Document Detail


A two-dimensional histogram-matching method for protein phase refinement and extension.
MedLine Citation:
PMID:  10531488     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A new method has been developed for protein phase improvement using the joint distribution of the electron density and its gradient (two-dimensional histogram) as a constraint in a density-modification procedure. Matching the two-dimensional (2D) histogram of a given map to that of an ideal 2D histogram was achieved through alternating applications of one-dimensional (1D) histogram matching on electron density and on density gradient. The 2D histogram-matching method was compared with the 1D density histogram-matching method for phase refinement and extension starting from either medium-resolution or high-resolution data on three different types of phases. These included phase refinement and extension using MIR phases of T(6) insulin and phases with randomly generated errors. The test results demonstrated significant improvement of the phases and the overall map quality using the 2D histogram-matching method compared with the 1D density histogram-matching method in each of the three test cases.
Authors:
Y P Nieh; K Y Zhang
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Acta crystallographica. Section D, Biological crystallography     Volume:  55     ISSN:  0907-4449     ISO Abbreviation:  Acta Crystallogr. D Biol. Crystallogr.     Publication Date:  1999 Nov 
Date Detail:
Created Date:  2000-01-27     Completed Date:  2000-01-27     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9305878     Medline TA:  Acta Crystallogr D Biol Crystallogr     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  1893-900     Citation Subset:  IM    
Affiliation:
Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N, Seattle, Washington 98109, USA.
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Crystallography, X-Ray / methods*
Fibroblast Growth Factors / chemistry
Fourier Analysis
Insulin / chemistry
Proteins / chemistry*
Grant Support
ID/Acronym/Agency:
R29GM55663/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
0/Proteins; 11061-68-0/Insulin; 62031-54-3/Fibroblast Growth Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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