期刊
JOURNAL OF CELL BIOLOGY
卷 179, 期 3, 页码 515-526出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200703107
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- NIGMS NIH HHS [R01 GM066919, GM66919] Funding Source: Medline
For virtually all cilia and eukaryotic flagella, the second messengers calcium and cyclic adenosine monophosphate are implicated in modulating dynein-driven microtubule sliding to regulate beating. Calmodulin (CaM) localizes to the axoneme and is a key calcium sensor involved in regulating motility. Using immuno-precipitation and mass spectrometry, we identify members of a CaM-containing complex that are involved in regulating dynein activity. This complex includes flagellar-associated protein 91 (FAP91), which shares considerable sequence similarity to AAT-1, a protein originally identified in testis as an A-kinase anchor protein ( AKAP) binding protein. FAP91 directly interacts with radial spoke protein 3 ( an AKAP), which is located at the base of the spoke. In a microtubule sliding assay, the addition of antibodies generated against FAP91 to mutant axonemes with reduced dynein activity restores dynein activity to wild-type levels. These combined results indicate that the CaM- and spoke-associated complex mediates regulatory signals between the radial spokes and dynein arms.
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