Table 3. Data collection and processing.

Values in parentheses are for the highest resolution shell.

	pH 5.0	pH 5.2	pH 5.6	pH 7.5
PDB code	7e6l	7e6n	7e6r	7e6m
Diffraction source	BL17U1, SSRF	BL17U1, SSRF	BL17U1, SSRF	BL17U1, SSRF
Wavelength (Å)	0.97918	0.97918	0.97918	0.97918
Temperature (K)	100	100	100	100
Space group	P1211	P1211	P1211	P1211
a, b, c (Å)	63.07, 82.40, 63.92	63.37, 83.21, 64.00	63.15, 82.91, 63.84	62.58, 80.70, 63.31
α, β, γ (°)	90, 108.47, 90	90, 108.64, 90	90, 108.70, 90	90, 108.26, 90
Total reflections	373806	312372	285265	315996
Unique reflections	59245	54115	49375	52288
Resolution (Å)	1.78 (1.83–1.78)	1.84 (1.89–1.84)	1.90 (1.94–1.90)	1.83 (1.88–1.83)
Rmerge (%)	4.6 (17.3)	4.6 (16.2)	7.5 (39.8)	6.0 (28.5)
〈I/σ(I)〉	19.9 (2.1)	20.2 (2.0)	16.5 (2.2)	18.5 (2.4)
Completeness (%)	99.7 (98.6)	99.2 (93.8)	99.6 (97.8)	99.9 (99.9)
Multiplicity	6.3 (6.2)	5.8 (4.4)	5.8 (4.3)	6.0 (6.7)