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Topic: Peroxidases

In the News (Wed 30 Dec 09)

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Hugh Jackman

	Haem peroxidases
		Peroxidases are found in bacteria, fungi, plants and animals.
		On the basis of sequence similarity, haem peroxidases can be categorised into two superfamilies: fungal, plant and bacterial peroxidases form one superfamily [3] and animal enzymes form another [4].
		Fungal, plant and bacterial haem peroxidases (yeast cytochrome c peroxidase, ascorbate peroxidase, bacterial catalaseperoxidases, lignin peroxidase, manganese peroxidase, secretory plant peroxidases).
	metallo.scripps.edu /PROMISE/PEROXIDASES.html (271 words)

	Reviews on fungal, plant and bacterial haem peroxidases
		Andersson, L.A. and Dawson, L.A. EXAFS spectroscopy of hemecontaining oxygenases and peroxidases.
		Reddy, C.A. and D'Souza, T.M. Physiology and molecular biology of the lignin peroxidases of Phanerochaete chrysosporium.
		Sampson, J.B., Rosen, H. and Beckman, J.S. Peroxynitritedependent tyrosine nitration catalyzed by superoxide dismutase, myeloperoxidase, and horseradish peroxidase.
	metallo.scripps.edu /promise/FPBPEROXIDASE_REV.html (772 words)

	BAP Laboratory. Opuntia ficus indica
		Peroxidases (EC 1.11.1.7) were used by Khales and Baaziz (2004) as markers for the identification of Opuntia ficus indica moroccan ecoyypes.
		Peroxidases were extracted from fresh cladodes harvested from 9 ecotypes of the cactus species Opuntia ficus indica Mill.
		Acidic peroxidase forms, well separated on basic gels, showed two principal migration zones with great differences in their enzyme activities depending on the fraction types S and I. Acidic ionically wall-bound peroxidases exhibited fast, highly active isoforms with Rf values 0.42 to 0.58.
	baplaboratory.maroc.to /opuntia.html (586 words)

	LABPV Newsletter n°10
		Peroxidases are heme-containing enzymes (E.C.1.11.1.7) ubiquitous in the plant kingdom and belonging to a superfamily which comprises Class I enzymes from mitochondria, chloroplasts and bacteria, Class II from fungi and Class III "classical" plant peroxidases (1).
		Peroxidases are a class of enzymes prevalent in many plant tissues and the expression of distinct isozymes is specific to particular organs, tissues, or cell types.
		When peroxidase is incubated with Ala the inhibition observed at 20° C is fully sur-mounted at 60° C and an additional increase of activity after exposure at 60° C is at hand by the effect of calcium and copper ions.
	www.unige.ch /LABPV/newsletters/newslet10.html (16781 words)

	Food Technol. Biotechnol. 42 (2004) 33-36 (Site not responding. Last check: 2007-11-06)
		The aim of the present study was to establish the distribution of guaiacol peroxidases in carrot root sections as well as to determine the enzymatic activity and the electrophoretic pattern of isoperoxidases in tissue extracts of particular root regions: central cylinder, inner cortex and epidermis, including the peripheral region of the cortex.
		This is a preliminary study for further investigations of stress influence on the expression of peroxidases in carrot root.
		In the central cylinder and inner cortex region peroxidase activity was localised in tracheary elements.
	jagor.srce.hr /ftbrfd/42-33a.html (226 words)

	Dr. Matera's Research - B-W
		I am currently concentrating on peroxidase hemoproteins, which are a class of enzymes that oxidize a range of diverse substrates in the presence of hydrogen peroxide.
		Peroxidases have been implicated in a number of physiological processes; however, their primary role is as an antimicrobial agent.
		Peroxidases contribute to the nonimmune defense system by oxidizing endogenous halogens or thiocyanate in the presence of hydrogen peroxide to generate active species that will attack foreign pathogens.
	www.bw.edu /academics/chm/faculty/kmatera/research (330 words)

	Characterization of Laccases and Peroxidases from Wood-Rotting Fungi (Family Coprinaceae) -- Heinzkill et al. 64 (5): ...
		Reaction of Coprinus macrorhizus peroxidase with hydrazines and sodium azide.
		Aryl-alcohol oxidase and lignin peroxidase from the white-rot fungus Bjerkandera adusta.
		Roles of lignin peroxidase and manganese peroxidase from Phanerochaete chrysosporium in the decolorization of olive mill wastewaters.
	aem.asm.org /cgi/content/full/64/5/1601 (3908 words)

