Identification and assessment of cardiolipin interactions with E. coli inner membrane proteins.

Identification and assessment of cardiolipin interactions with E. coli inner membrane proteins.
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DOI:
10.1126/sciadv.abh2217
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发表时间:
2021-08
期刊:
影响因子:
13.6
通讯作者:
Stansfeld PJ
Stansfeld PJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Corey RA;Song W;Duncan AL;Ansell TB;Sansom MSP;Stansfeld PJ

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This study uses MD simulations to identify and analyze >700 binding sites for cardiolipin to a set of bacterial membrane proteins. Integral membrane proteins are localized and/or regulated by lipids present in the surrounding bilayer. While bacteria have relatively simple membranes, there is ample evidence that many bacterial proteins bind to specific lipids, especially the anionic lipid cardiolipin. Here, we apply molecular dynamics simulations to assess lipid binding to 42 different Escherichia coli inner membrane proteins. Our data reveal an asymmetry between the membrane leaflets, with increased anionic lipid binding to the inner leaflet regions of the proteins, particularly for cardiolipin. From our simulations, we identify >700 independent cardiolipin binding sites, allowing us to identify the molecular basis of a prototypical cardiolipin binding site, which we validate against structures of bacterial proteins bound to cardiolipin. This allows us to construct a set of metrics for defining a high-affinity cardiolipin binding site on bacterial membrane proteins, paving the way for a heuristic approach to defining other protein-lipid interactions.
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