Figure 9From: Roles of quaternary structure and cysteine residues in the activity of human serine racemaseThe role of free sulfhydryls in activity of SR dimers. Dimeric fractions of recombinant SR were eluted from a Superdex 200 column with or without DTT (0.2 mM) in the mobile phase. SR activity was then assayed. The -DTT fraction was assayed with or without DTT (0.2 mM) or cystamine (1 mM) in the reaction buffer. (**p < 0.0001).Back to article page