1A0J

CRYSTAL STRUCTURE OF A NON-PSYCHROPHILIC TRYPSIN FROM A COLD-ADAPTED FISH SPECIES.

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3PTB	PDB ENTRY 3PTB BOVINE TRYPSIN, WITH CORRECT AMINO ACID SEQUENCE SUPERIMPOSED ONTO ANIONIC SALMON TRYPSIN 2TBS.
experimental model	PDB	2TBS	PDB ENTRY 3PTB BOVINE TRYPSIN, WITH CORRECT AMINO ACID SEQUENCE SUPERIMPOSED ONTO ANIONIC SALMON TRYPSIN 2TBS.

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		pH 4.6

Crystal Properties
Matthews coefficient	Solvent content
2.2	44

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 65.907	α = 90
b = 83.107	β = 90
c = 154.787	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	295	IMAGE PLATE	MARRESEARCH		1996-08-19	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE BM1A		ESRF	BM1A

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	1.7	28	81.2	0.123	3.6	5.9		76357		1	19.6

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	1.7	1.79	52.3		0.258	2.9	2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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 3PTB BOVINE TRYPSIN, WITH CORRECT AMINO ACID SEQUENCE SUPERIMPOSED ONTO ANIONIC SALMON TRYPSIN 2TBS.	1.7	8	3	68062	3866	73.061	0.173	0.173	0.215	RANDOM	22.93

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	26.35
x_angle_deg	2.697
x_improper_angle_d	1.087
x_bond_d	0.013
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6640
Nucleic Acid Atoms
Solvent Atoms	379
Heterogen Atoms	87

Software

Software
Software Name	Purpose
DENZO	data reduction
XDS	data scaling
SCALA	data scaling
Agrovata	data reduction
CCP4	data reduction
AMoRE	phasing
X-PLOR	refinement
XDS	data reduction
CCP4	data scaling