Pyridoxine, pyridoxal, and pyridoxamine kinase; Phosphorylates B6 vitamers; functions in a salvage pathway. Uses pyridoxal, pyridoxine, and pyridoxamine as substrates. Can also use hydroxymethylpyrimidine (HMP) as substrate. Belongs to the ThiD family.

Hydroxyethylthiazole kinase; Catalyzes the phosphorylation of the hydroxyl group of 4- methyl-5-beta-hydroxyethylthiazole (THZ).

Biosynthesis of the pyrimidine moiety from 5-aminoimidazole ribotide (AIR) (thiamin biosynthesis); Catalyzes the synthesis of the hydroxymethylpyrimidine phosphate (HMP-P) moiety of thiamine from aminoimidazole ribotide (AIR) in a radical S-adenosyl-L-methionine (SAM)-dependent reaction. Belongs to the ThiC family.

tRNA-Asp; Catalyzes the ATP-dependent phosphorylation of thiamine- monophosphate (TMP) to form thiamine-pyrophosphate (TPP), the active form of vitamin B1; Belongs to the thiamine-monophosphate kinase family.

Hydroxyethylthiazole phosphate synthetase (thiamine biosynthesis); Catalyzes the rearrangement of 1-deoxy-D-xylulose 5-phosphate (DXP) to produce the thiazole phosphate moiety of thiamine. Sulfur is provided by the thiocarboxylate moiety of the carrier protein ThiS. In vitro, sulfur can be provided by H(2)S.

Thiaminase II; Catalyzes an amino-pyrimidine hydrolysis reaction at the C5' of the pyrimidine moiety of thiamine compounds, a reaction that is part of a thiamine salvage pathway. Thus, catalyzes the conversion of 4- amino-5-aminomethyl-2-methylpyrimidine to 4-amino-5-hydroxymethyl-2- methylpyrimidine (HMP). To a lesser extent, is also able to catalyze the hydrolytic cleavage of thiamine; however, this thiaminase activity is unlikely to be physiologically relevant. Therefore, is involved in the regeneration of the thiamine pyrimidine from thiamine degraded products present in the enviro [...]

Adenylate transferase and sulfur transferase (thiamine biosynthesis); Catalyzes the adenylation by ATP of the carboxyl group of the C-terminal glycine of sulfur carrier protein ThiS; Belongs to the HesA/MoeB/ThiF family.

Thiazole tautomerase; Catalyzes the irreversible aromatization of 2-((2R,5Z)-2- carboxy-4-methylthiazol-5(2H)-ylidene)ethyl phosphate (cThz*-P) to 2- (2-carboxy-4-methylthiazol-5-yl)ethyl phosphate (cThz-P), a step in the biosynthesis of the thiazole phosphate moiety of thiamine. Cannot use cThz* as substrate, indicating that the phosphate group is essential. Has no thiamine phosphate synthase activity, despite a high sequence similarity with ThiE.

GTPase involved in ribosome and sacculus morphogenesis; One of several proteins that assist in the late maturation steps of the functional core of the 30S ribosomal subunit. Helps release RbfA from mature subunits. May play a role in the assembly of ribosomal proteins into the subunit. Circularly permuted GTPase with a low level of activity and slow catalytic turnover, does not act on ATP. GTPase activity is stimulated by the presence of 30S or 70S ribosomes, phosphorylation increases stimulation. Depletion results in increased sensitivity to protein synthesis inhibitors that block the [...]