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- W2017269651 abstract "Integrin α-β heterodimers recognize ligands with RGD peptide motifs, but how they differentiate between the numerous RGD-containing proteins is unknown. Here, Springer and colleagues elucidate the structural basis for ligand binding specificity of the integrin β subunit. Eight integrin α-β heterodimers recognize ligands with an Arg-Gly-Asp (RGD) motif. However, the structural mechanism by which integrins differentiate among extracellular proteins with RGD motifs is not understood. Here, crystal structures, mutations and peptide-affinity measurements show that αVβ6 binds with high affinity to a RGDLXXL/I motif within the prodomains of TGF-β1 and TGF-β3. The LXXL/I motif forms an amphipathic α-helix that binds in a hydrophobic pocket in the β6 subunit. Elucidation of the basis for ligand binding specificity by the integrin β subunit reveals contributions by three different βI-domain loops, which we designate specificity-determining loops (SDLs) 1, 2 and 3. Variation in a pair of single key residues in SDL1 and SDL3 correlates with the variation of the entire β subunit in integrin evolution, thus suggesting a paradigmatic role in overall β-subunit function." @default.
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- W2017269651 date "2014-11-10" @default.
- W2017269651 modified "2023-10-11" @default.
- W2017269651 title "Structural determinants of integrin β-subunit specificity for latent TGF-β" @default.
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- W2017269651 doi "https://doi.org/10.1038/nsmb.2905" @default.
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