NCBI Accession #
NP_200288.1
NCBI GenBank Nucleotide #
NM_124858.4
NCBI Official Full Name
thiazole biosynthetic enzyme, chloroplast (ARA6) (THI1) (THI4)
NCBI Official Symbol
THI1
NCBI Official Synonym Symbols
MBG8.3; MBG8_3; THI1 PROTEIN; THI4; THIAMINE4; THIAZOLE REQUIRING; TZ
NCBI Protein Information
thiazole biosynthetic enzyme, chloroplast (ARA6) (THI1) (THI4)
NCBI Summary
Encodes a thiamine biosynthetic gene that has a dual function in thiamine biosynthesis and mitochondrial DNA damage tolerance. It appears to be involved in producing the thiazole portion of thiamine (vitamin B1). A crystal structure of the protein reveals that it forms a 2-ring homo-octamer.
UniProt Protein Name
Thiamine thiazole synthase, chloroplastic
UniProt Synonym Protein Names
Thiazole biosynthetic enzyme
UniProt Primary Accession #
Q38814
UniProt Related Accession #
Q38814
UniProt Comments
Involved in biosynthesis of the thiamine precursor thiazole. Catalyzes the conversion of NAD and glycine to adenosine diphosphate 5-(2-hydroxyethyl)-4-methylthiazole-2-carboxylic acid (ADT), an adenylated thiazole intermediate. The reaction includes an iron-dependent sulfide transfer from a conserved cysteine residue of the protein to a thiazole intermediate. The enzyme can only undergo a single turnover, which suggests it is a suicide enzyme. May have additional roles in adaptation to various stress conditions and in DNA damage tolerance. Acts as a positive regulator for the abscisic acid-induced activation of slow type anion channels during stomatal closure by repressing CPK33 kinase activity.