Journal of the Chemical Society. Perkin transactions I p. 2963 - 2966 (1990)
Update date:2022-08-03
Topics:
Baxter, Robert L.
Hanley, A. Bryan
Chan, Henry W. S.
The putative role of 4-hydroxy-5-hydroxymethyl-2-methylpyrimidine 2 as a late precursor in the biosynthesis of thiamine 1 by Saccharomyces cerevisiae has been examined using the deuteriated derivative 2a.To enable measurement of deuterium incorporation into the pyrimidine ring fragment of 1, a procedure for the degradation of 1 to the aniline derivative 6 using thiaminase I from Bacillus thiaminolyticus has been developed.While 4-amino-2-methyl-5-hydroxy<2H1>methylpyrimidine 3a was incorporated into thiamine, deuterium from hydroxy-pyrimidine 2a was not incorporated to any significant extent, indicating that amination of compound 2 is not a late step in the biosynthesis of the pyrimidine ring.
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