Spatial regulation of the polarity kinase PAR-1 by parallel inhibitory mechanisms

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Abstract

The MARK/PAR-1 family of kinases are conserved regulators of cell polarity that share a conserved C-terminal kinase-associated domain (KA1). Localization of MARK/PAR-1 kinases to specific regions of the cell cortex is a hallmark of polarized cells. In Caenorhabditis elegans zygotes, PAR-1 localizes to the posterior cortex under the influence of another polarity kinase, aPKC/PKC-3. Here, we report that asymmetric localization of PAR-1 protein is not essential, and that PAR-1 kinase activity is regulated spatially. We find that, as in human MARK1, the PAR-1 KA1 domain is an auto-inhibitory domain that suppresses kinase activity. Auto-inhibition by the KA1 domain functions in parallel with phosphorylation by PKC-3 to suppress PAR-1 activity in the anterior cytoplasm. The KA1 domain also plays an additional role that is essential for germ plasm maintenance and fertility. Our findings suggest that modular regulation of kinase activity by redundant inhibitory inputs contributes to robust symmetry breaking by MARK/PAR-1 kinases in diverse cell types.

Original languageEnglish (US)
Article numberdev171116
JournalDevelopment (Cambridge)
Volume146
Issue number6
DOIs
StatePublished - Mar 2019

Keywords

  • Kinase
  • MEX-6
  • P granules
  • PAR proteins
  • PAR-3
  • Polarity

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology

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