Table 1.

Rate Constants for TG2 Oxidation by Cystamine, Cystine, and GSSG^a

oxidant	kinh/Ki (mM−1 min−1)	Ki (mM)
cystineb	0.29	NDd
GSSGb	0.0033	NDd
cystamineb	1.2	>0.6
cystaminec	1.7	>0.1

^aMeasured in 50 mM Tris and 1 mM EDTA at pH 7.6 and 22 °C.

^bDetermined in a deamidation activity assay.

^cDetermined in a transamidation activity assay.

^dNot determined.