Table 4. Residues surrounding Antimycin at the Q_i site.

For each contact closer than 4 Å is given the residue type, number, and atom; the atom of antimycin, and the contact distance in each monomer. For distances greater than 3 Å, only the closest contact of each protein residue is given. Except for waters, all the residues contacting antimycin belong to cyt b (chains C and P). The “water” modeled between His201 and antimycin O3 does not account for the density as currently modeled (Figure 6).

Helix A and Waters (W)				Helix D & E				Heme bH
		distance(Å)				distance(Å)					distance(Å)
protein atom	Anti atom	C	P	protein atom	Anti atom	C	P	Heme atom		Anti atom	C	P
ALA17 O	C10	3.6	3.7					HEM502	CMA	N2	3.8	3.8
ILE27 CD1	O2	3.5	3.5	MET190 CG	C23	4.0	3.7	HEM502	CMA	C9	3.8	3.7
TRP31 O	N1	3.4	3.4	MET194 CG	O9	3.6	3.5	HEM502	CMA	O4	3.2	3.2
ASN32 OD1	C8	3.9	3.9	LEU197 CD1	O4	3.2	3.1	HEM502	CMA	C20	3.3	3.3
GLY34 O	C27	3.9	4.0	SER205 OG	C4	3.5	3.5	HEM502	CMA	O7	3.7	3.7
SER35 CA	O7	3.0	3.1					HEM502	CMA	C27	3.9	3.9
GLY38 CA	C27	3.8	3.8	PHE220 CE1	C1	3.3	3.4	HEM502	CAA	C5	3.8	3.9
LEU41 CD2	C25	3.9	3.7	TYR224 CD1	O2	3.3	3.3	HEM502	CAA	C6	3.8	3.9
				ASP228 OD1**	N1	2.8	2.8	HEM502	CAA	C7	3.9	4.0
W3 O **	O1	2.9	2.8	ASP228 OD2**	O1	2.6	2.6	HEM502	CBA	C1	3.8	3.8
W1 O **	O2	2.6	2.6					HEM502	CBA	C5	3.7	3.8
“W” O	O3	2.6	2.8					HEM502	CBA	C6	3.6	3.6
W1203 O	C5	---	3.7