	Fungal peroxidases: molecular aspects and applications (Site not responding. Last check: 2007-11-06)
		Peroxidases are oxidoreductases that utilize hydrogen peroxide to catalyze oxidative reactions.
		A large number of peroxidases have been identified in fungal species and are being characterized at the molecular level.
		We present an overview of the research efforts undertaken in deciphering the structural basis of the catalytic properties of fungal peroxidases and discuss molecular genetics and protein homology aspects of this enzyme class.
	www.elsevier.com /cdweb/views/article.htt?jnl=01681656&iss=2&vol=93&pii=S016816560100394 (128 words)

	The Quantum Mixed-Spin Heme State of Barley Peroxidase: A Paradigm for Class III Peroxidases -- Howes et al. 77 (1): ...
		Peroxidases are heme-containing enzymes that utilize hydrogen peroxide in one-electron oxidation of different organic substrates.
		Characterization of soybean seed coat peroxidase: resonance Raman evidence for a structure-based classification of plant peroxidases.
		Schonbaum, G. New complexes of peroxidases with hydroxamic acids, hydrazides, and amides.
	www.biophysj.org /cgi/pmidlookup?view=full&pmid=10388773 (7176 words)

	A Search for Ligninolytic Peroxidases in the Fungus Pleurotus eryngii Involving alpha -Keto-gamma -Thiomethylbutyric ...
		The phenolic dimer was degraded by peroxidases PL1 and
		peroxidase activity is not important in biological bleaching and delignification of unbleached Kraft pulp by Trametes versicolor.
		Biochemical and molecular characterization of a manganese peroxidase isoenzyme from Pleurotus ostreatus.
	aem.asm.org /cgi/content/full/65/3/916?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=lignin&searchid=1092919676327_1705&stored_search=&FIRSTINDEX=0&search_url=http://journals.asm.org/cgi/search (4219 words)

	Research - Peroxidases (Site not responding. Last check: 2007-11-06)
		The peroxidase family of proteins includes mammalian (e.g., myelo-, lacto- and thyroid peroxidases), fungal (e.g., lignin and cytochrome c peroxidases), and plant (horseradish peroxidase) enzymes.
		A unique feature of the mammalian peroxidases is the presence of covalent links between the heme group and the protein.
		The links common to myeloperoxidase, lactoperoxidase, eosinophil peroxidase, and probably thyroid peroxidase are two ester bonds between aspartic or glutamic acid residues and hydroxyl groups on the 1- and 5-methyl groups of the heme (Figure 1).
	www.sacs.ucsf.edu /home/Ortiz/res-po.htm (380 words)

	Rapid Deposition of Extensin during the Elicitation of Grapevine Callus Cultures Is Specifically Catalyzed by a ...
		A, In vitro assay of extensin cross-linking by grapevine peroxidases.
		The different peroxidases and their quantities (pmole) assayed are indicated to the right of the figure.
		A Biochemical and Molecular Characterization of LEP1, an Extensin Peroxidase from Lupin
	www.plantphysiol.org /cgi/content/full/127/3/1065 (5863 words)

	Properties of Guaiacol Peroxidase Activities Isolated from Corn Root Plasma Membranes -- Mika and Lüthje 132 (3): ...
		Peroxidase activity was measured with the partially purified enzymes after cation exchange chromatography in the presence of 8.26 m
		peroxidase [44 kD], and ribonuclease A [13.7 kD], Amersham
		Amako K, Chen GX, Asada K (1994) Separate assays specific for ascorbate peroxidase and guaiacol peroxidase and for the chloroplastic and cytosolic isozymes of ascorbate peroxidase in plants.
	www.plantphysiol.org /cgi/content/full/132/3/1489 (4978 words)

	Cytochrome c peroxidase
		Cytochrome c peroxidase (CcP) is one member of a huge family of heme peroxidases.
		The reaction with peroxide is quite similar for all of the heme peroxidases, and the heme binding pocket is highly conserved among heme peroxidases.
		The electron donor is characteristic for each peroxidase, and considerable variability is seen in the nature of the donor.
	chem-faculty.ucsd.edu /kraut/projects.html (680 words)

