Question

how does the gtp - bound form of a gtp - binding protein switch to a gdp - bound form? choose one: a. it hydrolyzes gtp, releasing a phosphate. b. it releases gtp and takes up gdp from the cytosol. c. it interacts with a phosphatase, which removes a phosphate from gtp. d. it releases gtp and takes up gdp from the mitochondrion. e. in the presence of high concentrations of gdp, it trades gtp for gdp.

Explanation:

GTP - binding proteins switch from the GTP - bound form to the GDP - bound form by hydrolyzing GTP. Hydrolysis of GTP involves the breaking of a phospho - anhydride bond in GTP, releasing a phosphate group. This is a common regulatory mechanism for these proteins.

Answer:

A. It hydrolyzes GTP, releasing a phosphate.