期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 124, 期 31, 页码 6709-6720出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.0c04575
关键词
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资金
- Canadian Institutes of Health Research [MOP-84281, NJT-155930]
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2018-04351]
Intrinsically disordered proteins (IDPs) are important for biological functions. In contrast to folded proteins, molecular recognition among certain IDPs is fuzzy in that their binding and/or phase separation are stochastically governed by the interacting IDPs' amino acid sequences, while their assembled conformations remain largely disordered. To help elucidate a basic aspect of this fascinating yet poorly understood phenomenon, the binding of a homo or heterodimeric pair of polyampholytic IDPs is modeled statistical mechanically using cluster expansion. We find that the binding affinities of binary fuzzy complexes in the model correlate strongly with a newly derived simple joint sequence charge decoration parameter readily calculable from the pair of IDPs' sequence charge patterns. Predictions by our analytical theory are in essential agreement with coarse-grained explicit-chain simulations. This computationally efficient theoretical framework is expected to be broadly applicable to rationalizing and predicting sequence-specific IDP-IDP polyelectrostatic interactions.
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