Identification of evolutionarily conserved virulence factor by selective pressure analysis of Streptococcus pneumoniae

Masaya Yamaguchi, Kana Goto, Yujiro Hirose, Yuka Yamaguchi, Tomoko Sumitomo, Masanobu Nakata, Kazuhiko Nakano, Shigetada Kawabata

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Evolutionarily conserved virulence factors can be candidate therapeutic targets or vaccine antigens. Here, we investigated the evolutionary selective pressures on 16 pneumococcal choline-binding cell-surface proteins since Streptococcus pneumoniae is one of the pathogens posing the greatest threats to human health. Phylogenetic and molecular analyses revealed that cbpJ had the highest codon rates to total numbers of codons under considerable negative selection among those examined. Our in vitro and in vivo assays indicated that CbpJ functions as a virulence factor in pneumococcal pneumonia by contributing to evasion of neutrophil killing. Deficiency of cbpL under relaxed selective pressure also caused a similar tendency but showed no significant difference in mouse intranasal infection. Thus, molecular evolutionary analysis is a powerful tool that reveals the importance of virulence factors in real-world infection and transmission, since calculations are performed based on bacterial genome diversity following transmission of infection in an uncontrolled population.

Original languageEnglish
Article number96
JournalCommunications Biology
Issue number1
Publication statusPublished - Dec 1 2019
Externally publishedYes

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences
  • Medicine (miscellaneous)


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