Affiliation:
1. Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111
Abstract
ABSTRACT
Bacillus subtilis
synthesizes pyridoxal 5′-phosphate, the active form of vitamin B
6
, by a poorly characterized pathway involving the
yaaD
and
yaaE
genes. The
pdxS
(
yaaD
) mutant was confirmed to be a strict B
6
auxotroph, but the
pdxT
(
yaaE
) mutant turned out to be a conditional auxotroph depending on the availability of ammonium in the growth medium. The PdxS and PdxT proteins copurified during affinity chromatography and apparently form a complex that has glutaminase activity. PdxS and PdxT appear to encode the synthase and glutaminase subunits, respectively, of a glutamine amidotransferase of as-yet-unknown specificity essential for B
6
biosynthesis.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
72 articles.
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