Diphosphomevalonate decarboxylase (IPR029765)

Short name: Mev_diP_decarb

Overlapping homologous superfamilies

Family relationships


This group of enzymes belongs to the GHMP kinase domain superfamily. GHMP kinases are a unique class of ATP-dependent enzymes (the abbreviation of which refers to the original members: galactokinase, homoserine kinase, mevalonate kinase, and phosphomevalonate kinase) [PMID: 8382990]. Enzymes belonging to this superfamily contain three well-conserved motifs, the second of which has the typical sequence Pro-X-X-X-Gly-Leu-X-Ser-Ser-Ala and is involved in ATP binding [PMID: 11188689]. The phosphate binding loop in GHMP kinases is distinct from the classical P-loops found in many ATP/GTP binding proteins. The bound ADP molecule adopts a rare syn conformation and is in the opposite orientation from those bound to the P-loop-containing proteins [PMID: 11188689]. GHMP kinases display a distinctly bilobal appearance with their N-terminal subdomains dominated by a mixed beta-sheet flanked on one side by alpha-helices and their C-terminal subdomains containing a four stranded anti-parallel beta-sheet [PMID: 12796487, PMID: 11188689, PMID: 12771135, PMID: 12001237].

Diphosphomevalonate decarboxylase (mevalonate pyrophosphate decarboxylase, (EC: catalyzes the decarboxylation of mevalonate pyrophosphate to isopentyl pyrophosphate (IPP) [PMID: 7947744], the last step in the synthesis of IPP in the mevalonate pathway. In archaea, an alternate pathway involves decarboxylation of mevalonate monophosphate instead of diphosphomevalonate [PMID: 24375100]. Mevalonate is a key intermediate in the biosynthesis of sterols and non-sterol isoprenes in the mevalonate pathway. In mammals, the majority of mevalonate is converted into cholesterol. ATP + (R)-5-diphosphomevalonate = ADP + phosphate + isopentenyl diphosphate + CO2

GO terms

Biological Process

GO:0019287 isopentenyl diphosphate biosynthetic process, mevalonate pathway

Molecular Function

GO:0004163 diphosphomevalonate decarboxylase activity

Cellular Component

GO:0005829 cytosol

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.