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Differential protein expression of a streptomycin-resistant: Streptomyces albulus mutant in high yield production of ϵ-poly-l-lysine: A proteomics study

RSC Advances, ISSN: 2046-2069, Vol: 9, Issue: 42, Page: 24092-24104
2019
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ϵ-Poly-l-lysine (ϵ-PL), produced by Streptomyces albulus, is an excellent antimicrobial agent which has been extensively used in the field of food and medicine. In our previous study, we have improved ϵ-PL production by S. albulus M-Z18 through iterative introduction of streptomycin resistance. To decipher the overproduction mechanism of high-yielding mutant S. albulus SS-62, we conducted a comparative proteomics analysis between S. albulus SS-62 and its parent strain S. albulus M-Z18. Approximately 11.5% of the predicted S. albulus proteome was detected and 401 known or putative regulatory proteins showed statistically differential expression levels. Expression levels of proteins involved in ϵ-PL precursor metabolism and energy metabolism, and proteins in the pathways related to transcriptional regulation and translation were up-regulated. It was indicated that mutant SS-62 could not only strengthen the ϵ-PL precursor metabolism and energy metabolism but also tune the pathways related to transcriptional regulation and translation, suggesting a better intracellular metabolic environment for the synthesis of ϵ-PL in mutant SS-62. To confirm these bioinformatics analyses, qRT-PCR was employed to investigate the transcriptional levels of pls, frr and hrdD and their transcription levels were found to have increased more than 4-fold. Further, overexpression of pls and frr resulted in an increase in ϵ-PL titer and the yield of ϵ-PL per unit cell. This report not only represents the first comprehensive study on comparative proteomics in S. albulus, but it would also guide strain engineering to further improve ϵ-PL production.

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