2H31

Crystal structure of human PAICS, a bifunctional carboxylase and synthetase in purine biosynthesis

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	SAICAR_synt	e2h31A1	A: a+b complex topology	X: Protein kinase/SAICAR synthase/ATP-grasp (From Homology)	H: Protein kinase/SAICAR synthase/ATP-grasp	T: SAICAR synthase	F: SAICAR_synt	ECOD (1.6)
A	AIRC	e2h31A2	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: N5-CAIR mutase (phosphoribosylaminoimidazole carboxylase, PurE)	F: AIRC	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.1970	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01259	SAICAR synthetase (SAICAR_synt)	SAICAR synthetase	-	Family
A	PF00731	AIR carboxylase (AIRC)	AIR carboxylase	Members of this family catalyse the decarboxylation of 1-(5-phosphoribosyl)-5-amino-4-imidazole-carboxylate (AIR). This family catalyse the sixth step of de novo purine biosynthesis. Some members of this family contain two copies of this domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Multifunctional protein ADE2	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding cell adhesion molecule binding cadherin binding protein binding acid-amino acid ligase activity phosphoribosylaminoimidazolesuccinocarboxamide synthase activity catalytic activity ligase activity, forming carbon-nitrogen bonds ligase activity phosphoribosylaminoimidazole carboxylase activity carboxy-lyase activity lyase activity carbon-carbon lyase activity identical protein binding	ribose phosphate metabolic process IMP metabolic process purine ribonucleoside monophosphate biosynthetic process nucleotide biosynthetic process carbohydrate derivative metabolic process purine ribonucleotide biosynthetic process nucleobase-containing compound metabolic process ribonucleotide biosynthetic process purine nucleoside monophosphate biosynthetic process purine ribonucleoside monophosphate metabolic process purine nucleotide metabolic process ribonucleotide metabolic process ribonucleoside monophosphate metabolic process nucleobase-containing small molecule metabolic process purine-containing compound biosynthetic process ribose phosphate metabolic process IMP metabolic process purine ribonucleoside monophosphate biosynthetic process nucleotide biosynthetic process carbohydrate derivative metabolic process purine ribonucleotide biosynthetic process nucleobase-containing compound metabolic process ribonucleotide biosynthetic process purine nucleoside monophosphate biosynthetic process purine ribonucleoside monophosphate metabolic process purine nucleotide metabolic process ribonucleotide metabolic process ribonucleoside monophosphate metabolic process nucleobase-containing small molecule metabolic process purine-containing compound biosynthetic process purine nucleoside monophosphate metabolic process phosphate-containing compound metabolic process small molecule metabolic process phosphorus metabolic process ribose phosphate biosynthetic process nucleoside monophosphate metabolic process nucleoside phosphate metabolic process carbohydrate derivative biosynthetic process cellular metabolic process primary metabolic process nucleotide metabolic process nucleobase-containing compound biosynthetic process nucleoside monophosphate biosynthetic process purine-containing compound metabolic process IMP biosynthetic process biosynthetic process organophosphate metabolic process organophosphate biosynthetic process nucleoside phosphate biosynthetic process metabolic process cellular process 'de novo' IMP biosynthetic process purine ribonucleotide metabolic process ribonucleoside monophosphate biosynthetic process purine nucleotide biosynthetic process 'de novo' AMP biosynthetic process AMP metabolic process AMP biosynthetic process GMP metabolic process GMP biosynthetic process nucleobase biosynthetic process purine nucleobase metabolic process purine nucleobase biosynthetic process nucleobase metabolic process 'de novo' XMP biosynthetic process XMP metabolic process XMP biosynthetic process	membrane cellular anatomical entity extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle intracellular anatomical structure cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR028923	SAICAR synthetase/ADE2, N-terminal	Domain
A	IPR050089	SAICAR synthetase	Family
A	IPR000031	PurE domain	Domain
A	IPR018236	SAICAR synthetase, conserved site	Conserved Site
A	IPR033626	Class II PurE	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P22234	astrocytic tumor ductal breast carcinoma in situ large cell medulloblastoma lung carcinoma malignant ependymoma nasopharyngeal carcinoma ovarian cancer atypical teratoid rhabdoid tumor glioblastoma lung adenocarcinoma lymphoplasmacytic lymphoma medulloblastoma non-small cell lung carcinoma plasma cell myeloma breast cancer astrocytic tumor ductal breast carcinoma in situ large cell medulloblastoma lung carcinoma malignant ependymoma nasopharyngeal carcinoma ovarian cancer atypical teratoid rhabdoid tumor glioblastoma lung adenocarcinoma lymphoplasmacytic lymphoma medulloblastoma non-small cell lung carcinoma plasma cell myeloma breast cancer invasive ductal breast carcinoma lung cancer malignant colon neoplasm myopathy osteosarcoma

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.