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首页> 外文期刊>Acta crystallographica.Section D. Biological crystallography >An introduction to stereochemical restraints.
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An introduction to stereochemical restraints.

机译:介绍了立体化学的限制。

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摘要

At the resolution available from most macromolecular crystals, the X-ray data alone are insufficient to lead to a chemically reasonable structure, so stereochemical restraints are essential. These usually restrain bond lengths, bond angles, planes and chiral volumes. The definition of these restraints and where the values come from are described. A dictionary entry contains information about the atom types, their connectivity and all the appropriate restraints. Torsion angles are not usually restrained, but they do have optimum values. In the special case of flexible five- and six-membered rings, including pentose and hexose sugars, the ring pucker is defined by combinations of torsion angles and the pucker affects the position of substituents.
机译:在大多数可用的决议大分子晶体,独自的x射线数据不足以导致化学合理结构,所以立体化学的限制必不可少的。键角、飞机和手性卷。这些限制的定义值来自描述。atom条目包含信息类型,他们的连通性和所有适当的限制。克制,但他们确实有最佳值。五年和灵活的特殊情况六元环,包括戊糖和己糖糖,定义的戒指的瞬间组合的扭转角度和皱纹影响取代基的位置。

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