1UHB

Crystal structure of porcine alpha trypsin bound with auto catalyticaly produced native peptide at 2.15 A resolution

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1QQU	pdb code 1qqu

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.7	293	1.5M ammonium sulphate, pH 6.70, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
1.89	34.3

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.945	α = 90
b = 53.921	β = 90
c = 77.245	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	293	IMAGE PLATE	MARRESEARCH			M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200

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	2.15	76.7		0.14		3.5	11187	9847

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)
	2.15	2.23			0.14		3.5	9847

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	pdb code 1qqu	2.15	19.31	11187	9425	467	88.44	0.193	0.193	0.193	0.22787	RANDOM	17.896

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]
-1.61			0.37		1.24

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	19.016
r_scangle_it	7.358
r_scbond_it	5.242
r_dihedral_angle_1_deg	4.676
r_mcangle_it	3.316
r_angle_refined_deg	2.597
r_mcbond_it	2.137
r_angle_other_deg	1.474
r_xyhbond_nbd_refined	0.747
r_symmetry_vdw_other	0.549
r_symmetry_vdw_refined	0.496
r_nbd_refined	0.391
r_nbd_other	0.256
r_symmetry_hbond_refined	0.234
r_chiral_restr	0.181
r_bond_refined_d	0.04
r_nbtor_other	0.022
r_gen_planes_refined	0.014
r_xyhbond_nbd_other	0.01
r_gen_planes_other	0.008
r_bond_other_d	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1704
Nucleic Acid Atoms
Solvent Atoms	147
Heterogen Atoms	5

Software

Software
Software Name	Purpose
MAR345	data collection
DENZO	data reduction
CNS	refinement
REFMAC	refinement
SCALEPACK	data scaling
CNS	phasing