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Purification and characterization from bovine brain cytosol of a novel regulatory protein inhibiting the dissociation of GDP from and the subsequent binding of GTP to rhoB p20, a ras p21-like GTP-binding protein.

Ueda, T, Kikuchi, A, Ohga, N, Yamamoto, J, Takai, Y·1990·Journal of Biological Chemistry
DOI 10.1016/s0021-9258(19)38859-3
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Abstract

A novel regulatory protein for the rho proteins (rhoA p21 and rhoB p20), belonging to a ras p21/ras p21-like small molecular weight (Mr) GTP-binding protein (G protein) superfamily, was purified to near homogeneity from bovine brain cytosol and characterized. This regulatory protein, designated here as GDP dissociation inhibitor (GDI) for the rho proteins (rho GDI), inhibited the dissociation of GDP from rhoB p20 and the binding of guanosine 5'-(3-O-thio)triphosphate (GTP gamma S) to the GDP-bound form of rhoB p20 but not of that to the guanine nucleotide-free form. The Mr value of rho GDI was estimated to be about 27,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and from the S value, indicating that rho GDI is composed of a single polypeptide without a subunit structure. The isoelectric point was about pH 5.7. rho GDI made a complex with the GDP-bound form of rhoB p20 with a molar ratio of 1:1 but not with the GTP gamma S-bound or guanine nucleotide-free form. rho GDI did not stimulate the GTPase activity of rhoB p20 and by itself showed neither GTP gamma S-binding nor GTPase activity. rho GDI was equally active for rhoA p21 and rhoB p20 but was inactive for other ras p21/ras p21-like G proteins including c-Ha-ras p21, smg p25A, and smg p21. rho GDI activity was detected in the cytosol fraction of various rat tissues. These results indicate that, in mammalian tissues, there is a novel type of regulatory protein specific for the rho proteins that interacts…

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Metadata

Authors
Ueda, T., Kikuchi, A., Ohga, N., Yamamoto, J., & Takai, Y.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1990-06
Volume
265
Issue
16
Pages
9373-9380
ISSN
0021-9258
DOI
10.1016/s0021-9258(19)38859-3
Cited by
218
References
1
Language
en
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CoChat. (2026). Citation check: Purification and characterization from bovine brain cytosol of a novel regulatory protein inhibiting the dissociation of GDP from and the subsequent binding of GTP to rhoB p20, a ras p21-like GTP-binding protein. https://app.cochat.ai/papers/10.1016/s0021-9258(19)38859-3
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Ueda, T., Kikuchi, A., Ohga, N., Yamamoto, J., & Takai, Y. (1990). Purification and characterization from bovine brain cytosol of a novel regulatory protein inhibiting the dissociation of GDP from and the subsequent binding of GTP to rhoB p20, a ras p21-like GTP-binding protein. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(19)38859-3