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APX1 L-ascorbate peroxidase

ascorbate peroxidase, APX1, ascorbate peroxidase 1
Encodes a cytosolic ascorbate peroxidase APX1. Ascorbate peroxidases are enzymes that scavenge hydrogen peroxide in plant cells. Eight types of APX have been described for Arabidopsis: three cytosolic (APX1, APX2, APX6), two chloroplastic types (stromal sAPX, thylakoid tAPX), and three microsomal (APX3, APX4, APX5) isoforms. At least part of the induction of heat shock proteins during light stress in Arabidopsis is mediated by H2O2 that is scavenged by APX1. Expression of the gene is downregulated in the presence of paraquat, an inducer of photoxidative stress. (from NCBI)
Top mentioned proteins: catalase, SOD, ACID, Ros, CAN
Papers on ascorbate peroxidase
Alleviation of lead-induced physiological, metabolic, and ultramorphological changes in leaves of upland cotton through glutathione.
New
Zhu et al., Hangzhou, China. In Environ Sci Pollut Res Int, Feb 2016
Activities of antioxidant enzymes (catalase (CAT), superoxide dismutase (SOD), peroxidase (POD), glutathione reductase (GR), and ascorbate peroxidase (APX)) were also increased by GSH application under Pb toxicity.
Synergistic interaction among begomoviruses leads to the suppression of host defense-related gene expression and breakdown of resistance in chilli.
New
Chakraborty et al., New Delhi, India. In Appl Microbiol Biotechnol, Feb 2016
Resistant chilli plants co-inoculated with four genomic components of begomoviruses showed drastic reduction of host basal (ascorbate peroxidase, thionin, polyphenol oxidase) and specific defense-related gene (NBS-LRR) expression.
Polyamine and nitric oxide crosstalk: Antagonistic effects on cadmium toxicity in mung bean plants through upregulating the metal detoxification, antioxidant defense and methylglyoxal detoxification systems.
New
Fujita et al., Japan. In Ecotoxicol Environ Saf, Feb 2016
Put and/or SNP reduced Cd uptake, increasd phytochelatin (PC) content, reduced oxidative damage enhancing non-enzymatic antioxidants (AsA and GSH) and activities of enzymes [superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione S-transferase (GST), and glutathione peroxidase (GPX)].
Diversity and evolution of ascorbate peroxidase functions in chloroplasts: more than just a classical antioxidant enzyme?
New
Ishikawa et al., Matsue, Japan. In Plant Cell Physiol, Feb 2016
In this cycle, the stromal and thylakoid membrane-attached isoforms of ascorbate peroxidase (sAPX and tAPX, respectively) are involved in the metabolism of H2O2.
Phytoremediation of heavy metals by Alternanthera bettzickiana: Growth and physiological response.
New
Abbasi et al., Gujrāt, Pakistan. In Ecotoxicol Environ Saf, Jan 2016
The activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) increased under lower metal levels (0.5 and 1.0mM) while decreased at higher metal levels (2.0mM).
Enhancement of antioxidant enzymes activities, drought stress tolerances and quality of potato plants as response to algal foliar application.
New
El Baroty et al., Cairo, Egypt. In Recent Pat Food Nutr Agric, Jan 2016
METHOD: The yield of tuber, concentration of low antioxidant defense compounds (glutathione, ascorbate, carotenoids, total phenol, flavinoids and tocopherols) and the activity of various antioxidant defense enzymes (catalase CAT; peroxidase POD; ascorbate peroxidase APX and superoxide dismutase SOD) in tuber of treated potato plants with algae extract were significantly increased compared with that in non-treated plants.
Stevioside prevents oxidative stress in wheat seedlings.
New
Mironov et al., Kazan', Russia. In Dokl Biol Sci, Nov 2015
Stevioside has been demonstrated to cause a decrease in the malondialdehyde formation rate, an increase in the activities of antioxidant enzymes (peroxidase and ascorbate peroxidase), and the accumulation of proline and carotenoids.
[Alleviation of salt stress during maize seed germination by presoaking with exogenous sugar].
New
Ma et al., In Ying Yong Sheng Tai Xue Bao, Sep 2015
Exogenous Glc and Suc presoaking could increase the activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), glutathione peroxidase (GPX), glutathione reductase (GR) and induce glucose-6-phosphate dehydrogenase (G6PDH) activity of maize shoot under salt stress.
