期刊论文详细信息
eLife
Chlamydomonas ARMC2/PF27 is an obligate cargo adapter for intraflagellar transport of radial spokes
Pinfen Yang1  Yi Liu1  Rama A Alkhofash2  Jin Dai2  Jack Butler2  Karl F Lechtreck2  Lea Alford3 
[1] Department of Biological Sciences, Marquette University, Milwaukee, United States;Department of Cellular Biology, University of Georgia, Athens, United States;Division of Natural Sciences,, Oglethorpe University, Atlanta, United States;
关键词: intraflagellar transport;    cilia;    radial spoke;    Chlamydomonas reinhardtii;   
DOI  :  10.7554/eLife.74993
来源: eLife Sciences Publications, Ltd
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【 摘 要 】

Intraflagellar transport (IFT) carries proteins into flagella but how IFT trains interact with the large number of diverse proteins required to assemble flagella remains largely unknown. Here, we show that IFT of radial spokes in Chlamydomonas requires ARMC2/PF27, a conserved armadillo repeat protein associated with male infertility and reduced lung function. Chlamydomonas ARMC2 was highly enriched in growing flagella and tagged ARMC2 and the spoke protein RSP3 co-migrated on anterograde trains. In contrast, a cargo and an adapter of inner and outer dynein arms moved independently of ARMC2, indicating that unrelated cargoes distribute stochastically onto the IFT trains. After concomitant unloading at the flagellar tip, RSP3 attached to the axoneme whereas ARMC2 diffused back to the cell body. In armc2/pf27 mutants, IFT of radial spokes was abolished and the presence of radial spokes was limited to the proximal region of flagella. We conclude that ARMC2 is a cargo adapter required for IFT of radial spokes to ensure their assembly along flagella. ARMC2 belongs to a growing class of cargo-specific adapters that enable flagellar transport of preassembled axonemal substructures by IFT.

【 授权许可】

CC BY   

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