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4-Keto-5-amino-6-hydroxyhexanoic acid was isolated from Bacillus cereus 102804 fermentations and found to inhibit the growth of Gram-positive and Gram-negative bacteria, when grown in a chemically defined medium. The mechanism appeared to be the inhibition of delta-aminolevulinic acid dehydratase. The Ki value of 4-keto-5-amino-6-hydroxyhexanoic acid in an enzyme preparation of Propionibacterium shermanii was 0.72 microM. Similar test conditions with 4-keto-5-aminohexanoic acid resulted in Ki of 12.1 microM. In both cases competitive inhibition was found. The structure of 4-keto-5-amino-6-hydroxyhexanoic acid was determined.

Microbial production of vitamin B12 antimetabolites. IV. Isolation and identification of 4-keto-5-amino-6-hydroxyhexanoic acid.