Table 1.

Summary of native MS characterization of KaiC and KaiA–KaiC complex formed in the presence of AMPPNP.

Figure number	Ion series	Assignment			Theoretical mass (D)	Experimental mass (D)	Δm (D)^a	Relative quantity (%)
Figure number	Ion series	Protein complex	AMPPNP number	Mg²⁺ number	Theoretical mass (D)	Experimental mass (D)	Δm (D)^a	Relative quantity (%)
Fig 1A	Blue	KaiC_AA6	12	12	353,850	353,857 ± 10	−7	—
Fig 1C	Blue	KaiC_AA6	12	12	353,850	353,855 ± 9	−5	—
Fig 1C	Red	KaiC_AA6/KaiA₂	11	12	418,838	418,896 ± 27	−58	53^b
Fig 1C	Orange	KaiC_AA6/KaiA₂	10	12	418,332	418,412 ± 28	−80	47^b
Fig S2A	Blue	KaiC_DD6	12	12	354,396	354,375 ± 12	21	—
Fig S2C	Blue	KaiC_DD6	12	12	354,396	354,447 ± 16	−51	—
Fig S2C	Red	KaiC_DD6/KaiA₂	12	12	419,890	420,076 ± 47	−186	—

↵a Δm is the mass difference between the experimental mass and the theoretical mass.
↵b Relative quantity of two ion series are shown.