Work

A CDK-related kinase regulates the length and assembly of flagella in Chlamydomonas

Year: 2007

Type: article

Abstract: Little is known about how cells regulate the size of their organelles. In this study, we find that proper flagellar length control in Chlamydomonas reinhardtii requires the activity of a new member of the cyclin-dependent kinase (CDK) family, which is encoded by the LF2 (long flagella 2) gene. This novel CDK contains all of the important residues that are essential for kinase activity but lacks the cyclin-binding motif PSTAIRE. Analysis of genetic lesions in a series of lf2 mutant alleles and site-directed mutagenesis of LF2p reveals that improper flagellar length and defective flagellar assembly correlate with the extent of disruption of conserved kinase structures or residues by mutations. LF2p appears to interact with both LF1p and LF3p in the cytoplasm, as indicated by immunofluorescence localization, sucrose density gradients, cell fractionation, and yeast two-hybrid experiments. We propose that LF2p is the catalytic subunit of a regulatory kinase complex that controls flagellar length and flagellar assembly.

Source: The Journal of Cell Biology

DOI: 10.1083/jcb.200610022

Authors: Lai-Wa Tam, Nedra F. Wilson, Paul A. Lefebvre

Institutions: University of Minnesota, Oklahoma State University Center for Health Sciences

Language: English

Topic: Genetic and Kidney Cyst Diseases

Subfield: Genetics

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: green

Funder: National Institute of General Medical Sciences

Awards: G228852876, Regulation of Flagellar Assembly in Chlamydomonas