Protein
S-methyl-5'-thioadenosine phosphorylase
Organism
Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
Function
Catalyzes the reversible phosphorylation of S-methyl-5'-thioadenosine (MTA) to adenine and 5-methylthioribose-1-phosphate. Involved in the breakdown of MTA, a major by-product of polyamine biosynthesis. Responsible for the first step in the methionine salvage pathway after MTA has been generated from S-adenosylmethionine. Prefers MTA, with 2% activity on adenosine, 0.8% activity on S-adenosyl-L-homocysteine and no activity on other tested nucleosides.
Similarity
Belongs to the PNP/MTAP phosphorylase family. MTAP subfamily.
Sequence
MHNNGRMLGVIGGSGFYTFFGSDTRTVNSDTPYGQPSAPITIGTIGVHDVAFLPRHGAHHQYSAHAVPYRANMWALRALGVRRVFGPCAVGSLDPELEPGAVVVPDQLVDRTSGRADTYFDFGGVHAAFADPYCPTLRAAVTGLPGVVDGGTMVVIQGPRFSTRAESQWFAAAGCNLVNMTGYPEAVLARELELCYAAIALVTDVDAGVAAGDGVKAADVFAAFGENIELLKRLVRAAIDRVADERTCTHCQHHAGVPLPFELP