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6BL6

Crystallization of lipid A transporter MsbA from Salmonella typhimurium

Summary for 6BL6
Entry DOI10.2210/pdb6bl6/pdb
DescriptorLipid A export ATP-binding/permease protein MsbA (1 entity in total)
Functional Keywordsmsba, lipid a co-crystallization, abc transporters, staphylococcus typhimurium, membrane protein
Biological sourceSalmonella enterica subsp. enterica serovar Typhimurium str. LT2
Total number of polymer chains2
Total formula weight127215.13
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 citationPadayatti, 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: 31130486
DOI: 10.1016/j.str.2019.04.007
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (2.8 Å)
Structure validation

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数据于2025-06-25公开中

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