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Topic: Sulfhydryl group

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Disulphide bond

Dative covalent bond

Covalent bond

Cysteine

Carbon monoxide

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	:: Curcuminoids :: Pharmacological Effects
		It was observed that turmeric (4.0 g/kg/day) and curcumin (0.4 g/kg/day) had modulatory effects on the hepatic levels of glutathione-S-transferase, acid soluble sulfhydryl (-SH), levels, cytochrome b5 and cytochrome P450 in both the mother and the pup.
		Animals in group 1 were treated with one of the test compounds, lycopene (0.005% and 0.0025%) or fucoxanthin (0.01%) in the drinking water and lutein (0.05%), curcumin (0.5%) or THC (0.5% and 0.2%) in the diet from weeks 5-12.
		Two of the groups were treated with different dosages of a turmeric extract and the third group (control) with a curcumin-free solution.
	www.curcuminoids.com /Pharmacological.htm (5909 words)

	Biology
		The carbonyl group is a section of the functional groups that introduce the concepts of aldehydes and ketones.
		The hydroxyl group is a memeber of the functional groupsand consists of a hydrogen atom joined to an oxygen atom by a polar covalent bond.
		The organic function group which consists of a sulfur atom bonded to an atom of hydrogen is known as the sulfhydryl group.
	www.msu.edu /~browerst/ChFiveVoc.html (425 words)

	Sulfhydryl group - Definition, explanation
		In organic chemistry, a sulfhydryl group or thiol group is a functional group composed of a sulfur and a hydrogen atom (-SH).
		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-).
	www.calsky.com /lexikon/en/txt/s/su/sulfhydryl_group.php (403 words)

	The Perth Group HIV-AIDS Debate Website
		Gallo and his group state "The cytopathic activity in vitro, the repeated isolation from patients with AIDS and people at risk, and results of the seroepidemiological studies are all consistent with HTLV-III being the aetiological agent of AIDS"(56).
		Furthermore the pattern of pairing of sulfhydryl groups to form disulfides is not an invariant property of the linear chain but depends on extrinsic factors including the redox(59,60).
		According to Gallo and his group "...epidemiological studies carried out chiefly by the Centers for Disease Control in Atlanta, Georgia, particularly those pertaining to transmission of the disease by filtered Factor VIII in blood transfusion cases strongly implicated a viral agent" as the aetiological factor of AIDS(56).
	www.theperthgroup.com /SCIPAPERS/reappraisalofaids.html (7219 words)

	[No title]
		Sulfhydryl group of cysteine can be considered also as a very strong reducing factor, which is very important for activity of many proteins, a oligopeptides (glutathione), has a strong influence on redox potential of environment in certain compartments in vivo, and can form a center of the active site of some enzymes (e.g.
		The presence of sulfhydryl group where hydrogen can be easily replaced by radicals and other groups, makes it possible to form a covalent bond with the other molecules.
		Sulfhydryl group of catalytic Cys25 of papain acts similarly to Ser 195 in serine proteinases.
	www.cryst.bbk.ac.uk /pps97/assignments/projects/leluk/project.htm (2183 words)

	Fatty Acids -- Enzymes and Isolated Reactions: Activities of FA Synthase
		Mechanistically this is a two step process, in which the group is first transferred to the ACP (acyl carrier peptide), and then to the cysteine -SH group of the condensing enzyme domain.
		In the third reaction the acetyl group is transferred to the malonyl group with the release of carbon dioxide:
		The butyryl group is then transferred from the ACP sulfhydryl group to the CE sulfhydryl:
	library.med.utah.edu /NetBiochem/FattyAcids/5_2b.html (333 words)

	Bionational Pharmaceuticals
		In the NAC-treated group, 4-month follow-up generally showed an improvement in VA and a significant improvement in glare sensitivity at red and green targets was documented in worse and better eyes using a critical cut point halometer score for driving.
		The lens opacity degree correlates with the level of the LPO fluorescent end-product accumulation in its tissue, accompanied by sulfhydryl group oxidation of lens proteins due to a decrease of reduced glutathione concentration in the lens.
		Group I of patients demonstrated the variability in the densitometric readings of the lens cloudings, negative advance in glare sensitivity over 6 months and gradual deterioration of VA and gross transmissivity of lenses over 24 months compared with the baseline and 6-month follow-up examinations.
	bionational.com /xcart/catalog/information.html (2353 words)

	Thiol - Wikipedia, the free encyclopedia
		The thiol group is the sulfur analog of the hydroxyl group (-OH) found in alcohols.
		When the thiol 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-).
		The chemicals used in hair straightening are reductants that reduce cystine disulfide bridges to free cysteine sulfhydryl groups, while chemicals used in hair curling are oxidants that oxidize cysteine sulfhydryl groups to form cystine disulfide bridges.
	en.wikipedia.org /?title=Sulfhydryl (736 words)

