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Interaction of Golgin-84 with the COG complex mediates the intra-Golgi retrograde transport

Miwa Sohda1, Yoshio Misumi, Akitsugu Yamamoto

  • 1Division of Oral Biochemistry, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata 951-8514, Japan.

Traffic (Copenhagen, Denmark)
|September 30, 2010
PubMed

Insights

Golgin-84, a Golgi tether, is crucial for intra-Golgi retrograde traffic by interacting with the COG complex. This interaction precedes SNARE assembly, ensuring proper vesicle tethering and Golgi function.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Golgi Apparatus Function

Background:

  • Golgin-84 is a Golgi membrane protein that tethers coat protein I (COPI) vesicles.
  • Golgin-84 interacts with the conserved oligomeric Golgi (COG) complex, specifically its Cog7 subunit.
  • Intra-Golgi retrograde traffic is essential for maintaining Golgi homeostasis.

Purpose of the Study:

  • To investigate the role of golgin-84 as a tether for COPI vesicles in intra-Golgi retrograde traffic.
  • To elucidate the functional relationship between golgin-84 and the COG complex in vesicle tethering.

Main Methods:

  • Golgin-84 knockdown (KD) in cells.
  • Analysis of glycoprotein maturation (CD44, lamp1).
  • Golgi morphology and protein localization studies.
  • Vesicle analysis for intra-Golgi SNAREs and GPP130.
  • COG complex subunit (Cog3, Cog7) KD experiments.
  • Investigation of golgin-84 and CASP interactions.

Main Results:

  • Golgin-84 KD disrupted glycoprotein maturation and caused Golgi fragmentation.
  • Depletion of golgin-84 led to accumulation of vesicles with SNAREs and GPP130.
  • Diminishing the COG complex yielded similar results, indicating a strong correlation.
  • COG complex-dependent vesicles in Cog3 or Cog7 KD cells contained golgin-84.
  • Golgin-84's interaction with CASP decreased in Cog3 KD cells.

Conclusions:

  • Golgin-84 functions as a critical tether for COPI vesicles in intra-Golgi retrograde transport.
  • The interaction between golgin-84 and the COG complex is vital for vesicle tethering.
  • Golgin-84 engages with the COG complex prior to SNARE assembly during retrograde traffic.

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