Identification of a novel family of 70 kDa microtubule-associated proteins in Arabidopsis cells

Andrey V. Korolev, Jordi Chan, Mike J. Naldrett, John H. Doonan, Clive W. Lloyd

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Most plant microtubule-associated proteins (MAPs) have homologues across the phylogenetic spectrum. To find potential plant-specific MAPs that will have evaded bioinformatic searches we devised a low stringency method for isolating proteins from an Arabidopsis cell suspension on endogenous taxol-microtubules. By tryptic peptide mass fingerprinting we identified 55 proteins that were enriched on taxol-microtubules. Amongst a range of known MAPs, such as kinesins, MAP65 isoforms and MOR1, we detected 'unknown' 70 kDa proteins that belong to a family of five closely related Arabidopsis proteins having no known homologues amongst non-plant organisms. To verify that AtMAP70-1 associates with microtubules in vivo, it was expressed as a GFP fusion. This confirmed that the protein decorates all four microtubule arrays in both transiently infected Arabidopsis and stably transformed tobacco BY-2 suspension cells. Microtubule-directed drugs perturbed the localization of AtMAP70-1 but cytochalasin D did not. AtMAP70-1 contains four predicted coiled-coil domains and truncation studies identified a central domain that targets the fusion protein to microtubules in vivo. This study therefore introduces a novel family of plant-specific proteins that interact with microtubules.

Original languageEnglish (US)
Pages (from-to)547-555
Number of pages9
JournalPlant Journal
Volume42
Issue number4
DOIs
StatePublished - May 2005

Keywords

  • Arabidopsis
  • GATEWAY
  • Microtubule-associated proteins
  • Proteomics

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

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