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	Sulfhydryl group - Wikipedia, the free encyclopedia
		The chemistry of the sulfhydryl group is thus related to the chemistry of alcohols; thiols form thioethers, thioacetals and thioesters, in which the alcohol-derived oxygen atom is replaced by a sulfur atom in the oxygen-analogous compounds ethers, acetals, and esters.
		When the sulfhydryl groups of two cysteine residues (as in monomers or constituent units) are brought near each other in the course of protein folding, an oxidation reaction can create a cystine unit with a disulfide bond (-S-S-).
		Sulfhydryl groups in the active site of an enzyme can form noncovalent bonds with the enzyme's substrate as well, contributing to catalytic activity.
	en.wikipedia.org /wiki/Sulfhydryl_group (368 words)

	The Megahealth Society
		Sulfhydryl compounds can donate hydrogen atoms to other chemical reactions fairly easily because the large outer electron shell “delocalizes” the odd remaining electron and minimizes its energy state.
		These sulfhydryl radicals tend to be relatively stable in comparison to other free radicals, and preferentially dimerize into disulfides which are of low toxicity.
		While reduced sulfhydryl bonds play a vital role in antioxidant defense, oxidized disulfide bonds are critical determinants of the three-dimensional structures of proteins and enzymes throughout the body.
	www.ceri.com /ffredox.htm (2124 words)

	Sulfhydryl group -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-07)
		It is the sulfur analog of the (The monovalent group -OH in such compounds as bases and some acids and alcohols) hydroxyl group -OH found in (A liquor or brew containing alcohol as the active agent) alcohols.
		The sulfur atom in the sulfhydryl group is quite (Click link for more info and facts about nucleophilic) nucleophilic, rather more so than the oxygen of an alcohol.
		As the functional group of the (Organic compounds containing an amino group and a carboxylic acid group) amino acid (An amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine) cysteine, the sulfhydryl group plays an important role in biological systems.
	www.absoluteastronomy.com /encyclopedia/s/su/sulfhydryl_group.htm (322 words)

	Sulfhydryl - TheBestLinks.com - Thiol, Sulfhydryl group, Coenzyme A, Lipoamide, ... (Site not responding. Last check: 2007-09-07)
		Sulfhydryl, also called thiol, is contained in a reduced state within coenzyme A, lipoamide, glutathione, cysteine, and mercaptans.
		When a sulfhydryl group is a substituent in an alkane, there are several ways of naming the compound:
		Compounds containing sulfhydryl as their primary group directly attached to carbon.
	www.thebestlinks.com /Thiol.html (167 words)

	Enhancement of Lactase Activity in Milk by Reactive Sulfhydryl Groups Induced by Heat Treatment -- ...
		Sulfhydryl and disulfide groups in skim milk as affected by direct ultra-high-temperature heating and subsequent storage.
		Sulfhydryl group/disulfide bond interchange reactions during heat induced gelation of whey protein isolate.
		Antioxidant activity of skim milk: Effect of heat and resultant sulfhydryl groups.
	jds.fass.org /cgi/content/full/85/10/2497 (2931 words)

	CERI: Living with Alcohol
		Sulfhydryl groups interact with aldehydes to render tham incapable of forming cross links.
		Although this is a powerful aldehyde detoxification mechanism, it is easily overwhelmed by the relatively large amounts of alcohol that are typically consumed with alcoholic beverages as compared to the amounts of alcohol and acetaldehyde that are produced through normal metabolism.
		Much larger doses of glutathione must be taken to get the same sulfhydryl concentration, and a significant but unknown amount of glutathione is broken down in the stomach into its component amino acids (glutamate, cysteine and glycine).
	www.ceri.com /alcohol.htm (2249 words)

	Published Studies (Site not responding. Last check: 2007-09-07)
		Reversible blockade of the calcium-activated nonselective cation channel in brown fat cells by the sulfhydryl reagents mercury and thimerosal.
		Effect of the sulfhydryl reagent thimerosal on cytosolic free Ca and membrane potential of thymocytes.
		The sulfhydryl reagent thimerosal elicits human platelet aggregation by mobilization of intracellular calcium and secondary prostaglandin endoperoxide formation.
	www.altcorp.com /DentalInformation/thimstudys.htm (2481 words)

