Tau Avoids the GTP Cap at Growing Microtubule Plus-Ends.
Tau Avoids the GTP Cap at Growing Microtubule Plus-Ends.
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DOI:
10.1016/j.isci.2020.101782
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发表时间:
2020-12-18
期刊:
影响因子:
5.8
通讯作者:
Odde DJ
中科院分区:
文献类型:
--
作者:
Castle BT;McKibben KM;Rhoades E;Odde DJ
Plus-end tracking proteins (+TIPs) associate with the growing end of microtubules and mediate important cellular functions. The majority of +TIPs are directed to the plus-end through a family of end-binding proteins (EBs), which preferentially bind the stabilizing cap of GTP-tubulin present during microtubule growth. One outstanding question is whether there may exist other microtubule-associated proteins (MAPs) that preferentially bind specific nucleotide states of tubulin. Here, we report that the neuronal MAP tau preferentially binds GDP-tubulin (KD = 0.26 μM) over GMPCPP-tubulin (KD = 1.1 μM) in vitro, as well as GTP-tubulin at the tips of growing microtubules, causing tau binding to lag behind the plus-end both in vitro and in live cells. Thus, tau is a microtubule tip avoiding protein, establishing the framework for a possible new class of tip avoiding MAPs. We speculate that disease-relevant tau mutations may exert their phenotype by their failure to properly recognize GDP-tubulin. Tau binds stronger to GDP-containing over GMPCPP-containing microtubules in vitro Tau preferentially binds the microtubule lattice over the tip in vitro and in cells Due to microtubule tip avoidance, tau primarily acts to inhibit shortening Optical Imaging; Molecular Biology Experimental Approach; Cellular Neuroscience
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影响因子:
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通讯作者:
Wadsworth, P
影响因子:
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Odde DJ
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Goodson, Holly V.
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