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    DC3, the smallest subunit of the Chlamydomonas flagellar outer dynein arm-docking complex, is a redox-sensitive calcium-binding protein

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    Authors
    Casey, Diane M.
    Yagi, Toshiki
    Kamiya, Ritsu
    Witman, George B.
    UMass Chan Affiliations
    Department of Cell Biology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    2003-08-16
    Keywords
    Amino Acid Motifs; Amino Acid Substitution; Animals; Calcium; Calcium-Binding Proteins; Chlamydomonas; Dynein ATPase; Flagella; Magnesium; Mutagenesis, Site-Directed; Oxidation-Reduction; Protein Subunits; Protozoan Proteins; Swimming
    Life Sciences
    Medicine and Health Sciences
    
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    Link to Full Text
    http://dx.doi.org/10.1074/jbc.M303064200
    Abstract
    The outer dynein arm-docking complex (ODA-DC) targets the outer dynein arm to its correct binding site on the flagellar axoneme. The Chlamydomonas ODA-DC contains three proteins; loss of any one prevents normal assembly of the outer arm, leading to a slow, jerky swimming phenotype. We showed previously that the smallest ODA-DC subunit, DC3, has four EF-hands (Casey, D. M., Inaba, K., Pazour, G. J., Takada, S., Wakabayashi, K., Wilkerson, C. G., Kamiya, R., and Witman, G. B. (2003) Mol. Biol. Cell 14, 3650-3663). Two of the EF-hands fit the consensus pattern for calcium binding, and one of these contains two cysteine residues within its binding loop. To determine whether the predicted EF-hands are functional, we purified bacterially expressed wild-type DC3 and analyzed its calcium-binding potential in the presence and absence of dithiothreitol and Mg2+. The protein bound one calcium ion with an affinity (Kd) of approximately 1 x 10-5 m. Calcium binding was observed only in the presence of dithiothreitol and thus is redox-sensitive. DC3 also bound Mg2+ at physiological concentrations but with a much lower affinity. Changing the essential glutamate to glutamine in both EF-hands eliminated the calcium binding activity of the bacterially expressed protein. To investigate the role of the EF-hands in vivo, we transformed the modified DC3 gene into a Chlamydomonas insertional mutant lacking DC3. The transformed strain swam normally, assembled a normal number of outer arms, and had a normal photoshock response, indicating that the Glu to Gln mutations did not affect ODA-DC assembly, outer arm assembly, or Ca2+-mediated outer arm activity. Thus, DC3 is a true calcium-binding protein, but the function of this activity remains unknown.
    Source
    J Biol Chem. 2003 Oct 24;278(43):42652-9. Epub 2003 Aug 14. Link to article on publisher's site
    DOI
    10.1074/jbc.M303064200
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/33343
    PubMed ID
    12920131
    Related Resources
    Link to article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1074/jbc.M303064200
    Scopus Count
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    Morningside GSBS Scholarly Publications
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