4ABH

Fragments bound to bovine trypsin for the SAMPL challenge

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1K1M	PDB ENTRY 1K1M

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.8		22.5% PEG 3350, 0.18 M AMMONIUM SULFATE, 0.12 M SODIUM THIOCYANATE, 0.09 M BIS-TRIS PH 5.5, 0.01 M TRIS PH 8.5 (FINAL MEASURED PH=5.82). THE PROTEIN WAS AT 2 MM (47 MG/ML), WITH 4 MM BENZYLAMINE AND 10 MM CALCIUM CHLORIDE ADDED TO STABILIZE IT. THE CRYSTALLIZATIONS WERE SET UP WITH A PHOENITO PROTOCOL (NEWMAN ET AL. 2008), WHERE A PHOENIX ROBOT (ART ROBBINS INSTRUMENTS, SUNNYSIDE, CA) WAS USED TO DISPENSE THE PROTEIN INTO AN SD2 CRYSTALLIZATION PLATE (PRE-FILLED WITH 50 ML RESERVOIR SOLUTION) AND A MOSQUITO ROBOT (TTP LABTECH, MELBOURN, UK) WAS USED TO DISPENSE THE RESERVOIR SOLUTION AND SEED STOCK OVER THE PROTEIN DROPLET.

Crystal Properties
Matthews coefficient	Solvent content
1.92	36.1

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 54.641	α = 90
b = 58.811	β = 90
c = 66.494	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	100	CCD	ADSC QUANTUM 210r		2009-01-21	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	AUSTRALIAN SYNCHROTRON BEAMLINE MX1		Australian Synchrotron	MX1

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	1.25	44.1	96.6	0.1	15.5	7.3		57801		1

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	1.25	1.32	94.5		0.27	8.4	7.3

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	PDB ENTRY 1K1M	1.25	66.49	54790	2932	96.26	0.14595	0.14496	0.1644	RANDOM	6.438

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]
0.02			0.01		-0.03

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	40.081
r_dihedral_angle_4_deg	21.472
r_dihedral_angle_3_deg	12.064
r_dihedral_angle_1_deg	7.092
r_angle_refined_deg	2.527
r_chiral_restr	0.412
r_bond_refined_d	0.026
r_gen_planes_refined	0.015
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
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_mcbond_it
r_mcbond_other
r_mcangle_it
r_mcangle_other
r_scbond_it
r_scbond_other
r_scangle_it
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	1629
Nucleic Acid Atoms
Solvent Atoms	395
Heterogen Atoms	40

Software

Software
Software Name	Purpose
REFMAC	refinement
XDS	data reduction
SCALA	data scaling
PHASER	phasing