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J Struct Biol. 2016 Dec;196(3):407-413. doi: 10.1016/j.jsb.2016.09.004. Epub 2016 Sep 10.

Iterative projection algorithms for ab initio phasing in virus crystallography.

Author information

1
Computational Imaging Group, Department of Electrical and Computer Engineering, University of Canterbury, Christchurch, New Zealand.
2
School of Biological Sciences, The University of Auckland, Auckland, New Zealand.
3
Computational Imaging Group, Department of Electrical and Computer Engineering, University of Canterbury, Christchurch, New Zealand. Electronic address: rick.millane@canterbury.ac.nz.

Abstract

Iterative projection algorithms are proposed as a tool for ab initio phasing in virus crystallography. The good global convergence properties of these algorithms, coupled with the spherical shape and high structural redundancy of icosahedral viruses, allows high resolution phases to be determined with no initial phase information. This approach is demonstrated by determining the electron density of a virus crystal with 5-fold non-crystallographic symmetry, starting with only a spherical shell envelope. The electron density obtained is sufficiently accurate for model building. The results indicate that iterative projection algorithms should be routinely applicable in virus crystallography, without the need for ancillary phase information.

KEYWORDS:

Ab initio; Crystallography; Iterative projection algorithm; Phasing; Virus

PMID:
27623229
DOI:
10.1016/j.jsb.2016.09.004
[Indexed for MEDLINE]

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