Expression of Multiple Copies of the Lon Protease Gene Resulted in Increased Antibiotic Production, Osmotic and UV Stress Resistance in Streptomyces coelicolor A3(2).
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引用次数: 0
Abstract
The genus Streptomyces is a group of gram-positive bacteria that exhibit a distinctive growth pattern characterised by elongated, branched hyphae. Streptomyces coelicolor A3(2), which produces at least five different antibiotics, is a model organism that is widely used in genetic studies. There are very few studies in Streptomyces on the ATP-dependent Lon protease, which has very important functions in every organism and is particularly responsible for protein homeostasis. The aim of this study was to construct and characterize a recombinant S. coelicolor strain expressing the lon gene on a multicopy plasmid. For this purpose, the lon gene was first cloned in Escherichia coli under the control of the glycerol-inducible promoter of pSPG, and its expression in S. coelicolor A3(2) cells was demonstrated by RT-qPCR. In contrast with the initial hypothesis, increased lon expression did not affect cell growth seriously. Instead, it increased the cell's tolerance to osmotic and UV stress and led to a significant increase in antibiotic production. The recombinant strain produced 27 times more actinorhodin and 43 times more undecylprodigiosin than the wild-type strain after 120 h of fermentation. To our knowledge, this is the first study to demonstrate the effects of expression of the lon gene on a high copy number plasmid in Streptomyces.
期刊介绍:
Current Microbiology is a well-established journal that publishes articles in all aspects of microbial cells and the interactions between the microorganisms, their hosts and the environment.
Current Microbiology publishes original research articles, short communications, reviews and letters to the editor, spanning the following areas:
physiology, biochemistry, genetics, genomics, biotechnology, ecology, evolution, morphology, taxonomy, diagnostic methods, medical and clinical microbiology and immunology as applied to microorganisms.