Thermo Scientific™

DSSO (disuccinimidyl sulfoxide)

Catalog number:  A33545

 Related applications:

Protein Mass Spectrometry Analysis

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DSSO (disuccinimidyl sulfoxide) is an MS-cleavable and membrane-permeable crosslinker that contains an amine-reactive N-hydroxysuccinimide (NHS) ester at each end of a 7-carbon spacer arm. It facilitates analysis of protein structure and complex interactions using mass spectrometry. DSSO has similar reactivity to DSS and BS3, but contains a linker that can be cleaved in the gas phase during tandem MS (MS/MS) using collision-induced dissociation (CID). The ability to cleave cross-linked peptides during MS/MS enables MS3 acquisition methods, which facilitate peptide sequencing using traditional database search engines. The MS cleavage of DSSO also generates diagnostic ion doublets during MS2, which enables identification of cross-linked peptides from dead-end modifications and searching using novel database search engines such as XlinkX.

Features of DSSO:
• Reactive groups: NHS ester (both ends)
• Reactive towards: amino groups (primary amines)
• Amine-reactive NHS ester reacts rapidly with any primary amine-containing molecule
• Membrane permeable, allowing for intracellular crosslinking
• High-purity, crystalline reagent can be used to create high-purity conjugates
• MS-cleavable
• Water-insoluble (dissolve first in DMF or DMSO)

Lot specifications:
• Purity: > 90% by quantitative NMR (the highest standard in crosslinking purity)

Chemical crosslinking in combination with mass spectrometry is a powerful method to determine protein-protein interactions. This method has been applied to recombinant and native protein complexes, and more recently, to whole cell lysates or intact unicellular organisms in efforts to identify protein-protein interactions on a global scale. Both traditional non-cleavable and MS-cleavable crosslinkers provide insight into the identification of protein-protein interaction sites, but MS-cleavable crosslinkers are advantageous due to their ability to be cleaved using different types of gas phase fragmentation methods (e.g., CID, HCD, ETD, and EtHCD) and levels of tandem mass spectrometry (e.g., MS2 and MS3) in order to improve identification of cross-linked peptides.

For high resolution analysis of the crosslinked peptides, the recommended LC column for Nanospray Flex source is Acclaim PepMap 100 C18 LC Column (Cat. No. 164940 or 164568). For EASY-Spray source, the recommended LC column is EASY-Spray C18 LC Column (Cat. No. ES800 or ES804).


Final Product: Molecule
Product Size: 10 x 1 mg

Contents & storage

Store at 2–8°C.


Manuals & protocols