Mechanistic logic underlying the axonal transport of cytosolic proteins.

Mechanistic logic underlying the axonal transport of cytosolic proteins.
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DOI:
10.1016/j.neuron.2011.03.022
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发表时间:
2011-05-12
期刊:
影响因子:
16.2
通讯作者:
Roy S
Roy S
中科院分区:
医学1区
文献类型:
--
作者:
Scott DA;Das U;Tang Y;Roy S

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Proteins vital to presynaptic function are synthesized in the neuronal perikarya and delivered into synapses via two modes of axonal transport. While membrane-anchoring proteins are conveyed in fast axonal transport via motor-driven vesicles, cytosolic proteins travel in slow axonal transport; via mechanisms that are poorly understood. We found that in cultured axons, populations of cytosolic proteins tagged to photoactivable-GFP (PA-GFP) move with a slow motor-dependent anterograde bias; distinct from vesicular-trafficking or diffusion of untagged PA-GFP. The overall bias is likely generated by an intricate particle-kinetics involving transient assembly and short-range vectorial spurts. In-vivo biochemical studies reveal that cytosolic proteins are organized into higher-order structures within axon-enriched fractions that are largely segregated from vesicles. Data-driven biophysical modeling best predicts a scenario where soluble molecules dynamically assemble into mobile supra-molecular structures. We propose a model where cytosolic proteins are transported by dynamically assembling into multi-protein complexes that are directly/indirectly conveyed by motors.
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