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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Kinesin-2 differentially regulates the anterograde axonal transports of acetylcholinesterase and choline acetyltransferase in Drosophila.

Choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) are involved in acetylcholine synthesis and degradation at pre- and postsynaptic compartments, respectively. Here we show that their anterograde transport in Drosophila larval ganglion is microtubule-dependent and occurs in two different time profiles. AChE transport is constitutive while that of ChAT occurs in a brief pulse during third instar larva stage. Mutations in the kinesin-2 motor subunit Klp64D and separate siRNA- mediated knock-outs of all the three kinesin-2 subunits disrupt the ChAT and AChE transports, and these antigens accumulate in discrete nonoverlapping punctae in neuronal cell bodies and axons. Quantification analysis further showed that mutations in Klp64D could independently affect the anterograde transport of AChE even before that of ChAT. Finally, ChAT and AChE were coimmunoprecipitated with the kinesin-2 subunits but not with each other. Altogether, these suggest that kinesin-2 independently transports AChE and ChAT within the same axon. It also implies that cargo availability could regulate the rate and frequency of transports by kinesin motors.[1]


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