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Sulpho-SANPAH (Sulphosuccinimidyl-6-(4′-azido-2′-nitrophenylamino)hexanoate), Pierce™

Catalog Number: (PIER22589)

Supplier: Thermo Fisher Scientific

Description: Thermo Scientific Pierce Sulfo-SANPAH is a hetero-bifunctional crosslinker that contains an amine-reactive N-hydroxysuccinimide (NHS) ester and a photoactivatable nitrophenyl azide.

UOM: 1 * 50 mg

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SMPT (4-succinimidyloxycarbonyl-alpha-methyl-α(2-pyridyldithio)toluene), Pierce™

Catalog Number: (PIER21558)

Supplier: Thermo Fisher Scientific

Description: Thermo Scientific Pierce SMPT is a long-chain crosslinker for amine-to-sulfhydryl conjugation via NHS-ester and pyridyldithiol reactive groups that form strong (hindered) yet cleavable (reducible) disulfide bonds with cysteine sulfhydryls..

UOM: 1 * 50 mg

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SMCC (N-Succinimidyl 4-(N-Maleimidomethyl)cyclohexanecarboxylate) ≥85%

Supplier: AAT BIOQUEST

Description: SMCC is a non-cleavable and membrane permeable crosslinker with a spacer arm of 8.3 Å. It contains an amine-reactive succinimidyl ester (SE) and a sulfhydryl-reactive maleimide group. NHS esters react with primary amines at pH 7 to 9 to form stable amide bonds. Maleimides react with sulfhydryl groups at pH 6.5 to 7.5 to form stable thioether bonds. The SE group of SMCC is reacted with lysine residues on the carrier protein, converting them to reactive maleimides. SMCC is a reagent that is widely used for generating stable maleimide-activated carrier proteins that can spontaneously react with sulfhydryls. Alternatively these relatively stable maleimide-activated intermediates may be lyophilized and stored for later conjugation to a hapten.

Sulpho-SMCC (3-Sulpho-N-succinimidyl-4-(N-maleimidomethyl)cyclohexane-1-carboxylate sodium salt), No-Weigh™ Format, Pierce™

Catalog Number: (PIERA39268)

Supplier: Thermo Fisher Scientific

Description: Thermo Scientific Pierce Sulfo-SMCC, No-Weigh Format is a water-soluble, amine-to-sulfhydryl crosslinker that contains NHS-ester and maleimide reactive groups at opposite ends of a medium-length cyclohexane spacer arm (8.3 angstroms).

UOM: 1 * 20 mg

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Sulpho-SMCC (3-Sulpho-N-succinimidyl-4-(N-maleimidomethyl)cyclohexane-1-carboxylate sodium salt), Pierce™

Supplier: Thermo Fisher Scientific

Sulpho-LC-SPDP (Sulphosuccinimidyl 6-(3'-(2-pyridyldithio)propionamido)hexanoate) ≥90%, Pierce™

Catalog Number: (PIER21650)

Supplier: Thermo Fisher Scientific

Description: Thermo Scientific Pierce Sulfo-LC-SPDP is a water-soluble, long-chain crosslinker for amine-to-sulfhydryl conjugation via NHS-ester and pyridyldithiol reactive groups that form cleavable (reducible) disulfide bonds with cysteines.

UOM: 1 * 50 mg

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Urea ≥98%, white powder for molecular biology

Supplier: MP Biomedicals

Description: Applications:
Urea is used for the denaturation of proteins and as a mild solubilization agent for insoluble or denatured proteins. Useful for renaturing proteins from samples already denatured with 6 M guanidine chloride such as inclusion bodies and in the extraction of the mitochondrial complex. It is commonly used to solubilize and denature proteins for denaturing isoelectric focusing and two-dimensional electrophoresis and in acetic acid-urea PAGE gels. May be used with guanidine hydrochloride and dithiothreitrol (DTT) in the refolding of denatured proteins into their native or active form. Urea is used in cell or tissue culture media to increase the osmolality. Urea has also been used as fertilizer because of the easy availability of nitrogen; in animal feeds; it is reacted with aldehydes to make resins and plastics; condensed with malonic ester to form barbituric acid; used in the paper industry to soften cellulose.
Biochem/physiol Actions:
Urea has been shown to act as an aldosterone antagonist in the development of peanut agglutinin binding in cultured embryonic renal collecting duct epithelial cells. Urea is the principal end product of nitrogen metabolism in most mammals, formed by the enzymatic reactions of the Kreb's cycle.
Typical Working Concentration:
The use of 2 g/L urea in the culture of Kluyveromyces marxianus to produce a thermostable extracellular lipase has been described. Urea is typically used at a concentration of 8 M for protein denaturation or solubilization. A final concentration of 5 M urea is commonly used in molecular biology for sequencing gels. To prevent carbamylation, do not heat urea containing buffers above 37 °C