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• W1980836191 abstract "Although membrane proteins and soluble proteins may achieve their final folded states through different pathways, it has been suggested that the packing inside a membrane protein could maintain a similar fold if the lipid-exposed surface were redesigned for solubility in an aqueous environment. To test this idea, the surface of the transmembrane domain of phospholamban (PLB), a protein that forms a stable helical homopentamer within the sarcoplasmic reticulum membrane, has been redesigned by replacing its lipid-exposed hydrophobic residues with charged and polar residues. CD spectra indicate that the full-length soluble PLB is highly alpha-helical. Small-angle X-ray scattering and multiangle laser light scattering experiments reveal that this soluble variant of PLB associates as a pentamer, preserving the oligomeric state of the natural protein. Mutations that destabilize native PLB also disrupt the pentamer. However, NMR experiments suggest that the redesigned protein exhibits molten globule-like properties, possibly because the redesign of the surface of this membrane protein may have altered some native contacts at the core of the protein or possibly because the core is not rigidly packed in wild-type PLB. Nonetheless, our success in converting the membrane protein PLB into a specific soluble helical pentamer indicates that the interior of a membrane protein contains at least some of the determinants necessary to dictate folding in an aqueous environment. The design we successfully used was based on one of the two models in the literature; the alternative design did not give stable, soluble pentamers. This suggests that surface redesign can be employed in gaining insights into the structures of membrane proteins." @default.
• W1980836191 created "2016-06-24" @default.
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• W1980836191 date "2001-05-10" @default.
• W1980836191 modified "2023-10-10" @default.
• W1980836191 title "Conversion of Phospholamban into a Soluble Pentameric Helical Bundle" @default.
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• W1980836191 doi "https://doi.org/10.1021/bi0026573" @default.
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