6BL6
Crystallization of lipid A transporter MsbA from Salmonella typhimurium
Summary for 6BL6
Entry DOI | 10.2210/pdb6bl6/pdb |
Descriptor | Lipid A export ATP-binding/permease protein MsbA (1 entity in total) |
Functional Keywords | msba, lipid a co-crystallization, abc transporters, staphylococcus typhimurium, membrane protein |
Biological source | Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 |
Total number of polymer chains | 2 |
Total formula weight | 127215.13 |
Authors | Padayatti, P.S.,Stanfield, R.L.,Zhang, Q.,Wilson, I.A.,Lee, S.C. (deposition date: 2017-11-09, release date: 2019-01-09, Last modification date: 2023-10-04) |
Primary citation | Padayatti, P.S.,Lee, S.C.,Stanfield, R.L.,Wen, P.C.,Tajkhorshid, E.,Wilson, I.A.,Zhang, Q. Structural Insights into the Lipid A Transport Pathway in MsbA. Structure, 27:1114-, 2019 Cited by PubMed Abstract: MsbA is an essential ATP-binding cassette transporter in Gram-negative bacteria that transports lipid A and lipopolysaccharide from the cytoplasmic leaflet to the periplasmic leaflet of the inner membrane. Here we report the X-ray structure of MsbA from Salmonella typhimurium at 2.8-Å resolution in an inward-facing conformation after cocrystallization with lipid A and using a stabilizing facial amphiphile. The structure displays a large amplitude opening in the transmembrane portal, which is likely required for lipid A to pass from its site of synthesis into the protein-enclosed transport pathway. Putative lipid A density is observed further inside the transmembrane cavity, consistent with a trap and flip model. Additional electron density attributed to lipid A is observed near an outer surface cleft at the periplasmic ends of the transmembrane helices. These findings provide new structural insights into the lipid A transport pathway through comparative analysis with existing MsbA structures. PubMed: 31130486DOI: 10.1016/j.str.2019.04.007 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (2.8 Å) |
Structure validation
Download full validation report
