Preferential binding of a kinesin-1 motor to GTP-tubulin-rich microtubules underlies polarized vesicle transport

Takao Nakata, Shinsuke Niwa, Yasushi Okada, Franck Perez, Nobutaka Hirokawa

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

Polarized transport in neurons is fundamental for the formation of neuronal circuitry. A motor domain- containing truncated KIF5 (a kinesin-1) recognizes axonal microtubules, which are enriched in EB1 binding sites, and selectively accumulates at the tips of axons. However, it remains unknown what cue KIF5 recognizes to result in this selective accumulation. We found that axonal microtubules were preferentially stained by the anti-GTP-tubulin antibody hMB11. Super-resolution microscopy combined with EM immunocytochemistry revealed that hMB11 was localized at KIF5 attachment sites. In addition, EB1, which binds preferentially to guanylylmethylene-diphosphate (GMPCPP) microtubules in vitro, recognized hMB11 binding sites on axonal microtubules. Further, expression of hMB11 antibody in neurons disrupted the selective accumulation of truncated KIF5 in the axon tips. In vitro studies revealed approximately threefold stronger binding of KIF5 motor head to GMPCPP microtubules than to GDP microtubules. Collectively, these data suggest that the abundance of GTP-tubulin in axonal microtubules may underlie selective KIF5 localization and polarized axonal vesicular transport.

Original languageEnglish
Pages (from-to)245-255
Number of pages11
JournalJournal of Cell Biology
Volume194
Issue number2
DOIs
Publication statusPublished - 2011 Jul 25
Externally publishedYes

ASJC Scopus subject areas

  • Cell Biology

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