Evaluating inositol phospholipid interactions with inward rectifier potassium channels and characterising their role in disease.
Evaluating inositol phospholipid interactions with inward rectifier potassium channels and characterising their role in disease.
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评估肌醇磷脂与内向整流钾通道的相互作用,并表征其在疾病中的作用。
DOI:
10.1038/s42004-020-00391-0
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发表时间:
2020-10-30
影响因子:
5.9
通讯作者:
Stansfeld, Phillip J.
中科院分区:
文献类型:
--
作者:
Pipatpolkai, Tanadet;Corey, Robin A.;Proks, Peter;Ashcroft, Frances M.;Stansfeld, Phillip J.
Membrane proteins are frequently modulated by specific protein-lipid interactions. The activation of human inward rectifying potassium (hKir) channels by phosphoinositides (PI) has been well characterised. Here, we apply a coarse-grained molecular dynamics free-energy perturbation (CG-FEP) protocol to capture the energetics of binding of PI lipids to hKir channels. By using either a single- or multi-step approach, we establish a consistent value for the binding of PIP2 to hKir channels, relative to the binding of the bulk phosphatidylcholine phospholipid. Furthermore, by perturbing amino acid side chains on hKir6.2, we show that the neonatal diabetes mutation E179K increases PIP2 affinity, while the congenital hyperinsulinism mutation K67N results in a reduced affinity. We show good agreement with electrophysiological data where E179K exhibits a reduction in neomycin sensitivity, implying that PIP2 binds more tightly E179K channels. This illustrates the application of CG-FEP to compare affinities between lipid species, and for annotating amino acid residues. Protein-lipid interactions can mediate the function of membrane proteins. Here coarse-grained molecular dynamics free energy perturbation simulations yield binding free energies for phosphoinositide lipids to hKir channels and mutants, in agreement with electrophysiological measurements.
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影响因子:
64.8
作者:
Hansen, Scott B.;Tao, Xiao;MacKinnon, Roderick
通讯作者:
MacKinnon, Roderick
影响因子:
3.5
作者:
Klimovich, Pavel V.;Shirts, Michael R.;Mobley, David L.
通讯作者:
Mobley, David L.
DOI:
10.1016/j.bbamem.2016.02.037
发表时间:
2016-10
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
Hedger G;Sansom MSP
通讯作者:
Sansom MSP
影响因子:
56.9
作者:
Baukrowitz, T;Schulte, U;Fakler, B
通讯作者:
Fakler, B
影响因子:
5.8
作者:
Huopio, H;Jääskeläinen, J;Otonkoski, T
通讯作者:
Otonkoski, T