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. Has broad substrate specificity with 6- aminopurine nucleosides as preferred substrates. Homotrimer. Ubiquitously expressed. Inhibited by 5'-methylthiotubercin and 5'- chloroformycin. Belongs to the PNP/MTAP phosphorylase family. MTAP subfamily. Note: This description may include information from UniProtKB.
Protein type: Amino Acid Metabolism - cysteine and methionine; Transferase; Phosphorylase; EC 18.104.22.168
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.