	Peroxidases Wheezing Their Way into Asthma -- Cross et al. 164 (7): 1102 -- American Journal of Respiratory and ...
		Peroxidases Wheezing Their Way into Asthma -- Cross et al.
		in NZW mice is caused by the absence of eosinophil peroxidase,
		Eosinophil peroxidase mediates protein nitration in allergic airway inflammation in mice.
	ajrccm.atsjournals.org /cgi/content/full/164/7/1102 (1553 words)

	Phylogenetic relationships in class I of the superfamily of bacterial, fungal, and plant peroxidases -- Zámocky ... (Site not responding. Last check: 2007-11-06)
		cerevisiae[7] and ascorbate peroxidase (APX) from Pisum sativum[8]
		database) is discernible in all the peroxidases analysed.
		are 100% conserved in all the peroxidases analysed.
	content.febsjournal.org /cgi/content/full/271/16/3297 (5294 words)

	Irreducible complexity - Wikipedia, the free encyclopedia
		This chamber is lined with cells that secrete catalases and peroxidases.
		When the contents of the reservoir are forced into the reaction chamber, the catalases and peroxidases rapidly break down the hydrogen peroxide and catalyze the oxidation of the hydroquinones into p-quinones.
		These reactions release free oxygen and generate enough heat to bring the mixture to the boiling point and vaporize about a fifth of it.
	en.wikipedia.org /wiki/Irreducible_complexity (2752 words)

	Three differentially expressed basic peroxidases from wound-lignifying Asparagus officinalis -- Holm et al. 54 (391): ...
		The activity of ionically bound peroxidases from an asparagus
		peroxidase activity was due to the increase of several distinct
		III plant peroxidases in terms of conserved regions with a calculated
	jxb.oxfordjournals.org /cgi/content/abstract/54/391/2275 (307 words)

	Pfam 18.0 : peroxidase (Site not responding. Last check: 2007-11-06)
		Peroxidases are haem-containing enzymes that use hydrogen peroxide asthe electron acceptor to catalyse a number of oxidative reactions.
		One oxidising equivalent resides on iron, giving the oxyferryl MEDLINE:8062820 intermediate, while in many peroxidases the porphyrin (R) is oxidised to the porphyrin pi-cation radical (R').
		Class III consists of the secretory plant peroxidases, which have multiple tissue-specific functions: e.g., removal of hydrogen peroxide from chloroplasts and cytosol; oxidation of toxic compounds; biosynthesis of the cell wall; defence responses towards wounding; indole-3-acetic acid (IAA) catabolism; ethylene biosynthesis; and so on MEDLINE:.
	pfam.wustl.edu /cgi-bin/getdesc?name=peroxidase (321 words)

	Mechanisms of Degradation by White Rot Fungi (Site not responding. Last check: 2007-11-06)
		The mechanism of oxidation generally applicable to peroxidases is shown in Figure 1.
		It is possible that the hydroxyl radical is involved in the oxidation of chemicals that are not oxidized directly by lignin peroxidases but which are mineralized by the fungus.
		On the mechanism of inhibition of the veratryl alcohol oxidase activity of lignin peroxidase H2 by EDTA.
	ehp.niehs.nih.gov /members/1995/Suppl-5/aust-full.html (1694 words)

	Plant Gene Register PGR96-066 (Site not responding. Last check: 2007-11-06)
		Peroxidases (EC 1.11.1.7) are heme-containing enzymes widely distributed in the plant kingdom.
		They have been divided in three classes, representative of prokaryotic lineage peroxidases, fungal extracellular peroxidases and classical secretory plant peroxidases (Welinder, 1992).
		Around thirty clones were clearly identified as peroxidases by partial sequencing at the 5' end and could be assigned to five different peroxidases.
	www.tarweed.com /pgr/PGR96-066.html (794 words)

	CHARACTERIZATION OF CHILE PEPPER FRUIT PEROXIDASES DURING RIPENING (Site not responding. Last check: 2007-11-06)
		With the increased popularity of Spanish cuisine, pungent pepper production is becoming a more economically important crop in the southwestern U.S. Enzymes involved in the ripening of pepper fruit are important to future breeding programs, because of their potential manipulation in enhancing or decreasing ripening, increasing disease resistance, and enhancing flavor quality.
		Peroxidase is an enzyme that has been implicated in playing a role in disease resistance, and possibly, flavor quality in pungent peppers.
		An acidic peroxidase was characterized according to molecular weight, isoelectric charge, optimum pH, and temperature range.
	www.nal.usda.gov /ttic/tektran/DATA/000007/03/0000070329.html (152 words)

