These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Orientation of retinal in bacteriorhodopsin as studied by cross-linking using a photosensitive analog of retinal.
    Author: Huang KS, Radhakrishnan R, Bayley H, Khorana HG.
    Journal: J Biol Chem; 1982 Nov 25; 257(22):13616-23. PubMed ID: 7142168.
    Abstract:
    The photosensitive m-diazirinophenyl analog of retinal (Fig. 1, II) bound to bacterio-opsin at Lys-216 and regenerated a chromophore with lambda max at 470 nm. Photolysis of the complex at 365 nm resulted in covalent cross-linking of the retinal analog to the bacterio-opsin in greater 30% yield. Investigation of the sites of cross-linking between the 3H-labeled retinal analog and the protein showed the peptide fragment (amino acid residues 190-248) to be the main radioactively labeled product. Stepwise Edman degradation showed Ser-193 and Glu-194 to be the predominant sites of cross-linking. These results show that the chromophore in bacteriorhodopsin is inclined towards helix 6 and towards the exterior of the cell. These data also provide information on the approximate angle that the chromophore makes with the plane of the membrane and they require a modification of the current secondary structure model for bacteriorhodopsin.
    [Abstract] [Full Text] [Related] [New Search]