Protein
HMP-PP phosphatase
Organism
Escherichia coli (strain K12)
Function
Catalyzes the hydrolysis of 4-amino-2-methyl-5-hydroxymethylpyrimidine pyrophosphate (HMP-PP) to 4-amino-2-methyl-5-hydroxymethylpyrimidine phosphate (HMP-P). Can also hydrolyze other substrates such as MeO-HMP-PP and 4-amino-2-trifluoromethyl 5-hydroxymethylpyrimidine pyrophosphate (CF3-HMP-PP) to give MeO-HMP-P and 4-amino-2-trifluoromethyl-5-hydroxymethylpyrimidine phosphate. This hydrolysis generates resistance to the antibiotics (bacimethrin, CF3-HMP) by reducing the formation of their toxic forms, 2'-methoxythiamin pyrophosphate (MeO-TPP) and CF3-HMP-PP. Also hydrolyzes pyridoxal-phosphate (PLP) and flavin mononucleotide (FMN), and purines (GMP and IMP) as secondary substrates.
Similarity
Belongs to the HAD-like hydrolase superfamily. Cof family.
Sequence
MARLAAFDMDGTLLMPDHHLGEKTLSTLARLRERDITLTFATGRHALEMQHILGALSLDAYLITGNGTRVHSLEGELLHRDDLPADVAELVLYQQWDTRASMHIFNDDGWFTGKEIPALLQAFVYSGFRYQIIDVKKMPLGSVTKICFCGDHDDLTRLQIQLYEALGERAHLCFSATDCLEVLPVGCNKGAALTVLTQHLGLSLRDCMAFGDAMNDREMLVSVGSGFIMGNAMPQLRAELPHLPVIGHCRNQAVSHYLTHWLDYPHLPYSPE