	Method for radiolabeling proteins - Patent 5061641
		A protein containing at least one pendant sulfhydryl group is directly radiolabeled with a radiometal which binds tightly to sulfhydryl groups, using one or more pendant sulfhydral groups on the protein as endogenous ligands and optionally using an exogenous ligand which binds tightly to the radiometal ion to further stabilize the chelate.
		A stabilized radiolabeled protein, comprising a protein containing at least one pendant sulfhydryl group bound to a radiometal ion of a radionuclide that binds tightly to sulfhydryl groups, said radiometal ion also being bound to an exogenous ligand which tightly binds to said radiometal ion.
		In situ generation of sulfhydryl groups, e.g., by cleavage of divalent fragments to their monovalent components, and separation of the resultant thiol-containing proteins also can be effected using a spin column.
	www.freepatentsonline.com /5061641.html (5510 words)

	Serotonin
		In biomedical studies, thimerosal is used as a sulfhydryl reagent, and as a calcium-mobilizing agent.
		The ability of thimerosal to act as a sulfhydryl group is related to the presence of mercury.
		Relatively little study has been devoted to the mechanism of the reaction of thimerosal with the sulfhydryl group; the sulfhydryl reactive capacity is mostly concluded on the basis of inactivation of the effect by dithiothreitol (DTT).
	www.vaccinetruth.org /serotonin.htm (342 words)

	Chapter 4 Student Guide
		Small characteristic groups of atoms (functional groups) are frequently bonded to the carbon skeleton of organic molecules.
		Hydroxyl group = A functional group that consists of a hydrogen atom bonded to an oxygen atom, which in turn is bonded to carbon (-OH).
		Carboxyl group = Functional group that consists of a carbon atom which is both double-bonded to an oxygen and single-bonded to the oxygen of a hydroxyl group (-COOH).
	www.niles-hs.k12.il.us /jacnau/chpt4student.html (1269 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 (926 words)

	U.S. Patent: 5006334 - Antigenic modification of polypeptides - *
		The generation of free thiol groups by reduction of disulfide bridges in naturally occuring forms of proteins may affect the cross-reactivity of the antibodies produced when a modified polypeptide derived from the protein or a fragment thereof is injected into an animal.
		A further group of polypeptides which may be modified by the instant processes to yield modified polypeptides useful for fertility control are polypeptides derived from zona pellucida or from sperm, and peptides having a sequence corresponding to at least part of the sequence of such a zona pellucida or sperm antigen.
		Additional modifying groups for modifying whole hormones or their subunits are those groups obtained by reaction of the polypeptides with dinitrophenol, trinitrophenol, and S-acetomercaptosuccinic anhydride, while suited for utilization as carrier-modifiers in conjunction with fragments, are polytyrosine in either straight or branched chains, polyalanines in straight or branched chains, biodegradable polydextrans, e.g.
	www.everypatent.com /comp/pat5006334.html (14142 words)

	Thioether - Wikipedia, the free encyclopedia
		A thioether (also known as a sulfide) is a functional group in organic chemistry that has the structure R-S-R, where R is any organic group.
		Because the chemical properties of both atoms are similar, as they are in the same group in the periodic table, the chemical properties of the two functional groups are similar as well.
		This functional group has minor importance in biology, most notably in the amino acid methionine.
	en.wikipedia.org /wiki/Thioether (178 words)

	ch4
		Carbonyl Group = Function group that consists of a carbon atom double-bonded to oxygen (-CO).
		Amino Group = Functional group that consists of a nitrogen atom bonded to two hydrogens and to the carbon skeleton (-NH2).
		Sulfhydryl group = Functional group which consists of an atom of sulfur bonded to an atom of hydrogen (-SH).
	www.biol.andrews.edu /fb/fall/ch4.htm (1030 words)

	Amino Acid Synthesis
		Also, in animals, the sulfhydryl group of cysteine is derived from methionine, which is an essential amino acid, so cysteine can also be considered essential.
		Glutamate-5-semialdehyde is transaminated to ornithine and glutamate is the amino group donor.
		The methyl group on the sulfonium ion of SAM is highly reactive, so it is not surprising to find that SAM is a methylating agent in some reactions.
	www.rpi.edu /~bellos/new_page_2.htm (2314 words)

	Untitled
		Amino acids are linked by a dehydration synthesis reaction resulting in a covalent bond between the amino group of one amino acid and the carboxyl group of another amino acid.
		The amino acid R groups (side chains, shown in brown) stick out to the side of the coil and above or below the plane of the pleated sheet and therefore are not directly involved in the secondary structure.
		Thus the positions of the R groups sticking out of the coil and sheet are determined by the positions of the particular amino acid "letters" in the protein "word" and determine how the protein will fold into its tertiary structure and therefore what its final shape will be.
	www.botany.uga.edu /~darley/btny1210/Sept21Mon.htm (899 words)

