Table 2.

Values of the rate constants, their confidence intervals, and associated extinction changes obtained from global fitting of the data in Figures 1A and 5 and the Mössbauer time course from reference (15), all at 5 °C.

Rate Constant	Best-fit value	Lower Bound	Upper Bound	Δε246 (mM−1cm−1)	Δε318 (mM−1cm−1)
k1	300 mM−1s−1 a	-	-	-	-
k−1	50 s−1 a	-	-	-	-
k2	12.7 s−1	9.3 s−1	17.7 s−1	+ 2.0	− 0.4
k3	22.5 s−1	14.4 s−1	44.0 s−1	-	-
k4	0.86 s−1	0.54 s−1	1.55 s−1	+ 8.0	− 0.7
k5	0.024 s−1 b	-	-	− 6.0	+ 1.5

^aTaken from reference (16) and kept fixed.

^bDetermined from the stopped-flow data alone and kept fixed.