Nitric oxide is a ubiquitous signal for maintaining redox balance in plant cells: regulation of ascorbate peroxidase as a case study.
Review
New
Lamattina et al., Mar del Plata, Argentina. In J Exp Bot, May 2015
In particular, we describe the redox post-translational modifications of cytosolic ascorbate peroxidase and its influence on enzyme activity.
Resurrection plants of the genus Ramonda: prospective survival strategies - unlock further capacity of adaptation, or embark on the path of evolution?
Review
Stevanović et al., Belgrade, Serbia. In Front Plant Sci, 2014
Dehydration induces activation of antioxidative enzymes (ascorbate peroxidase, glutathione reductase, polyphenol oxidase), increase in amounts of AsA and GSH, phenolic acids, dehydrins, sucrose, and inorganic ions.
Separate and combined responses to water deficit and UV-B radiation.
Review
Chadzinikolau et al., Poznań, Poland. In Plant Sci, 2013
The coordinated increased activity of the enzymatic antioxidant defence system such as up-regulation of superoxide dismutase, catalase, guaiacol peroxidase, ascorbate peroxidase and glutathione reductase is an important mechanism of tolerance to water deficit and UV-B radiation.
Functional roles of flavonoids in photoprotection: new evidence, lessons from the past.
Review
Tattini et al., Sesto Fiorentino, Italy. In Plant Physiol Biochem, 2013
We also draw a picture in which vacuolar flavonoids in conjunction with peroxidases and ascorbic acid constitute a secondary antioxidant system aimed at detoxifying H2O2, which may diffuse out of the chloroplast at considerable rates and enter the vacuole following excess light stress-induced depletion of ascorbate peroxidase.
Antioxidant Defenses in Plants with Attention to Prunus and Citrus spp.
Review
Racchi, Florence, Italy. In Antioxidants (basel), 2012
Biochemical and molecular features of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) are discussed because they play crucial roles in scavenging ROS in the different cell compartments and in response to stress conditions.
Engineered ascorbate peroxidase as a genetically encoded reporter for electron microscopy.
Impact
Ting et al., Cambridge, United States. In Nat Biotechnol, 2012
Electron microscopy (EM) is the standard method for imaging cellular structures with nanometer resolution, but existing genetic tags are inactive in most cellular compartments or require light and can be difficult to use.
Extranuclear protection of chromosomal DNA from oxidative stress.
GeneRIF
Mittler et al., Gent, Belgium. In Proc Natl Acad Sci U S A, 2011
Studies indicate that in apx1/cat2 double-mutant plants, a DNA damage response is activated, suppressing growth via a WEE1 kinase-dependent cell-cycle checkpoint.
Ascorbate peroxidase 1 plays a key role in the response of Arabidopsis thaliana to stress combination.
GeneRIF
Mittler et al., Reno, United States. In J Biol Chem, 2009
cytosolic APX1 plays a key role in the acclimation of plants to a combination of drought and heat stress
Diverse roles for chloroplast stromal and thylakoid-bound ascorbate peroxidases in plant stress responses.
GeneRIF
Rintamäki et al., Turku, Finland. In Biochem J, 2008
Data suggest that ascorbate peroxidase is particularly important for photoprotection during the early greening process in Arabidopsis.
Antioxidant status, peroxidase activity, and PR protein transcript levels in ascorbate-deficient Arabidopsis thaliana vtc mutants.
GeneRIF
Smirnoff et al., Exeter, United Kingdom. In J Exp Bot, 2007
Ascorbate peroxidase activity was higher in ascorbate-deficient mutants.
Double mutants deficient in cytosolic and thylakoid ascorbate peroxidase reveal a complex mode of interaction between reactive oxygen species, plant development, and response to abiotic stresses.
GeneRIF
Mittler et al., Reno, United States. In Plant Physiol, 2007
Lack of a cytosolic hydrogen peroxide removal enzyme triggers a signal which results in stunted growth and enhanced sensitivity to oxidative stress.
Antioxidant responses to drought in sunflower and sorghum seedlings.
Kirkham et al., Manhattan, United States. In New Phytol, 1996
Levels of leaf enzymatic antioxidants (ascorbate peroxidase, catalase, guaiacol peroxidase, dehydroascorbate reductase, monodehydroascorbate reductase, glutathione reductase and superoxide dismutase), nonenzymatic antioxidants (ascorbate, glutathione and carotenoids) and stress parameters (Chl and malondialdehyde [MDA]) were determined.
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