National Natural Science Foundation of China (NSFC)
31970129
中国
National Natural Science Foundation of China (NSFC)
31800128
中国
引用
ジャーナル: Cell / 年: 2022 タイトル: TFPI is a colonic crypt receptor for TcdB from hypervirulent clade 2 C. difficile. 著者: Jianhua Luo / Qi Yang / Xiaofeng Zhang / Yuanyuan Zhang / Li Wan / Xiechao Zhan / Yao Zhou / Liuqing He / Danyang Li / Dazhi Jin / Ying Zhen / Jing Huang / Yanyan Li / Liang Tao / 要旨: The emergence of hypervirulent clade 2 Clostridioides difficile is associated with severe symptoms and accounts for >20% of global infections. TcdB is a dominant virulence factor of C. difficile, ...The emergence of hypervirulent clade 2 Clostridioides difficile is associated with severe symptoms and accounts for >20% of global infections. TcdB is a dominant virulence factor of C. difficile, and clade 2 strains exclusively express two TcdB variants (TcdB2 and TcdB4) that use unknown receptors distinct from the classic TcdB. Here, we performed CRISPR/Cas9 screens for TcdB4 and identified tissue factor pathway inhibitor (TFPI) as its receptor. Using cryo-EM, we determined a complex structure of the full-length TcdB4 with TFPI, defining a common receptor-binding region for TcdB. Residue variations within this region divide major TcdB variants into 2 classes: one recognizes Frizzled (FZD), and the other recognizes TFPI. TFPI is highly expressed in the intestinal glands, and recombinant TFPI protects the colonic epithelium from TcdB2/4. These findings establish TFPI as a colonic crypt receptor for TcdB from clade 2 C. difficile and reveal new mechanisms for CDI pathogenesis.