Abstract
Rab GTPases are key regulators of membrane trafficking. When GTP-bound, or “active,” Rabs are anchored to membranes and recruit effector proteins that mediate vesicle formation, transport, and fusion. Rabs are inactivated by GTPase-activating proteins (Rab-GAPs), which catalyze GTP hydrolysis, rendering Rabs cytosolic. In vivo, C-terminal prenylation modifications link activated Rabs to organelle and vesicle membranes, yet historically, in vitro Rab-GAP activity assays have been performed in the absence of membranes. We have developed a method for assaying Rab-GAP activity in a physiological context, with dissociation of the Rab from the membrane serving as a readout for Rab-GAP activity. Given that membrane-binding status is a key consequence of Rab activation state, this assay will be useful for the study of a wide range of Rab/Rab-GAP pairs.
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Change history
11 February 2023
The original version of the book was inadvertently published without incorporating the author’s proof corrections mentioned below. The chapters have now been corrected and approved by the author.
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Author Contributions
C.M.H.: Writing (original draft; review and editing), Methodology (optimization), Investigation, Funding acquisition. L.L.T.: Writing (review and editing), Methodology (conceptualization, optimization), Investigation. J.C.F. Writing (review and editing), Methodology (conceptualization), Funding acquisition, Supervision.
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Highland, C.M., Thomas, L.L., Fromme, J.C. (2023). Methods for Studying Membrane-Proximal GAP Activity on Prenylated Rab GTPase Substrates. In: Wang, Y., Lupashin, V.V., Graham, T.R. (eds) Golgi. Methods in Molecular Biology, vol 2557. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2639-9_29
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DOI: https://doi.org/10.1007/978-1-0716-2639-9_29
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