Table S1.

Summary of crystallographic information

Structure	IntS9–IntS11 CTD complex
Data collection
Space group	P21
Cell dimensions
a, b, c, Å	63.0, 67.8, 98.6
α, β, γ, degrees	90, 100.6, 90
Resolution, Å	25–2.1 (2.2–2.1)
Rmerge, %	7.8 (42.4)
CC1/2	(0.898)
I/σI	20.5 (3.5)
No. reflections	51,362 (5,038)
Completeness	99.6 (96.8)
Redundancy	6.8 (5.4)
Refinement
Resolution, Å	25–2.1 (2.15–2.1)
No. reflections	47,760 (3,362)
Rwork/Rfree, %	16.7 (21.5)/22.0 (29.7)
No. atoms
Protein	5,636
Water	419
B-factors
Protein	38.3
Water	39.2
Rmsd
Bond lengths, Å	0.012
Bond angles, degrees	1.3

The numbers in parentheses are for the highest resolution shell.