著者

Taichi Kamo Keiichi Kuroda Shota Kondo Usaki Hayashi Satoshi Fudo Tomoki Yoneda Akiko Takaya Michiyoshi Nukaga Tyuji Hoshino

出版者

The Pharmaceutical Society of Japan

雑誌

Chemical and Pharmaceutical Bulletin (ISSN:00092363)

巻号頁・発行日

vol.69, no.12, pp.1179-1183, 2021-12-01 (Released:2021-12-01)

参考文献数

29

被引用文献数

2

---

Metallo-β-lactamases (MBLs) are significant threats to humans because they deteriorate many kinds of β-lactam antibiotics and are key enzymes responsible for multi-drug resistance of bacterial pathogens. As a result of in vitro screening, two compounds were identified as potent inhibitors of two kinds of MBLs: imipenemase (IMP-1) and New Delhi metallo-β-lactamase (NDM-1). The binding structure of one of the identified compounds was clarified by an X-ray crystal analysis in complex with IMP-1, in which two possible binding poses were observed. Molecular dynamics (MD) simulations were performed by building two calculation models from the respective binding poses. The compound was stably bound to the catalytic site during the simulation in one pose. The binding model between NDM-1 and the compound was constructed for MD simulation. Calculation results for NDM-1 were similar to those of IMP-1. The simulation suggested that the binding of the identified inhibitory compound was also durable in the catalytic site of NDM-1. The compound will be a sound basis for the development of the inhibitors for MBLs.

著者

Xiaoning Sun Kentaro Kawata Atsuko Miki Youichiro Wada Masami Nagahama Akiko Takaya Nobuyoshi Akimitsu

出版者

International Research and Cooperation Association for Bio & Socio-Sciences Advancement

雑誌

BioScience Trends (ISSN:18817815)

巻号頁・発行日

pp.2020.03085, (Released:2020-04-30)

参考文献数

35

被引用文献数

4

---

Salmonella enterica serovar Typhimurium (Salmonella), a pathogenic bacterium, is a major cause of foodborne diseases worldwide. Salmonella injects multiple virulence factors, called effectors, into cells and causes multiple rearrangements of cellular biological reactions that are important for Salmonella proliferation and virulence. Previously, we reported that Salmonella infection causes loss of MTR4 and RRP6, which are nuclear RNA degradation factors, resulting in the stabilization and accumulation of unstable nuclear RNAs. This accumulation is important for the cellular defense for Salmonella infection. In this study, we examined a series of Salmonella mutant strains, most of which are strains with genes related to effectors translocated by T3SSs encoded on Salmonella pathogenic islands, SPI-1 and SPI-2, that have been depleted. Among 42 Salmonella mutants, 6 mutants' infections canceled loss of MTR4 and RRP6. Proliferation assay of Salmonella in the cell revealed that six mutants showed poor proliferation in the host cell, demonstrating that poor proliferation contributed to cancellation of MTR4 and RRP6 loss. This result indicates that certain events associated with Salmonella proliferation in host cells cause loss of MTR4 and RRP6.