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Caenorhabditis elegans Rab escort protein (REP-1) differently regulates each Rab protein function and localization in a tissue-dependent manner.

Genes Cells. 2008 Nov;13(11):1141-57
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摘要


Rab proteins play a critical role in intracellular vesicle trafficking and require post-translational modification by adding lipids at the C-terminus for proper functions. This modification is preceded by the formation of a trimeric protein complex with the Rab escort protein (REP) and the Rab geranylgeranyltransferase (RabGGTase). However, the genetic hierarchy among these proteins and the tissue-specificity of each protein function are not yet clearly understood. Here we identified the Caenorhabditis elegans rep-1 gene and found that a rep-1 mutant showed a mild defect in synaptic transmission and defecation behaviors. Genetic analyses using the exocytic Rab mutants rab-3 or rab-27 suggested that rep-1 functions only in the RAB-27 pathway, and not in the RAB-3 pathway, for synaptic transmission at neuromuscular junctions. However, the disruption of REP-1 did not cause defecation defects compared to severe defects in either RAB-27 or RabGGTase disruption, suggesting that REP-1 is not essential for RAB-27 signaling in defection. Some Rab proteins did not physically interact with REP-1, and localization of these Rab proteins was not severely affected by REP-1 disruption. These findings suggest that REP-1 functions are required in specific Rab pathways and in specific tissues, and that some Rab proteins are functionally prenylated without REP-1.

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