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CCSer2 gates dynein activity at the cell periphery.

Juliana L Zang1, Daytan Gibson1, Ann-Marie Zheng1

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CCSer2 is the first identified protein to control cytoplasmic dynein-1 (dynein) motor activity spatially. This discovery explains how dynein traffics cellular cargos to specific locations, crucial for cell migration.

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Cell Migration

Background:

  • Cytoplasmic dynein-1 (dynein) is a critical microtubule motor protein responsible for intracellular transport of diverse cargos.
  • The precise spatial and temporal regulation of dynein activity remains largely unknown, hindering our understanding of its cellular functions.
  • Dynein's ability to discriminate cargos and traffic them to specific cellular regions is essential for cellular processes.

Purpose of the Study:

  • To identify proteins that regulate the spatial activity of cytoplasmic dynein-1.
  • To elucidate the mechanism by which dynein's trafficking is controlled in specific cellular locations.
  • To understand the role of spatial dynein regulation in cell migration.

Main Methods:

  • Identification of CCSer2 as a novel protein interacting with dynein.
  • Investigating the effect of CCSer2 on dynein localization and activity at the cell periphery.
  • Analyzing the interaction between CCSer2, dynein, and its regulator Ndel1 using cellular models.

Main Results:

  • CCSer2 was identified as the first protein to gate dynein activity spatially.
  • CCSer2 facilitates cell migration in zebrafish, macrophages, and human cells by regulating peripherally localized dynein.
  • CCSer2 disfavors the dynein-Ndel1 interaction at the cell edge, leading to localized dynein activation.

Conclusions:

  • CCSer2 enables spatial specificity of dynein by regulating Ndel1 release at the cell edge.
  • This mechanism provides spatial control over dynein-mediated cargo transport, essential for cell migration.
  • CCSer2 represents a class of proteins that spatially activate dynein in specific microenvironments.