cis-Golgi proteins accumulate near the ER exit sites and act as the scaffold for Golgi regeneration after brefeldin A treatment in tobacco BY-2 cells

Mol Biol Cell. 2012 Aug;23(16):3203-14. doi: 10.1091/mbc.E12-01-0034. Epub 2012 Jun 27.

Abstract

The Golgi apparatus forms stacks of cisternae in many eukaryotic cells. However, little is known about how such a stacked structure is formed and maintained. To address this question, plant cells provide a system suitable for live-imaging approaches because individual Golgi stacks are well separated in the cytoplasm. We established tobacco BY-2 cell lines expressing multiple Golgi markers tagged by different fluorescent proteins and observed their responses to brefeldin A (BFA) treatment and BFA removal. BFA treatment disrupted cis, medial, and trans cisternae but caused distinct relocalization patterns depending on the proteins examined. Medial- and trans-Golgi proteins, as well as one cis-Golgi protein, were absorbed into the endoplasmic reticulum (ER), but two other cis-Golgi proteins formed small punctate structures. After BFA removal, these puncta coalesced first, and then the Golgi stacks regenerated from them in the cis-to-trans order. We suggest that these structures have a property similar to the ER-Golgi intermediate compartment and function as the scaffold of Golgi regeneration.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actin Cytoskeleton / metabolism
  • Bacterial Proteins / metabolism
  • Brefeldin A / pharmacology*
  • Cells, Cultured
  • Endoplasmic Reticulum / drug effects
  • Endoplasmic Reticulum / metabolism*
  • Endoplasmic Reticulum / ultrastructure
  • Golgi Apparatus / drug effects
  • Golgi Apparatus / metabolism*
  • Golgi Apparatus / ultrastructure
  • Green Fluorescent Proteins / metabolism
  • Luminescent Proteins / metabolism
  • Membrane Proteins / metabolism
  • Microscopy, Fluorescence
  • Nicotiana / cytology*
  • Plant Proteins / metabolism
  • Protein Synthesis Inhibitors / pharmacology*
  • Protein Transport
  • Recombinant Fusion Proteins / metabolism
  • Time-Lapse Imaging

Substances

  • Bacterial Proteins
  • Luminescent Proteins
  • Membrane Proteins
  • Plant Proteins
  • Protein Synthesis Inhibitors
  • Recombinant Fusion Proteins
  • yellow fluorescent protein, Bacteria
  • Green Fluorescent Proteins
  • Brefeldin A