Id	Element	Ion	Binding family	Amino acids or nucleotide residues names	All bound residues	Is homomer	Number of bound amino acids or nucleotide residues	Number of all bound residues	Number of coordinating chains	Representative
4RVO-K-2	K	K⁺	G2K2	GLY.LYS.	GLY.LYS.	✔	4	4	2	✘
3MBJ-ZN-1	ZN	Zn²⁺	H2	HIS.	HIS.	✔	2	2	2	✔
3MBJ-ZN-2	ZN	Zn²⁺	D2	ASP.	ASP.	✔	2	2	2	✔
3MBJ-ZN-3	ZN	Zn²⁺	D2	ASP.	ASP.	✔	2	2	2	✘
3MBJ-ZN-4	ZN	Zn²⁺	D2	ASP.	ASP.	✔	2	2	2	✘
3MI9-ZN-1	ZN	Zn²⁺	C4	CYS.	CYS.	✘	4	4	2	✔
3N2R-ZN-1	ZN	Zn²⁺	C4	CYS.	CYS.	✔	4	4	2	✘
3LUM-CA-1	CA	Ca²⁺	D2	ASP.	ASP.HOH.	✔	2	6	2	✘
3LUN-CA-1	CA	Ca²⁺	D2	ASP.	ASP.HOH.	✔	2	6	2	✘
3LUO-ZN-1	ZN	Zn²⁺	A1E1	ALA.GLU.	ALA.GLU.	✔	2	2	2	✔
3LUO-ZN-2	ZN	Zn²⁺	A1E1	ALA.GLU.	ALA.GLU.	✔	2	2	2	✘
3LUO-ZN-3	ZN	Zn²⁺	A1E1	ALA.GLU.	ALA.GLU.	✔	2	2	2	✘
3M7P-ZN-1	ZN	Zn²⁺	H2	HIS.	ASP.HOH.	✔	2	2	2	✔
3M7P-ZN-2	ZN	Zn²⁺	H2	HIS.	ASP.HOH.	✔	2	2	2	✔
3LVE-ZN-1	ZN	Zn²⁺	D1E1	ASP.GLU.	ASP.GLU.HOH.	✔	2	5	2	✔
3LVE-ZN-2	ZN	Zn²⁺	D1E1	ASP.GLU.	ASP.GLU.HOH.	✔	2	5	2	✘
3LZN-ZN-1	ZN	Zn²⁺	H3	HIS.	HIS.	✔	3	3	2	✔
3LZN-ZN-2	ZN	Zn²⁺	H3	HIS.	HIS.	✔	3	3	2	✔
3HYP-ZN-1	ZN	Zn²⁺	D1E2	ASP.GLU.	ASP.GLU.	✔	3	3	2	✘
3HYP-ZN-2	ZN	Zn²⁺	D1E1	ASP.GLU.	ASP.GLU.	✔	2	2	2	✘