Linkage of Retinal to Opsin View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1971-02

AUTHORS

ROBERT E. ANDERSON, ROSEMARY T. HOFFMAN, MICHAEL O. HALL

ABSTRACT

RHODOPSIN, the visual pigment of vertebrate rods, has been shown to consist of a chromophore (11-cis retinal) bound to a protein (opsin)1–2. It has been proposed that the linkage is a Schiff base between phosphatidyl ethanolaniine (PE) and retinal, and that when exposed to light, the retinal migrates from PE to the ε-amino-group of a lysine residue in opsin3–7. Most of the support for this theory comes from the observation that N-retinylidenephosphatidylethanolamine (N-RPE) can be extracted in the dark from rod outer segments (ROS)3,4. Furthermore, N-retinylphosphatidylethanolamine (N-RH2PE) has been extracted from ROS preparations after treating the visual pigment with acid and NaBH4—conditions which are assumed fix retinal to its “native” binding site through a secondary amine linkage7. All these studies, however, were carried out on crude extracts of ROS in various detergents. These crude extracts contain large amounts of phospholipid and retinal which is not bound to opsin. Thus, the isolation of N-RPE from crude ROS extracts does not necessarily point to its involvement in the binding of retinal to opsin. In contradiction to these reports are findings that purified visual pigment contains no phospholipid9,10 and that the molar concentration of N-RPE in bovine ROS is less than that of rhodopsin11. We have taken advantage of the observation that visual pigment in the outer segment disks is continually being renewed12 to label the rhodopsin with 3H-retinal and to show in yet another way that N-RPE does not exist in purified visual pigment. More... »

PAGES

249

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/newbio229249a0

DOI

http://dx.doi.org/10.1038/newbio229249a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003613473

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/5280274


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