1BG9

BARLEY ALPHA-AMYLASE WITH SUBSTRATE ANALOGUE ACARBOSE

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6.7		pH 6.7

Crystal Properties
Matthews coefficient	Solvent content
4.67	75

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 135.2	α = 90
b = 135.2	β = 90
c = 79.6	γ = 120

Symmetry
Space Group	P 31 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	288	AREA DETECTOR	SIEMENS		1992-04-19	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	2.729		90.5	0.092	0.092	16.6	2.9		17688		1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2.729	2.9	44.8		0.27	0.27	1.7	1.5

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	REFINEMENT DIFFERENCE FOURIER	THE VERSION OF X-PLOR (2.1) ORIGINALLY USED FOR REFINEMENT THE FREE R TEST WAS NOT AN OPTION. THEREFORE WE HAVE GIVEN THE OVERALL R FACTOR (TEST+WORKING) INSTEAD OF (WORK) TOGETHER WITH AN ESTIMATE OF THE FREE R (TEST) VALUE BASED ON A SIMULATED ANNEALING REFINEMENT WITH A NEWER VERSION OF X-PLOR (3.1).	1AMY	2.8	10	1	17688	1729	86.4	0.151	0.151	0.249	RANDOM	20.1

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	23.6
x_angle_deg	3.2
x_bond_d	1.5
x_improper_angle_d	1.4
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	3184
Nucleic Acid Atoms
Solvent Atoms	148
Heterogen Atoms	58

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
XENGEN	data reduction
NIELSEN	data reduction
XUONG)	data reduction
XENGEN	data scaling
X-PLOR	phasing