Annotations: 4S38

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	GcpE N-terminal domain-like	8053955	3002254	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Nitrite and sulphite reductase 4Fe-4S domain-like	8053960	3000646	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	GcpE_C	e4s38A2	A: a+b three layers	X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 (From Topology)	H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 (From Topology)	T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4	F: GcpE_C	ECOD (1.6)
A	GcpE_N	e4s38A1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: GcpE_N	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.20.20.20	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Dihydropteroate synthase-like	CATH (4.3.0)
A	3.30.413.10	Alpha Beta	2-Layer Sandwich	Sulfite Reductase Hemoprotein	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF04551	GcpE protein (GcpE)	GcpE protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase	oxidoreductase activity, acting on CH or CH2 groups, with an iron-sulfur protein as acceptor oxidoreductase activity oxidoreductase activity, acting on CH or CH2 groups 4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase activity (ferredoxin) catalytic activity iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding 4-hydroxy-3-methylbut-2-enyl-diphosphate synthase activity (flavodoxin) cation binding transition metal ion binding iron ion binding oxidoreductase activity, acting on CH or CH2 groups, with an iron-sulfur protein as acceptor oxidoreductase activity oxidoreductase activity, acting on CH or CH2 groups 4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase activity (ferredoxin) catalytic activity iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding 4-hydroxy-3-methylbut-2-enyl-diphosphate synthase activity (flavodoxin) cation binding transition metal ion binding iron ion binding ion binding metal ion binding	cellular biosynthetic process isopentenyl diphosphate biosynthetic process lipid biosynthetic process carbohydrate derivative metabolic process glyceraldehyde-3-phosphate metabolic process phospholipid metabolic process cellular aldehyde metabolic process phosphate-containing compound metabolic process phosphorus metabolic process isoprenoid biosynthetic process isopentenyl diphosphate biosynthetic process, methylerythritol 4-phosphate pathway cellular metabolic process primary metabolic process phospholipid biosynthetic process cellular biosynthetic process isopentenyl diphosphate biosynthetic process lipid biosynthetic process carbohydrate derivative metabolic process glyceraldehyde-3-phosphate metabolic process phospholipid metabolic process cellular aldehyde metabolic process phosphate-containing compound metabolic process phosphorus metabolic process isoprenoid biosynthetic process isopentenyl diphosphate biosynthetic process, methylerythritol 4-phosphate pathway cellular metabolic process primary metabolic process phospholipid biosynthetic process biosynthetic process organophosphate metabolic process organophosphate biosynthetic process cellular lipid metabolic process metabolic process cellular process lipid metabolic process isoprenoid metabolic process isopentenyl diphosphate metabolic process terpenoid biosynthetic process terpenoid metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR016425	4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase, bacterial	Family
A	IPR011005	Dihydropteroate synthase-like superfamily	Homologous Superfamily
A	IPR045854	Nitrite and sulphite reductase 4Fe-4S domain-like superfamily	Homologous Superfamily
A	IPR004588	4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase, bacterial-type	Family

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase (IspG) M-CSA #991	4-hydroxy-3-methylbut-2-en-1-yl diphosphate (HMBPP) synthase is part of a non-mevalonate biosynthesis terpene pathway called the MEP pathway. This is an essential pathway for isoprenoid biosynthesis in many human pathogens while also being absent in humans and therefore is of interest for drug development. Specifically it converts 2-C-methyl-D-erythritol 2,4-cyclic diphosphate (MEcPP) to HMBPP by reductive dehydroxylation.	Defined by 1 residue: GLU:A-232 \| Explore in 3D: M-CSA Motif Definition At least 2 residues must be present to support Structure Motif searching. EC: 1.17.7.1 (PDB Primary Data) EC: 1.17.7.3 (UniProt)

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.