title: Opsin structure probed by raman spectroscopy of photoreceptor membranes.
abstract: The first nonresonance Raman spectra of photoreceptor membranes are presented. Information about the membrane protein, opsin, and the membrane phospholipids can be deduced. Opsin appears to contain alpha-helical structure but little beta structure. The tyrosine residues are predominantly hydrogen bonded, and disulfide bonds, if they are present, are not in the normal gauche-gauche configuration.
mesh_terms: D000818:Animals; D002417:Cattle; D007834:Lasers; D010743:Phospholipids; D010786:Photoreceptor Cells / Q000648:ultrastructure*; D012168:Retinal Pigments; D012542:Scattering, Radiation; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D010743:Phospholipids; D012168:Retinal Pigments