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Structural studies on membrane-bound bovine rhodopsin.

E Mullen, M Akhtar

    The Biochemical Journal
    |April 1, 1983
    PubMed
    Summary
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    Researchers identified the specific location of the retinal-binding site in bovine rhodopsin (a light-sensitive protein). This protein fragment analysis helps understand its structure and function.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Protein Chemistry

    Background:

    • Bovine rhodopsin is a G protein-coupled receptor crucial for vision.
    • Previous studies cleaved rhodopsin into three functional fragments (H, M, L) using papain.
    • These fragments are held together by non-covalent interactions.

    Purpose of the Study:

    • To isolate and characterize individual fragments of bovine rhodopsin.
    • To determine the precise location of the retinal-binding lysine residue within the M-fragment.
    • To investigate the structure and cleavage sites of the L-fragment, potentially identifying the cytoplasmic loop.

    Main Methods:

    • Preparative isolation of H, M, and L fragments based on chemical and physical differences.
    • Radiochemical labeling of the M-fragment at the retinal-binding site.

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  • Cyanogen bromide (CNBr) treatment of the labeled M-fragment.
  • Multi-step separation to isolate a retinyl peptide.
  • Sequence analysis of the retinyl peptide.
  • Isolation and analysis of the radiochemically labeled L-fragment.

    • Main Results:

    • The retinal-binding lysine residue was precisely located at position 296 from the N-terminus of rhodopsin (residue 53 from the C-terminus).
    • The L-fragment consists of two peptide populations.
    • Papain cleavage occurred at two specific sites within the L-fragment: between Lys-311 and Gln-312, and between Gln-312 and Phe-313.

    Conclusions:

    • The study successfully determined the exact location of the retinal-binding site in bovine rhodopsin.
    • The cleavage pattern of the L-fragment provides insights into the protein's structure and the location of the cytoplasmic loop between M and L fragments.
    • This detailed fragment analysis advances our understanding of rhodopsin's molecular architecture and function.