2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase

Summary

In enzymology, a 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase (EC 2.7.6.3) is an enzyme that catalyzes the chemical reaction

2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase
2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase monomer, E.Coli
Identifiers
EC no.2.7.6.3
CAS no.37278-23-2
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
Search
PMCarticles
PubMedarticles
NCBIproteins
7,8-dihydro-6-hydroxymethylpterin-pyrophosphokinase (HPPK)
7,8-dihydro-6-hydroxymethylpterin-pyrophosphokinase from haemophilus influenzae
Identifiers
SymbolHPPK
PfamPF01288
InterProIPR000550
PROSITEPDOC00631
SCOP21hka / SCOPe / SUPFAM
CDDcd00483
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
ATP + 2-amino-4-hydroxy-6-hydroxymethyl-7,8-dihydropteridine AMP + (2-amino-4-hydroxy-7,8-dihydropteridin-6-yl)methyl diphosphate

Thus, the two substrates of this enzyme are ATP and 2-amino-4-hydroxy-6-hydroxymethyl-7,8-dihydropteridine, whereas its two products are AMP and (2-amino-4-hydroxy-7,8-dihydropteridin-6-yl)methyl diphosphate.

This enzyme belongs to the family of transferases, specifically those transferring two phosphorus-containing groups (diphosphotransferases). The systematic name of this enzyme class is ATP:2-amino-4-hydroxy-6-hydroxymethyl-7,8-dihydropteridine 6'-diphosphotransferase. Other names in common use include 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinase, H2-pteridine-CH2OH pyrophosphokinase, 7,8-dihydroxymethylpterin-pyrophosphokinase, HPPK, 7,8-dihydro-6-hydroxymethylpterin pyrophosphokinase, and hydroxymethyldihydropteridine pyrophosphokinase. This enzyme participates in folate biosynthesis.

This enzyme catalyses the first step in a three-step pathway leading to 7,8 dihydrofolate. Bacterial HPPK (gene folK or sulD) is a protein of 160 to 270 amino acids.[1] In the lower eukaryote Pneumocystis carinii, HPPK is the central domain of a multifunctional folate synthesis enzyme (gene fas).[2]

Structural studies edit

As of late 2007, 23 structures have been solved for this class of enzymes, with PDB accession codes 1DY3, 1EQ0, 1EQM, 1EX8, 1F9H, 1F9Y, 1G4C, 1HKA, 1HQ2, 1IM6, 1KBR, 1Q0N, 1RAO, 1RB0, 1RTZ, 1RU1, 1RU2, 1TMJ, 1TMM, 2BMB, 2CG8, 2F63, and 2F65.

References edit

  1. ^ Talarico TL, Ray PH, Dev IK, Merrill BM, Dallas WS (September 1992). "Cloning, sequence analysis, and overexpression of Escherichia coli folK, the gene coding for 7,8-dihydro-6-hydroxymethylpterin-pyrophosphokinase". J. Bacteriol. 174 (18): 5971–7. doi:10.1128/jb.174.18.5971-5977.1992. PMC 207135. PMID 1325970.
  2. ^ Volpe F, Dyer M, Scaife JG, Darby G, Stammers DK, Delves CJ (March 1992). "The multifunctional folic acid synthesis fas gene of Pneumocystis carinii appears to encode dihydropteroate synthase and hydroxymethyldihydropterin pyrophosphokinase". Gene. 112 (2): 213–8. doi:10.1016/0378-1119(92)90378-3. PMID 1313386.

Further reading edit

  • Richey DP, Brown GM (1969). "The biosynthesis of folic acid. IX. Purification and properties of the enzymes required for the formation of dihydropteroic acid". J. Biol. Chem. 244 (6): 1582–92. PMID 4304228.
  • Richey DP, Brown GM (1971). "Hydroxymethyldihydropteridine pyrophosphokinase and dihydropteroate synthetase from Escherichia coli". Methods Enzymol. 18B: 765–771. doi:10.1016/s0076-6879(71)18150-5.
  • Shiota T, Baugh CM, Jackson R, Dillard R (1969). "The enzymatic synthesis of hydroxymethyldihydropteridine pyrophosphate and dihydrofolate". Biochemistry. 8 (12): 5022–8. doi:10.1021/bi00840a052. PMID 4312465.