TABLE 4.

Intersubunit interactions (d, in Å) in E. coli E3 (averaged between the two subunits)

The ′ indicates residues of the other subunit in the functional dimer.

Residues/atoms	d
	Å
Asp-27(OD2)–Asn-468′(ND2)	2.87
His-58(NE2)–Ser-390′(O)	3.41
His-72(O)–Ile-86′(N)	2.87
Gly-73(O)–Asp-82′(N)	2.75
Val-75(N)–Lys-80′(O)	2.90
Val-75(O)–Lys-80′(N)	3.01
Arg-108(NH1)–Leu-466′(O)	3.32
Arg-108(NH2)–Ile-463′(O)	3.30
Arg-108(NH2)–Leu-466′(O)	2.77
His-322(ND1)–His-445′(N)	3.19
His-329(NE2)– Thr-464′(OG1)	2.84
Tyr-352(OH)–Pro-446′(O)	3.57
Gly- 419(O)–His-449′(ND1)	3.54
Glu-420(OE1)–Leu-448′(N)	3.41
Glu-420(OE1)–His-449′(N)	2.93
Glu-420(OE1)–His-449′(ND1)	2.81
Glu-420(OE2)–Leu-448′(N)	2.80
Gly-423(N)–His-449′(NE2)	3.41
His-445′(O)–FAD-600(O2)	3.24
His-445′(O)–FAD-600(N3)	2.81