两种具有不同ΔPhe残基构型的十五脱氢肽。
Two pentadehydropeptides with different configurations of the DeltaPhe residues.
作者信息
Makowski Maciej, Lisowski Marek, Maciag Anna, Wiktor Maciej, Szlachcic Anna, Lis Tadeusz
机构信息
Institute of Chemistry, University of Opole, 48 Oleska Street, 45-052 Opole, Poland.
出版信息
Acta Crystallogr C. 2010 Mar;66(Pt 3):o119-23. doi: 10.1107/S0108270110003094. Epub 2010 Feb 3.
Comparison of the crystal structures of two pentadehydropeptides containing DeltaPhe residues, namely (Z,Z)-N-(tert-butoxycarbonyl)glycyl-alpha,beta-phenylalanylglycyl-alpha,beta-phenylalanylglycine (or Boc(0)-Gly(1)-Delta(Z)Phe(2)-Gly(3)-Delta(Z)Phe(4)-Gly(5)-OH) methanol solvate, C(29)H(33)N(5)O(8) x CH(4)O, (I), and (E,E)-N-(tert-butoxycarbonyl)glycyl-alpha,beta-phenylalanylglycyl-alpha,beta-phenylalanylglycine (or Boc(0)-Gly(1)-Delta(E)Phe(2)-Gly(3)-Delta(E)Phe(4)-Gly(5)-OH), C(29)H(33)N(5)O(8), (II), indicates that the Delta(Z)Phe residue is a more effective inducer of folded structures than the Delta(E)Phe residue. The values of the torsion angles phi and psi show the presence of two type-III' beta-turns at the Delta(Z)Phe residues and one type-II beta-turn at the Delta(E)Phe residue. All amino acids are linked trans to each other in both peptides. Beta-turns present in the peptides are stabilized by intramolecular 4-->1 hydrogen bonds. Molecules in both structures form two-dimensional hydrogen-bond networks parallel to the (100) plane.
两种含有ΔPhe残基的十五脱氢肽，即（Z，Z）-N-（叔丁氧羰基）甘氨酰-α，β-苯丙氨酰甘氨酰-α，β-苯丙氨酰甘氨酸（或Boc(0)-Gly(1)-Δ(Z)Phe(2)-Gly(3)-Δ(Z)Phe(4)-Gly(5)-OH）甲醇溶剂化物，C(29)H(33)N(5)O(8)·CH(4)O，（I），和（E，E）-N-（叔丁氧羰基）甘氨酰-α，β-苯丙氨酰甘氨酰-α，β-苯丙氨酰甘氨酸（或Boc(0)-Gly(1)-Δ(E)Phe(2)-Gly(3)-Δ(E)Phe(4)-Gly(5)-OH），C(29)H(33)N(5)O(8)，（II）的晶体结构比较表明，Δ(Z)Phe残基比Δ(E)Phe残基更有效地诱导折叠结构。扭转角φ和ψ的值表明在Δ(Z)Phe残基处存在两个III'型β-转角，在Δ(E)Phe残基处存在一个II型β-转角。两种肽中的所有氨基酸均相互反式连接。肽中存在的β-转角通过分子内4→1氢键得以稳定。两种结构中的分子形成平行于（100）平面的二维氢键网络。
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