Abstract
TRANSDUCIN, composed of subunits Tα, Tβ and Tγ, is a member of a heterotrimeric G-protein family, and transduces the light signal in visual cells. We have recently found that bovine Tβγ can be separated into two components, Tβγ-1 and Tβγ-2, each of which has its own γ-subunit, Tγ-1 and Tγ-2, respectively1. Tβγ-2 enhances the binding of GTP to Tα in the presence of metarhodopsin II by about 30-fold compared with Tβγ-1 (ref. 1). Here we show that a farnesyl moiety is attached to a sulphur atom of the C-terminal cysteine of Tγ-2 (active form), a part of which is additionally methyl-esterified at the α-carboxyl group. In Tγ-1 (inactive form), however, such modifications are missing. Thus, the farnesyl moiety attached to the γ-subunit is indispensable for the GTP-binding activity of transducin. This suggests that a similar modification may occur in the γ-subunits of other heterotrimeric G proteins involved in biological signal transduction processes.
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Fukada, Y., Ohguro, H., Saito, T., Yoshizawa, T. & Akino, T. J. biol. Chem. 264, 5937–5943 (1989).
Hurley, J. B., Fong, H. K. W., Teplow, D. B., Dreyer, W. J. & Simon, M. I. Proc. natn. Acad. Sci. U.S.A. 81, 6948–6952 (1984).
Yatsunami, K., Pandya, B. V., Oprian, D. D. & Khorana, H. G. Proc. natn. Acad. Sci. U.S.A. 82, 1936–1940 (1985).
McConnell, D. G., Kohnken, R. E. & Smith, A. J. Fedn Proc. 43, 1585 (1984).
Ovchinnikov, Y. A., Lipkin, V. M., Shuvaeva, T. M., Bogachuk, A. P. & Shemyakin, V. V. FEBS Lett. 179, 107–110 (1985).
Farnsworth, C. C., Wolda, S. L., Gelb, M. H. & Glomset, J. A. J. biol. Chem. 264, 20422–20429 (1989).
Hancock, J. F., Magee, A. I., Childs, J. E. & Marshall, C. J. Cell 57, 1167–1177 (1989).
Casey, P. J., Solski, P. A., Der, C. J. & Buss, J. E. Proc. natn. Acad. Sci. U.S.A. 86, 8323–8327 (1989).
Schafer, W. R. et al. Science, 245, 379–385 (1989).
Chelsky, D., Olson, J. F. & Koshland, D. E. Jr. J. biol. Chem. 262, 4303–4309 (1987).
Clarke, S., Vogel, J. P., Deschenes, R. J. & Stock, J. Proc. natn. Acad. Sci. U.S.A. 85, 4643–4647 (1988).
Deschenes, R. J., Stimmel, J. B., Clarke, S., Stock, J. & Broach, J. R. J. biol. Chem. 264, 11865–11873 (1989).
Fung, B. K.-K., Yamane, H. K., Ota, I. M. & Clarke, S. FEBS Lett., 260, 313–317 (1990).
Ota, I. M. & Clarke, S. J. biol. Chem. 264, 12879–12884 (1989).
Ohguro, H., Fukada, Y., Yoshizawa, T., Saito, T. & Akino, T. Biochem. biophys. Res. Commun. 167, 1235–1241 (1990).
Hermodson, M. A., Ericsson, L. H., Neurath, H. & Walsh, K. A. Biochemistry 12, 3146–3153 (1973).
Kikuchi, M., Taniyama, Y., Kanaya, S., Takao, T. & Shimonishi, Y. Eur. J. Biochem. 187, 315–320 (1990).
Rüegg, R. et al. Helv. chim. Acta 42, 2616–2621 (1959).
Kitada, C. et al. Experientia 35, 1275–1276 (1979).
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Fukada, Y., Takao, T., Ohguro, H. et al. Farnesylated γ-subunit of photoreceptor G protein indispensable for GTP-binding. Nature 346, 658–660 (1990). https://doi.org/10.1038/346658a0
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DOI: https://doi.org/10.1038/346658a0
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