Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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SCO6992, a Protein with β-Glucuronidase Activity, Complements a Mutation at the absR Locus and Promotes Antibiotic Biosynthesis in Streptomyces coelicolor

  • Jin, Xue-Mei (Department of Bioscience and Bioinformatics, Myongji University) ;
  • Choi, Mu-Yong (Department of Biotechnology. The University of Suwon) ;
  • Tsevelkhoroloo, Maral (Department of Bioscience and Bioinformatics, Myongji University) ;
  • Park, Uhnmee (Department of Biotechnology. The University of Suwon) ;
  • Suh, Joo-Won (Department of Bioscience and Bioinformatics, Myongji University) ;
  • Hong, Soon-Kwang (Department of Bioscience and Bioinformatics, Myongji University)
  • Received : 2021.08.02
  • Accepted : 2021.09.23
  • Published : 2021.11.28
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Abstract

Streptomyces coelicolor is a filamentous soil bacterium producing several kinds of antibiotics. S. coelicolor abs8752 is an abs (antibiotic synthesis deficient)-type mutation at the absR locus; it is characterized by an incapacity to produce any of the four antibiotics synthesized by its parental strain J1501. A chromosomal DNA fragment from S. coelicolor J1501, capable of complementing the abs- phenotype of the abs8752 mutant, was cloned and analyzed. DNA sequencing revealed that two complete ORFs (SCO6992 and SCO6993) were present in opposite directions in the clone. Introduction of SCO6992 in the mutant strain resulted in a remarkable increase in the production of two pigmented antibiotics, actinorhodin and undecylprodigiosin, in S. coelicolor J1501 and abs8752. However, introduction of SCO6993 did not show any significant difference compared to the control, suggesting that SCO6992 is primarily involved in stimulating the biosynthesis of antibiotics in S. coelicolor. In silico analysis of SCO6992 (359 aa, 39.5 kDa) revealed that sequences homologous to SCO6992 were all annotated as hypothetical proteins. Although a metalloprotease domain with a conserved metal-binding motif was found in SCO6992, the recombinant rSCO6992 did not show any protease activity. Instead, it showed very strong β-glucuronidase activity in an API ZYM assay and toward two artificial substrates, p-nitrophenyl-β-D-glucuronide and AS-BI-β-D-glucuronide. The binding between rSCO6992 and Zn2+ was confirmed by circular dichroism spectroscopy. We report for the first time that SCO6992 is a novel protein with β-glucuronidase activity, that has a distinct primary structure and physiological role from those of previously reported β-glucuronidases.

Keywords

Acknowledgement

The Authors are extremely grateful to Dr. Charnpness in Michigan State Univ. for the Streptomyces coelicolor abs8752 strain. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2020R1F1A1060789).

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