Estrogen Receptor Folding Modulates cSrc Kinase SH2 Interaction via a Helical Binding Mode

ACS Chemical Biology
Lidia NietoLuc Brunsveld

Abstract

The estrogen receptors (ERs) feature, next to their transcriptional role, important nongenomic signaling actions, with emerging clinical relevance. The Src Homology 2 (SH2) domain mediated interaction between cSrc kinase and ER plays a key role in this; however the molecular determinants of this interaction have not been elucidated. Here, we used phosphorylated ER peptide and semisynthetic protein constructs in a combined biochemical and structural study to, for the first time, provide a quantitative and structural characterization of the cSrc SH2-ER interaction. Fluorescence polarization experiments delineated the SH2 binding motif in the ER sequence. Chemical shift perturbation analysis by nuclear magnetic resonance (NMR) together with molecular dynamics (MD) simulations allowed us to put forward a 3D model of the ER-SH2 interaction. The structural basis of this protein-protein interaction has been compared with that of the high affinity SH2 binding sequence GpYEEI. The ER features a different binding mode from that of the "two-pronged plug two-hole socket" model in the so-called specificity determining region. This alternative binding mode is modulated via the folding of ER helix 12, a structural element directly C-terminal ...Continue Reading

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Citations

Jul 22, 2017·Journal of Molecular Endocrinology·Raquel S CampelloUbiratan F Machado
Nov 19, 2021·Endocrine Reviews·Franck Mauvais-JarvisEllis R Levin

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