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Microbiology

, Volume 77, Issue 2, pp 176–180 | Cite as

Obtaining Pseudomonas aurantiaca strains capable of overproduction of phenazine antibiotics

  • I. N. Feklistova
  • N. P. Maksimova
Experimental Articles

Abstract

N-methyl-N′-nitro-N-nitrosoguanidine (NG)-induced mutagenesis with subsequent selection for resistance to toxic amino acid analogues (azaserine, m-fluoro-DL-phenylalanine, and 6-diazo-5-oxo-L-norleucine) was applied to Pseudomonas aurantiaca B-162. The resulting strains produced phenazine antibiotics three times more efficiently than the wild type strain and ten times more efficiently than the known pseudomonad strains. Overproduction of phenazine antibiotics was shown to result either from deregulation of 3-deoxy-D-arabinohepulosonate-7-phosphate synthase (DAHP synthase), the key enzyme of the aromatic pathway (removal of inhibition by phenylalanine, tyrosine, and phenazine), or overproduction of N-hexanoyl homoserine lactone, the regulatory molecules of positive control of cellular metabolism (QS systems).

Key words

Pseudomonas phenazine antibiotics producers mutants 

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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  1. 1.Belarus State University, MinskMinskBelarus

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