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-Structure paper
タイトル | The Polygonal Cell Shape and Surface Protein Layer of Anaerobic Methane-Oxidizing Bacteria. |
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ジャーナル・号・ページ | Front Microbiol, Vol. 12, Page 766527, Year 2021 |
掲載日 | 2021年12月1日 |
著者 | Lavinia Gambelli / Rob Mesman / Wouter Versantvoort / Christoph A Diebolder / Andreas Engel / Wiel Evers / Mike S M Jetten / Martin Pabst / Bertram Daum / Laura van Niftrik / |
PubMed 要旨 | bacteria perform anaerobic methane oxidation coupled to nitrite reduction via an intra-aerobic pathway, producing carbon dioxide and dinitrogen gas. These diderm bacteria possess an unusual ... bacteria perform anaerobic methane oxidation coupled to nitrite reduction via an intra-aerobic pathway, producing carbon dioxide and dinitrogen gas. These diderm bacteria possess an unusual polygonal cell shape with sharp ridges that run along the cell body. Previously, a putative surface protein layer (S-layer) was observed as the outermost cell layer of these bacteria. We hypothesized that this S-layer is the determining factor for their polygonal cell shape. Therefore, we enriched the S-layer from cells and through LC-MS/MS identified a 31 kDa candidate S-layer protein, mela_00855, which had no homology to any other known protein. Antibodies were generated against a synthesized peptide derived from the mela_00855 protein sequence and used in immunogold localization to verify its identity and location. Both on thin sections of cells and in negative-stained enriched S-layer patches, the immunogold localization identified mela_00855 as the S-layer protein. Using electron cryo-tomography and sub-tomogram averaging of S-layer patches, we observed that the S-layer has a hexagonal symmetry. Cryo-tomography of whole cells showed that the S-layer and the outer membrane, but not the peptidoglycan layer and the cytoplasmic membrane, exhibited the polygonal shape. Moreover, the S-layer consisted of multiple rigid sheets that partially overlapped, most likely giving rise to the unique polygonal cell shape. These characteristics make the S-layer of a distinctive and intriguing case to study. |
リンク | Front Microbiol / PubMed:34925275 / PubMed Central |
手法 | EM (サブトモグラム平均) |
解像度 | 21.0 - 25.0 Å |
構造データ | EMDB-13670: EMDB-13672: |
由来 |
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