1GUJ

Insulin at pH 2: structural analysis of the conditions promoting insulin fibre formation.

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	4INS

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	2.1		HANGING DROP VAPOUR DIFFUSION METHOD PROTEIN SOL: 5 MG/ML HUMAN INSULIN IN SULPHURIC ACID PH 2.1 RESERVOIR SOL: SULPHURIC ACID PH 2.1,0.025 M SODIUM SULPHATE

Crystal Properties
Matthews coefficient	Solvent content
2.2	45

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 44.046	α = 90
b = 46.177	β = 90
c = 51.194	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	120	CCD	MARRESEARCH	MIRRORS		M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-1		ESRF	ID14-1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	1.63	20	100	0.04	36	5		13079

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	1.63	1.66	100		0.245	9	5

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	MOLECULAR REPLACEMENT	THROUGHOUT	4INS	1.62	34.3	13079	689	99.2	0.172	0.17	0.207	RANDOM	19.74

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]
0.27			0.4		-0.67

RMS Deviations
Key	Refinement Restraint Deviation
r_scangle_it	4.242
r_scbond_it	2.81
r_mcangle_it	2.002
r_angle_other_deg	1.659
r_mcbond_it	1.232
r_symmetry_hbond_refined	0.244
r_nbd_refined	0.211
r_xyhbond_nbd_refined	0.2
r_symmetry_vdw_refined	0.196
r_chiral_restr	0.114
r_bond_refined_d	0.013
r_gen_planes_refined	0.006
r_bond_other_d
r_angle_refined_deg
r_dihedral_angle_1_deg
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_gen_planes_other
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	810
Nucleic Acid Atoms
Solvent Atoms	127
Heterogen Atoms	10

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing