Aug 8, 2016

The hidden treasure in your data: Phasing with unexpected weak anomalous scatterers from routine datasets

BioRxiv : the Preprint Server for Biology
Raghurama P HegdeUdupi A Ramagopal

Abstract

Single wavelength anomalous dispersion (SAD) utilizing anomalous signal from native sulfurs, or other atoms with Z≤20, generally requires highly redundant data collected with relatively long wavelength X-rays. Here we present experiences with two proteins, where anomalous signal from serendipitously acquired surface bound calcium atoms with data redundancy as low as 10 was utilized to drive de novo structure determination. In both the cases, the calcium atoms were acquired from the crystallization solution, and data collection strategy was not optimized for exploiting the anomalous signal from these scatterers. The X-ray data were collected at 0.98 Å in one case and at 1.74 Å in the other (wavelength optimized for sulfur but anomalous signal from Ca was exploited for structure solution). Similarly, using a test case, we show that the data collected at ~1.0 Å wavelength, where the f″ value for sulfur is 0.28e, is sufficient for structure determination using intrinsic sulfur atoms from a strongly diffracting crystal. Interestingly, it was also observed that SHELXD was capable of generating a substructure solution from high-exposure data with a completeness of 70% for low-resolution reflections extending to 3.5 Å, with relatively ...Continue Reading

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Mentioned in this Paper

Manganese
Calcium [EPC]
Crystal - Body Material
Scattered
Calcium
Plain X-ray
Determination Aspects
Sulfur
Calcium ion
Experience

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