2'-hydroxypyridoxol, a biosynthetic precursor of vitamins B(6) and B(1) in yeast.
In separate experiments cultures of the yeast Saccharomyces cerevisiae ATTC 7752 were grown in the presence of [5',5'-2H2]- or of [2',2',5',5'-2H4]-3-hydroxy-2,4,5-tri(hydroxymethyl)pyridine (i.e., 2'-hydroxypyridoxol). The 2H NMR spectra of the samples of pyridoxamine dihydrochloride and of thiamin chloride hydrochloride that were isolated from the two experiments showed the presence of deuterium at the corresponding sites. Entry of deuterium from the specifically 2H-labeled samples of 2'-hydroxypyridoxol into the predicted sites of pyridoxamine and of the pyrimidine unit of thiamin provides the first unequivocal evidence that, in yeast, 2'-hydroxypyridoxol is an intermediate on the route from a C5-sugar into vitamin B6, and adds to the evidence that pyridoxol serves as a precursor of the pyrimidine unit of thiamin, supplying the C5N unit, C-2',2,N-1,C-6,5,5' as an intact unit.
Zeidler
Johannes
J
Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1.
Ullah
Nisar
N
Gupta
Ram Nath
RN
Pauloski
Richard M
RM
Sayer
Brian G
BG
Spenser
Ian D
ID
D019906:Nuclear Magnetic Resonance, Biomolecular; D011736:Pyridoxine / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D013831:Thiamine / Q000096:biosynthesis*; D025101:Vitamin B 6 / Q000096:biosynthesis*
C459723:2'-hydroxypyridoxol; D025101:Vitamin B 6; D011736:Pyridoxine; D013831:Thiamine