Table 3.

Hydrogen bonds at the copper and zinc sites (Å)

Monomer	W	X	Y	Z
Zn-H46R
Asp 124Oδ2 Arg 46 Nɛ2	3.1	3.4	3.4	3.9
His 120 Nɛ2-His 48 Nɛ2	3.0	2.9	3.0	3.0

Monomer	G	H	I	J	K	L	M	N
a Bidentate interaction with Asp 83 Oδ1 and Oδ2.
Apo-H46R
Copper site
His 48Nɛ2-His 120Nɛ2	3.0	3.1	3.1	3.1	3.1	3.0	3.1	3.1
Arg 46Nη1-His 120 Nɛ	3.5	3.3	3.2	3.2	3.3	3.4		—
Arg 46Nη2-Gly 138O						3.1
Arg 46Nη2-Thr 137O								2.7
Arg 46Nη2-His 63 Nɛ2					3.1
Arg 46Nɛ-His 63 Nɛ2					3.2
Zinc site
His 63Nɛ2-His 80Nɛ2	2.7	2.9		3.0		2.5
His 80Nδ1-His 63Nδ1							3.2	2.6
His 80Nɛ2-Arg 69O							2.8	3.4
His 63Nδ1-Asp 83Oδ1				3.0
Involving Asp124
Asp 124-Arg 46Nη2	2.7	2.9	2.9	3.1	3.4	3.0		2.9
Asp 124-Arg 46Nɛ							3.2
Asp 124Oδ1-His 71							2.8
Asp 124Oδ2-Asp 83							2.9	2.9/3.0a