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. 1968 Oct;96(4):1291–1297. doi: 10.1128/jb.96.4.1291-1297.1968

Synthesis of 7-Oxo-8-Aminopelargonic Acid, a Biotin Vitamer, in Cell-free Extracts of Escherichia coli Biotin Auxotrophs1

M A Eisenberg a, C Star a
PMCID: PMC252447  PMID: 4879561

Abstract

The enzymatic synthesis of 7-oxo-8-aminopelargonic acid (7-KAP) from pimelyl-coenzyme A and l-alanine was demonstrated in cell-free extracts of a biotin mutant of Escherichia coli K-12 which excretes only 7-KAP into the growth medium. This biotin vitamer was identified by its chromatographic and electrophoretic properties. The enzyme (7-KAP synthetase) was repressed when the organism was grown in biotin concentrations greater than 0.2 ng/ml. The parent strain and members of other mutant groups that excrete 7-KAP, in addition to other vitamers, also exhibited synthetase activity. A mutant group that failed to excrete 7-KAP was further sub-divided into three groups, one of which lacked synthetase activity. These results are discussed in relation to a previously proposed scheme for biotin biosynthesis in which the formation of 7-KAP is considered the point of entry for pimelic acid into the biotin pathway.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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