Abstract
Abstract The α-hydrazino analogue of histidine was found to be an effective inhibitor of the growth of Salmonella typhimurium wild type as well as Escherichia coli W and E. coli K-12. A mutant, hisP1650, which is resistant to the inhibitory action of the compound was isolated and found to be defective in the histidine-specific transport system. The hydrazino analogue reacts rapidly with pyridoxal phosphate in a nonenzymatic reaction to give a product which does not have the spectral properties expected of a hydrazone. The analogue inactivates several pyridoxal phosphate enzymes. Evidence is presented suggesting that the primary point of inhibition in the cell is the pyridoxal phosphate moiety of acetylornithine transaminase in the pathway of arginine biosynthesis.
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