Yun Mi Lee, Jae Kap Jeong, Jung Mi Lee, Eun-Hye Kim, Tu Nhat Le, Dong-Kwon Rhee, Hyun-Ah Kang, Doo-Byoung Oh, Ohsuk Kwon
언어
영어(ENG)
URL
https://www.earticle.net/Article/A192443
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원문정보
초록
영어
Streptococcus pneumoniae, the major causative agent for pneumonia, otitis media and meningitis, produces surface exoglycosidases such as neuraminidase (NanA), β-galactosidase (BgaA) and N-acetylglucosaminidase (StrH). These enzymes play critical roles for colonization and pathogenesis by sequentially hydrolyzing various glycoconjugates to penetrate host defense molecules, to expose binding sites on the surface of the epithelial cells or to obtain monosaccharides for growth. In this study, we characterized a novel β-galactosidase encoded by the bgaC gene of S. pneumoniae. The recombinant BgaC protein exhibited a highly regio- and sugar-specific hydrolysis activity for Galβ(1,3)GlcNAc moiety of oligosaccharides. Interestingly, the BgaC was shown to be expressed as a surface protein, even though it does not have a typical signal sequence or membrane anchorage motif. The bgaC mutant strains did not show detectable changes in growth or morphology compared to wild type stains when cultivated under normal laboratory conditions. However, the bgaC mutant showed higher colonization levels at 6 and 12 h post-infection in vivo than the wild type. Our data strongly indicate that S. pneumoniae BgaC is a surface-associated β-galactosidase with a specific hydrolysis activity that contributes significantly to the adherence and invasion of pneumococci in vivo and in vitro.
저자
Yun Mi Lee [ Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Jae Kap Jeong [ Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Jung Mi Lee [ Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Eun-Hye Kim [ College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea ]
Tu Nhat Le [ College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea ]
Dong-Kwon Rhee [ College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea ]
Hyun-Ah Kang [ Department of Life Science, Chung-Ang University, Seoul 156-756, Korea ]
Doo-Byoung Oh [ Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
Ohsuk Kwon [ Korean Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea ]
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.