首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Conformation of cyclo(Gly-L-Pro-L-Pro-Gly-L-Pro-L-Pro)2Mg2+ complex crystallized from C2H3CN solution
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Conformation of cyclo(Gly-L-Pro-L-Pro-Gly-L-Pro-L-Pro)2Mg2+ complex crystallized from C2H3CN solution

机译:从C2H3CN溶液中结晶出来的环(Gly-L-Pro-L-Pro-Gly-L-Pro-L-Pro)2Mg2 +配合物的构象

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摘要

The cyclic hexapeptides (Gly-L-Pro-L-Pro-Gly-L-Pro-L-Pro) in the (peptide—Mg—peptide)2+ complex have nearly identical asymmetric conformations. Each has two cis Pro-Pro linkages and lacks any intraring hydrogen bonds. The Mg2+ ion forms six ligands in a regular octahedral array with the carbonyl oxygen atoms of the two Gly residues and one Pro residue of each peptide. The “sandwich” complex has an approximate 2-fold rotation axis through the Mg2+ relating the two peptide moieties. Cyclo(Gly-Pro-Pro-Gly-Pro-Pro)2Mg(ClO4)2· 4C2H3CN crystallizes in space group P31 with a = b = 15.744(4) Å, c = 24.002(6) Å, γ = 120°, and Z = 3. A highlight of the structure determination is the ready location of the Mg self-vector in a Harker section and the development of the entire structure by use of the tangent formula starting with the known position of the Mg atom.
机译:(肽-Mg-肽)2+ 复合物中的环状六肽(Gly-L-Pro-L-Pro-Gly-L-Pro-L-Pro)具有几乎相同的不对称构象。每个都有两个顺式Pro-Pro键,并且没有任何环内氢键。 Mg 2 + 离子在规则的八面体阵列中形成六个配体,每个肽的两个Gly残基和一个Pro残基的羰基氧原子。 “三明治”复合物通过与两个肽部分相关的Mg 2 + 具有大约2倍的旋转轴。环(Gly-Pro-Pro-Gly-Pro-Pro)2Mg(ClO4)2·4C 2 H3CN在空间群P31中结晶,a = b = 15.744(4)Å,c = 24.002( 6)Å,γ= 120°,Z =3。确定结构的重点是在Harker截面中准备好Mg自矢量的位置,并使用从切线开始的切线公式展开整个结构。 Mg原子的已知位置。

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