(E)-4-Hydroxy-3-methyl-but-2-enyl pyrophosphate

 E)-4-Hydroxy-3-methyl-but-2-enyl pyrophosphate (HMBPP or HMB-PP) is an intermediate of the MEP pathway (non-mevalonate pathway) of isoprenoid biosynthesis.[1][2] The enzyme HMB-PP synthase (GcpE, IspG) catalyzes the conversion of 2-C-methyl-D-erythritol 2,4-cyclodiphosphate (MEcPP) into HMB-PP. HMB-PP is then converted further to isopentenyl pyrophosphate (IPP) and dimethylallyl pyrophosphate (DMAPP) by HMB-PP reductase (LytB, IspH).

(E)-4-Hydroxy-3-methyl-but-2-enyl pyrophosphate
Chemical structure of HMB-PP
Ball-and-stick model, shown here as a 3- ion
Names
IUPAC name
(E)-4-hydroxy-3-methylbut-2-enoxy-oxidophosphoryl phosphate
Other names
(E)-4-hydroxy-dimethylallyl pyrophosphate
HDMAPP
(E)-4-Hydroxy-3-methyl-but-2-enyl diphosphate
HMBDP
Identifiers
3D model (JSmol)
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ChEBI
  • CHEBI:15664 check
ChEMBL
  • ChEMBL145233 check
ChemSpider
  • 4445244 check
PubChem CID
  • 21597501
Properties
Chemical formula
C5H12O8P2
Molar mass262.091 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

HMB-PP is an essential metabolite in most pathogenic bacteria including Mycobacterium tuberculosis as well as in malaria parasites, but is absent from the human host.[3]

HMB-PP is the physiological activator ("phosphoantigen") for human Vγ9/Vδ2 T cells, the major γδ T cell population in peripheral blood. With a bioactivity of 0.1 nM it is 10,000-10,000,000 times more potent than any other natural compound, such as IPP or alkyl amines. HMB-PP functions in this capacity by binding the B30.2 domain of BTN3A1.[4]



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 Metasyntactic variable, which is released under the 
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