Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling

Lydia Nikolova, Kizhake Soman, Jeffry C. Nichols, D. Sundarsingh Daniel, Burton F. Dickey, Simon Hoffenberg

    Research output: Contribution to journalArticle

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    Abstract

    Tryptic proteolysis of the small GTPases Rab4 and Rab5 is a multi-step, nucleotide-dependent process. Using N-terminal peptide sequencing, matrix-assisted laser desorption ionization-time-of-flight MS and molecular modelling, we identified the three initial sites of proteolysis in Rab5 as Arg-4, Arg-81 and Arg-197, Arg-4 and Arg-81 lie within regions previously implicated in Rab5 endocytic function, and Arg-197 lies in a region involved in membrane targeting. Topologically, Arg-81 lies within the conformationally variable Switch II region shown to be important for protein-protein interactions of other GTPases. Homology modelling studies on Rab5 indicate that the Arg-81 side chain is buried in the Rab5 GTP conformation, but is solvent-accessible in the GDP conformation, explaining the dependence of proteolysis on nucleotides. Peptide mapping of Rab4 was performed to take advantage of additional scissile bonds within Switch II to determine more precisely the limits of the nucleotide-dependent protease-accessible region. The Rab4 cleavage sites corresponded to Arg-81 and Pro-87 of Rab5, and taken together with the finding that Rab5 was not cleaved at Arg-91 this analysis defines an eight-residue surface-exposed conformationally variable region lying in the centre of Switch II. A sequence comparison of Rab proteins shows these eight residues to have a loosely conserved motif that we term Switch II(v) for its relative variability. C-terminal to Switch II(v) is a highly conserved Rab-specific YYRGA motif that we term Switch II(c) for its constant sequence. N-terminal to Switch II(v) is a sequence-invariant G-domain involved in nucleotide binding and hydrolysis. We propose that the Rab Switch II(v) region imparts specificity to nucleotide-dependent protein-protein interactions.

    Original languageEnglish (US)
    Pages (from-to)461-469
    Number of pages9
    JournalBiochemical Journal
    Volume336
    Issue number2
    StatePublished - Dec 1 1998

    Fingerprint

    Proteolysis
    Membrane Proteins
    Nucleotides
    Switches
    Proteins
    Peptide Mapping
    Monomeric GTP-Binding Proteins
    GTP Phosphohydrolases
    Conformations
    Guanosine Triphosphate
    Lasers
    Hydrolysis
    Peptide Hydrolases
    Peptides
    Molecular modeling
    Membranes
    Ionization
    Desorption

    ASJC Scopus subject areas

    • Biochemistry

    Cite this

    Nikolova, L., Soman, K., Nichols, J. C., Daniel, D. S., Dickey, B. F., & Hoffenberg, S. (1998). Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling. Biochemical Journal, 336(2), 461-469.

    Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling. / Nikolova, Lydia; Soman, Kizhake; Nichols, Jeffry C.; Daniel, D. Sundarsingh; Dickey, Burton F.; Hoffenberg, Simon.

    In: Biochemical Journal, Vol. 336, No. 2, 01.12.1998, p. 461-469.

    Research output: Contribution to journalArticle

    Nikolova, L, Soman, K, Nichols, JC, Daniel, DS, Dickey, BF & Hoffenberg, S 1998, 'Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling', Biochemical Journal, vol. 336, no. 2, pp. 461-469.
    Nikolova L, Soman K, Nichols JC, Daniel DS, Dickey BF, Hoffenberg S. Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling. Biochemical Journal. 1998 Dec 1;336(2):461-469.
    Nikolova, Lydia ; Soman, Kizhake ; Nichols, Jeffry C. ; Daniel, D. Sundarsingh ; Dickey, Burton F. ; Hoffenberg, Simon. / Conformationally variable Rab protein surface regions mapped by limited proteolysis and homology modelling. In: Biochemical Journal. 1998 ; Vol. 336, No. 2. pp. 461-469.
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