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• W4311399008 abstract "Allosteric signaling within multidomain proteins is a driver of communication between spatially distant functional sites. Understanding the mechanism of allosteric coupling in large multidomain proteins is the most promising route to achieving spatial and temporal control of the system. The recent explosion of CRISPR-Cas9 applications in molecular biology and medicine has created a need to understand how the atomic level protein dynamics of Cas9, which are the driving force of its allosteric crosstalk, influence its biophysical characteristics. In this study, we used a synergistic approach of nuclear magnetic resonance (NMR) and computation to pinpoint an allosteric hotspot in the HNH domain of the thermostable GeoCas9. We show that mutation of K597 to alanine disrupts a salt-bridge network, which in turn alters the structure, the timescale of allosteric motions, and the thermostability of the GeoHNH domain. This homologous lysine-to-alanine mutation in the extensively studied mesophilic S. pyogenes Cas9 similarly alters the dynamics of the SpHNH domain. We have previously demonstrated that the alteration of allostery via mutations is a source for the specificity enhancement of SpCas9 (e SpCas9). Hence, this may also be true in GeoCas9." @default.
• W4311399008 created "2022-12-26" @default.
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• W4311399008 date "2022-12-14" @default.
• W4311399008 modified "2023-10-15" @default.
• W4311399008 title "Disruption of electrostatic contacts in the HNH nuclease from a thermophilic Cas9 rewires allosteric motions and enhances high-temperature DNA cleavage" @default.
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• W4311399008 doi "https://doi.org/10.1063/5.0128815" @default.
• W4311399008 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36546784" @default.
• W4311399008 hasPublicationYear "2022" @default.
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