Efficient synthesis and comparative studies of the arginine and Nω,Nω‐dimethylarginine forms of the human nucleolin glycine/arginine rich domain

Efficient synthesis and comparative studies of the arginine and Nω,Nω‐dimethylarginine forms of the human nucleolin glycine/arginine rich domain
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人核蛋白甘氨酸/精氨酸富集域的精氨酸和 Nω,Nω-二甲基精氨酸形式的高效合成和比较研究

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发表时间:
2005
期刊:
影响因子:
--
通讯作者:
S. Pongor
S. Pongor
中科院分区:
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文献类型:
--
作者:
S. Zahariev;C. Guarnaccia;F. Zanuttin;A. Pintar;G. Esposito;G. Maravić;B. Krust;A. Hovanessian;S. Pongor

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人类核仁素富含甘氨酸和精氨酸的C末端区域是一个61个残基的长结构域,参与许多蛋白质-蛋白质和蛋白质-核酸相互作用。该结构域含有10个aDma残基,以aDma-GG重复的形式散布有Phe残基。精氨酸二甲基化的确切作用尚不清楚,部分原因是缺乏有效的合成方法。这项工作描述了一种有效的合成策略,通常适用于长RGG肽,基于侧链保护的aDMA和骨架保护的二肽Fmoc-Gly-(Dmob)Gly-OH。这种策略使我们能够以高产率(约26%)和纯度合成未修饰的(N61 Arg)和二甲基化的(N61 aDma)肽。通过NMR光谱检测,N61 Arg在溶液中不具有任何稳定的二级或三级结构,胍基的Nω,Nω-二甲基化不会改变该肽的总体构象倾向。虽然两种肽以相似的亲和力(Kd = 1.5 × 10−7 M)结合单链核酸,但它们在ssDNA亲和色谱中表现出与pKa值差异一致的不同行为。先前已经表明,N61 Arg在HIV附着于细胞的阶段抑制HIV感染。这项研究表明,精氨酸二甲基化的C末端结构域缺乏任何抑制活性,提出了细胞表面表达的核仁素是否确实被二甲基化的问题。版权所有© 2004年欧洲肽协会和约翰威利父子有限公司。
The Gly‐ and Arg‐rich C‐terminal region of human nucleolin is a 61‐residue long domain involved in a number of protein–protein and protein–nucleic acid interactions. This domain contains 10 aDma residues in the form of aDma‐GG repeats interspersed with Phe residues. The exact role of Arg dimethylation is not known, partly because of the lack of efficient synthetic methods. This work describes an effective synthetic strategy, generally applicable to long RGG peptides, based on side‐chain protected aDma and backbone protected dipeptide Fmoc‐Gly‐(Dmob)Gly‐OH. This strategy allowed us to synthesize both the unmodified (N61Arg) and the dimethylated (N61aDma) peptides with high yield (∼26%) and purity. As detected by NMR spectroscopy, N61Arg does not possess any stable secondary or tertiary structure in solution and Nω,Nω‐dimethylation of the guanidino group does not alter the overall conformational propensity of this peptide. While both peptides bind single‐stranded nucleic acids with similar affinities (Kd = 1.5 × 10−7 M), they exhibit a different behaviour in ssDNA affinity chromatography consistent with the difference in pKa values. It has been previously shown that N61Arg inhibits HIV infection at the stage of HIV attachment to cells. This study demonstrates that Arg‐dimethylated C‐terminal domain lacks any inhibition activity, raising the question of whether nucleolin expressed on the cell‐surface is indeed dimethylated. Copyright © 2004 European Peptide Society and John Wiley & Sons, Ltd.
布氏锥虫线粒体引导 RNA 结合蛋白的精氨酸甲基化。
DOI: 10.1016/s0166-6851(01)00367-x
发表时间: 2001
影响因子: 1.5
作者:
Pelletier,M;Xu,Y;Wang,X;Zahariev,S;Pongor,S;Aletta,JM;Read,LK
通讯作者: Read,LK
肽树脂脱保护和裂解的 TMSBr 方法的改进:应用于大肽。
DOI: --
发表时间: 1996
期刊: Peptide research.
影响因子: --
作者:
Sparrow,JT;Monera,OD
通讯作者: Monera,OD
DOI: 10.1006/jmbi.1999.3110
发表时间: 1999-10-22
影响因子: 5.6
作者:
Wright, PE;Dyson, HJ
通讯作者: Dyson, HJ