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Defining the mitochondrial stress response in Arabidopsis thaliana

Van Aken, Olivier LU ; Zhang, Botao; Carrie, Chris; Uggalla, Vindya; Paynter, Ellen; Giraud, Estelle and Whelan, James (2009) In Molecular Plant 2(6). p.24-1310
Abstract

To obtain a global overview of how mitochondria respond to stress, we aimed to define the plant mitochondrial stress response (MSR). By combining a set of 1196 Arabidopsis thaliana genes that putatively encode mitochondrial proteins with 16 microarray experiments on stress-related conditions, 45 nuclear encoded genes were defined as widely stress-responsive. Using green fluorescent protein (GFP) fusion assays, the mitochondrial targeting of a large number of these proteins was tested, confirming in total 26 proteins as mitochondrially targeted. Several of these proteins were observed to be dual targeted to mitochondria and plastids, including the small heat shock proteins sHSP23.5 and sHSP23.6. In addition to the well defined stress... (More)

To obtain a global overview of how mitochondria respond to stress, we aimed to define the plant mitochondrial stress response (MSR). By combining a set of 1196 Arabidopsis thaliana genes that putatively encode mitochondrial proteins with 16 microarray experiments on stress-related conditions, 45 nuclear encoded genes were defined as widely stress-responsive. Using green fluorescent protein (GFP) fusion assays, the mitochondrial targeting of a large number of these proteins was tested, confirming in total 26 proteins as mitochondrially targeted. Several of these proteins were observed to be dual targeted to mitochondria and plastids, including the small heat shock proteins sHSP23.5 and sHSP23.6. In addition to the well defined stress components of mitochondria, such as alternative oxidases, nicotinamide adenine dinucleotide (NAD(P)H) dehydrogenases, and heat shock proteins, a variety of other proteins, many with unknown function, were identified. The mitochondrial carrier protein family was over-represented in the stress-responsive genes, suggesting that stress induces altered needs for metabolite transport across the mitochondrial inner membrane. Although the genes encoding many of these proteins contain common cis-acting regulatory elements, it was apparent that a number of distinct regulatory processes or signals likely triggered the MSR. Therefore, these genes provide new model systems to study mitochondrial retrograde regulation, in addition to the widely used alternative oxidase model. Additionally, as changes in proteins responsive to stress did not correlate well with changes at a transcript level, it suggests that post-transcriptional mechanisms also play an important role in defining the MSR.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arabidopsis, Arabidopsis Proteins, Green Fluorescent Proteins, Homeostasis, Mitochondria, Oligonucleotide Array Sequence Analysis, Oxidation-Reduction
in
Molecular Plant
volume
2
issue
6
pages
15 pages
publisher
Oxford University Press
external identifiers
  • scopus:71249116157
ISSN
1674-2052
DOI
10.1093/mp/ssp053
language
English
LU publication?
no
id
a4ec89c9-a61c-43f9-805f-28b8e68e2d06
date added to LUP
2017-05-09 10:08:47
date last changed
2017-10-29 05:01:13
@article{a4ec89c9-a61c-43f9-805f-28b8e68e2d06,
  abstract     = {<p>To obtain a global overview of how mitochondria respond to stress, we aimed to define the plant mitochondrial stress response (MSR). By combining a set of 1196 Arabidopsis thaliana genes that putatively encode mitochondrial proteins with 16 microarray experiments on stress-related conditions, 45 nuclear encoded genes were defined as widely stress-responsive. Using green fluorescent protein (GFP) fusion assays, the mitochondrial targeting of a large number of these proteins was tested, confirming in total 26 proteins as mitochondrially targeted. Several of these proteins were observed to be dual targeted to mitochondria and plastids, including the small heat shock proteins sHSP23.5 and sHSP23.6. In addition to the well defined stress components of mitochondria, such as alternative oxidases, nicotinamide adenine dinucleotide (NAD(P)H) dehydrogenases, and heat shock proteins, a variety of other proteins, many with unknown function, were identified. The mitochondrial carrier protein family was over-represented in the stress-responsive genes, suggesting that stress induces altered needs for metabolite transport across the mitochondrial inner membrane. Although the genes encoding many of these proteins contain common cis-acting regulatory elements, it was apparent that a number of distinct regulatory processes or signals likely triggered the MSR. Therefore, these genes provide new model systems to study mitochondrial retrograde regulation, in addition to the widely used alternative oxidase model. Additionally, as changes in proteins responsive to stress did not correlate well with changes at a transcript level, it suggests that post-transcriptional mechanisms also play an important role in defining the MSR.</p>},
  author       = {Van Aken, Olivier and Zhang, Botao and Carrie, Chris and Uggalla, Vindya and Paynter, Ellen and Giraud, Estelle and Whelan, James},
  issn         = {1674-2052},
  keyword      = {Arabidopsis,Arabidopsis Proteins,Green Fluorescent Proteins,Homeostasis,Mitochondria,Oligonucleotide Array Sequence Analysis,Oxidation-Reduction},
  language     = {eng},
  number       = {6},
  pages        = {24--1310},
  publisher    = {Oxford University Press},
  series       = {Molecular Plant},
  title        = {Defining the mitochondrial stress response in Arabidopsis thaliana},
  url          = {http://dx.doi.org/10.1093/mp/ssp053},
  volume       = {2},
  year         = {2009},
}