6BL6

Crystallization of lipid A transporter MsbA from Salmonella typhimurium

6BL6 の概要

• エントリーDOI: 10.2210/pdb6bl6/pdb
• 分子名称: Lipid A export ATP-binding/permease protein MsbA (1 entity in total)
• 機能のキーワード: msba, lipid a co-crystallization, abc transporters, staphylococcus typhimurium, membrane protein
• 由来する生物種: Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 127215.13

構造登録者

Padayatti, P.S.,Stanfield, R.L.,Zhang, Q.,Wilson, I.A.,Lee, S.C. (登録日: 2017-11-09, 公開日: 2019-01-09, 最終更新日: 2023-10-04)

主引用文献

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

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

実験手法

X-RAY DIFFRACTION (2.8 Å)