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-Structure paper
タイトル | Plant receptor-like protein activation by a microbial glycoside hydrolase. |
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ジャーナル・号・ページ | Nature, Vol. 610, Issue 7931, Page 335-342, Year 2022 |
掲載日 | 2022年9月21日 |
著者 | Yue Sun / Yan Wang / Xiaoxiao Zhang / Zhaodan Chen / Yeqiang Xia / Lei Wang / Yujing Sun / Mingmei Zhang / Yu Xiao / Zhifu Han / Yuanchao Wang / Jijie Chai / |
PubMed 要旨 | Plants rely on cell-surface-localized pattern recognition receptors to detect pathogen- or host-derived danger signals and trigger an immune response. Receptor-like proteins (RLPs) with a leucine- ...Plants rely on cell-surface-localized pattern recognition receptors to detect pathogen- or host-derived danger signals and trigger an immune response. Receptor-like proteins (RLPs) with a leucine-rich repeat (LRR) ectodomain constitute a subgroup of pattern recognition receptors and play a critical role in plant immunity. Mechanisms underlying ligand recognition and activation of LRR-RLPs remain elusive. Here we report a crystal structure of the LRR-RLP RXEG1 from Nicotiana benthamiana that recognizes XEG1 xyloglucanase from the pathogen Phytophthora sojae. The structure reveals that specific XEG1 recognition is predominantly mediated by an amino-terminal and a carboxy-terminal loop-out region (RXEG1(ID)) of RXEG1. The two loops bind to the active-site groove of XEG1, inhibiting its enzymatic activity and suppressing Phytophthora infection of N. benthamiana. Binding of XEG1 promotes association of RXEG1(LRR) with the LRR-type co-receptor BAK1 through RXEG1(ID) and the last four conserved LRRs to trigger RXEG1-mediated immune responses. Comparison of the structures of apo-RXEG1(LRR), XEG1-RXEG1(LRR) and XEG1-BAK1-RXEG1(LRR) shows that binding of XEG1 induces conformational changes in the N-terminal region of RXEG1(ID) and enhances structural flexibility of the BAK1-associating regions of RXEG1(LRR). These changes allow fold switching of RXEG1(ID) for recruitment of BAK1(LRR). Our data reveal a conserved mechanism of ligand-induced heterodimerization of an LRR-RLP with BAK1 and suggest a dual function for the LRR-RLP in plant immunity. |
リンク | Nature / PubMed:36131021 |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.92 - 3.59 Å |
構造データ | EMDB-30826, PDB-7drc: EMDB-32293, PDB-7w3t: EMDB-32294, PDB-7w3v: EMDB-32295, PDB-7w3x: PDB-7drb: |
化合物 | ChemComp-NAG: |
由来 |
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キーワード | PLANT PROTEIN / LRR / PTI / Glycoside hydrolase / Inhibitor |