	Heterobi
		Sulfhydryl and hydroxyl reactive, heterobifunctional protein crosslinking reagent.
		Sulfhydryl selectivity at neutral or slightly alkaline pH is comparable to iodoacetamide, and perhaps greater than maleimide.
		Thioacetyl group is deprotected with 0.02 M hydroxylamine hydrochloride to release free sulfhydryl.
	www.molbio.com /Heterobi.htm (622 words)

	Colin Thorpe
		Sulfhydryl Oxidase from Egg White: A Facile Catalyst for Disulfide Bond Formation in Proteins and Peptides.
		Sulfhydryl oxidases: emerging catalysts of protein disulfide bond formation in eukaryotes.
		Avian Sulfhydryl Oxidase is not a Metalloenzyme: Adventitious Binding of Divalent Metal Ions to the Enzyme.
	www.udel.edu /chem/thorpe/publications.html (229 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-09-07)
		The composition comprises a sulfhydryl donor and a plasminogen activator.
		The sulfhydryl donor is contacted with the plasmin, alone or in the presence of the plasminogen and plasminogen activator, in amounts and under conditions effective to cause the conversion of the plasmin to angiostatin.
		The sulfhydryl donor may be one found endogenously in the animal or an effective amounts of sulfhydryl donor can also be administered to the animal.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/58921.010816&ELEMENT_SET=DECL (9538 words)

	Patent 6,020,457
		Dendritic polymers containing disulfide functional groups which are essentially inert under non-reducing conditions, but which form sulfhydryl groups upon being subjected to a reducing agent are prepared by synthesizing dendritic polymers having a core with a disulfide linkage or by reacting a dendritic polymer with a molecule containing a disulfide linkage and reactive terminal groups.
		The single disulfide group at the core can be reduced to form two sulfhydryl groups and split the dendritic polymer molecule into two parts, each having a single reactive sulfhydryl group to which other molecules, such as proteins, oligonucleotides, peptides, hormones, other dendritic polymers, non-dendritic (e.g., linear or branched) polymers, etc., can be bound.
		The sulfhydryl terminated dendritic polymers may be prepared by terminating a dendritic polymer with a compound containing a disulfide functional group and subsequently reducing the disulfide group or by reacting with a reagent that produces a free thio group (such as Traut's reagent).
	www.pharmcast.com /Patents/020100OG/6020457_Dendritic020100.htm (923 words)

	The Reaction of the Soybean Cotyledon Mitochondrial Cyanide-resistant Oxidase with Sulfhydryl Reagents Suggests That ...
		The sulfhydryl reagent-reacted alternative oxidase could be cross-linked by the homobifunctional lysine-specific cross-linker, ethylene glycolbis(succinimidyl succinate) (data not shown), evidence that the enzyme had maintained its dimeric structure.
		The sulfhydryl positioned closest to the membrane may be the site of pyruvate activation, while the more NH -terminal sulfhydryl may be the redox-regulated group (see text).
		A comparison of the relative effects of the sulfhydryl reagents and pyruvate on the ability of each of these enzymes to be stimulated by pyruvate or to form an oxidized dimer might further suggest which cysteine is associated with pyruvate stimulation and which with covalent cross-linking.
	www.jbc.org /cgi/content/full/271/40/25019 (6494 words)

	Technical Information
		Optimum derivatization of sulfhydryl groups with maleimides is usually achieved within 2.0-2.5 h, pH 7.0-8.0.
		Sulfhydryl modification with vinylsulfones has the advantage that the vinylsulfone itself is stable in aqueous solution for days at pH 9.0
		Sulfhydryl addition to vinylsulfone, unlike maleimides, does not generate stereoisomers which in some instances may complicate analysis and/or bioactivity of the conjugate.
	www.molbio.com /techinfo.htm (612 words)

