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Energy landscape reshaped by strain-specific mutations underlies epistasis in NS1 evolution of influenza A virus.


ABSTRACT: Elucidating how individual mutations affect the protein energy landscape is crucial for understanding how proteins evolve. However, predicting mutational effects remains challenging because of epistasis-the nonadditive interactions between mutations. Here, we investigate the biophysical mechanism of strain-specific epistasis in the nonstructural protein 1 (NS1) of influenza A viruses (IAVs). We integrate structural, kinetic, thermodynamic, and conformational dynamics analyses of four NS1s of influenza strains that emerged between 1918 and 2004. Although functionally near-neutral, strain-specific NS1 mutations exhibit long-range epistatic interactions with residues at the p85β-binding interface. We reveal that strain-specific mutations reshaped the NS1 energy landscape during evolution. Using NMR spin dynamics, we find that the strain-specific mutations altered the conformational dynamics of the hidden network of tightly packed residues, underlying the evolution of long-range epistasis. This work shows how near-neutral mutations silently alter the biophysical energy landscapes, resulting in diverse background effects during molecular evolution.

SUBMITTER: Kim I 

PROVIDER: S-EPMC9526705 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Energy landscape reshaped by strain-specific mutations underlies epistasis in NS1 evolution of influenza A virus.

Kim Iktae I   Dubrow Alyssa A   Zuniga Bryan B   Zhao Baoyu B   Sherer Noah N   Bastiray Abhishek A   Li Pingwei P   Cho Jae-Hyun JH  

Nature communications 20221001 1


Elucidating how individual mutations affect the protein energy landscape is crucial for understanding how proteins evolve. However, predicting mutational effects remains challenging because of epistasis-the nonadditive interactions between mutations. Here, we investigate the biophysical mechanism of strain-specific epistasis in the nonstructural protein 1 (NS1) of influenza A viruses (IAVs). We integrate structural, kinetic, thermodynamic, and conformational dynamics analyses of four NS1s of inf  ...[more]

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