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J. Biol. Chem., Vol. 282, Issue 8, 5404-5412, February 23, 2007

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Chlamydomonas Flagellar Outer Row Dynein Assembly Protein Oda7 Interacts with Both Outer Row and I1 Inner Row Dyneins^*

From the Department of Cell and Developmental Biology, State University of New York Upstate Medical University, Syracuse, New York 13210

We previously found that a mutation at the ODA7 locus in Chlamydomonas prevents axonemal outer row dynein assembly by blocking association of heavy chains and intermediate chains in the cytoplasm. We have now cloned the ODA7 locus by walking in the Chlamydomonas genome from nearby molecular markers, confirmed the identity of the gene by rescuing the mutant phenotype with genomic clones, and identified the ODA7 gene product as a 58-kDa leucine-rich repeat protein unrelated to outer row dynein LC1. Oda7p is missing from oda7 mutant flagella but is present in flagella of other outer row or inner row dynein assembly mutants. However, Oda7 levels are greatly reduced in flagella that lack both outer row dynein and inner row I1 dynein. Biochemical fractionation and rebinding studies support a model in which Oda7 participates in a previously uncharacterized structural link between inner and outer row dyneins.

Received for publication, August 7, 2006 , and in revised form, October 18, 2006.

The nucleotide sequence(s) reported in this paper has been submitted to the DDBJ/GenBank^TM/EBI Data Bank with accession number(s) DQ886489 [GenBank] .

^* This work was supported by National Institutes of Health Grant GM44228 (to D. R. M.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

The on-line version of this article (available at http://www.jbc.org) contains supplemental Figs. S1–S3.

¹ Present address: Dept. of Biology, Emory University, Atlanta, GA 30322.

² To whom correspondence should be addressed: Dept. of Cell and Developmental Biology, 1133 WH, SUNY Upstate Medical University, 750 E. Adams St., Syracuse, NY 13210. Tel.: 315-464-8575; Fax: 315-464-8535; E-mail: mitcheld{at}upstate.edu.

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