TABLE 1.

Chemical shifts of heme methyl signals of S. oneidensis small tetraheme cytochrome c in five macroscopic oxidation states at a pD of 9.0 and 303 K

Group and signala	Chemical shift (ppm) of signal in oxidation stateb
	S0	S1	S2	S3	S4
Group 1
A	38.50	22.20	18.10	7.40	1.60
H	19.30	11.00	10.20
I	17.00	10.50	8.60
Group 2
C	30.00	19.60	5.90	3.70
D	26.90	18.50	5.85	4.15
Group 3
F	22.40	18.30	12.35	7.05	0.95
G	21.30	19.00	18.15	9.30
J	14.30	12.40	8.80	6.80
K	13.25	11.40	7.95	5.90	2.70
Group 4
B	35.30	34.90	32.80	19.60	3.25
E	23.00	22.50	20.80	13.40

^aThe signal labels are given in Fig. 5. 

^bChemical shifts of heme methyl signals of S. oneidensis small tetraheme cytochrome c in five oxidation states. S₀, S₁, S₂, S₃, and S₄ stand for the fully oxidized, one-electron reduced, two-electron reduced, three-electron reduced, and fully reduced states, respectively.