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
2BJ7-NI-2	NI	Ni²⁺	D2	ASP.	ASP.	✔	2	2	2	✘
2BJ7-NI-3	NI	Ni²⁺	D2	ASP.	ASP.HOH.	✔	2	4	2	✘
2BJ7-NI-4	NI	Ni²⁺	D2	ASP.	ASP.HOH.	✔	2	4	2	✘
1XU2-NI-1	NI	Ni²⁺	H3	HIS.	HIS.	✔	3	3	3	✔
5Y9R-CD-1	CD	Cd²⁺	D1E1	ASP.GLU.	ASP.GLU.HOH.	✔	2	3	2	✔
5XGF-NI-1	NI	Ni²⁺	D1G1	ASP.GLY.	ASP.GLY.HOH.	✔	2	5	2	✔
5XGF-NI-2	NI	Ni²⁺	D1G1	ASP.GLY.	ASP.GLY.HOH.	✔	2	5	2	✘
5XKT-NI-1	NI	Ni²⁺	C2	CYS.	CYS.	✔	2	2	2	✔
6CT8-NI-1	NI	Ni²⁺	H6	HIS.	HIS.	✔	6	6	3	✔
6DK8-NI-1	NI	Ni²⁺	H2	HIS.	HIS.	✔	2	2	2	✘
6DK8-NI-2	NI	Ni²⁺	H2	HIS.	HIS.	✔	2	2	2	✔
6F5N-NI-1	NI	Ni²⁺	E2	GLU.	GLU.HOH.	✔	2	4	2	✔
6BN1-NI-1	NI	Ni²⁺	D1L1	ASP.LEU.	ASP.LEU.	✘	2	2	2	✔
6BN1-NI-2	NI	Ni²⁺	D1L1	ASP.LEU.	ASP.LEU.	✘	2	2	2	✘
4RLE-NI-1	NI	Ni²⁺	H6	HIS.	HIS.	✔	6	6	3	✔
5FSH-NI-1	NI	Ni²⁺	N2	ASN.	ASN.	✔	2	2	2	✔
5FSH-NI-2	NI	Ni²⁺	E2	GLU.	GLU.	✔	2	2	2	✔
4X68-NI-1	NI	Ni²⁺	D2	ASP.	ASP.	✔	2	2	2	✔
5FPX-NI-1	NI	Ni²⁺	G1Q1	GLN.GLY.	GLN.GLY.	✘	2	2	2	✔
5FPX-NI-2	NI	Ni²⁺	G1Q1	GLN.GLY.	GLN.GLY.	✘	2	2	2	✘