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Rim is a putative Rab3 effector in regulating synaptic-vesicle fusion

Author

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  • Yun Wang

    (The University of Texas, Southwestern Medical Center at Dallas)

  • Masaya Okamoto

    (The University of Texas, Southwestern Medical Center at Dallas)

  • Frank Schmitz

    (Max-Planck-Institut für Experimentelle Medizin)

  • Kay Hofmann

    (Swiss Institute for Experimental Cancer Research)

  • Thomas C. Südhof

    (The University of Texas, Southwestern Medical Center at Dallas)

Abstract

Rab3 is a neuronal GTP-binding protein that regulates fusion of synaptic vesicles and is essential for long-term potentiation of hippocampal mossy fibre synapses1,2,3,4,5. More than thirty Rab GTP-binding proteins are known to function in diverse membrane transport pathways, although their mechanisms of action are unclear. We have now identified a putative Rab3-effector protein called Rim. Rim is composed of an amino-terminal zinc-finger motif and carboxy-terminal PDZ and C2 domains. It binds only to GTP (but not to GDP)-complexed Rab3, and interacts with no other Rab protein tested. There is enrichment of Rab3 and Rim in neurons, where they have complementary distributions. Rab3 is found only on synaptic vesicles, whereas Rim is localized to presynaptic active zones in conventional synapses, and to presynaptic ribbons in ribbon synapses. Transfection of PC12 cells with the amino-terminal domains of Rim greatly enhances regulated exocytosis in a Rab3-dependent manner. We propose that Rim serves as a Rab3-dependent regulator of synaptic-vesicle fusion by forming a GTP-dependent complex between synaptic plasma membranes and docked synaptic vesicles.

Suggested Citation

  • Yun Wang & Masaya Okamoto & Frank Schmitz & Kay Hofmann & Thomas C. Südhof, 1997. "Rim is a putative Rab3 effector in regulating synaptic-vesicle fusion," Nature, Nature, vol. 388(6642), pages 593-598, August.
    • Handle: RePEc:nat:nature:v:388:y:1997:i:6642:d:10.1038_41580
    DOI: 10.1038/41580
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    Cited by:

    1. Amrita Rai & Anurag K. Singh & Nathalie Bleimling & Guido Posern & Ingrid R. Vetter & Roger S. Goody, 2022. "Rep15 interacts with several Rab GTPases and has a distinct fold for a Rab effector," Nature Communications, Nature, vol. 13(1), pages 1-17, December.

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