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Regional Differences in Microtubule Dynamics in the Axon

By Fridoon J. Ahmad, Thomas P. Pienkowski and Peter W. Baas


We have used an indirect method to compare the dynamic properties of microtubules (MTs) in the main shaft and distal regions of the axon. Individual MTs are staggered along the length of the axon and consist of a labile domain situated at the plus end of a stable domain (Baas and Black, 1990). As a result of this organization and the plus-end-distal orientation of axonal MTs, the most distal region of the axon consists entirely of labile domains, while the main shaft consists of a mixture of labile and stable domains. In this study, we wished to determine whether the labile domains extending into the distal axon differ in their dynamic properties from the labile domains terminating in the main shaft. To address this issue, we used immunoelectron microscopy to compare the tyrosination state of the labile domains terminating in these 2 axon regions. Because detyrosination is a polymerspecifi

Year: 1992
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