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Ciliary Length Sensing Regulates IFT Entry via Changes in FLA8/KIF3B Phosphorylation to Control Ciliary Assembly
Yinwen Liang1, Xin Zhu1, Qiong Wu1
1MOE Key Laboratory of Protein Sciences, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, 100084 Beijing, China.
Current Biology : CB
|July 31, 2018
Summary
Cells control ciliary length by regulating intraflagellar transport (IFT) motor phosphorylation. This signaling pathway adjusts IFT entry, impacting flagellar assembly and maintaining precise ciliary dimensions.
Area of Science:
- Cell Biology
- Molecular Biology
- Biophysics
Background:
- Ciliary length is tightly regulated by cellular mechanisms.
- Intraflagellar transport (IFT) mediates ciliary assembly, with its rate decreasing as cilia elongate.
- Regulation of IFT entry is a potential mechanism for controlling ciliary length.
Purpose of the Study:
- To elucidate the molecular mechanism by which cells sense and control ciliary length.
- To investigate the role of FLA8/KIF3B phosphorylation in regulating ciliary assembly.
- To identify signaling pathways involved in ciliary length homeostasis.
Main Methods:
- Investigated ciliary length regulation in Chlamydomonas.
- Analyzed the phosphorylation status of the FLA8/KIF3B IFT motor subunit.
- Examined the impact of phosphatase depletion (CrPP1 and CrPP6) on FLA8 phosphorylation and ciliary length.
Main Results:
- Cellular signaling adjusts FLA8/KIF3B phosphorylation in response to ciliary length changes.
- Phosphorylated FLA8 (pFLA8) levels correlate directly with ciliary length.
- Depletion of CrPP1 and CrPP6 phosphatases increases pFLA8 and shortens cilia due to reduced IFT entry.
Conclusions:
- Ciliary length control is achieved through a sensing system that regulates IFT entry via phosphorylation of the anterograde IFT motor.
- Phosphorylation of FLA8/KIF3B acts as a key switch for controlling ciliary assembly and length.
- This mechanism ensures precise ciliary length homeostasis in response to cellular signals.
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