Phasing took place with two derivatives by MIRAS using SOLVE in the resolution range 3.50–20.00 Å. All data sets were collected on SLS beamline PXII and were combined with CAD and scaled with SCALEIT prior to use in SOLVE.

Phasing set	Native	TAMM	CsCl
Radiation source	SLS PXII	SLS PXII	SLS PXII
Preparation	—	24 h soak, 10 mM in cryosolution	20 min soak, 200 mM in cryosolution
Heavy-atom location method	—	INANO, ANOREFINE	INANO, NOANOREFINE
Phasing power (acentric/centric)	—	1.48/1.11	0.73/0.56
Figure of merit (all data)	—	0.29	0.29