5ZFV
Structure of the ExbB/ExbD pentameric complex (ExbB5ExbD1TM)
Summary for 5ZFV
| Entry DOI | 10.2210/pdb5zfv/pdb |
| EMDB information | 6927 6928 |
| Descriptor | Biopolymer transport protein ExbB, 22-mer peptide from Biopolymer transport protein ExbD (2 entities in total) |
| Functional Keywords | ton system, ion channel, energizer, transporter, proton motive force, transport protein |
| Biological source | Escherichia coli (strain K12) More |
| Cellular location | Cell inner membrane; Multi-pass membrane protein: P0ABU7 Cell inner membrane; Single-pass type II membrane protein: P0ABV2 |
| Total number of polymer chains | 6 |
| Total formula weight | 133991.67 |
| Authors | Yonekura, K.,Yamashita, Y.,Matsuoka, R.,Maki-Yonekura, S. (deposition date: 2018-03-07, release date: 2018-05-09, Last modification date: 2024-11-13) |
| Primary citation | Maki-Yonekura, S.,Matsuoka, R.,Yamashita, Y.,Shimizu, H.,Tanaka, M.,Iwabuki, F.,Yonekura, K. Hexameric and pentameric complexes of the ExbBD energizer in the Ton system. Elife, 7:-, 2018 Cited by PubMed Abstract: Gram-negative bacteria import essential nutrients such as iron and vitamin B through outer membrane receptors. This process utilizes proton motive force harvested by the Ton system made up of three inner membrane proteins, ExbB, ExbD and TonB. ExbB and ExbD form the proton channel that energizes uptake through TonB. Recently, crystal structures suggest that the ExbB pentamer is the scaffold. Here, we present structures of hexameric complexes of ExbB and ExbD revealed by X-ray crystallography and single particle cryo-EM. Image analysis shows that hexameric and pentameric complexes coexist, with the proportion of hexamer increasing with pH. Channel current measurement and 2D crystallography support the existence and transition of the two oligomeric states in membranes. The hexameric complex consists of six ExbB subunits and three ExbD transmembrane helices enclosed within the central channel. We propose models for activation/inactivation associated with hexamer and pentamer formation and utilization of proton motive force. PubMed: 29661272DOI: 10.7554/eLife.35419 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (7.1 Å) |
Structure validation
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