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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Related Experiment Video

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Detection of Signaling Effector-Complexes Downstream of BMP4 Using in situ PLA, a Proximity Ligation Assay
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Published on: March 3, 2011

Rab27 effectors, pleiotropic regulators in secretory pathways.

Mitsunori Fukuda1

  • 1Laboratory of Membrane Trafficking Mechanisms, Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi 980-8578, Japan. nori@m.tohoku.ac.jp

Traffic (Copenhagen, Denmark)
|May 18, 2013
PubMed
Summary
This summary is machine-generated.

Rab27 small GTPases, including Rab27A and Rab27B, regulate membrane traffic. While initially thought redundant, they interact with distinct effectors, mediating diverse cellular secretion pathways and offering insights into Griscelli syndrome.

Keywords:
Munc13-4Rab27 effectorSlac2membrane trafficsecretory pathwaysmall GTPasesynaptotagmin-like protein (Slp)

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Rab27, a small GTPase, is crucial for membrane trafficking in metazoans.
  • Two isoforms, Rab27A and Rab27B, exist in vertebrates, with Rab27A linked to Griscelli syndrome.
  • Rab27A effectors (Slp, Slac2, Munc13-4) bind active Rab27A, clarifying melanosome transport and secretion.

Purpose of the Study:

  • To review the current understanding of Rab27 effector functions in secretory pathways.
  • To explore the distinct roles of Rab27A and Rab27B in cellular secretion.
  • To elucidate the molecular mechanisms underlying Rab27-mediated membrane traffic.

Main Methods:

  • Literature review of studies on Rab27 small GTPases and their effectors.
  • Analysis of research on Rab27A and Rab27B interactions with synaptotagmin-like proteins (Slp), Slp homologues lacking C2 domains (Slac2), and Munc13-4.
  • Examination of evidence regarding Rab27's role in melanosome transport, regulated secretion, exosome secretion, and mast cell secretion.

Main Results:

  • Rab27A dysfunction causes type 2 Griscelli syndrome, characterized by silvery hair and immunodeficiency.
  • Rab27A and Rab27B were initially believed to have redundant functions due to shared effectors.
  • Emerging evidence shows Rab27A and Rab27B play distinct roles in specific secretion types (e.g., exosome, mast cell) via different effector interactions.

Conclusions:

  • Rab27A and Rab27B, despite sharing effectors, exhibit specialized functions in distinct secretory pathways.
  • Understanding Rab27 effector interactions is key to deciphering molecular mechanisms of membrane traffic and disease pathologies.
  • Further research into Rab27 isoforms and their effectors will illuminate diverse cellular secretion processes.