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Number Description
24500NHS (N-hydroxysuccinimide), 25 g
Molecular Weight: 115.10 CAS # 6066-82-6
N
O HO
24510 24520 24525 Sulfo-NHS (N-hydroxysulfosuccinimide), 500 mg
Sulfo-NHS, No-Weigh™ Format, 8 × 2 mg microtubes
Sulfo-NHS, 5 g
Molecular Weight : 217.14
CAS # 106627-54-7
N
O
HO
S
O
O
O
Na Storage: Upon receipt, store at 4°C. Product shipped at ambient temperature.
Introduction
NHS and Sulfo-NHS are used to prepare amine-reactive esters of carboxylate groups for chemical labeling, crosslinking and solid-phase immobilization applications. Carboxylates (-COOH) may be reacted to NHS or Sulfo-NHS in the presence of a carbodiimide such as EDC (Product No. 22980), resulting in a semi-stable NHS or Sulfo-NHS ester, which may then be reacted with primary amines (-NH2) to form amide crosslinks (Figure 1). Although NHS or Sulfo-NHS is not required for carbodiimide reactions, their use greatly enhances coupling efficiency. Furthermore, using NHS or Sulfo-NHS makes it possible to perform a two-step reaction.永芳
Both NHS and Sulfo-NHS are soluble in aqueous and organic solvents. Activation with NHS, however, decreases water-solubility of the modified carboxylate molecule, while activation with Sulfo-NHS preserves or increases water-solubility of the modified molecule, by virtue of the charged sulfonate group. Although prepared NHS or Sulfo-NHS esters are sufficiently stable to process in a two-step reaction scheme, both groups will hydrolyze within hours or minutes, depending on water-content and pH of the reaction solution. (NHS esters have a half-life of 4-5 hours at pH 7, 1 hour at pH 8 and only 10 minutes at pH 8.6.)1-3 Procedures for extraction and drying can be developed to prepare stable NHS-activated molecules, but best results are obtained when NHS-activated molecul
es are used promptly for reaction to the amine-containing targets. The activation reaction with EDC and Sulfo-NHS is most efficient at pH 4.5-7.2, and EDC reactions are often performed in MES buffer (Product No. 28390) at pH 4.7-6.0. Reaction of Sulfo-NHS-activated molecules with primary amines is most efficient at pH 7-8, and Sulfo-NHS-ester reactions are usually performed in phosphate-buffered saline (PBS) at pH 7.2-7.5. For best results in two-step reactions, perform the first reaction in MES buffer (or other non-amine, non-carboxylate buffer) at pH 5-6, then raise the pH to 7.2-7.5 with phosphate buffer (or other non-amine buffer) immediately before reaction to the amine-containing molecule.4 EDC reactions can be quenched with 2-mercaptoethanol (2-ME), or the excess reagent can simply be removed (as well as the reaction pH adjusted) by buffer-exchange with a desalting column (see Related Products). For additional discussion of EDC/NHS chemistry, including many example applications and protocols, consult the book by Hermanson(see Related Products).
NHS and Sulfo-NHS
Sulfo-NHS NHS ester
Figure 1. Reactions involving EDC, including activation as an NHS ester.
Procedure for EDC/NHS Crosslinking of Carboxylates with Primary Amines
A.Additional Materials Required
•Activation Buffer: 0.1 M MES (2-[morpholino]ethanesulfonic acid), 0.5 M NaCl, pH 6.0. Alternatively, use MES Buffered Saline, Product No. 28390 (see Related Pierce Products)
•Phosphate-buffered Saline (PBS): 0.1 M sodium phosphate, 0.15 M NaCl, pH 7.2-7.5 (e.g., Product No. 28372) •Protein #1: Prepare 1 ml of Protein #1 in activation buffer at ~10 mg/ml
•Protein #2, lyophilized or dissolved at 1-10 mg/ml in PBS or other amine-free buffer, pH 7-8
•EDC (1-ethyl-3-[3-dimethylaminopropyl]carbodiimide), Product No. 22980 − for best results, use a 10-fold molar excess of EDC (MW = 191.7) to Protein #1
•(Optional) 2-Mercaptoethanol, Product No. 35600, for quenching EDC activation reaction
•(Optional) Desalting column of appropriate size for the volume of final activation reaction (e.g., Zeba™ Desalt Spin Columns, see Related Products). If intending to use this method for clean-up and buffer exchange of the activation reaction, be sure to equilibrate the desalting column so that it is ready for use when needed in Section C. •(Optional) Hydroxylamine, Product No. 26103, for quenching the amine reaction
纸质材料
B.NHS-ester Activation
•No-Weigh Format Handling: Immediately before use, puncture the microtube foil with a pipette tip, add water and mix by pipetting up and down. After use, cut the used microtube from the microtube st
rip and discard. Store the unused microtubes in the foil pouch provided.
