5E5F

X-ray structure of the complex between RNase A and compound 4-PF6 ([(PPh3)Au(mi-pbi)Pt(Me)(DMSO)][PF6]), the heterobimetallic derivative obtained in the reaction between the organometallic compound [Pt(pbi)(Me)(DMSO)], pbi=2-(2'-pyridil)benzimidazole (compound 3) and the gold(I) compound [Au(Ph3P)][PF6]

X-RAY DIFFRACTION

---

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP		298	RNase A crystals were obtained using the procedure previously described by Vitagliano et al., 200028. Briefly, crystals of the protein were grown by hanging drop vapor diffusion method using a reservoir solution containing 22-24 % (w/v) PEG4K, 10 mM sodium citrate pH 5.1-5.3. The crystals are monoclinic, space group C2, with two molecules in the asymmetric unit. The adducts were prepared by a three-days soaking in a solution that comprised the standard mother liquor used for the crystal growth to which a 2.5-5 mM solution of each compound was added. Crystal soaked in this solution were mounted for the X-ray data collection without using a cryoprotectant, as done in previous studies30.

Crystal Properties
Matthews coefficient	Solvent content
1.95	37.06

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 99.487	α = 90
b = 31.215	β = 90.69
c = 69.012	γ = 90

Symmetry
Space Group	C 1 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	RIGAKU SATURN 944+		2015-03-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007 HF	1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.68	69	95	6.5	2.4		23228

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.68	1.71	88.5		0.294	2	1.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION		THROUGHOUT	1.68	69	22040	1188	94.71	0.18601	0.18332	0.23404	RANDOM	30.167

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
-0.01		-0.17	0.33		-0.31

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.93
r_dihedral_angle_4_deg	13.81
r_dihedral_angle_3_deg	13.134
r_dihedral_angle_1_deg	6.848
r_long_range_B_other	6.562
r_long_range_B_refined	6.544
r_scangle_other	4.784
r_mcangle_it	3.354
r_mcangle_other	3.353
r_scbond_it	3.28
r_scbond_other	3.279
r_mcbond_it	2.526
r_mcbond_other	2.515
r_angle_refined_deg	1.873
r_angle_other_deg	0.883
r_chiral_restr	0.104
r_bond_refined_d	0.018
r_gen_planes_refined	0.01
r_bond_other_d	0.002
r_gen_planes_other	0.001
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1898
Nucleic Acid Atoms
Solvent Atoms	186
Heterogen Atoms	10

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing