University of Pennsylvania ScholarlyCommons Publicly Accessible Penn Dissertations Spring 2010 Structural, Biochemical, and Cell Biological Characterization of Rab7 Mutants That Cause Peripheral Neuropathy Brett A. McCray University of Pennsylvania,
[email protected] Follow this and additional works at: https://repository.upenn.edu/edissertations Part of the Molecular and Cellular Neuroscience Commons Recommended Citation McCray, Brett A., "Structural, Biochemical, and Cell Biological Characterization of Rab7 Mutants That Cause Peripheral Neuropathy" (2010). Publicly Accessible Penn Dissertations. 145. https://repository.upenn.edu/edissertations/145 This paper is posted at ScholarlyCommons. https://repository.upenn.edu/edissertations/145 For more information, please contact
[email protected]. Structural, Biochemical, and Cell Biological Characterization of Rab7 Mutants That Cause Peripheral Neuropathy Abstract Coordinated trafficking of intracellular vesicles is of critical importance for the maintenance of cellular health and homeostasis. Members of the Rab GTPase family serve as master regulators of vesicular trafficking, maturation, and fusion by reversibly associating with distinct target membranes and recruiting specific effector proteins. Rabs act as molecular switches by cycling between an active, GTP-bound form and an inactive, GDP-bound form. The activity cycle is coupled to GTP hydrolysis and is tightly controlled by regulatory proteins such as guanine nucleotide exchange factors and GTPase activating proteins. Rab7 specifically regulates the trafficking and maturation of vesicle populations that are involved in protein degradation including late endosomes, lysosomes, and autophagic vacuoles. Missense mutations of Rab7 cause a dominantly-inherited axonal degeneration known as Charcot-Marie-Tooth type 2B (CMT2B) through an unknown mechanism. Patients with CMT2B present with length-dependent degeneration of peripheral sensory and motor neurons that leads to weakness and profound sensory loss.