Table 1.

Expected and measured masses for all proteins and complexes identified by native MS

Accurate monomer masses
Protein, z+	Sequence mass (Da)	Measured mass (average ± S.D., Da)
QT2–4, 4–7+	8592.37	8645.84 ± 0.05
LC8, 3–7+	10,770.31	10,638.52 ± 0.20
Masses of QT2–4/LC8 species
Species/complex, z+	Expected mass (Da)	Measured mass (average ± S.D., Da)
LC8 monomer, 3–8+	10,638.52 ± 0.20	10,753 ± 2
LC8 dimer, 8–10+	21,277.0 ± 0.4	21,503 ± 1
QT2–4 monomer + 1 LC8 dimer	29,922.9 ± 0.4	30,154.2 ± 0.9
QT2–4 monomer + 2 LC8 dimers	51,200 ± 1	51,765 ± 8
QT2–4 dimer + 3 LC8 dimers	81,123 ± 1	81,925 ± 21
QT2–4 dimer + 4 LC8 dimers	102,400 ± 2	103,497 ± 15