Full-Length OmpA: Structure, Function, and Membrane Interactions Predicted by Molecular Dynamics Simulations

被引:53
|
作者
Ortiz-Suarez, Maite L. [1 ]
Samsudin, Firdaus [1 ]
Piggot, Thomas J. [1 ]
Bond, Peter J. [2 ,3 ]
Khalid, Syma [1 ]
机构
[1] Univ Southampton, Sch Chem, Highfield Campus, Southampton, Hants, England
[2] ASTAR, Bioinformat Inst, Singapore, Singapore
[3] Natl Univ Singapore, Dept Biol Sci, Singapore, Singapore
基金
英国生物技术与生命科学研究理事会;
关键词
BACTERIAL OUTER-MEMBRANE; ESCHERICHIA-COLI; E.-COLI; DETERGENT MICELLES; NMR-SPECTROSCOPY; FORCE-FIELD; X-RAY; PROTEIN; DOMAIN; DISTRIBUTIONS;
D O I
10.1016/j.bpj.2016.09.009
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
OmpA is a multidomain protein found in the outer membranes of most Gram-negative bacteria. Despite a wealth of reported structural and biophysical studies, the structure-function relationships of this protein remain unclear. For example, it is still debated whether it functions as a pore, and the precise molecular role it plays in attachment to the peptidoglycan of the periplasm is unknown. The absence of a consensus view is partly due to the lack of a complete structure of the full-length protein. To address this issue, we performed molecular-dynamics simulations of the full-length model of the OmpA dimer proposed by Robinson and co-workers. The N-terminal domains were embedded in an asymmetric model of the outer membrane, with lipopolysaccharide molecules in the outer leaflet and phospholipids in the inner leaflet. Our results reveal a large dimerization interface within the membrane environment, ensuring that the dimer is stable over the course of the simulations. The linker is flexible, expanding and contracting to pull the globular C-terminal domain up toward the membrane or push it down toward the periplasm, suggesting a possible mechanism for providing mechanical stability to the cell. The external loops were more stabilized than was observed in previous studies due to the extensive dimerization interface and presence of lipopolysaccharide molecules in our outer-membrane model, which may have functional consequences in terms of OmpA adhesion to host cells. In addition, the pore-gating behavior of the protein was modulated compared with previous observations, suggesting a possible role for dimerization in channel regulation.
引用
收藏
页码:1692 / 1702
页数:11
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