Which of the following is NOT involved in vesicle uncoating?

Vesicle uncoating is a crucial process in the transport of proteins within cells, and it involves several proteins that facilitate the shedding of coat proteins that surround vesicles.

GAP (GTPase-activating proteins) play a critical role in the uncoating process by stimulating the hydrolysis of GTP, which is necessary for some of the coat proteins to disassemble. ATPases also contribute to vesicle uncoating by using energy from ATP hydrolysis to facilitate changes in the vesicle coat. GEF (guanine nucleotide exchange factors) are involved in activating GTP-binding proteins, which can indirectly influence the uncoating process by regulating the GTPase activity of proteins involved.

Rab effectors, on the other hand, are not directly involved in the uncoating of vesicles. Their primary function is to mediate the docking and fusion of vesicles with target membranes rather than assisting in the physical uncoating of the vesicle itself. Therefore, this option is not part of the uncoating process, making it the correct answer.