	ARS \| Publication request: Inhibition of Loquat Enzymatic Browning by Sulfhydryl Compounds
		In the present study, the effectiveness of a series of sulfhydryl compounds in inhibiting polyphenol oxidase activity was investigated.
		Technical Abstract: The effectiveness of a series of sulfhydryl compounds in inhibiting polyphenoloxidase (PPO) activity in a model system (chlorogenic acid solution) and in loquat juices was evaluated.
		Application of different concentrations of sulfhydryl compounds to chlorogenic acid solution and fresh loquat juice showed that L-cysteine appeared to be an effective browning inhibitor.
	ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=124529 (285 words)

	EJPAU 2002. WOŁOSIAK R., KLEPACKA M. ANTIOXIDATIVE PROPERTIES OF ALBUMINS IN ENZYMATICALLY CATALYZED MODEL SYSTEMS
		Absorbances gained in the sulfhydryl groups assay were converted to micromoles SH per gram of protein using calibration curve prepared with glutathione (Sigma).
		No unequivocal correlation between sulfhydryl groups content or aromatic hydrophobicity and the antioxidant properties of preparations was found in both cases.
		No correlation between sulfhydryl groups content or aromatic hydrophobicity and the activities of the preparations was proved.
	www.ejpau.media.pl /series/volume5/issue1/food/art-05.html (1545 words)

	Invasives Plant Pests Literature Collection: Brazilian eloda (Site not responding. Last check: 2007-09-07)
		These results suggest a model in which the interaction of sulfhydryl blockers with sulfhydryl groups of cell components would primarily induce an increase in the Ca2+ cytosolic concentration, followed by membrane depolarization and activation of a plasma membrane NADPH oxidase.
		Only adult leaves were able to respond to the sulfhydryl blockers with an oxidative burst, whereas this response was absent in immature growing leaves and in stem and root segments.
		The ecological implication of genetic uniformity was briefly discussed in relation to the cause of decline in the population after the peak of abundance.
	sain.nbii.gov /invasives/common8.shtml (3787 words)

	ERV1 - ERV1 protein, mitochondrial precursor
		Yeast Erv1p is a ubiquitous FAD-dependent sulfhydryl oxidase, located in the intermembrane space of mitochondria.
		The N-terminal cysteine pair of yeast sulfhydryl oxidase Erv1p is essential for in vivo activity and interacts with the primary redox centre.
		Thus Erv1p represents the first FAD-linked sulfhydryl oxidase from yeast and the first of these enzymes that is involved in mitochondrial biogenesis.
	www.ihop-net.org /UniPub/iHOP/gi/33228.html (223 words)

	Chemistry of Buttermilk Solid Antioxidant Activity -- Wong and Kitts 86 (5): 1541 -- Journal of Dairy Science
		Sulfhydryl content of BMS and whey was measured using the method
		BMS and whey (0.1 to 10 mg) was dissolved
		Antioxidant activity of cysteine and protein sulfhydryls in a linoleate emulsion oxidized by hemoglobin.
	jds.fass.org /cgi/content/full/86/5/1541 (3343 words)

	APStracts 2:0075H, 1995. (Site not responding. Last check: 2007-09-07)
		An intracellular oxidant stress was also imposed by using diethylmaleate to deplete the intracellular non-protein sulfhydryl content (represented by reduced glutathione (GSH)).
		In myocytes isolated from diethylmaleate-treated guinea-pigs (860 mg/kg, intraperitoneally, 30 min before study), intracellular GSH was depleted by 93 %, and ip was depressed by 38 % at all membrane potentials tested.
		Protein sulfhydryl oxidation and glutathione depletion may account, in part, for a depression in Na+/K+ pump activity during reperfusion-induced oxidant stress.
	www.uth.tmc.edu /apstracts/1995/heart/March/75h.html (276 words)

	PE conjugation of Annexin V
		This sulfhydryl is reacted with the SMCC-derivatized PE through reductive cross-linking.
		Note: for conjugations which fail or are poor, it may help to increase or decrease the amount of SMCC with respect to PE, or to use an alternative heterobifunctional crosslinking reagent.
		The PE is covalently coupled to 2-IT-Annexin V through reaction of the maleimide groups with the free sulfhydryl on the of the 2-IT.
	www.drmr.com /abcon/AxVPE.html (1414 words)

