Protein
Probable S-methyl-5'-thioinosine phosphorylase
Organism
Methanopyrus kandleri (strain AV19 / DSM 6324 / JCM 9639 / NBRC 100938)
Function
Catalyzes the reversible phosphorylation of S-methyl-5'-thioinosine (MTI) to hypoxanthine and 5-methylthioribose-1-phosphate. Involved in the breakdown of S-methyl-5'-thioadenosine (MTA), a major by-product of polyamine biosynthesis. Catabolism of (MTA) occurs via deamination to MTI and phosphorolysis to hypoxanthine.
Similarity
Belongs to the PNP/MTAP phosphorylase family. MTAP subfamily.
Sequence
MTEVGVIGGTGFQPGLPERRRTVFTPYGTVRVDITRVGDHRVYFINRHGKGHDLPPHRINYRAIVWAMRELGVKRILATNSVGVINSDEYEPGDIVLPVDFLDFTKRRPTTFYDEKVVHVDVTEPYCPELREALLKAADDLGYTVKEGAVYVATEGPRFETPAEIRAFRKLGGDIVGMTGFPEVVLARELEICYASVCLCTNYAAGIDDRRRTIDEVFELVEELRPKAVELIERCIEYIPPKRSCPCSQALEGAEV