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Expression and localization of exocytic and recycling Rabs from Magnaporthe oryzae in mammalian cells

Yaoyao Qi1, M Caleb Marlin2, Zhimin Liang2

  • 1Key Laboratory of Biopesticide and Chemical Biology, Fujian Agriculture and Forestry University, Fuzhou, China; Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.

Methods in Cell Biology
|September 12, 2015
PubMed

Insights

Researchers characterized exocytic and recycling Rab GTPases in Magnaporthe oryzae (M. oryzae), a fungus causing rice blast. Three M. oryzae Rabs (MoRabs) were found to be orthologs of mammalian Rabs, functioning in exocytosis and recycling pathways.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Mycology

Background:

  • Rab GTPases are crucial regulators of intracellular membrane trafficking.
  • Magnaporthe oryzae (M. oryzae) causes rice blast disease, impacting agriculture.
  • Understanding M. oryzae's cellular processes is key to disease management.

Purpose of the Study:

  • To characterize exocytic and recycling Rab GTPases in M. oryzae.
  • To investigate the function of MoRab1, MoRab8, and MoRab11.
  • To determine if these MoRabs are orthologs of mammalian Rab proteins.

Main Methods:

  • Bioinformatic identification of putative Rab GTPases from the M. oryzae genome.
  • Cloning and expression of M. oryzae Rab genes (MoRabs) as GFP fusion proteins in mammalian cells.
  • Confocal fluorescence microscopy and immunoblot analysis to assess intracellular localization and colocalization with human Rab counterparts (hRabs).

Main Results:

  • Eleven putative Rab GTPases (MoRabs) were identified in M. oryzae.
  • MoRab1, MoRab8, and MoRab11 were successfully expressed as GFP fusion proteins in mammalian cells.
  • These MoRabs colocalized with their human orthologs (hRabs) on exocytic and recycling organelles, supporting their conserved function.

Conclusions:

  • MoRab1, MoRab8, and MoRab11 are likely functional orthologs of mammalian Rab1, Rab8, and Rab11, respectively.
  • These MoRabs play roles in exocytosis and endosomal recycling in M. oryzae.
  • The conserved function of these MoRabs suggests their importance in M. oryzae development and pathogenicity.
Keywords:
Magnaporthe oryzaeRab1Rab11Rab8Recycling Rab

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