Table I.

X-ray Diffraction Data Collection and Refinement Statistics for apo-CAT_I and CAT_I-CAM Structures

	Apo-CATI	CATI-CAM
Data collection
Space group	P21	P1
Number of trimers per asymmetric unit	3	6
Unit cell dimensions
a, b, c (Å)	115.2, 102.7, 114.1	107.5, 114.5, 114.5
α, β, γ (°)	90, 119.9, 90	119.9, 97.8, 98.7
Resolution (Å)	50.0–3.2 (3.3–3.2)a	50.0–2.9 (3.0–2.9)a
I/σ	9.3 (2.1)	14.3 (2.3)
Completeness (%)	98.4 (86.1)	87.3 (85.0)
Redundancy	4.3 (3.5)	1.7 (1.7)
Rmerge	0.15 (0.476)	0.06 (0.38)
Number of unique reflections	35,818	82,522
Structure refinement statistics
Resolution (Å)	40.0–3.2	35.0–2.9
R (%)	23.8	24.0
Rfree (%)	30.1	30.9
Bond length deviation (RMSD) from ideal (Å)	0.009	0.006
Bond angle deviation (RMSD) from ideal (°)	1.08	0.907
Ramachadran plot statisticsb
% of residues in most allowed regions	84.9	88.7
% of residues in additional allowed regions	12.9	10.5
% of residues in generously allowed regions	2.3	0.8
% of residues in disallowed regions	0 (0 residues)	0 (0 residues)

^aNumbers in parentheses indicate the values in the highest-resolution shell.

^bIndicates Procheck statistics.³⁶