	Wiley::Heme Peroxidases
		This book reflects the tremendous growth peroxidases research has experienced in recent years, providing for the first time in over three decades a systematic, up-to-date treatment of the subject.
		From cancer in plants to unique saddle-shaped hemes in peroxidases, it consolidates vast amounts of information previously scattered in the professional literature, covering all aspects of these ubiquitous enzymes that act on a variety of substances and processes in living systems-their properties, reactions, crystal structures, cloning, and more.
		This one-stop reference for analytical biochemists, biotechnologists, and others interested in the study and use of peroxidases, offers a critical review of the literature, and sorts through the various conflicting reports about peroxidase mechanisms.
	www3.interscience.wiley.com:8100 /WileyCDA/WileyTitle/productCd-0471242446.html (235 words)

	Identification of a Ca2+-Pectate Binding Site on an Apoplastic Peroxidase -- Carpin et al. 13 (3): 511 -- THE PLANT CELL
		corresponded to a 70-fold purification of the peroxidase in
		Espelie, K.E., and Kolattukudy, P.E. (1985) Purification and characterization of an abscisic acid–inducible anionic peroxidase associated with suberization in potato (Solanum tuberosum).
		Penel, C., Van Cutsem, P., and Greppin, H. (1999) Interactions of a plant peroxidase with oligogalacturonides in the presence of calcium ions.
	www.plantcell.org /cgi/content/full/13/3/511 (4540 words)

	A Search for Ligninolytic Peroxidases in the Fungus Pleurotus eryngii Involving alpha -Keto-gamma -Thiomethylbutyric ...
		A Search for Ligninolytic Peroxidases in the Fungus Pleurotus eryngii Involving alpha -Keto-gamma -Thiomethylbutyric Acid and Lignin Model Dimers -- Caramelo et al.
		-oxidizing peroxidase was identified in the SSF cultures on the
		This enzyme is related to the Mn-dependent peroxidase of P.
	aem.asm.org /cgi/content/abstract/65/3/916?maxtoshow=&.../cgi/search (354 words)

	[No title]
		The active site of peroxidases and the residues conserved in the different peroxidases.
		MnP = manganese peroxidase (from the fungus Phanerochaete chrysosporium)
		The substrate of lignin peroxidase (LiP) is a high molecular weight polymer
	www.cerm.unifi.it /CHBIOIN/lez14.htm (83 words)

	Interference of Plant Peroxidases with Guaiac-based Fecal Occult Blood Tests Is Avoidable -- Sinatra et al. 45 (1): 123 ...
		Plant peroxidase was used in the form of crude horseradish peroxidase extract
		Positivity rates of each FOBT for the 61 subjects on the low heme/high plant peroxidase challenge diet 24, 48, and 72 h after smearing.
		Peroxidase levels in food: relevance to colorectal cancer screening.
	www.clinchem.org /cgi/content/full/45/1/123 (2570 words)

	AGING AND EXERCISE (Site not responding. Last check: 2007-11-06)
		The mechanisms underlying the aging process are not well understood.
		Possible hypotheses (2, 8) include a "wear and tear" which exceeds the reparative capacity of the tissues, a development of immunity to the individual's own protein constituents, and errors in cell division, associated with exposure to external radiation or endogenous mitogens such as peroxidases.
		Some biologists have even argued that aging has been "programmed" by evolution to avoid the hazard of overpopulation.
	www.sportsci.org /encyc/agingex/agingex.html (3149 words)

	peroxidases - StormingMedia
		Use of Fungal Peroxidases for Neutralization of Mustard Gas Date: 01 SEP 1994
		Acquisition of Heat Stable Enzymes from Thermophilic Microorganisms: Peroxidases, Ureases, and Glucose Oxidases Date: APR 92
		Synthesis of 1-Methylindole-3-Acetaldehyde and Its Oxidation by Horseradish Peroxidase Date: OCT 87
	www.stormingmedia.us /keywords/peroxidases.html (940 words)

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