2015.03.19，我院吳清發(fā)教授研究組在Scientific? Reports上在線發(fā)表題為
"Identification of genetic variations associated with epsilon-poly-lysine biosynthesis in Streptomyces albulus ZPM by genome sequencing"的研究論文.
作 者：Lin Wang, Chunhui Gao, Nan Tang, Songnian Hu，Qingfa Wu
Abstract
The biosynthesis of the antibiotic epsilon-poly-lysine (ε-PL) in Streptomyces albulus is performed by polylysine synthase (pls); however, the regulatory mechanism of this process is still unknown. Here, we first obtained the complete genome sequence of S. albulus ZPM, which consists of 9,784,577 bp and has a GC content of 72.2%. The genome houses 44 gene clusters for secondary metabolite biosynthesis, in which 20 gene clusters are involved in the biosynthesis of polyketides and nonribosomally synthesized peptides. High-throughput sequencing was further performed, and genetic variants were identified from pooled libraries consisting of the 30 highest-yield mutants or 30 lowest-yield mutants. More than 350 genetic variants associated with ε-PL yield have been identified. One hundred sixty-two affected proteins, from important metabolic enzymes to novel transcriptional regulators, were identified as being related to ε-PL synthesis. HrdD, one of the affected genes, is a sigma factor that shows the most sensitive response to pH change and contains a non-synonymous mutation (A132V) in mutant strains with lower ε-PL yields. Electrophoretic mobility shift assays showed that the pls gene is likely regulated by transcriptional activator HrdD. The data obtained in this study will facilitate future studies on ε-PL yield improvement and industrial bioprocess optimization.
http://www.nature.com/srep/2015/150317/srep09201/full/srep09201.html
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