Table 1. Redox potentials and kinetic parameters of various thioredoxins and glutaredoxins ^a .

Redoxin		Redoxpotential		Kinetic parameters with PR
Abbr.	Source	ΔE′0, mV	Ref.	K m, μM	V max, U mg–1	k cat K m –1, %	Ref.
Trx1	E. c.	–270	40	13.7	6.7	100	16
Trx2	E. c.	–221	60	34.2	6.3	38	16
Grx1	E. c.	–233	30	14.9	5.1	70	16
Grx2	E. c.	(n.a.)			No activity		16
Grx3	E. c.	–198	30		No activity		16
Grx4	E. c.	(n.a.)			No activity		p.s.
NrdH	E. c.	–248.5	22		No activity		p.s.
Grx	T4	–240	23		No activity		p.s.
TrxH1	A. t.	(n.a.)		59.0	5.3	18	p.s.
TrxH2	A. t.	(n.a.)		43.1	4.7	23	p.s.
TrxH3	A. t.	(n.a.)		17.8	13.2	154	p.s.
TrxH4	A. t.	(n.a.)		26.1	5.7	45	p.s.
Grx	Poplar	(n.a.)		63.7	10.4	33	25
hTrx1	H. s.	–230	61	68.1	19.6	59	p.s.
hGrx2	H. s.	–221	62		No activity		p.s.

^a A. t.: Arabidopsis thaliana, E. c.: Escherichia coli, H. s.: Homo sapiens, n.a.: not available; p.s.: present study.