1L74

MULTIPLE STABILIZING ALANINE REPLACEMENTS WITHIN ALPHA-HELIX 126-134 OF T4 LYSOZYME HAVE INDEPENDENT, ADDITIVE EFFECTS ON BOTH STRUCTURE AND STABILITY

X-RAY DIFFRACTION

Crystallization

Crystal Properties
Matthews coefficient	Solvent content
2.84	56.68

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 61.4	α = 90
b = 61.4	β = 90
c = 96.5	γ = 120

Symmetry
Space Group	P 32 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	298	AREA DETECTOR	AREA DETECTOR	Xuong-Hamlin		M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	rotating-anode X-ray tube	RIGAKU RU200

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION		1.7	6			0.16

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
t_angle_deg	1.8
t_bond_d	0.013
t_dihedral_angle_d
t_incorr_chiral_ct
t_pseud_angle
t_trig_c_planes
t_gen_planes
t_it
t_nbd

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1285
Nucleic Acid Atoms
Solvent Atoms	147
Heterogen Atoms	3

Software

Software
Software Name	Purpose
TNT	refinement
Xengen (HOWARD, NIELSEN, XUONG)	data scaling

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.