1P6W

Crystal structure of barley alpha-amylase isozyme 1 (AMY1) in complex with the substrate analogue, methyl 4I,4II,4III-tri-thiomaltotetraoside (thio-DP4)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1HT6	PDB ENTRY 1HT6

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.7	290	PEG 8000, ISOPROPANOL, pH 6.7, VAPOR DIFFUSION, HANGING DROP, temperature 290K

Crystal Properties
Matthews coefficient	Solvent content
2.3	46.42

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 93.43	α = 90
b = 72.1	β = 90
c = 60.88	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MARRESEARCH	Osmic mirrors	2000-10-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ENRAF-NONIUS	1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	46.6	96.7	0.124	5.7	3	27556	27556			12.01

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2	2.11	96.7		0.476	1.6

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1HT6	2	46.52	27360	27360	2733	96	0.17	0.17	0.216	RANDOM	12.9

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]
-1.46			0.62		0.84

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	23
c_scangle_it	2.17
c_scbond_it	1.52
c_angle_deg	1.3
c_mcangle_it	1.25
c_mcbond_it	0.89
c_improper_angle_d	0.8
c_bond_d	0.012

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3140
Nucleic Acid Atoms
Solvent Atoms	641
Heterogen Atoms	96

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
CCP4	data scaling
AMoRE	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.