Modulation of mitochondrial activity by S-nitrosoglutathione reductase in Arabidopsis thaliana transgenic cell lines

Lucas Frungillo, Jusceley Fatima Palamim De Oliveira, Elzira Elisabeth Saviani, Halley Caixeta Oliveira, M. Carmen Martínez, Ione Salgado

Research output: Contribution to journalArticleResearchpeer-review

29 Citations (Scopus)

Abstract

The enzyme S-nitrosoglutathione reductase (GSNOR) has an important role in the metabolism of S-nitrosothiols (SNO) and, consequently, in the modulation of nitric oxide (NO)-mediated processes. Although the mitochondrial electron transport chain is an important target of NO, the role of GSNOR in the functionality of plant mitochondria has not been addressed. Here, we measured SNO content and NO emission in Arabidopsis thaliana cell suspension cultures of wild-type (WT) and GSNOR overexpressing (GSNOROE) or antisense (GSNORAS) transgenic lines, grown under optimal conditions and under nutritional stress. Respiratory activity of isolated mitochondria and expression of genes encoding for mitochondrial proteins were also analyzed. Under optimal growth conditions, GSNOROE had the lowest SNO and NO levels and GSNORAS the highest, as expected by the GSNO-consuming activity of GSNOR. Under stress, this pattern was reversed. Analysis of oxygen uptake by isolated mitochondria showed that complex I and external NADH dehydrogenase activities were inhibited in GSNOROE cells grown under nutritional stress. Moreover, GSNOROE could not increase alternative oxidase (AOX) activity under nutritional stress. GSNORAS showed constitutively high activity of external NADH dehydrogenase, and maintained the activity of the uncoupling protein (UCP) under stress. The alterations observed in mitochondrial protein activities were not strictly correlated to changes in gene expression, but instead seemed to be related with the SNO/NO content, suggesting a post-transcriptional regulation. Overall, our results highlight the importance of GSNOR in modulating SNO and NO homeostasis as well mitochondrial functionality, both under normal and adverse conditions in A. thaliana cells. © 2012 Elsevier B.V.
Original languageEnglish
Pages (from-to)239-247
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1827
DOIs
Publication statusPublished - 1 Mar 2013

Keywords

  • Alternative oxidase
  • Arabidopsis thaliana
  • GSNO reductase
  • Nitric oxide
  • Respiratory chain
  • Uncoupling protein

Fingerprint Dive into the research topics of 'Modulation of mitochondrial activity by S-nitrosoglutathione reductase in Arabidopsis thaliana transgenic cell lines'. Together they form a unique fingerprint.

Cite this