP239
AASP259
ALYS260

site_idAC3
Number of Residues5
DetailsBINDING SITE FOR RESIDUE SO4 A 311
ChainResidue
AGLY18
ALYS19
AVAL20
AARG21
AAMP307

site_idAC4
Number of Residues16
DetailsBINDING SITE FOR RESIDUE AMP A 307
ChainResidue
AARG21
AILE23
APHE33
AHIS75
AHIS110
ALYS111
AHIS112
ALEU114
ALYS164
AGLU219
AVAL232
AASP233
ASO4311
AHOH2264
AHOH2266
AHOH2267

site_idAC5
Number of Residues12
DetailsBINDING SITE FOR RESIDUE AMP A 309
ChainResidue
AGLU62
ALEU76
AVAL77
AILE79
AILE85
ASER106
ALEU107
ALEU108
AGLU253
AHOH2271
AHOH2272
AHOH2273

Functional Information from PROSITE/UniProt
site_idPS01057
Number of Residues15
DetailsSAICAR_SYNTHETASE_1 SAICAR synthetase signature 1. LIPLEvIVRgyiTGS
ChainResidueDetails
ALEU114-SER128

site_idPS01058
Number of Residues9
DetailsSAICAR_SYNTHETASE_2 SAICAR synthetase signature 2. IADtKFEFG
ChainResidueDetails
AILE213-GLY221

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues1
DetailsModified residue: {"description":"N-acetylserine","evidences":[{"source":"PubMed","id":"9551557","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"22814378","evidenceCode":"ECO:0007744"}]}
ChainResidueDetails

239149

PDB entries from 2025-07-23

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