Disruption of Rhodopsin Dimerization in Mouse Rod Photoreceptors by Synthetic Peptides Targeting Dimer Interface
Synthetic peptides derived from transmembrane segments of G protein-coupled receptors (GPCR) are used to disrupt GPCR dimer interface. This peptide competition technique is an effective approach to map the dimer interface of GPCR and its functional significance. Here we present a technique to deliver synthetic transmembrane peptides to living mouse rod photoreceptors to disrupt rhodopsin (a prototypical member of Class A GPCRs) dimer formation in the endoplasmic reticulum (ER). We have shown that rhodopsin helix H1- or H8-peptide caused mislocalization of rhodopsin to the perinuclear endoplasmic reticulum (ER).
Key wordsRhodopsin Cone opsin Rhodopsin dimer Dimerization Protein trafficking Peptide competition Dimer interface G protein-coupled receptor (GPCR) Rhodopsin helix peptides Nanoparticle delivery
We thank J. Chen for the S-opsin+ mouse line and the S-opsin antibody (MBO), W. Baehr for the Lrat –/– mouse line, J. Lem for the Rho –/– mouse line, and R.S. Molday for the 1D4 and 1D1 antibodies. Y.F. was supported by NIH grant EY022614, the Sarah Campbell Blaffer Endowment in Ophthalmolog, the E. Matilda Ziegler Foundation for the Blind, NIH core grant 2P30EY002520, and an unrestricted RPB grant to the Department of Ophthalmology at Baylor College of Medicine.