Volume 121, Issue 2 pp. 147-152

Isolation and characterization of Tn917-generated bacitracin deficient mutants of Bacillus licheniformis

Blagajana Herzog-Velikonja

Corresponding Author

Blagajana Herzog-Velikonja

Institute of Biology, University of Ljubljana, Ljubljana, Slovenia

*Corresponding author. Tel: 386 061 265 585; Fax: 386 61 273 390.Search for more papers by this author
Zdravko Podlesek

Zdravko Podlesek

Department of Biology, Biotechnical Faculty, Večna pot 111, University of Ljubljana, 61000 Ljubljana, Slovenia

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Miklavž Grabnar

Miklavž Grabnar

Department of Biology, Biotechnical Faculty, Večna pot 111, University of Ljubljana, 61000 Ljubljana, Slovenia

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First published: August 1994
Citations: 6

Abstract

Abstract Two Tn917-generated bacitracin deficient mutants of Bacillus licheniformis were isolated. Southern blot analysis of chromosomal DNA extracted from both insertional mutants showed that Tn917 inserted in the vicinity of the gene coding for the enzyme BA2 of the bacitracin synthetase enzyme complex. Measurements of bacitracin synthetase activity in cell-free extracts and positive hybridization signals in the vicinity of the BA2 gene indicate that in both bacitracin deficient mutants Tn917 could be inserted in the BA1 gene or in segments involved in regulation. Thus, it could be possible that the genes for bacitracin synthetase are clustered in the B. licheniformis genome.

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