Abstract：
:Neuronal microtubules support intracellular transport, facilitate axon growth, and form a basis for neuronal morphology. While microtubules in nonneuronal cells are depolymerized by cold, Ca(2+), or antimitotic drugs, neuronal microtubules are unusually stable. Such stability is important for normal axon growth and maintenance, while hyperstability may compromise neuronal function in aging and degeneration. Though mechanisms for stability are unclear, studies suggest that stable microtubules contain biochemically distinct tubulins that are more basic than conventional tubulins. Transglutaminase-catalyzed posttranslational incorporation of polyamines is one of the few modifications of intracellular proteins that add positive charges. Here we show that neuronal tubulin can be polyaminated by transglutaminase. Endogenous brain transglutaminase-catalyzed polyaminated tubulins have the biochemical characteristics of neuronal stable microtubules. Inhibiting polyamine synthesis or transglutaminase activity significantly decreases microtubule stability in vitro and in vivo. Together, these findings suggest that transglutaminase-catalyzed polyamination of tubulins stabilizes microtubules essential for unique neuronal structures and functions.
journal_name
Neuronjournal_title
Neuronauthors
Song Y,Kirkpatrick LL,Schilling AB,Helseth DL,Chabot N,Keillor JW,Johnson GV,Brady STdoi
10.1016/j.neuron.2013.01.036subject
Has Abstractpub_date
2013-04-10 00:00:00pages
109-23issue
1eissn
0896-6273issn
1097-4199pii
S0896-6273(13)00132-3journal_volume
78pub_type
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