Lack of interaction of rhodopsin chromophore with membrane lipids. An electron-electron double resonance study using 14N:15N pairs.
Electron-electron double resonance (ELDOR) has been applied to the study of specific interactions of 15N-spin-labeled stearic acid with the retinal chromophore of a rhodopsin analogue containing a 14N spin-labeled retinal. Both the 5 and 16 spin-labeled stearic acids were incorporated into the lipid bilayer of rod outer segment membranes containing the spin-labeled pigment. No interaction between the 15N and 14N spin-labels was observed in rhodopsin or the metarhodopsin II state with either of these labeled stearic acids. Therefore in this system the ring portion of the chromophore must be highly sequestered from the phospholipid bilayer in both the rhodopsin and metarhodopsin II forms.
Renk
G E
GE
Department of Biochemistry, Medical University of South Carolina, Charleston 29425-2236.
Crouch
R K
RK
Feix
J B
JB
D000818:Animals; D002417:Cattle; D004578:Electron Spin Resonance Spectroscopy; D066298:In Vitro Techniques; D008563:Membrane Lipids / Q000502:physiology*; D010786:Photoreceptor Cells / Q000502:physiology*; D012168:Retinal Pigments / Q000502:physiology*; D012172:Retinaldehyde / Q000502:physiology*; D012176:Retinoids / Q000502:physiology*; D012243:Rhodopsin / Q000502:physiology*; D012374:Rod Cell Outer Segment / Q000502:physiology*; D013113:Spin Labels
D008563:Membrane Lipids; D012168:Retinal Pigments; D012176:Retinoids; D013113:Spin Labels; D012243:Rhodopsin; D012172:Retinaldehyde