Membrane catalysis of peptide-receptor binding.
The membrane catalysis hypothesis states that a peptide ligand activates its target receptor after an initial interaction with the surrounding membrane. Upon membrane binding and interaction, the ligand is structured such that receptor binding and activation is encouraged. As evidence for this hypothesis, there are numerous studies concerning the conformation that peptides adopt in membrane mimetic environments. This mini-review analyzes the features of ligand peptides with an available high-resolution membrane-induced structure and a characterized membrane-binding region. At the peptide-membrane interface, both amphipathic helices and turn structures are commonly formed in peptide ligands and both hydrophobic and electrostatic interactions can be responsible for membrane binding. Apelin is the ligand to the G-protein coupled receptor (GPCR) named APJ, with various important physiological effects, which we have recently characterized both in solution and bound to anionic micelles. The structural changes that apelin undergoes when binding to micelles provide strong evidence for membrane catalysis of apelin-APJ interactions.
Langelaan
David N
DN
Department of Biochemistry & Molecular Biology, Dalhousie University, Tupper Medical Building, 5850 College Street, Halifax, NS B3H 1X5, Canada.
Rainey
Jan K
JK
D000818:Animals; D001665:Binding Sites; D055162:Biocatalysis; D002462:Cell Membrane / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000737:chemistry* / Q000378:metabolism; D008823:Micelles; D043562:Receptors, G-Protein-Coupled / Q000737:chemistry* / Q000378:metabolism
D036341:Intercellular Signaling Peptides and Proteins; D008823:Micelles; D043562:Receptors, G-Protein-Coupled
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