Table 3.

Coordination distances and crystallographic temperature factors of iron-coordinating atoms.

	Crystal structurea		Cryo-EM structure
Atom	Distance (Å)	B factor (Å2)	Distance (Å)
Fe	–	35.53 ± 0.15	–
H86 Nε2	2.17 ± 0.02	23.94 ± 1.14	2.22
H90 Nε2	2.19 ± 0.02	32.78 ± 1.94	2.36
E114 Oε1	2.29 ± 0.02	27.43 ± 1.05	2.44
E114 Oε2	2.18 ± 0.02	25.20 ± 0.91	2.44
Wat1	2.17 ± 0.02	31.71 ± 1.30	2.37
Wat2	2.24 ± 0.02	30.82 ± 2.53	–b

^aAverage and standard deviation of the values of the 8 chains in the asymmetric unit are shown.

^bWat2 was not observed in the cryo-EM structure.