Jump to content

Dihydropteroate synthase

From Wikipedia, the free encyclopedia
Dihydropteroate synthetase
Tetrahydrofolate synthesis pathway
Identifiers
EC no.2.5.1.15
CAS no.9055-61-2
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
Search
PMCarticles
PubMedarticles
NCBIproteins
Pterin binding enzyme
Identifiers
SymbolPterin_bind
PfamPF00809
InterProIPR000489
PROSITEPDOC00630
SCOP21ajz / SCOPe / SUPFAM
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
PDB1twzA:28-230 1twsA:28-230 1twwB:28-230

1tx0A:28-230 1tx2A:28-230 1ad1B:9-210 1ad4A:9-210 1eyeA:11-220 1ajz :20-228 1aj2 :20-228 1aj0 :20-228 2bmbA:509-774 1q8aB:315-515 1q7zB:315-515 1q85A:315-515 1q8jA:315-515 1q7qB:315-515 1q7mA:315-515

1f6yA:1-206

Dihydropteroate synthase (DHPS) is an enzyme classified under EC 2.5.1.15. It produces dihydropteroate in bacteria, but it is not expressed in most eukaryotes including humans. This makes it a useful target for sulfonamide antibiotics, which compete with the PABA precursor.

All organisms require reduced folate cofactors for the synthesis of a variety of metabolites. Most microorganisms must synthesize folate de novo because they lack the active transport system of higher vertebrate cells that allows these organisms to use dietary folates. Proteins containing this domain include dihydropteroate synthase (EC 2.5.1.15) as well as a group of methyltransferase enzymes including methyltetrahydrofolate, corrinoid iron-sulphur protein methyltransferase (MeTr)[1] that catalyses a key step in the Wood-Ljungdahl pathway of carbon dioxide fixation.

Dihydropteroate synthase (EC 2.5.1.15) (DHPS) catalyses the condensation of 6-hydroxymethyl-7,8-dihydropteridine pyrophosphate to para-aminobenzoic acid to form 7,8-dihydropteroate. This is the second step in the three-step pathway leading from 6-hydroxymethyl-7,8-dihydropterin to 7,8-dihydrofolate. DHPS is the target of sulfonamides, which are substrate analogues that compete with para-aminobenzoic acid. Bacterial DHPS (gene sul or folP)[2] is a protein of about 275 to 315 amino acid residues that is either chromosomally encoded or found on various antibiotic resistance plasmids. In the fungus Pneumocystis jirovecii (previously P. carinii) DHPS is the C-terminal domain of a multifunctional folate synthesis enzyme (gene fas).[3]

References

[edit]
  1. ^ Universal protein resource accession number Q46389 at UniProt.
  2. ^ Crawford IP, Slock J, Stahly DP, Six EW, Han CY (1990). "An apparent Bacillus subtilis folic acid biosynthetic operon containing pab, an amphibolic trpG gene, a third gene required for synthesis of para-aminobenzoic acid, and the dihydropteroate synthase gene". J. Bacteriol. 172 (12): 7211–7226. doi:10.1128/jb.172.12.7211-7226.1990. PMC 210846. PMID 2123867.
  3. ^ Volpe F, Dyer M, Scaife JG, Darby G, Stammers DK, Delves CJ (1992). "The multifunctional folic acid synthesis fas gene of Pneumocystis carinii appears to encode dihydropteroate synthase and hydroxymethyldihydropterin pyrophosphokinase". Gene. 112 (2): 213–218. doi:10.1016/0378-1119(92)90378-3. PMID 1313386.
[edit]
This article incorporates text from the public domain Pfam and InterPro: IPR000489