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BS2G-d0 and BS2G-d4 Crosslinker Mass Pair

Heavy and light analogs of BS2G crosslinker for mass spectrometry proteomics analysis.

Pierce BS2G-d0/d4 Mass Tag Crosslinker Pair

Thermo Scientific Pierce BS2G-d0/d4 reagents form a matched set of heavy (deuterated) and light mass varieties of a short, amine-reactive crosslinker that facilitates the identification of crosslinked peptides by mass spectrometry.

The BS2G-d0/d4 reagents are mass-analogs of BS2G crosslinker. The d-zero variety (BS2G-d0) possesses ordinary hydrogen atoms while the d-four variety (BS2G-d4) contains four deuterium atoms that make it exactly four hydrogen mass units heavier. When the two varieties are mixed and used to crosslink interacting proteins, distinctive mass patterns result that enable unambiguous identification of the crosslinked molecules.


  • Deuterium-labeled BS2G and its standard hydrogen-only analog – specially manufactured for crosslinking protein structure:function analysis by mass spectrometry
  • Easy identification of crosslinked fragments – peptide masses differing by 4 units unambiguously identify crosslink at specific loci within a protein interaction structure
  • Application-specific instructions – help guide the first time user through the application
  • Method requires only microgram amounts of protein – excellent alternative to NMR or X-ray crystallography-based methods that require large amounts of protein, special solvents or crystal formation

Product Details:

Structure of BS2G-d4 deuterated heavy crosslinker Structure of BS2G-d0 light crosslinker
Structures of BS2G-d4 (left) and BS2G-d0 (right).

Addition of an equimolar mixture of two identical crosslinking agents that differ only in the number of deuterium atoms in their chemical structures provides a powerful method to identify low-abundance, singly-crosslinked peptides by mass spectrometry. Crosslinking protein interactions with BS2G-d0/d4 reagents generates distinctive mass patterns in which crosslinked peptides differ by 4 mass units after enzymatic digestion of the crosslinked protein or protein complex. Further analysis of the reaction products can yield low resolution three dimensional structure information.

BS2G-d0/d4 and BS3-d0/d4 reagents are homobifunctional, amine-reactive, non-cleavable, water-soluble crosslinking agents with defined spacer arm lengths. These reagents can act as molecular rulers for estimation of spatial relationships in protein structure-function studies. Both light and deuterated analogs react efficiently with primary amine (–NH2) at pH 7-9 to form stable amide bonds. Proteins generally contain several primary amines in the side chain of Lysine (K) residues and the N-terminus of each polypeptide that are available as targets for the two sulfo-NHS ester reactive groups found in each of these reagents. These reagents are supplied as a sodium salt and are soluble in water at a concentration up to 10mM.


  1. Kalkof, S., et al. (2005). Probing laminin self-interaction using isotope-labeled crosslinkers and ESI-FTICR mass spectrometry. Amer. Soc. Mass Spec. 53rd Conference (San Antonio, TX). Poster #352.
  2. Schmidt, A., et al. (2005). Studying calmodulin / adenylyl cyclase 8 interaction using isotope-labeled crosslinkers and FTICR mass spectrometry. Amer. Soc. Mass Spec. 53rd Conference (San Antonio, TX). Poster #361.
  3. Sinz, A. (2003). Chemical crosslinking and mass spectrometry for mapping three-dimensional structures of proteins and protein complexes. J. Mass Spectrom. 38, 1225-1237.
  4. Dihazi, G.H. and Sinz, A. (2003). Mapping low-resolution three-dimensional protein structure using chemical crosslinking and Fourier transform ion-cyclotron resonance mass spectrometry. Rapid Commun. Mass Spectrom. 17, 2005-2014.
  5. Kalkhof, S. et al. (2005). Chemical crosslinking and high-performance Fourier transform ion cyclotron resonance mass spectrometry for protein interaction analysis: Application to a calmodulin/target peptide complex. Anal. Chem. 77, 495-503.
  6. Back, J.W. et al. (2003). Chemical crosslinking and mass spectrometry for protein structural modeling. J. Mol. Biol. 331, 303-313.
  7. Pearson, K. M., et al. (2002). Intramolecular crosslinking experiments on cytochrome c and ribonuclease A using an isotope multiplet method. Rapid Commun. Mass Spectrom. 16, 149-159.
  8. Muller, D.R. et al. (2001). Isotope-tagged crosslinking reagents. A new tool in mass spectrometric protein interaction analysis. Anal. Chem. 73, 1927-1934
  9. Schilling, B. et al. (2003). MS2 assign, automated assignment and nomenclature of tandem mass spectra of chemically crosslinked peptides. J. Am. Soc. Mass Spectrom. 14, 834-850.
  10. Peri, S. et al. (2001). GPMAW- a software tool for analyzing proteins and peptides. Trends Biochem. Sci. 26, 687-689.

Related Resources:

Review of Quantitative Proteomics
NHS Ester Crosslinker Chemistry

Related Products:


Ordering Information
Product # Description Pkg. Size Instructions MSDS CofA Price
21610 BS2G-d0
Formulation: Bis(sulfosuccinimidyl) glutarate-d0; powder solid
Sufficient For: 19mL of typical 1X (1mM) reaction solution, or approx. 5 uses at 2mg reagent per use
10mg Product Instructions for product #21610 BS2G-d0 MSDS for product #21610 BS2G-d0 Certificate of Analysis for product #21610 BS2G-d0 $148.00

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21615 BS2G-d4
Formulation: Bis(sulfosuccinimidyl) 2,2,4,4-glutarate-d4; powder solid
Sufficient For: 19mL of typical 1X (1mM) reaction solution, or approx. 5 uses at 2mg reagent per use
10mg Product Instructions for product #21615 BS2G-d4 MSDS for product #21615 BS2G-d4 Certificate of Analysis for product #21615 BS2G-d4 $333.00

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Instructions | MSDS | CofA
Product Instructions | MSDS | CofA  

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