Solving proteins at non-atomic resolution by direct methods: Update
| Autor: | Giovanni Luca Cascarano, Giampiero Polidori, Carmelo Giacovazzo, Maria Cristina Burla, Benedetta Carrozzini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Diffraction direct methods protein structure solution non-atomic resolution Computer science Resolution (electron density) Phase (waves) 010403 inorganic & nuclear chemistry 01 natural sciences General Biochemistry Genetics and Molecular Biology non-atomic resolution 0104 chemical sciences direct methods 03 medical and health sciences symbols.namesake protein structure solution 030104 developmental biology Fourier transform Amplitude Direct methods symbols Fraction (mathematics) Structure factor Algorithm |
| Zdroj: | Journal of applied crystallography 50 (2017): 1048–1055. doi:10.1107/S1600576717007300 info:cnr-pdr/source/autori:Burla M.C. 1-2); Carrozzini B. 2); Cascarano G.L. 2); Giacovazzo C. 2); Polidori G. 2)/titolo:Solving proteins at non-atomic resolution by direct methods: Update/doi:10.1107%2FS1600576717007300/rivista:Journal of applied crystallography/anno:2017/pagina_da:1048/pagina_a:1055/intervallo_pagine:1048–1055/volume:50 |
| DOI: | 10.1107/S1600576717007300 |
| Popis: | Direct methods can be used to solve proteins of great structural complexity even when diffraction data are at non-atomic resolution. However, one of the main obstacles to the wider application of direct methods is that they reliably phase only a small fraction of the observed reflections, those with a sufficiently large value of the normalized structure factor amplitude. The subsequent phase expansion and refinement required for full structure solution are difficult. Here a new phase refinement procedure is described, which combines (1–2) difference Fourier synthesis with electron density modification techniques and thevive la differenceand Free Lunch algorithms. This procedure is able to solve data resistant to other direct space refinement procedures. |
| Databáze: | OpenAIRE |
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