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Chlamydia pneumoniae effector chlamydial outer protein N sequesters fructose bisphosphate aldolase A, providing a benefit to bacterial growth


BMC Microbiol_14(1)_330.pdf2.13 MBPDF見る/開く

タイトル: Chlamydia pneumoniae effector chlamydial outer protein N sequesters fructose bisphosphate aldolase A, providing a benefit to bacterial growth
著者: Ishida, Kasumi 著作を一覧する
Matsuo, Junji 著作を一覧する
Yamamoto, Yoshimasa 著作を一覧する
Yamaguchi, Hiroyuki 著作を一覧する
キーワード: Chlamydia pneumoniae
Type III secretion
Chlamydial outer protein N
発行日: 2014年12月21日
出版者: Biomed Central
誌名: BMC microbiology
巻: 14
号: 1
開始ページ: 330
出版社 DOI: 10.1186/s12866-014-0330-3
抄録: Background: Pathogenic chlamydiae are obligate intracellular pathogens and have adapted successfully to human cells, causing sexually transmitted diseases or pneumonia. Chlamydial outer protein N (CopN) is likely a critical effector protein secreted by the type III secretion system in chlamydiae, which manipulates host cells. However, the mechanisms of its action remain to be clarified. In this work, we aimed to identify previously unidentified CopN effector target in host cells. Results: We first performed a pull-down assay with recombinant glutathione S-transferase (GST) fusion CopN proteins (GST-CpCopN: Chlamydia pneumoniae TW183, GST-CtCopN: Chlamydia trachomatis D/UW-3/CX) as "bait" and soluble lysates obtained from human immortal epithelial HEp-2 cells as "prey", followed by SDS-PAGE with mass spectroscopy (MS). We found that a host cell protein specifically bound to GST-CpCopN, but not GST-CtCopN. MS revealed the host protein to be fructose bisphosphate aldolase A (aldolase A), which plays a key role in glycolytic metabolism. We also confirmed the role of aldolase A in chlamydia-infected HEp-2 cells by using two distinct experiments for gene knockdown with an siRNA specific to aldolase A transcripts, and for assessment of glycolytic enzyme gene expression levels. As a result, both the numbers of chlamydial inclusion-forming units and RpoD transcripts were increased in the chlamydia-infected aldolase A knockdown cells, as compared with the wild-type HEp-2 cells. Meanwhile, chlamydial infection tended to enhance expression of aldolase A. Conclusions: We discovered that one of the C. pneumoniae CopN targets is the glycolytic enzyme aldolase A. Sequestering aldolase A may be beneficial to bacterial growth in infected host cells.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 山口 博之


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