Vacuolar transporter Mnr2 safeguards organellar integrity in aged cells.

Publisher: Blackwell Scientific Publications Country of Publication: England NLM ID: 8712028 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1365-2958 (Electronic) Linking ISSN: 0950382X NLM ISO Abbreviation: Mol Microbiol Subsets: MEDLINE

Original Publication: Oxford, OX ; Boston, MA : Blackwell Scientific Publications, c1987-

Aging/*metabolism ; Ascomycota/*metabolism ; Cation Transport Proteins/*metabolism ; Magnesium/*metabolism ; Mitochondria/*metabolism ; Vacuoles/*metabolism; Biological Transport ; Fungal Proteins/metabolism ; Homeostasis ; Plant Diseases/microbiology ; Sequence Deletion

Aging is associated with altered mitochondrial function, which is dependent on the magnesium (Mg ⁺² ) ion flux. The molecular mechanism underlying Mg ⁺² homeostasis, especially during aging has not been well understood. We previously demonstrated that the absence of a vacuolar ion transporter Mnr2 accelerates cell death in the older part of the colony in Magnaporthe oryzae presumably due to an altered Mg ⁺² homeostasis. Here, we show the localization of Mnr2 as dynamic puncta at the vacuolar membrane, especially in the older Magnaporthe cells. Such vacuolar Mnr2 puncta are often localized in close proximity with the filamentous mitochondria in the older cells. Further, we show loss of integrity of mitochondria and vacuoles in older mnr2∆ null cells. Remarkably, exogenously added Mg ⁺² restores the mitochondrial structure as well as improves the lifespan of mnr2∆ null cells. Taken together, we propose an ion transporter Mnr2-based Mg ⁺² homeostasis as a means in preserving mitochondrial and vacuolar integrity and function in older M. oryzae cells.
(© 2021 John Wiley & Sons Ltd.)

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Keywords: Mg+2 ion transporter; aging; ion homeostasis; mitochondrial integrity; rice blast

0 (Cation Transport Proteins)
0 (Fungal Proteins)
I38ZP9992A (Magnesium)

Pyricularia oryzae

Date Created: 20210624 Date Completed: 20220131 Latest Revision: 20220131

20221213

10.1111/mmi.14776

34165830