Hydroxyethylthiazole kinase (EC 2.7.1.50) is an enzyme that catalyzes the chemical reaction
The enzyme characterised from baker's yeast converts 4-methyl-5-thiazoleethanol to 4-methyl-5-hydroxyethylthiazole phosphate by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine diphosphate (ADP). This reaction is a step in the biosynthesis of thiamine (vitamin B1), together with that catalysed by hydroxymethylpyrimidine kinase. Hydroxyethylthiazole kinase expression is regulated at the mRNA level by intracellular thiamin pyrophosphate. Thiamine pyrophosphate, a required cofactor for many enzymes in the cell, is synthesised de novo in Salmonella typhimurium.
This enzyme is a transferase, specifically one transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:4-methyl-5-(2-hydroxyethyl)thiazole 2-phosphotransferase. Other names in common use include hydroxyethylthiazole kinase (phosphorylating), and 4-methyl-5-(beta-hydroxyethyl)thiazole kinase.
Structural studies As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1C3Q, PDB: 1EKK, PDB: 1EKQ, PDB: 1ESJ, PDB: 1ESQ, and PDB: 1V8A.
References
External links Hydroxyethyl Cellulose





