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Title: Pushing the limits of sulfur SAD phasing: de novo structure solution of the N-terminal domain of the ectodomain of HCV E1

The sulfur SAD phasing method was successfully used to determine the structure of the N-terminal domain of HCV E1 from low-resolution diffracting crystals by combining data from 32 crystals. Single-wavelength anomalous dispersion of S atoms (S-SAD) is an elegant phasing method to determine crystal structures that does not require heavy-atom incorporation or selenomethionine derivatization. Nevertheless, this technique has been limited by the paucity of the signal at the usual X-ray wavelengths, requiring very accurate measurement of the anomalous differences. Here, the data collection and structure solution of the N-terminal domain of the ectodomain of HCV E1 from crystals that diffracted very weakly is reported. By combining the data from 32 crystals, it was possible to solve the sulfur substructure and calculate initial maps at 7 Å resolution, and after density modication and phase extension using a higher resolution native data set to 3.5 Å resolution model building was achievable.
Authors:
; ;  [1] ; ;  [2] ;  [1] ; ;  [1] ;  [3]
  1. University of Oxford, Oxford OX3 7BN (United Kingdom)
  2. Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot OX11 0DE (United Kingdom)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
22347743
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Crystallographica. Section D: Biological Crystallography; Journal Volume: 70; Journal Issue: Pt 8; Other Information: PMCID: PMC4118829; PMID: 25084338; PUBLISHER-ID: mn5063; OAI: oai:pubmedcentral.nih.gov:4118829; Copyright (c) El Omari et al. 2014; This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
Denmark
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMS; CRYSTAL STRUCTURE; CRYSTALS; DENSITY; DERIVATIZATION; MATHEMATICAL SOLUTIONS; RESOLUTION; SIGNALS; SOLUTIONS; SULFUR; WAVELENGTHS