	Sulfhydryl Oxidation Overrides Mg2+ Inhibition of Calcium-Induced Calcium Release in Skeletal Muscle Triads -- Donoso ...
		Activation of the cardiac ryanodine receptor by sulfhydryl oxidation is modified by Mg and ATP.
		Sulfhydryl oxidation modifies the calcium dependence of ryanodine-sensitive calcium channels of excitable cells.
		Sulfhydryl oxidation induces rapid calcium release from sarcoplasmic reticulum vesicles.
	www.biophysj.org /cgi/content/full/79/1/279 (4519 words)

	APC conjugation of Annexin V
		The primary difference is that there is no available sulfhydryl on Annexin V. To introduce one, a heterobifunctional linking reagent is used which reacts with Annexin V lysines with one end of the molecule, and has a sulfhydryl on its other end.
		This sulfhydryl is reacted with the SMCC-derivatized APC through reductive cross-linking.
		Note: for conjugations which fail or are poor, it may help to increase or decrease the amount of SMCC with respect to APC, or to use an alternative heterobifunctional crosslinking reagent.
	www.drmr.com /abcon/AxVAPC.html (1418 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations (Site not responding. Last check: 2007-09-07)
		Evaluation of the functional significance of sulfhydryl groups in the cell membrane depends in part on certain unpredictable properties of protein sulfhydryl groups.
		These include problems of specificity related to sulfhydryl reacting reagents used to determine sulfhydryl content, relative reactivity of the sulfhydryl groups themselves, and existence of functionally unresponsive sulfhydryl groups along with those essential for the physiological activity under study.
		For example, studies of the human red cell membrane or ghost have permitted classification of the membrane sulfhydryl groups on the basis of their activity with various reagents.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=4122938 (317 words)

	Trapping and Identification of Folding Intermediates by Mass Spectrometry
		A different aliquot of the fraction labeled as peak 2 in Figure 1 was subjected to partial reduction and further cyanylation of the nascent sulfhydryls; an aliquot of this reaction mixture was subjected to HPLC to give the separation shown in Figure 3.
		Conventional methodology to quench the folding process utilizes the alkylation of sulfhydryl groups by iodoacetate (iodoacetic acid or iodoacetamide) under alkaline conditions, although the fidelity of iodoacetate trapping was recently questioned.
		Cyanylation of sulfhydryl groups has rarely been used as an analytical reaction even though the thiolate anion is one of the most reactive functional groups in proteins.
	www.abrf.org /JBT/Articles/JBT0014/JBT0014.html (2694 words)

	QSOX sulfhydryl oxidase in rat adenohypophysis: localization and regulation by estrogens -- Tury et al. 183 (2): 353 -- ...
		QSOX sulfhydryl oxidase in rat adenohypophysis: localization and regulation by estrogens -- Tury et al.
		QSOX sulfhydryl oxidase in rat adenohypophysis: localization and regulation by estrogens
		The expression of the rat quiescin sulfhydryl oxidase (rQSOX)
	joe.endocrinology-journals.org /cgi/content/abstract/183/2/353 (247 words)

	Calcium Release and Subsequent Development Induced by Modification of Sulfhydryl Groups in Porcine Oocytes -- ...
		Sulfhydryl groups are the most reactive groups on proteins,
		sulfhydryl groups on the Ca release protein [30].
		Chiamvimonvat N, O'Rourke B, Kamp TJ, Kallen RG, Hofmann F, Flockerzi V, Marban E. Functional consequences of sulfhydryl modification in the pore-forming subunits of cardiovascular Ca and Na channels.
	www.biolreprod.com /cgi/content/full/60/6/1384 (4113 words)

	Albumin is a major serum survival factor for renal tubular cells and macrophages through scavenging of ROS -- Iglesias ...
		The reaction of 5,5'-dithio-bis(2-nitrobenzoic acid) (DTNB) with free sulfhydryl groups was used to determine the free sulfhydryl
		Oxidation and/or chemical blockade of the free sulfhydryl group in dBSA inhibits survival activity.
		Sulfhydryl groups and peroxidase-like activity of albumin as scavenger of organic peroxides.
	ajprenal.physiology.org /cgi/content/full/277/5/F711 (6967 words)

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