Likelihood weighting of partial structure factors using spline coefficients

被引:5
作者
Cowtan, K [1 ]
机构
[1] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England
关键词
D O I
10.1107/S0021889804031474
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A method for the weighting of structure factors from an incomplete and inaccurate model is described which relies on the fitting of smooth spline functions of resolution. The use of smooth spline functions avoids the problems of discontinuities introduced when performing calculations in resolution shells. The complexity of the functions to be fit may be varied by changing the number of spline parameters. This approach is used to investigate the stability of the problem when data are limited.
引用
收藏
页码:193 / 198
页数:6
相关论文
共 18 条
[1]   Bias reduction in phase refinement by modified interference functions: Introducing the gamma correction [J].
Abrahams, JP .
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY, 1997, 53 :371-376
[2]   THE CCP4 SUITE - PROGRAMS FOR PROTEIN CRYSTALLOGRAPHY [J].
BAILEY, S .
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY, 1994, 50 :760-763
[3]   The Protein Data Bank [J].
Berman, HM ;
Westbrook, J ;
Feng, Z ;
Gilliland, G ;
Bhat, TN ;
Weissig, H ;
Shindyalov, IN ;
Bourne, PE .
NUCLEIC ACIDS RESEARCH, 2000, 28 (01) :235-242
[4]   ASSESSMENT OF PHASE ACCURACY BY CROSS VALIDATION - THE FREE R-VALUE - METHODS AND APPLICATIONS [J].
BRUNGER, AT .
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY, 1993, 49 :24-36
[5]   Generic representation and evaluation of properties as a function of position in reciprocal space [J].
Cowtan, K .
JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2002, 35 :655-663
[6]   Can anomalous signal of sulfur become a tool for solving protein crystal structures? [J].
Dauter, Z ;
Dauter, M ;
de La Fortelle, E ;
Bricogne, G ;
Sheldrick, GM .
JOURNAL OF MOLECULAR BIOLOGY, 1999, 289 (01) :83-92
[7]   Secondary-structure matching (SSM), a new tool for fast protein structure alignment in three dimensions [J].
Krissinel, E ;
Henrick, K .
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY, 2004, 60 :2256-2268
[8]  
LESCAR J, 1994, PROTEIN SCI, V3, P788
[9]   Likelihood-based refinement. I. Irremovable model errors [J].
Lunin, VY ;
Afonine, PV ;
Urzhumtsev, AG .
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 2002, 58 :270-282
[10]   Refinement of macromolecular structures by the maximum-likelihood method [J].
Murshudov, GN ;
Vagin, AA ;
Dodson, EJ .
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY, 1997, 53 :240-255