	Fatty Acids -- Enzymes and Isolated Reactions: Activities of FA Synthase
		Mechanistically this is a two step process, in which the group is first transferred to the ACP (acyl carrier peptide), and then to the cysteine -SH group of the condensing enzyme domain.
		In the third reaction the acetyl group is transferred to the malonyl group with the release of carbon dioxide:
		The butyryl group is then transferred from the ACP sulfhydryl group to the CE sulfhydryl:
	www-medlib.med.utah.edu /NetBiochem/FattyAcids/5_2b.html (333 words)

	Organic Chemistry Primer (Site not responding. Last check: )
		functional group having the structure -NH and also with one or both hydrogens replaced with an R group is an amino group.
		sulfhydryl groups are found in the R group of the amino acid cysteine, there forming the basis of chemical reactions within proteins that serve to internally bind together polypeptide chains.
		For example, the acid in amino acid is a carboxyl group as are the acids in citric acid (a.k.a., tricarboxylic acid) and fatty acids (though not the acid in nucleic acids which instead is a phosphate group).
	www.mansfield.ohio-state.edu /~sabedon/biol4015.htm (3110 words)

	Amino Acids
		The only ionized groups in the finished protein will be the terminal amino and carboxyl groups and also any R groups that happen to contain acidic or basic groups.
		The sulfhydryl group of cysteine is a very weak acid with a pK of about 8.4.
		Removal of this charged group from the aqueous phase requires a large expenditure of energy and thus charged amino acids are found almost exclusively at the surface of proteins.
	class.fst.ohio-state.edu /fst605/lectures/Lect9.html (2018 words)

	LECTURE 1
		A functional group similar to the hydroxyl group is the sulfhydryl g roup, -SH.
		Organic molecules with a sulfhydryl group are refered to as th iols.
		This group has C forming a double bond with O. When carbon is in a carbonyl group it can therefore bind only with three atoms.
	www.ucc.uconn.edu /~giardina/LECTURE5.html (1353 words)

	Antigenic modification of polypeptides - Patent 4762913
		treating the resulting moiety with a sulfhydryl group-containing carrier biologically foreign to said animal, thereby causing reaction between said group T and said sulfhydryl group such that the carbon atom of said group T becomes bonded to the sulfur atom of said sulfhydryl group to form a thioether.
		Modification of the polypeptide is accomplished by attacting various kinds of modifying groups to proteinaceous hormones, non-hormonal proteins, subunits or specific fragments thereof according to methods knmown in the art.
		The maleiimido grouping of the above activators will react with sulfhydryl (SH)groups in the polypeptides to be modified under conditions whereby the opposite end (active ester end) of the reagent does not react with the amino groups present in the polypeptides.
	www.freepatentsonline.com /4762913.html (13826 words)

	Site-specific drug delivery patent invention (Site not responding. Last check: )
		A compound in accordance with claim 4, wherein said sulfhydryl-reactive group is a member selected from the group consisting of methanethiosulfonate esters, dithiopyridyl groups, cystine and maleimide.
		A compound in accordance with claim 1, wherein said anchoring group is methane thiosulfate, said linking group is a polyethylene glycol chain consisting of 8 to 10 ethylene glycol units, and propanolol.
		A method in accordance with claim 34, wherein said sulffiydryl-reactive group is a member selected from the group consisting of methanethiosulfonate esters, dithiopyridyl groups, cystine and maleimide.
	www.freshpatents.com /Site-specific-drug-delivery-dt20060112ptan20060009375.php?type=claims (965 words)

	BIOLOGY 1406
		Is a polar group; the bond between the oxygen and hydrogen is a polar covalent bond.
		Carboxyl group = Functional group that consists of a carbon atom which is both double-bonded to an oxygen and single-bonded to the oxygen of a hydroxyl group (
		Sulfhydryl group = Functional group which consists of an atom of sulfur bonded to an atom of hydrogen (
	www.accd.edu /SAC/biology/MrT/06web2/ch4.html (942 words)

	Protein Review
		is bonded to 3 side groups and a hydrogen.
		* The sulfhydryl group in one part of a polypeptide chain can covalently bond to a sulfhydryl in another region thus stabilizing a particular folding pattern in the mature protein.
		The prosthetic group of a protein often determines function.
	home.earthlink.net /~dayvdanls/ReviewProtein.htm (526 words)

	Acetylcysteine : by Ray Sahelian, M.D., health benefits of N-Acetyl-l-cysteine
		The author writes, “N-acetylcysteine is an excellent source of sulfhydryl groups, and is converted in the body into metabolites capable of stimulating glutathione synthesis, promoting detoxification, and acting directly as a free radical scavenger.
		Thirteen patients (11 percent) in the control group died, as did five (4 percent) in the standard-dose N-acetylcysteine group and three (3 percent) in the high-dose N-acetylcysteine group.
		One woman in the long-course group in whom initiation of Acetylcysteine treatment was delayed by 28 hours died of fulminant hepatic failure.
	www.raysahelian.com /acetylcysteine.html (4299 words)

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