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Titolo:
Map self-validation: a useful discriminator of phase correctness at low resolution
Autore:
Langs, DA; Blessing, RH; Guo, DY;
Indirizzi:
Hauptman Woodward Med Res Inst Inc, Buffalo, NY 14203 USA Hauptman Woodward Med Res Inst Inc Buffalo NY USA 14203 alo, NY 14203 USA
Titolo Testata:
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
, volume: 57, anno: 2001,
parte:, 4
pagine: 574 - 578
SICI:
0907-4449(200104)57:<574:MSAUDO>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
VERY-LOW RESOLUTION; MACROMOLECULAR CRYSTALLOGRAPHY; COMBINED MAXIMIZATION; MULTISOLUTION METHOD; PROTEIN; LIKELIHOOD; ELECTRON; INFORMATION; REFINEMENT; ENTROPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Langs, DA Hauptman Woodward Med Res Inst Inc, 73 High St, Buffalo, NY 14203 USA Hauptman Woodward Med Res Inst Inc 73 High St Buffalo NY USA 14203
Citazione:
D.A. Langs et al., "Map self-validation: a useful discriminator of phase correctness at low resolution", ACT CRYST D, 57, 2001, pp. 574-578

Abstract

A new map-validation procedure is based on the correlation-coefficient agreement between the observed structure-factor magnitudes and their extrapolated values from suitably modified electron-density maps from which they have been each in turn systematically excluded. The correlation coefficient tends to a maximum as the phase errors in a map are reduced. This principle was used to resolve the single-wavelength anomalous scattering (SAS) and single-derivative isomorphous replacement (SIR) phase ambiguity for a number of error-free trial structures. Applications employing real data sets tend to be more difficult owing to data incompleteness and errors affecting the construction of the Argand diagram.

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Documento generato il 01/04/20 alle ore 10:32:06