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Projection structure of frog rhodopsin in two crystal forms.

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Projection structure of frog rhodopsin in two crystal forms.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Schertler, G. F. Hargrave, P. A.
Description	Author Affiliation: Schertler GF ( Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom.);
Abstract	Rhodopsin is the G protein-coupled receptor that upon light activation triggers the visual transduction cascade. Rod cell outer segment disc membranes were isolated from dark-adapted frog retinas and were extracted with Tween detergents to obtain two-dimensional rhodopsin crystals for electron crystallography. When Tween 80 was used, tubular structures with a p2 lattice (a = 32 A, b = 83 A, gamma = 91 degrees) were formed. The use of a Tween 80/Tween 20 mixture favored the formation of larger p22(1)2(1) lattices (a = 40 A, b = 146 A, gamma = 90 degrees). Micrographs from frozen hydrated frog rhodopsin crystals were processed, and projection structures to 7-A resolution for the p22(1)2(1) form and to 6-A resolution for the p2 form were calculated. The maps of frog rhodopsin in both crystal forms are very similar to the 9-A map obtained previously for bovine rhodopsin and show that the arrangement of the helices is the same. In a tentative topographic model, helices 4, 6, and 7 are nearly perpendicular to the plane of the membrane. In the higher-resolution projection maps of frog rhodopsin, helix 5 looks more tilted than it appeared previously. The quality of the two frog rhodopsin crystals suggests that they would be suitable to obtain a three-dimensional structure in which all helices would be resolved.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	25
Volume Number	92
Language	English
Publisher	National Academy of Sciences
Publisher Date	1995-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Protein Structure, Secondary Protein Structure, Tertiary Rhodopsin Chemistry Animals Anura Bacteriorhodopsins Crystallography Electrons Image Processing, Computer-Assisted Rod Cell Outer Segment Species Specificity Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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