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. 1997;37(2):120-6.
doi: 10.1002/(SICI)1097-0169(1997)37:2<120::AID-CM4>3.0.CO;2-C.

Sequence Analysis of the Chlamydomonas Reinhardtii Flagellar Alpha Dynein Gene

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Sequence Analysis of the Chlamydomonas Reinhardtii Flagellar Alpha Dynein Gene

D R Mitchell et al. Cell Motil Cytoskeleton. .

Abstract

Flagellar outer row dynein ATPases have been used extensively as model systems for studies of microtubule-based motility. Previously full-length sequences were only available for two of the three catalytic heavy-chain subunits (DHCs) of this enzyme. We have completed the sequence of an 18-kb genomic region encoding the Chlamydomonas reinhardtii flagellar outer row dynein alpha heavy chain. Unlike the beta- and gamma-subunits, DHC alpha is not required for assembly of other outer row dynein proteins, except for a tightly associated light chain, and thus occupies a unique position within this enzyme complex. The predicted 4,499 residue protein retains sequence homology to other dynein heavy chains throughout its central and C-terminal regions but lacks homology to any other dyneins in the first 1,000 amino acids, which may account for its unusual assembly properties. This N-terminal domain of DHC alpha contains a repetitive sequence rich in alanines, prolines, and glutamic acids. Within the more homologous C-terminal region, which includes the catalytic domain, three short sequences unique to DHC alpha may account for its specific catalytic properties and in vivo phosphorylation pattern.

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