SMPEG4

SM(PEG)4 is an amine-to-sulfhydryl crosslinkers with 24.6 angstroms length. It has an amino group-reactive NHS ester and sulfhydryl group-reactive maleimide. The N-hydroxysuccinimide ester (NHS) group reacts specifically and efficiently with lysine and N-terminal amino groups at pH 7-9 to form stable amide bonds. The maleimide group reacts with reduced sulfhydryls at pH 6.5-7.5 to form stable thioether bonds. SM(PEG)4 is used for irreversibly crosslinking proteins or peptides by flexible PEG spacer arms. The PEG arms help maintain conjugate solubility, reducing tendency toward aggregation and immunogenicity. It is ideal for performing controlled, two-step protein conjugations as SMCC.