Katanin Knockdown Supports a Role for Microtubule Severing in Release of Basal Bodies Before Mitosis in Chlamydomonas

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2008 Nov 14

PMID 19005222

Citations 30

Authors

M Qasim Rasi

Jeremy D K Parker

Jessica L Feldman

Wallace F Marshall

Lynne M Quarmby

Affiliations

Soon will be listed here.

Abstract

Katanin is a microtubule-severing protein that participates in the regulation of cell cycle progression and in ciliary disassembly, but its precise role is not known for either activity. Our data suggest that in Chlamydomonas, katanin severs doublet microtubules at the proximal end of the flagellar transition zone, allowing disengagement of the basal body from the flagellum before mitosis. Using an RNA interference approach we have discovered that severe knockdown of the p60 subunit of katanin, KAT1, is achieved only in cells that also carry secondary mutations that disrupt ciliogenesis. Importantly, we observed that cells in the process of cell cycle-induced flagellar resorption sever the flagella from the basal bodies before resorption is complete, and we find that this process is defective in KAT1 knockdown cells.

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