1.Add 0.4 mg of EDC (final concentration 2 mM) directly to 1 ml of Protein #1, which based on a 50 kDa protein, results
in a 10-fold molar excess of EDC to Protein #1.
2.Add either 0.6 mg of NHS or 1.1 mg of Sulfo-NHS to the reaction (final concentration 5 mM). If using the No-Weigh
Format of Sulfo-NHS add 40 µl of ultrapure water or Activation Buffer to an individual microtube, which yields 230 mM; then add 22 µl of the dissolved reagent to the 1 ml reaction (final concentration 5 mM).
3.Mix reaction components well and react for 15 minutes at room temperature.
4.(Optional): Add 1.4 µl of 2-mercaptoethanol (final concentration of 20 mM) to inactivate the EDC.
5.(Optional): Separate activated Protein #1 from excess EDC, EDC-byproducts, NHS and (if used) 2-mercaptoethanol
using an appropriate size desalting column that has been equilibrated with PBS. Follow desalting column instructions and recover the fraction containing the activated protein. If using absorbance at 280 nm to identify fractions containing protein, be aware that NHS and Sulfo-NHS absorb strongly at 260-280 nm.
C.Amine Reaction
1.If step B.5 was not performed (i.e., buffer not exchanged using a desalting column), then increase buffer pH above 7.0
using concentrated PBS or other non-amine buffer such as sodium bicarbonate.
2.Add Protein #2 to the solution containing activated Protein #1.
3.Mix the solution well and then allow reaction to proceed for 2 hours at room temperature.
4.(Optional): Quench reaction by adding hydroxylamine to a final concentration of 10 mM. The excess hydroxylamine
reacts to all NHS esters remaining on the surface of Protein #1, resulting in conversion of the original carboxyl groups to
a hydroxamic acid. Alternative quenching reagents include 20-50 mM Tris, lysine, glycine and ethanolamine. Addition
of base to raise the pH > 8 will promote hydrolysis of the NHS esters, thereby regenerating the original carboxyl groups.
Related Products
20036 Bioconjugate Techniques (Book), Greg Hermanson, Academic Press (2008)
(1-ethyl-3-[3-dimethylaminopropyl]carbodiimide),5 g
22980 EDC
28390 BupH™ MES Buffered Saline, 10 packs, each pack results in 0.1 M MES, 0.9% NaCl, pH 4.7 when dissolved in 500 ml water
Buffered Saline Packs, 40 packs, each pack results in 0.1 M sodium phosphate,
Phosphate
28372 BupH
0.15 M NaCl, pH 7.2 when dissolved in 500 ml water
89891 Zeba Desalt Spin Columns, 5 ml, 5/pkg, for desalting or buffer exchanging 0.5-2.0 ml samples 89892 Zeba Desalt Spin Columns, 5 ml, 25/pkg, for desalting or buffer exchanging 0.5-2.0 ml samples 89893 Zeba Desalt Spin Columns, 10 ml, 5/pkg, for desalting or buffer exchanging 0.7-4.0 ml samples 89894 Zeba Desalt Spin Columns, 10 ml, 25/pkg, for desalting or buffer exchanging 0.7-4.0 ml samples Cited References
1.Lomant, A.J. and Fairbanks, G. (1976). Chemical probes of extended biological structures: synthesis and properties of the cleavable cross-linking
reagent [35S] dithiobis(succinimidyl propionate). J. Mol. Biol.104:243-61.关于上班这件事
2.Staros, J.V., et al. (1986). Enhancement by N-hydroxysulfosuccinimide of water-soluble carbodiimide-mediated coupling reactions. Anal. Biochem.
