Table 1.

Kinetic Constants of Various TRs for the Reduction of Thioredoxin.

Enzyme-tetrapeptide	Substrate	kcat (min−1)	Km (μM)	kcat/Km (min−1•M−1)
rTR-GCUGa	H. sapiens Trx	2500	3.3	7.6 ×108
rTR-GCCGa	H. sapiens Trx	14.3	0.4	3.6 ×107
mTR-GCUGb	E. coli Trx	2220	70	3.3 ×107
mTR-GCCGb	E. coli Trx	4.1	49	8.4 ×104
CeTR2-GCCGc	E. coli Trx	610	610	1 ×106
DmTR-SCCSd	D. m. Trx	1320	7.1	1.9 ×108
DmTR-SCCSb	E. coli Trx	300	170	1.7 ×106
AgTR-TCCSe	A. g. Trx	924	8.5	1.13 ×108

^aTaken from (8).

^bTaken from (10).

^cTaken from (11).

^dTaken from (9).

^eTaken from (12).