+検索条件
-Structure paper
タイトル | Structural and functional insights into oligopeptide acquisition by the RagAB transporter from Porphyromonas gingivalis. |
---|---|
ジャーナル・号・ページ | Nat Microbiol, Vol. 5, Issue 8, Page 1016-1025, Year 2020 |
掲載日 | 2020年5月11日 |
著者 | Mariusz Madej / Joshua B R White / Zuzanna Nowakowska / Shaun Rawson / Carsten Scavenius / Jan J Enghild / Grzegorz P Bereta / Karunakar Pothula / Ulrich Kleinekathoefer / Arnaud Baslé / Neil A Ranson / Jan Potempa / Bert van den Berg / |
PubMed 要旨 | Porphyromonas gingivalis, an asaccharolytic member of the Bacteroidetes, is a keystone pathogen in human periodontitis that may also contribute to the development of other chronic inflammatory ...Porphyromonas gingivalis, an asaccharolytic member of the Bacteroidetes, is a keystone pathogen in human periodontitis that may also contribute to the development of other chronic inflammatory diseases. P. gingivalis utilizes protease-generated peptides derived from extracellular proteins for growth, but how these peptides enter the cell is not clear. Here, we identify RagAB as the outer-membrane importer for these peptides. X-ray crystal structures show that the transporter forms a dimeric RagAB complex, with the RagB substrate-binding surface-anchored lipoprotein forming a closed lid on the RagA TonB-dependent transporter. Cryo-electron microscopy structures reveal the opening of the RagB lid and thus provide direct evidence for a 'pedal bin' mechanism of nutrient uptake. Together with mutagenesis, peptide-binding studies and RagAB peptidomics, our work identifies RagAB as a dynamic, selective outer-membrane oligopeptide-acquisition machine that is essential for the efficient utilization of proteinaceous nutrients by P. gingivalis. |
リンク | Nat Microbiol / PubMed:32393857 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.61 - 3.4 Å |
構造データ | EMDB-10241, PDB-6sm3: EMDB-10243, PDB-6sml: EMDB-10245, PDB-6smq: PDB-6sli: PDB-6slj: PDB-6sln: |
化合物 | ChemComp-5PL: ChemComp-C8E: ChemComp-3PE: ChemComp-LMT: ChemComp-PLM: ChemComp-HOH: |
由来 |
|
キーワード | MEMBRANE PROTEIN / outer membrane protein / Bacteroidetes / TonB dependent transporter / Beta-barrel / OMP / TonB-dependent / transporter |