156:220-2.
3.Cuatrecaseas, P. and Parikh, I. (1972). Adsorbents for affinity chromatography. Use of N-hydroxysulfosuccinimide esters of agarose. Biochemistry
11::291-9.
4.Grabarek, Z. and Gergely, J. (1990). Zero-length crosslinking procedure with the use of active esters. Anal. Biochem. 185:131-
5.
Product References
氰化亚金钾Boels, K., et al. (2001). The neuropeptide head activator induces activation and translocation of the growth-factor-regulated Ca2+-permeable channel GRC. J.
Cell Sci.114:3599-606.
Byun, C.H., et al. (2001). Identification of the peptides that inhibit the function of human monoclonal thyroid-stimulating antibodies from phage-displayed peptide library. J. Clin. Endocrinol. Metab.86:3311-18.
Epstein, A. L. (2003). Identification of a protein fragment of interleukin 2 responsible for vasopermeability. J. Natl. Cancer Inst. 95: 741-9.
Nogami, K., et al. (2004). Mechanisms of interactions of Factor X and Factor Xa with the acidic region in the Factor VIII A1 domain. J. Biol. Chem.
279:3104-13.
Nyman, T., et al. (2002). A cross-linked profilin-actin heterodimer interferes with elongation at the fast-growing end of F-actin. J. Biol. Chem. 277:15828-
33.
Remmert, K., et al. (2004). CARMIL is a bona fide capping protein interactant. J. Biol. Chem.279: 3068-77.
Romaniouk, A.V., et al. (2004). Synthesis of a novel photoaffinity derivative of 1-deoxynojirimycin for active site-directed labeling of glucosidase I.
Glycobiology14:301-10.
Van Troys, M., et al. (2004). TetraThymosinbeta is required for actin dynamics in Caenorhabditis elegans and acts via functionally different actin-binding repeats. Mol. Biol. Cell15:4735-48.
Witt, S., et al. (2004). Comparative biochemical analysis suggests that vinculin and metavinculin cooperate in muscular adhesion sites. J. Biol. Chem.
279:31533-43.
Sulfo-NHS Technology is protected by U.S. Patent numbers 6,407,263; 5,872,261; 5,892,057 and 5,942,628.
This product (“Product”) is warranted to operate or perform substantially in conformance with published Product specifications in effect at the time of sale, as set forth in the Product documentation, specifications and/or accompanying package inserts (“Documentation”) and to be free from defects in material and workmanship. Unless otherwise expressly authorized in writing, Products are supplied for research use only. No claim of suitability for use in applications regulated by FDA is made. The warranty provided herein is valid only when used by properly trained individuals. Unless otherwise stated in the Documentation, this warranty is limited to one year from date of shipment when the Product is subjected to normal, proper and intended usage. This warranty does not extend to anyone other than the original purchaser of the Product (“Buyer”).
No other warranties, express or implied, are granted, including without limitation, implied warranties of merchantability, fitness for any particular purpose, or non infringement. Buyer’s exclusive remedy for non-conforming Products during the warranty period is limited to replacement of or refund for the non-conforming Product(s).
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There is no obligation to replace Products as the result of (i) accident, disaster or event of force majeure, (ii) misuse, fault or negligence of or by Buyer, (iii) use of the Products in a manner for which they were not designed, or (iv) improper storage and handling of the Products. Current versions of product instructions are available at www.thermo/pierce. For a faxed copy, call 800-874-3723 or contact your local distributor.
© 2009 Thermo Fisher Scientific Inc. All rights reserved. Unless otherwise indicated, all trademarks are property of Thermo Fisher Scientific Inc. and its subsidiaries. Printed in the USA.
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