Hydroxymethylpyrimidine/phosphomethylpyrimidine kinase THI20

UniProtKB accession:  Q08224

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UniProtKB description:  Trifunctional protein with both thiamine biosynthetic and degradative activity (PubMed:15967475). Within the thiamine biosynthesis pathway, catalyzes the phosphorylation of hydroxymethylpyrimidine (HMP) to hydroxymethylpyrimidine phosphate (HMP-P), as well as of HMP-P to HMP-PP (PubMed:10383756, PubMed:15967475). Has also thiaminase II activity and degrades thiamine using water as the nucleophile, resulting only in the formation of HMP (4-amino-2-methyl-5-hydroxymethylpyrimidine) and Thz (4-methyl-5-thiazole ethanol) (PubMed:15967475).