BIOINORGANIC CHEMISTRY A Short Course Second Edition

418 IRON-CONTAINING PROTEINS AND ENZYMES

TABLE 7.8 Selected Bonding Distances for Cytochromes c PDB No. Fe (II)/(III) (Species, Crystal Space Group, Resolution Å )

H

O ID 2

(watxxx)

H - Bond Partner — H

O Distance ( Å ) 2

Amino Acid to H - Bond Partner

Distance (

Å )

Iron Ion

— Amino

Acid Ligand

Bond Distance

( Å )

1YCCFe(II)(yeast

iso -

1, P4

(^2 3)
2, 1.23) 1
wat166 wat168
heme O2D (4.09)
a ,
thr78 O
2.72, γ 1
tyr67 OH 2.61, asn52 O
(5.28) δ 1
a
asn52 N
δ^2
3.14
arg38 N
η^1
2.56,
heme O1A 2.84
met80 S
— tyr67 OH 3.25,δ
asn52 O
— heme O2A 3.76,δ 1
asn52 N
δ^2
— heme O2A 3.34
his18met80
N
— Fe 1.99ε 2
Sδ
— Fe 2.35
2YCCFe(III)(yeast
iso -
1, P4
(^2 3)
2, 1.90) 1
wat166 wat168
heme O2D (4.08)
a ,
thr78 O
2.70, γ 1
tyr67 OH 2.63, asn52 O
(6.47) δ 1
a
asn52 N
δ^2
(4.26)
a
arg38 N
η^1
2.72,
heme O1A 2.87
met80 S
— tyr67 OH 3.12,δ
asn52 O
— heme O2A 3.40,δ 1
asn52 N
δ^2
— heme O2A 3.53
his18met80
N
— Fe 2.01ε 2
Sδ
— Fe 2.43
1HRCFe(III)(horse, P4
, 1.90) 3
wat112 wat139
heme O2D (4.62)
a ,
thr78 O
2.72, γ 1
tyr67 OH 2.78, asn52 O
3.24δ 1
arg38 N
η^1
2.84,
heme O1A 3.53
met80 S
— tyr67 OH 3.11,δ
asn52 O
— heme O1D 3.66,δ 1
asn52 N
δ^2
— heme O2A 3.31
his18met80
N
— Fe 2.04ε 2
Sδ
— Fe 2.32