Shortstop recruits EB1/APC1 and promotes microtubule assembly at the muscle-tendon junction

Arul Subramanian, Andreas Prokop, Misato Yamamoto, Kaoru Sugimura, Tadashi Uemura, Joerg Betschinger, Juergen A. Knoblich, Talila Volk

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Background: Shot (previously named Kakapo), is a Drosophila Plakin family member containing both Actin binding and microtubule binding domains. In Drosophila, it is required for a wide range of processes, including axon extension, dendrite formation, axonal terminal arborization at the neuromuscular junction, tendon cell development, and adhesion of wing epithelium. Results: To address how Shot exerts its activity at the molecular level, we investigated the molecular interactions of Shot with candidate proteins in mature larval tendon cells. We show that Shot colocalizes with EB1/APC1 and with a compact microtubule array extending between the muscle-tendon junction and the cuticle. Shot forms a protein complex with EB1 via its C-terminal EF-hands and GAS2-containing domains. In tendon cells with reduced Shot activity, EB1/APC1 dissociate from the muscle-tendon junction, and the microtubule array elongates. The resulting tendon cell, although associated with the muscle and the cuticle ends, loses its stress resistance and elongates. Conclusions: Our results suggest that Shot mediates tendon stress resistance by the organization of a compact microtubule network at the muscle-tendon junction. This is achieved by Shot association with the cytoplasmic faces of the basal hemiadherens junction and with the EB1/APC1 complex.
    Original languageEnglish
    Pages (from-to)1086-1095
    Number of pages9
    JournalCurrent Biology
    Volume13
    Issue number13
    DOIs
    Publication statusPublished - 1 Jul 2003

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