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Roles of the Transducin a-Subunita4-Helix/ a4- b6Loopinthe Receptor and Effector Interactions

Show simple item record Natochin, M. Granovsky, A. E. Muradov, K. G. Artemyev, N. O. 2021-02-14T19:41:32Z 2021-02-14T19:41:32Z 1999
dc.description Roles of the Transducin a-Subunita4-Helix/a4-b6Loopinthe Receptor and Effector Interactions / M. Natochin, A. E. Granovsky, K. G. Muradov, N. O. Artemyev // The journal of biological chemistry : The American Society for Biochemistry and Molecular Biology. - 1999. - Vol. 274. - No. 12 (March 19). - Pp. 7865–7869. uk_UA
dc.description.abstract The visual GTP-binding protein, transducin, couples light-activated rhodopsin (R*) with the effector enzyme, cGMP phosphodiesterase in vertebrate photoreceptor cells. The region corresponding to the a4-helix and a4-b6 loopofthetransducina-subunit(Gta)hasbeen implicated in interactions with the receptor and the effector. Ala-scanning mutagenesis of the a4-b6 region has been carried out to elucidate residues critical for the functions of transducin. The mutational analysis supports the role of the a4-b6 loopinthe R-Gt ainterface and suggests that the Gta residues Arg and Asp are involved in the interaction with R*. These residues are likely to contribute to the specificity of the R* recognition. Contrary to the evidence previously obtained with synthetic peptides of Gta,our data indicatet hat none of the a4-b6 residues directly or significantly participate in the interaction with and activation of phosphodiesterase. However, Ile, Phe, and Leu form a network of interactions with the a3-helixofG ta, which is critical for the ability of Gt atoundergoanactivational conformational change. Thereby, Ile , Phe, and Leu play only an indirect role in the effector function of Gta. uk_UA
dc.language.iso en uk_UA
dc.title Roles of the Transducin a-Subunita4-Helix/ a4- b6Loopinthe Receptor and Effector Interactions uk_UA
dc.type Article uk_UA

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