TABLE 1.

Stoichiometry of Ctr1_1-14 complexes with Cu(II) and Ag(I) ions observed by ESI-MS.

Ions	Experimental m/z a	Calculated m/z a	ΔDa	Error (ppm)
apoCtr11-14
[Ctr11-14 + 2H ]2+	833.3012	833.2998	0.0014	2
[Ctr11-14 + 3H ]3+	555.8680	555.8692	−0.0012	−2
Ctr11-14-Cu(II)
[Ctr11-14 + Cu(II)]2+	864.7583	864.7618	−0.0035	−4
[Ctr11-14 + Cu(II) + H]3+	576.8399	576.8438	−0.0039	−7
Ctr11-14-2Cu(II)
[Ctr11-14 + 2Cu(II) − 2H]2+	895.2160	895.2238	−0.0078	−9
[Ctr11-14 + 2Cu(II) − H]3+	597.1451	597.1518	−0.0067	−11
Ctr11-14-Ag(I)
[Ctr11-14 + Ag(I) + H]2+	887.2496	887.2485	0.0011	1
[Ctr11-14 + Ag(I) + 2H]3+	591.8346	591.8349	−0.0003	−1
Ctr11-14-2Ag(I)
[Ctr11-14 + 2Ag(I)]2+	940.1882	940.1971	-0.0089	−9
[Ctr11-14 + 2Ag(I) + H]3+	627.1270	627.1340	−0.0070	−11
Ctr11-14-Ag(I),Cu(II)
[Ctr11-14 + Ag(I)+ Cu(II)−H]2+	917.6949	917.7104	−0.0155	−17
[Ctr11-14 + Ag(I)+ Cu(II)]3+	612.1314	612.1429	−0.0115	−19

^aThe reported m/z ratios are referred to the prevailing isotopologue in the isotope pattern.