Continuous β-turn fold of an alternating alanyl/homoalanyl peptide nucleic acid.

Continuous β-turn fold of an alternating alanyl/homoalanyl peptide nucleic acid.
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交替丙氨酰/高丙氨酰肽核酸的连续β-转折叠

DOI:
10.1107/s090744491202118x
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发表时间:
2012
期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
--
通讯作者:
G. M. Sheldrick
G. M. Sheldrick
中科院分区:
--
文献类型:
--
作者:
J. A. Cuesta-Seijo;J. Zhang;U. Diederichsen;G. M. Sheldrick

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PNA(肽核酸)低聚物h - lys - halg - alag - halc - alag - halc - alag - halc - alac - lys - nh2 (PNA1, d构型氨基酸)的晶体结构已通过从头算直接方法确定,并根据1.0 Å数据进行了改进。不对称单元由一个四聚体笼组成,所有鸟嘌呤和胞嘧啶侧链取代基几乎理想的沃森-克里克C-G碱基配对。每条PNA链每秒都有一个90°β转的残基,由主链酰胺之间的三个氢键稳定。第一、第二、第五和第六碱基堆叠在单体的一侧,并与第二单体的相应互补碱基配对形成二聚体。所得到的二聚体每侧的两个剩余碱基与第二二聚体的互补碱基形成沃森-克里克对,形成独特的笼状结构。在同丙酰残基中额外的亚甲基基团使碱基的堆叠具有最佳的基面之间的距离,但也具有明显的横向位移(滑动)。
The crystal structure of the PNA (peptide nucleic acid) oligomer H–Lys–HalG–AlaG–HalC–AlaG–HalC–AlaC–Lys–NH2 (PNA1, amino acids with d-configuration are underlined, Ala = alanyl, Hal = homoalanyl) has been determined by ab initio direct methods and refined against 1.0 Å data. The asymmetric unit consists of a tetrameric cage with almost ideal Watson–Crick C–G base pairing of all the guanine and cytosine side-chain substituents. Each PNA strand has a 90° β-turn every second residue, stabilized by three hydrogen bonds between the backbone amides. The first, second, fifth and sixth bases stack on one side of the monomer and pair with the corresponding complementary bases of a second monomer to form a dimer. The two remaining bases on each side of the resulting dimer form Watson–Crick pairs with the complementary bases of a second dimer, leading to a unique cage structure. The extra methylene groups in the homoalanyl residues enable stacking of the bases with an optimal distance between base-planes but also with an appreciable lateral displacement (slide).
DOI: 10.1107/s0907444995011115
发表时间: 1996-01-01
期刊: ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
影响因子: --
作者:
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影响因子: 11.1
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发表时间: 2003-10-14
影响因子: 11.1
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通讯作者: Pedone, C