Journal of Shanghai Jiaotong University ›› 2014, Vol. 48 ›› Issue (02): 159-163.

• Bilogical Science •     Next Articles

Functional Analysis of Lincomycin Transporter Gene lmrC in Streptomyces Lincolnensis LC-G

XU Jingjing1,WU Hang1,MENG Sitong2,LIU Ruihua3  HUANG Xunduan1,ZHANG Buchang1,BAI Linquan2
  

  1. (1.School of Life Science, Anhui University, Hefei 230601, China; 2.State Key Laboratory of Microbial Metabolism, Shanghai Jiaotong University, Shanghai 200240, China; 3.Anhui Wanbei Pharmaceutical Co. Ltd., Suzhou 234000, Anhui, China)
  • Received:2013-01-12 Online:2014-02-28 Published:2014-02-28

Abstract:

To investigate the role of  lincomycin transporter LmrC in lincomycin biosynthesis, lmrC was deleted in a lincomycin high-yielding strain LC-G by homologous recombination. HPLC analysis and resistance assay indicated that lincomycin production and self-resistance in XJJ7, and the lmrC mutant were decreased by 55% and 50%, respectively. Quantitative real-time polymerase chain reaction(PCR) analysis showed that the transcriptional levels of structure genes lmbA and lmbR were drastically reduced, whereas the expression of a regulatory gene lmbU did not change in XJJ7. Moreover, overexpression of lmrC in LCG could not increase the lincomycin yield and the expression of lmbA, lmbR and lmbU as well. However, the resistance to lincomycin was improved in the lmrCoverexpressed strain. Therefore, lmrC was proved to be involved in lincomycin biosynthesis by affecting the transcription of structure genes and confer lincomycin resistance to Streptomyces lincolnensis. 

Key words: Streptomyces lincolnensis, lincomycin, ATP-binding cassette (ABC) transporter, resistance

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