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（伪）对称性带来的意外与陷阱。

Surprises and pitfalls arising from (pseudo)symmetry.

作者信息

Zwart Peter H, Grosse-Kunstleve Ralf W, Lebedev Andrey A, Murshudov Garib N, Adams Paul D

机构信息

Berkeley Center for Structural Biology, Lawrence Berkeley National Laboratory, One Cyclotron Road, Building 6R2100, Berkeley, CA 94720, USA.

出版信息

Acta Crystallogr D Biol Crystallogr. 2008 Jan;64(Pt 1):99-107. doi: 10.1107/S090744490705531X. Epub 2007 Dec 5.

DOI:10.1107/S090744490705531X
PMID:18094473
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2394827/
Abstract

It is not uncommon for protein crystals to crystallize with more than a single molecule per asymmetric unit. When more than a single molecule is present in the asymmetric unit, various pathological situations such as twinning, modulated crystals and pseudo translational or rotational symmetry can arise. The presence of pseudosymmetry can lead to uncertainties about the correct space group, especially in the presence of twinning. The background to certain common pathologies is presented and a new notation for space groups in unusual settings is introduced. The main concepts are illustrated with several examples from the literature and the Protein Data Bank.

摘要

蛋白质晶体在不对称单元中结晶时含有不止一个分子的情况并不罕见。当不对称单元中存在不止一个分子时，可能会出现各种病理情况，如孪晶、调制晶体以及伪平移或旋转对称性。伪对称性的存在可能导致关于正确空间群的不确定性，尤其是在存在孪晶的情况下。本文介绍了某些常见病理情况的背景，并引入了一种用于特殊情况下空间群的新表示法。通过文献和蛋白质数据库中的几个例子说明了主要概念。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/46217ae4dd0e/d-64-00099-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/46aa9e1d1b02/d-64-00099-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/85094641a8e7/d-64-00099-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/2bff9eff85b3/d-64-00099-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/35b83141d237/d-64-00099-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/005b799aef20/d-64-00099-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/666b24036cd0/d-64-00099-fig6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/46217ae4dd0e/d-64-00099-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/46aa9e1d1b02/d-64-00099-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/85094641a8e7/d-64-00099-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/2bff9eff85b3/d-64-00099-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/35b83141d237/d-64-00099-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/005b799aef20/d-64-00099-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/666b24036cd0/d-64-00099-fig6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/17db/2644920/46217ae4dd0e/d-64-00099-fig7.jpg

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