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Vacuolar transporter Mnr2 safeguards organellar integrity in aged cells

Md Hashim Reza1,2, Rajesh Patkar2,3, Kaustuv Sanyal1

  • 1Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India.

Molecular Microbiology
|June 24, 2021
PubMed

Insights

Magnesium (Mg+2) ion homeostasis, regulated by the Mnr2 transporter, is crucial for maintaining mitochondrial and vacuolar integrity during aging in Magnaporthe oryzae. Supplementing Mg+2 improves cell lifespan and mitochondrial structure in aging cells.

Area of Science:

  • Cell Biology
  • Mycology
  • Aging Research

Background:

  • Aging is linked to impaired mitochondrial function, influenced by magnesium (Mg+2) ion flux.
  • The molecular basis of Mg+2 homeostasis during aging remains unclear.
  • Previous work showed Mnr2 transporter absence accelerates aging-related cell death in Magnaporthe oryzae.

Purpose of the Study:

  • To investigate the role of the Mnr2 transporter in Mg+2 homeostasis during aging in Magnaporthe oryzae.
  • To elucidate the relationship between Mnr2, Mg+2, and the integrity of mitochondria and vacuoles in aging fungal cells.

Main Methods:

  • Localization studies of the Mnr2 transporter in aging Magnaporthe oryzae cells.
  • Microscopy to assess mitochondrial and vacuolar integrity in wild-type and mnr2∆ null cells.
  • Experimental manipulation of extracellular Mg+2 levels.

Main Results:

  • Mnr2 localizes to dynamic puncta at the vacuolar membrane in older Magnaporthe cells, often near mitochondria.
  • Loss of Mnr2 leads to mitochondrial and vacuolar integrity loss in aging cells.
  • Exogenous Mg+2 supplementation rescues mitochondrial structure and extends lifespan in mnr2∆ null cells.

Conclusions:

  • The Mnr2 transporter plays a key role in maintaining Mg+2 homeostasis in aging Magnaporthe oryzae.
  • Mnr2-dependent Mg+2 homeostasis is essential for preserving mitochondrial and vacuolar integrity and function.
  • Targeting Mg+2 transport may offer strategies to mitigate aging-related cellular decline.
Keywords:
Mg+2 ion transporteragingion homeostasismitochondrial integrityrice blast

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