Download MendeleyOn the routine use of soft X-rays in macromolecular crystallography. Part III. The optimal data-collection wavelength.
Mueller-Dieckmann, C., Panjikar, S., Tucker, P.A., Weiss, M.S.(2005) Acta Crystallogr D Biol Crystallogr 61: 1263-1272
- PubMed: 16131760
- DOI: https://doi.org/10.1107/S0907444905021475
- PubMed Abstract:
Complete and highly redundant data sets were collected at different wavelengths between 0.80 and 2.65 A for a total of ten different protein and DNA model systems. The magnitude of the anomalous signal-to-noise ratio as assessed by the quotient R(anom)/R(r.i.m.) was found to be influenced by the data-collection wavelength and the nature of the anomalously scattering substructure. By utilizing simple empirical correlations, for instance between the estimated deltaF/F and the expected R(anom) or the data-collection wavelength and the expected R(r.i.m.), the wavelength at which the highest anomalous signal-to-noise ratio can be expected could be estimated even before the experiment. Almost independent of the nature of the anomalously scattering substructure and provided that no elemental X-ray absorption edge is nearby, this optimal wavelength is 2.1 A.
Organizational Affiliation:
EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.
