DTSSP Crosslinker disodium is a protein cross-linker containing a disulfide bond. DTSSP Crosslinker disodium can react with sidechains of amino acids that are within close proximity[1][2].
[1]. Swaim CL, Smith JB, Smith DL. Unexpected products from the reaction of the synthetic cross-linker 3,3'-dithiobis(sulfosuccinimidyl propionate), DTSSP with peptides. J Am Soc Mass Spectrom. 2004;15(5):736-749.
[2]. Anabuki T, et al. Identification of recombinant AtPYL2, an abscisic acid receptor, in E. coli using a substrate-derived bioactive small molecule, a biotin linker with alkyne and amino groups, and a protein cross-linker. Bioorg Med Chem Lett. 2019;29(21):1