Search results for: John G. Scandalios

Items from 1 to 12 out of 12 results

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Altered Cu Metabolism and Differential Transcription of Cu/Zn Sod Genes in a Cu/ZnSOD-Deficient Mutant of Maize: Evidence for a Cu-Responsive Transcription Factor ^†

Stephanie M. Ruzsa, John G. Scandalios

Biochemistry > 2003 > 42 > 6 > 1508 - 1516

article

The rise of ROS

John G. Scandalios

Trends in Biochemical Sciences > 2002 > 27 > 9 > 483-486

article

Molecular Evolution and Structure-Function Relationships of the Superoxide Dismutase Gene Families in Angiosperms and Their Relationship to Other Eukaryotic and Prokaryotic Superoxide Dismutases

Ryan C. Fink, John G. Scandalios

Archives of Biochemistry and Biophysics > 2002 > 399 > 1 > 19-36

This study assesses whether the phylogenetic relationships between SODs from different organisms could assist in elucidating the functional relationships among these enzymes from evolutionarily distinct species. Phylogenetic trees and intron positions were compared to determine the relationships among these enzymes. Alignment of Cu/ZnSOD amino acid sequences indicates high homology among plant sequences,...

article

Structural Organization, Regulation, and Expression of the Chloroplastic Superoxide Dismutase Sod1 Gene in Maize

Sheri P. Kernodle, John G. Scandalios

Archives of Biochemistry and Biophysics > 2001 > 391 > 1 > 137-147

A cDNA and genomic clone encoding maize chloroplastic Cu/Zn superoxide dismutase Sod1 were isolated. Southern blot analysis indicated little homology between the chloroplastic (Sod1) and the cytosolic (Sod2, Sod4, Sod4A) cDNAs. Sequence analysis of the genomic clone revealed a promoter, transit peptide, and partial coding sequence. The promoter contained several response elements (e.g., for light,...

article

Catalase gene expression in response to chronic high temperature stress in maize

John G. Scandalios, Alberto Acevedo, Stephanie Ruzsa

Plant Science > 2000 > 156 > 1 > 103 - 110

Catalase gene expression was characterized in the scutellum of maize seedlings grown at normal (25 ^o C) and elevated temperatures (35 and 40 ^o C). Chronic elevated temperatures reduce scutellar catalase activity most noticeably in the inbred lines W64A and R6-67, which express all three CAT isozymes (CAT-1, CAT-2, and CAT-3). The observed decline in catalase activity is primarily attributed...

article

Hydrogen peroxide-mediated catalase gene expression in response to wounding

Lingqiang M. Guan, John G. Scandalios

Free Radical Biology and Medicine > 2000 > 28 > 8 > 1182-1190

The effect of wounding on catalase expression was examined in embryos and leaves of maize. All three Cat genes are upregulated in response to wounding in immature embryos. Cat expression also increased in response to jasmonic acid (JA), raising the possibility that JA and wounding may share a common signal transduction pathway in upregulating Cat mRNA in immature embryos. In young leaves, only Cat1...

article

Modulation of antioxidant responses by arsenic in maize - Activation by oxidative stress and identification of the DNA consensus sequence required for functional activity

Photini V. Mylona, Alexios N. Polidoros, John G. Scandalios

Free Radical Biology and Medicine > 1998 > 25 > 4-5 > 576-585

The effects of arsenic on the expression of the antioxidant genes encoding superoxide dismutase, catalase, and glutathione S-transferase, as well as the activity of SOD and CAT enzymes, were examined at different developmental stages and in different tissues. Both CAT and SOD activities increased in response to low concentrations (0.01-0.1 mM) of arsenic in developing maize embryos. In germinating...

article

Non-optimal growth temperatures and antioxidants in the leaves of Sorghum bicolor (L.) Moench. II. Short-term acclimation

Maurizio Badiani, Anna Rita Paolacci, Angelo Fusari, Renato D’Ovidio, more

Journal of Plant Physiology > 1997 > 151 > 4 > 409-421

In pursuing previous studies on long-term acclimation to non-optimal, non-stressing growth temperatures (Badiani et al., 1993 b; Paolacci et al., 1997; Fusari et al., in press), the foliar antioxidant status and the photosynthetic capacity were evaluated in two sorghum [Sorghum bicolor (L.) Moench.] cultivars of different agroclimatic provenance, namely Aralba and ICSV 112, which were grown at the...

article

Introduction

John G Scandalios

Free Radical Biology and Medicine > 1997 > 23 > 3 > 471-472

article

Influence of UV-Light on the Expression of the Cat2 and Cat3 Catalase Genes in Maize

Ralf Boldt, John G. Scandalios

Free Radical Biology and Medicine > 1997 > 23 > 3 > 505-514

The effects of UV (ultraviolet)-irradiation on the expression of the antioxidant genes Cat2 and Cat3, encoding the CAT-2 and CAT-3 catalases in maize were examined. Cat2 and Cat3 transcript accumulation was analyzed in leaves of maize seedlings grown under different light conditions, and subsequently exposed to UV-light. Under DD-(constant darkness) and LL- (continuous light) conditions, as well as...

article

Response of the Maize Catalases to Light

Alexis N. Polidoros, John G. Scandalios

Free Radical Biology and Medicine > 1997 > 23 > 3 > 497-504

The three maize catalase genes respond differentially to light signals. Expression of Cat1 is light independent while expression of Cat2 and Cat3 is light responsive. Upon exposure to light there is rapid accumulation of CAT-2 protein in leaves, due to both increased transcript accumulation and increased translation of the Cat2 message. Short UV light pulses also cause a strong transient induction...

article

The maize mitochondrial MnSODS encoded by multiple genes are localized in the mitochondrial matrix of transformed yeast cells

Dahai Zhu, John G. Scandalios

Free Radical Biology and Medicine > 1995 > 18 > 2 > 179-183

We recently demonstrated that maize mitochondrial MnSODs are encoded by a differentially expressed multigene family. Molecular characterization of the cloned maize MnSod cDNAs shows that all the maize MnSODs encoded by the cloned MnSod have mitochondrial transit peptides and that the matrix-targeting signal was conserved in all the MnSOD precursor proteins, suggesting that all the maize MnSODs are...

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