Sulfo-SBED Biotin Label Transfer Reagent, No-Weigh™ Format

Sulfo-SBED Biotin Label Transfer Reagent is covered under our general 1-year warranty and is guaranteed to be fully functional for 12 months from the date of shipment, if stored as recommended. Please see section 8.1 of our Terms & Conditions of Sale (https://www.thermofisher.com/content/dam/LifeTech/Documents/PDFs/Terms-and-Conditions-of-Sale.pdf) for more details.

Find additional tips, troubleshooting help, and resources within our Protein Purification and Isolation Support Center.

The No-Weigh product format, where small amounts of reagent are pre-weighed and packaged separately, prevents the contamination and loss of reagent reactivity over time associated with repetitive opening and closing of a single vial. This format enables use of a fresh vial of reagent each time and eliminates the hassle of weighing out small amounts of reagent. Please view additional information and the video at: https://www.thermofisher.com/us/en/home/life-science/protein-biology/protein-labeling-crosslinking/no-weigh-packaging.html

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

We offer Sufo-SBED (Cat. Nos. 33033 and A39260).

Find additional tips, troubleshooting help, and resources within our Protein Purification and Isolation Support Center.

We offer the following crosslinkers for protein to nucleic acids: formaldehyde (Cat. No. 28906), SPB (Cat. No. 23013), SDAD (Cat. No. 26169), sulfo-SDAD (Cat. No. 26175), and sulfo-SBED (Cat. No. A39260).
Formaldehyde can be used for DNA-DNA crosslinking as well as DNA-protein crosslinking. While it is good for crosslinking proteins that are in direct contact with DNA, formaldehyde cannot link proteins that may be bound in a complex with other proteins but are not in direct contact with DNA. EGS or DSG can crosslink proteins to other proteins that are in direct contact with DNA and crosslinked to DNA by formaldehyde.
SPB, Sulfo-SDAD, and Sulfo-SBED are all photoreactive crosslinkers. SPB is an NHS-ester and psoralen heterobifunctional crosslinker that conjugates primary amines on proteins to DNA via photo-activated intercalation of psoralen to pyrimidine bases. The psoralen tricyclic planar ring system intercalates into double-stranded, and to a lesser extent, single-stranded DNA and RNA. The photoreactive psoralen group provides more selective covalent binding to nucleic acids than either phenyl azide or diazerine linkers, which makes SPB the best choice. The diazerine on sulfo-SDAD and the phenyl azide on sulfo-SBED are not selective for nucleic acids and can crosslink other biomolecules in the same besides any protein-DNA interactions. Sulfo-SBED involves biotin transfer rather than actual linking.

Find additional tips, troubleshooting help, and resources within our Protein Purification and Isolation Support Center.