8ROR

Single-particle cryo-EM of Mycoplasma pneumoniae adhesin P1 complexed with the anti-adhesive Fab fragment.

8ROR の概要

• エントリーDOI: 10.2210/pdb8ror/pdb
• EMDBエントリー: 19402
• 分子名称: Adhesin P1, Light Chain Fab, Heavy Chain Fab, ... (4 entities in total)
• 機能のキーワード: adhesin, mycoplasma pneumoniae, sialic acid, adhesion, cell adhesion
• 由来する生物種: Mycoplasmoides pneumoniae M129; 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 206229.12

構造登録者

Vizarraga, D.,Kawamoto, A.,Marcos-Silva, M.,Fita, I.,Miyata, M.,Pinyol, J.,Namba, K.,Kenri, T. (登録日: 2024-01-12, 公開日: 2025-03-05, 最終更新日: 2025-07-09)

主引用文献

Vizarraga, D.,Kawamoto, A.,Marcos-Silva, M.,Martin, J.,Makino, F.,Miyata, T.,Roel-Touris, J.,Marcos, E.,Pich, O.Q.,Aparicio, D.,Fita, I.,Miyata, M.,Pinol, J.,Namba, K.,Kenri, T.
Dynamics of the adhesion complex of the human pathogens Mycoplasma pneumoniae and Mycoplasma genitalium.
Plos Pathog., 21:e1012973-e1012973, 2025

PubMed Abstract: Mycoplasma pneumoniae and Mycoplasma genitalium are bacterial wall-less human pathogens and the causative agents of respiratory and reproductive tract infections. Infectivity, gliding motility and adhesion of these mycoplasmas to host cells are mediated by orthologous adhesin proteins forming a transmembrane adhesion complex that binds to sialylated oligosaccharides human cell ligands. Here we report the cryo-EM structure of M. pneumoniae P1 adhesin bound to the Fab fragment of monoclonal antibody P1/MCA4, which stops gliding and induces detachment of motile cells. The epitope of P1/MCA4 involves residues only from the small C-domain of P1. This epitope is accessible to antibodies only in the "closed conformation" of the adhesion complex and is not accessible in the "open" conformation, when the adhesion complex is ready for attachment to sialylated oligosaccharides. Polyclonal antibodies generated against the large N-domain of P1 or against the whole ectodomain of P40/P90 have little or no effects on adhesion or motility. Moreover, mutations in the highly conserved Engelman motifs found in the transmembrane helix of M. genitalium P110 adhesin also alter adhesion and motility. These results show that antibodies directed to the C-domain of P1 hinder the large conformational rearrangements in this domain required to alternate between the "open" and "closed" conformations of the adhesion complex. Since transition between both conformations is essential to complete the attachment/detachment cycle of the adhesion complex, interfering with the gliding of mycoplasma cells and providing a new potential target to confront M. pneumoniae and M. genitalium infections.

PubMed: 40153444
DOI: 10.1371/journal.ppat.1012973

実験手法

ELECTRON MICROSCOPY (2.39 Å)