Journal of Microbiology

Journal Article

Crystal structure of the nuclease and capping domain of SbcD from Staphylococcus aureus: Jinwook Lee , Inseong Jo , Jinsook Ahn , Seokho Hong , Soyeon Jeong , Aeran Kwon , Nam-Chul Ha; J. Microbiol. 2021;59(6):584-589. Published online April 20, 2021; DOI: https://doi.org/10.1007/s12275-021-1012-0

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The SbcCD complex is an essential component of the DNA double-strand break (DSB) repair system in bacteria. The bacterial SbcCD complex recognizes and cleaves the DNA ends in DSBs by ATP-dependent endo- and exonuclease activities as an early step of the DNA repair process. SbcD consists of nuclease, capping, and helix-loop-helix domains. Here, we present the crystal structure of a SbcD fragment from Staphylococcus aureus, which contained nuclease and capping domains, at a resolution of 2.9 Å. This structure shows a dimeric assembly similar to that of the corresponding domains of SbcD from Escherichia coli. The S. aureus SbcD fragment exhibited endonuclease activities on supercoiled DNA and exonuclease activity on linear and nicked DNA. This study contributes to the understanding of the molecular basis for how bacteria can resist sterilizing treatment, causing DNA damage.

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Staphylococcus aureus SOS response: Activation, impact, and drug targets
Kaiying Cheng, Yukang Sun, Huan Yu, Yingxuan Hu, Yini He, Yuanyuan Shen
mLife.2024; 3(3): 343. CrossRef

Research Support, Non-U.S. Gov't

Development and Evaluation of Multiplex Real-time RT-PCR Assays for Seasonal, Pandemic A/H1pdm09 and Avian A/H5 Influenza Viruses Detection: Jang-Hoon Choi , Mi-Seon Kim , Joo-Yeon Lee , Nam-Joo Lee , Donghyok Kwon , Min Gu Kang , Chun Kang; J. Microbiol. 2013;51(2):252-257. Published online April 27, 2013; DOI: https://doi.org/10.1007/s12275-013-2452-y

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Abstract: Since the pandemic influenza A (H1N1) 2009 ((H1N1)pdm09) virus spread all over the world, the (H1N1)pdm09 virus has been circulating with seasonal influenza viruses. We developed rapid and sensitive one-step multiplex real-time RTPCR assays (rRT-PCR) for simultaneous detection of influenza viruses currently circulating in humans, and the avian A/H5 virus. The detection limit of each assay was 4.8 to 1 copies per reaction and no cross-reactivity with other major respiratory pathogens was found. Analytical positive predictive value (PPV), negative predictive value (NPV) sensitivity and specificity were 100%, 94.1%, 93.7% and 100%, respectively. Clinical evaluation revealed that 1,976 (16.5%) of 11,963 throat swabs from patients with respiratory symptoms were confirmed as 1,651 (83.6%) A/H1pdm09, 308 (15.6%) A/H3 and 17 (0.8%) B virus during the 2010-2011 influenza season. Collectively, the multiplex rRT-PCR assays described here provide a practical tool for reliable implementation of influenza surveillance and diagnosis.

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