Journal of Cell Science, Vol 107, Issue 3 635-644, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

Sequence analysis of the Chlamydomonas alpha and beta dynein heavy chain genes

DR Mitchell and KS Brown
Department of Anatomy and Cell Biology, SUNY Health Science Center, Syracuse 13210.

We have sequenced genomic clones spanning the complete coding region of one heavy chain (beta) and the catalytic domain of a second (alpha) of the Chlamydomonas reinhardtii flagellar outer arm dynein ATPase. The beta heavy chain gene (ODA-4 locus) spans 20 kb, is divided into at least 30 exons, and encodes a predicted 520 kDa protein. Comparison with sea urchin beta dynein sequences reveals homology that extends throughout both proteins. Over the most conserved central catalytic region, the Chlamydomonas alpha and beta chains are equally divergent from the sea urchin beta chain (64% and 65% similarity, respectively), whereas the Chlamydomonas gamma chain is more divergent from urchin beta (54% similarity). The four glycine-rich loops identified as potential nucleotide-binding sites in other dynein heavy chains are also present in Chlamydomonas alpha and beta dyneins. Two of these four nucleotide-binding motifs are highly conserved among flagellar dyneins, but only the motif previously identified as the catalytic site in sea urchin dynein is highly conserved between flagellar and cytoplasmic dynein heavy chains. Predictions of secondary structure suggest that all dynein heavy chains possess three large domains, with the four nucleotide-binding consensus sequences located in a central 185 kDa domain that is bounded on both sides by regions that form multiple, short alpha-helical coiled-coils.
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