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      FLA8/KIF3B phosphorylation regulates kinesin-II interaction with IFT-B to control IFT entry and turnaround.

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          Abstract

          The assembly and maintenance of cilia depends on intraflagellar transport (IFT). Activated IFT motor kinesin-II enters the cilium with loaded IFT particles comprising IFT-A and IFT-B complexes. At the ciliary tip, kinesin-II becomes inactivated, and IFT particles are released. Moreover, the rate of IFT entry is dynamically regulated during cilium assembly. However, the regulatory mechanism of IFT entry and loading/unloading of IFT particles remains elusive. We show that the kinesin-II motor subunit FLA8, a homolog of KIF3B, is phosphorylated on the conserved S663 by a calcium-dependent kinase in Chlamydomonas. This phosphorylation disrupts the interaction between kinesin-II and IFT-B, inactivates kinesin-II and inhibits IFT entry, and is also required for IFT-B unloading at the ciliary tip. Furthermore, our data suggest that the IFT entry rate is controlled by regulation of the cellular level of phosphorylated FLA8. Therefore, FLA8 phosphorylation acts as a molecular switch to control IFT entry and turnaround.

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          Author and article information

          Journal
          Dev. Cell
          Developmental cell
          1878-1551
          1534-5807
          Sep 8 2014
          : 30
          : 5
          Affiliations
          [1 ] MOE Key Laboratory of Protein Science, Tsinghua University, Beijing 100084, China; School of Life Sciences, Tsinghua University, Beijing 100084, China.
          [2 ] School of Life Sciences, Tsinghua University, Beijing 100084, China.
          [3 ] MOE Key Laboratory of Protein Science, Tsinghua University, Beijing 100084, China; School of Life Sciences, Tsinghua University, Beijing 100084, China. Electronic address: panjunmin@tsinghua.edu.cn.
          Article
          S1534-5807(14)00485-7
          10.1016/j.devcel.2014.07.019
          25175706
          Copyright © 2014 Elsevier Inc. All rights reserved.

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