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First published online 28 April 2009
doi: 10.1242/jcs.044651

Journal of Cell Science 122, 1691-1699 (2009)
Published by The Company of Biologists 2009
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Research Article

Ancient Leishmania coronin (CRN12) is involved in microtubule remodeling during cytokinesis

Amogh A. Sahasrabuddhe, Ramesh C. Nayak and Chhitar M. Gupta*

Division of Molecular and Structural Biology, Central Drug Research Institute, M.G. Marg, Lucknow 226001, India

* Author for correspondence (e-mail: drcmg{at}rediffmail.com)

Accepted 10 February 2009

In general, coronins play an important role in actin-based processes, and are expressed in a variety of eukaryotic cells, including Leishmania. Here, we show that Leishmania coronin preferentially distributes to the distal tip during cytokinesis, and interacts with microtubules through a microtubule-based motor, kinesin K39. We further show that reduction in coronin levels by 40-50% in heterozygous coronin mutants results in generation of bipolar cells (25-30%), specifically in the log phase, owing to unregulated growth of the corset microtubules. Further analysis of bipolar cells revealed that the main cause of generation of bipolar cell morphology is the intrusion of the persistently growing corset microtubules into the other daughter cell corset from the opposite direction. This defect in cytokinesis, however, disappears upon episomal gene complementation. Additionally, our attempts to prepare homozygous mutants were unsuccessful, as only the aneuploid cells survive the selection process. These results indicate that coronin regulates microtubule remodeling during Leishmania cytokinesis and is essentially required for survival of these parasites in culture.

Key words: Trypanosomatids, Cytokinesis, Coronin, Microtubule remodeling


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