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. 1989 Dec;171(12):6539–6548. doi: 10.1128/jb.171.12.6539-6548.1989

Biochemical and genetic analyses of acetoin catabolism in Alcaligenes eutrophus.

C Fründ 1, H Priefert 1, A Steinbüchel 1, H G Schlegel 1
PMCID: PMC210545  PMID: 2556366

Abstract

In genetic studies on the catabolism of acetoin in Alcaligenes eutrophus, we used Tn5::mob-induced mutants which were impaired in the utilization of acetoin as the sole carbon source for growth. The transposon-harboring EcoRI restriction fragments from 17 acetoin-negative and slow-growing mutants (class 2a) and from six pleiotropic mutants of A. eutorphus, which were acetoin-negative and did not grow chemolithoautotrophically (class 2b), were cloned from pHC79 gene banks. The insertions of Tn5 were mapped on four different chromosomal EcoRI restriction fragments (A, C, D, and E) in class 2a mutants. The native DNA fragments were cloned from a lambda L47 or from a cosmid gene bank. Evidence is provided that fragments A (21 kilobase pairs [kb]) and C (7.7 kb) are closely linked in the genome; the insertions of Tn5 covered a region of approximately 5 kb. Physiological experiments revealed that this region encodes for acetoin:dichlorophenol-indophenol oxidoreductase, a fast-migrating protein, and probably for one additional protein that is as yet unknown. In mutants which were not completely impaired in growth on acetoin but which grew much slower and after a prolonged lag phase, fragments D (7.2 kb) and E (8.1 kb) were inactivated by insertion of Tn5::mob. No structural gene could be assigned to the D or E fragments. In class 2b mutants, insertions of Tn5 were mapped on fragment B (11.3 kb). This fragment complemented pleiotropic hno mutants in trans; these mutants were impaired in the formation of a rpoN-like protein. The expression of the gene cluster on fragments A and C seemed to be rpoN dependent.

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Selected References

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