Structural and Functional Analysis of the Complex between Citrate and the Zinc Peptidase Carboxypeptidase A

Table 2

Geometric details of the interaction between protein residues and the citrate ligand.

Protein residue ID	Ligand atoms		Distance (Å)
	Protein	Citrate
Zn	Zn^2+	O2	2.1
		O1	2.7
His69	Nδ1	O2	3.0
Glu72	Oε2	O2	3.2
	Oε2	O1	3.3
Arg127	Nη1	O2	3.2
	Nη2	O5	3.0
Asn144	Nδ2	O6	2.9
Arg145	Nη1	O5	3.2
	Nη1	O6	2.8
	Nη2	O5	2.7
Ser197	O	O1	3.1
Tyr248	Oη	O5	2.6
Glu270	Oε1	O1	2.4
	Oε2	O1	3.0
	Oε2	O7	2.8
HOH213	O	O4	2.6
	O	O3	3.3
HOH109	O	O3	2.6
HOH191	O	O1	2.9