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• W1587723748 abstract "ras p21 GTPase-activating protein (GAP) has been proposed to interact with the putative effector domain of ras p21s, and smg p21, a ras p21-like guanine nucleotide binding protein (G protein), has been shown to have the same amino acid sequence as ras p21s in this region. In the present studies, we examined the effects of ras p21 GAP on the GTPase activity of smg p21 purified from human platelets, of smg p21 on the ras p21 GAP-stimulated GTPase activity of c-Ha-ras p21 purified from Escherichia coli, and of c-Ha-ras p21 on the smg p21 GAP1- or -2-stimulated GTPase activity of smg p21. ras p21 GAP stimulated the GTPase activity of c-Ha-ras p21 but not that of smg p21. The GTP-bound form of smg p21, however, inhibited the ras p21 GAP-stimulated GTPase activity of c-Ha-ras p21 in a dose-dependent manner. The half-maximum inhibition by smg p21 was obtained at 0.4 microM which was more potent than previously observed for ras p21 (2-200 microM). The GDP-bound form also inhibited the ras p21 GAP-stimulated GTPase activity of c-Ha-ras p21, but the efficiency was 40-50% that of the GTP-bound form. smg p21 GAP1 and -2 stimulated the GTPase activity of smg p21 but not that of c-Ha-ras p21. c-Ha-ras p21 did not inhibit the smg p21 GAP1- or -2-stimulated GTPase activity of smg p21. These results indicate that ras p21 GAP interacts with smg p21 without the subsequent stimulation of its GTPase activity." @default.
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• W1587723748 date "1990-05-01" @default.
• W1587723748 modified "2023-09-29" @default.
• W1587723748 title "Inhibition of the ras p21 GTPase-activating protein-stimulated GTPase activity of c-Ha-ras p21 by smg p21 having the same putative effector domain as ras p21s." @default.
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• W1587723748 doi "https://doi.org/10.1016/s0021-9258(19)39083-0" @default.
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