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Breeding of High Daptomycin-Producing Strain by Streptomycin Resistance Superposition Cover

Breeding of High Daptomycin-Producing Strain by Streptomycin Resistance Superposition

Open Access
|Sep 2022

Abstract

Daptomycin is a cyclolipopeptide antibiotic produced by Streptomyces roseosporus. It is widely used to treat drug-resistant bacterial infections; however, daptomycin yield in wild strains is very low. To improve the daptomycin production by the strain BNCC 342432, a modified method of ribosome engineering with superposition of streptomycin resistance was adopted in this study. The highest-yield mutant strain SR-2620 was obtained by increasing streptomycin resistance of BNCC 342432, and achieved daptomycin production of 38.5 mg/l in shake-flask fermentation, 1.79-fold higher than the parent strain and its heredity stability was stable. The morphological characteristics of the two strains were significantly different, and the 440th base G of the rpsL gene in the mutant strain was deleted, which resulted in a frameshift mutation. Our results demonstrate that gradually increasing strain resistance to streptomycin was an effective breeding method to improve daptomycin yield in S. roseosporus.

DOI: https://doi.org/10.33073/pjm-2022-041 | Journal eISSN: 2544-4646 | Journal ISSN: 1733-1331
Language: English
Page range: 463 - 471
Submitted on: May 5, 2022
Accepted on: Aug 2, 2022
Published on: Sep 24, 2022
Published by: Polish Society of Microbiologists
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2022 Shuaibei Chu, Wenting Hu, Kaihong Zhang, Fengli Hui, published by Polish Society of Microbiologists
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.