Format

Send to:

Choose Destination
See comment in PubMed Commons below
Ann Bot. 2006 Jun;97(6):1145-9. Epub 2006 Mar 13.

The mitochondrial fission regulator DRP3B does not regulate cell death in plants.

Author information

  • 1Institute of Molecular and Cellular Biosciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Tokyo 113-0032, Japan.

Abstract

BACKGROUND AND AIMS:

Recent reports have described dramatic alterations in mitochondrial morphology during metazoan apoptosis. A dynamin-related protein (DRP) associated with mitochondrial outer membrane fission is known to be involved in the regulation of apoptosis. This study analysed the relationship between mitochondrial fission and regulation of plant cell death.

METHODS:

Transgenic plants were generated possessing Arabidopsis DRP3B (K56A), the dominant-negative form of Arabidopsis DRP, mitochondrial-targeted green fluorescent protein and mouse Bax.

KEY RESULTS:

Arabidopsis plants over-expressing DRP3B (K56A) exhibited long tubular mitochondria. In these plants, mitochondria appeared as a string-of-beads during cell death. This indicates that DRP3B (K56A) prevented mitochondrial fission during plant cell death. However, in contrast to results for mammalian cells and yeast, Bax-induced cell death was not inhibited in DRP3B (K56A)-expressing plant cells. Similarly, hydrogen peroxide-, menadione-, darkness- and salicylic acid-induced cell death was not inhibited by DRP3B (K56A) expression.

CONCLUSIONS:

These results indicate that the systems controlling cell death in animals and plants are not common in terms of mitochondrial fission.

PMID:
16533833
[PubMed - indexed for MEDLINE]
PMCID:
PMC2803389
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk