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'''Crystal Structure Analysis of Human lysozyme at 147K.''' | '''Crystal Structure Analysis of Human lysozyme at 147K.''' | ||
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[[Category: Kidera, A.]] | [[Category: Kidera, A.]] | ||
[[Category: Nakasako, M.]] | [[Category: Nakasako, M.]] | ||
[[Category: | [[Category: Glycosydase]] | ||
[[Category: | [[Category: O-glycosyl]] | ||
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Revision as of 20:31, 2 May 2008
Crystal Structure Analysis of Human lysozyme at 147K.
OverviewOverview
The static and dynamic structures of human lysozyme at seven different temperatures ranging from 113 to 178 K were investigated by normal-mode refinement of the cryogenic X-ray diffraction data collected from a single crystal. Normal-mode refinement decomposes the mean-square fluctuations of protein atoms from their average position into the contributions from the internal degrees of freedom, which change the shape of the protein structure, and those from the external degrees of freedom, which generate rigid-body motions in the crystal. While at temperatures below 150 K the temperature dependence of the total mean-square fluctuations shows a small gradient similar to that predicted theoretically by normal-mode analysis, at temperatures above 150 K there is an apparent inflection in the temperature dependence with a higher gradient. The inflection in the temperature dependence at temperatures above 150 K occurs mostly in the external degrees of freedom. Possible causes for the dynamic transition are discussed with respect to the crystal packing and physicochemical properties of crystalline water.
About this StructureAbout this Structure
1IWV is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Nonlinear temperature dependence of the crystal structure of lysozyme: correlation between coordinate shifts and thermal factors., Joti Y, Nakasako M, Kidera A, Go N, Acta Crystallogr D Biol Crystallogr. 2002 Sep;58(Pt 9):1421-32. Epub 2002, Aug 23. PMID:12198298 Page seeded by OCA on Fri May 2 20:31:20 2008