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J. Bacteriol., 04 1996, 2445-2449, Vol 178, No. 8
Copyright © 1996, American Society for Microbiology

Isolation of a pdxJ point mutation that bypasses the requirement for the PdxH oxidase in pyridoxal 5' -phosphate coenzyme biosynthesis in Escherichia coli K-12

TK Man, G Zhao and ME Winkler
Department of Microbiology and Molecular Genetics, University of Texas Houston Medical School 77030-1501, USA.

We isolated 26 suppressor mutations that allowed growth of a delta pdxH::omega null mutant in the absence of pyridoxal. Each suppressor mapped to pdxJ, and the eight suppressors sequenced contained the same glycine-to-serine change in the PdxJ polypeptide. This bypass suppression suggests that PdxJ may participate in formation of the pyridine ring of pyridoxine 5'-phosphate.


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