Research Project
Fund for the Promotion of Joint International Research (Fostering Joint International Research)
Streptococcus pyogenes produces a variety of pili and thermosensitive expression of pilus genes was previously observed in a specific serotype strain. To reveal the mechanism involved, pilus expression analysis of clinical isolates was conducted. Thermosensitive pilus production was only observed in strains possessing the nra gene encoding a transcriptional regulator. Additionally, analysis using mutant strains indicated that the Nra protein is a positive regulator of pilus genes and showed a relationship of its intracellular level with pilus production. The translational efficiency of nra mRNA was increased when the temperature was decreased and a putative stem loop structure within the coding region of nra mRNA was also shown to be involved in that. Thus, during the initial infection step, S. pyogenes may adapt to the external body surface temperature, and modulate both the translational efficiency of nra and expression levels of pili required for initial adherence to host tissues.
化膿レンサ球菌の感染初期に機能する細菌因子の産生量を規定する仕組みとして,転写を促進する因子のmRNAが環境温度の変化により構造を変化させ,その翻訳が調節されることが推察された.環境温度を感知するmRNAの部位は,主に報告されてきた非翻訳領域ではなく,翻訳領域にあるという,本菌では初めて明らかにされたmRNAによる温度感知機構であった.さらに,臨床現場で用いられてきた化膿レンサ球菌のTタイピング法において低温培養が必要とされてきたが,その理由の一端が明らかになった.
All 2020 2019 2018 2017 2016 Other
All Int'l Joint Research (1 results) Journal Article (13 results) (of which Int'l Joint Research: 7 results, Peer Reviewed: 13 results, Open Access: 12 results, Acknowledgement Compliant: 3 results) Presentation (50 results) (of which Int'l Joint Research: 6 results, Invited: 2 results) Book (2 results) Remarks (2 results)
Mol Microbiol
Volume: 113 Issue: 1 Pages: 173-189
10.1111/mmi.14408
PLoS One
Volume: 15 Issue: 4 Pages: e0231101-e0231101
10.1371/journal.pone.0231101
Front Cell Infect Microbiol
Volume: 9 Pages: 301-301
10.3389/fcimb.2019.00301
Appl Environ Microbiol
Volume: 85 Issue: 21
10.1128/aem.01428-19
J Allergy Clin Immunol
Volume: 143 Issue: 3 Pages: 1163-1175
10.1016/j.jaci.2018.07.006
生化学
Volume: 90 Issue: 1 Pages: 80-83
10.14952/SEIKAGAKU.2018.900080
40021494458
Infect Immun
Volume: 86 Issue: 3 Pages: 1-13
10.1128/iai.00894-17
Volume: 8 Pages: 10-10
10.3389/fcimb.2018.00010
Front.Microbiol
Volume: 9 Pages: 53-53
10.3389/fmicb.2018.00053
Virulence
Volume: 9 Issue: 1 Pages: 248-261
10.1080/21505594.2017.1393600
Volume: 12 Issue: 2 Pages: e0172223-e0172223
10.1371/journal.pone.0172223
Journal of Biological Chemistry
Volume: 292 Issue: 10 Pages: 4244-4254
10.1074/jbc.m116.749275
Scientific Reports
Volume: 6 Issue: 1 Pages: 28852-28852
10.1038/srep28852
https://web.dent.osaka-u.ac.jp/mcrbio/
http://web.dent.osaka-u.ac.jp/~mcrbio/