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Science 5 April 1991:
Vol. 252. no. 5002, pp. 128 - 133
DOI: 10.1126/science.2011749
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Articles

Science, Vol 252, Issue 5002, 128-133
Copyright © 1991 by American Association for the Advancement of Science

articles

Low-resolution real-space envelopes: an approach to the ab initio macromolecular phase problem

S Subbiah

Beckman Laboratories for Structural Biology, Department of Cell Biology, Stanford University School of Medicine, CA 94305.

An ab initio approach to the phase problem in macromolecular x-ray crystallography is described. A random gas of hard-sphere point scatterers is allowed to condense under the constraint of the solvent fraction and the restraint of the observed Fourier amplitude data. Two applications to real macromolecular examples are discussed. This method produces an approximate outline of the bulk solvent regions and thus yields a low-resolution picture of the unit cell that can be extended to higher resolutions in special cases, such as through the use of molecular replacement or of noncrystallographic symmetry-based phase extension.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Ambiguities in Ab Initio Phasing.
T. O. Yeates and K. Y. J. Zhang (1993)
Science 259, 1771-1772
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Response.
S. Subbiah (1993)
Science 259, 1772
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