geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Ascorbate oxidation reduction in Helicoverpa zea as a scavenging system against dietary oxidants


, : Ascorbate oxidation reduction in Helicoverpa zea as a scavenging system against dietary oxidants. Archives of insect biochemistry and physiology9(1): 27-37

We provide evidence of an important role for ascorbate free radical (AFR) reductase, dehydroascorbate (DHA) reductase, glutathione, and glutathione reductase as components of an oxidant-scavenging system in the midgut of larval Helicoverpa zea. Also, midgut ortho-quinone reductase is a potentially important constituent of the protective system against quinones. The midgut activities of AFR reductase, DHA reductase, glutathione reductase, and ortho-quinone reductase were, respectively, 168, 22.1, 6, and 39.5 nmol/min/mg protein. The relatively high activity of these enzymes in the midgut provides circumstantial evidence for a protective mechanism utilizing ascorbate as an antioxidant and glutathione and/or NADPH as reductants. To our knowledge, the enzymes AFR reductase and DHA reductase have not been reported in insects. The particular relevance of this system to antioxidant protection, and in particular to the detoxication of quinones formed in damaged leaf tissues, is discussed.

US$19.90

DOI: 10.1002/arch.940190104


Other references

Bruining K.; Kaplan J.G.; Schaumburg H.H.; Zeifer B.; Weiss K., 1991: Mri in the evaluation of cauda equina syndrome of long standing ankylosing spondylitis. Neurology 41(3 SUPPL 1): 137

Blackburn, T.M.; Gaston, K.J., 1996: Spatial patterns in the geographic range sizes of bird species in the New World. The attempt to identify and explain pattern in the extent of species' geographical distributions at regional scales has been central to macroecology. However, with the exception of abundance, consistent relations between other variables and s...

Nilsson, J.; Homan, E.J.; Smilde, A.K.; Grol, C.J.; Wikström, H., 1998: A multiway 3D QSAR analysis of a series of (S)-N-[(1-ethyl-2-pyrrolidinyl)methyl]-6-methoxybenzamides. Recently, the multilinear PLS algorithm was presented by Bro and later implemented as a regression method in 3D QSAR by Nilsson et al. In the present article a well-known set of (S)-N-[(1-ethyl-2-pyrrolidinyl)methyl]-6-methoxybenzamides, with affi...

Santen, S.A.; Peterson, W.J.; Khandelwal, S.; House, J.B.; Manthey, D.E.; Sozener, C.B., 2014: Medical student milestones in emergency medicine. Medical education is a continuum from medical school through residency to unsupervised clinical practice. There has been a movement toward competency-based medical education prompted by the Accreditation Council for Graduate Medical Education (ACG...

Akhmetzyanov, D.; Plackmeyer, J.; Endeward, B.; Denysenkov, V.; Prisner, T.F., 2015: Pulsed electron-electron double resonance spectroscopy between a high-spin Mn(2+) ion and a nitroxide spin label. Pulsed Electron-Electron Double Resonance (PELDOR) has attracted considerable attention for biomolecular applications, as it affords precise measurements of distances between pairs of spin labels in the range of 1.5-8 nm. Usually nitroxide moietie...

Freedman, B., 1950: Congenital absence of the sacrum and coccyx; report of a case and review of the literature. British Journal of Surgery 37(147): 299-303

Freedland, M.E., 1960: Temporal arteritis. A report of two cases without systemic symptoms. California Medicine 92: 41-43

Balasundaram, D.; Tabor, C.W.; Tabor, H., 1993: Oxygen toxicity in a polyamine-depleted spe2 delta mutant of Saccharomyces cerevisiae. When a mutant of Saccharomyces cerevisiae (spe2 delta) that cannot make spermidine or spermine was incubated in a polyamine-deficient medium in oxygen, there was a rapid cessation of cell growth and associated cell death. In contrast, when the mut...

Allen Roy Hutchins, 1910: The Center Star group of mines, Rossland, B. C. Engineering and Mining Journal Pages 17-19

Kasischke, K.A.; Vishwasrao, H.D.; Fisher, P.J.; Heikal, A.A.; Zipfel, W.R.; Webb, W.W., 2003: Two - photon NADH imaging resolves functions of astrocytes and neurons in metabolic recovery during focal neural activity. There is exceptional disagreement on the nature of glycolytic and oxidative metabolic responses during focal neural activity. These activity-dependent physiological changes ultimately drive the observed metabolic (glucose-uptake in PET) and vascul...