作者:T. A. Gudasheva、S. S. Trofimov、A. A. Morozova、S. V. Nikitin、R. U. Ostrovskaya、T. A. Voronina、S. B. Seredenin
DOI:10.1007/s11094-006-0049-z
日期:2006.1
A novel approach to the search for the new groups of biologically active peptides is developed, which is based on the selection of point mutants with respect to noncritical amino acid residues. Using a gene site encoding the arginine vasopressin AVP(4–5) sequence, which corresponds to the pGlu-Asn-NH2 nootropic dipeptide, three point mutants with respect to Asn (pGlu-Ser-NH2, pGlu-Asp-NH2, and pGlu-His-NH2) have been synthesized. The first two peptides (corresponding to transitions of the 1st and 2nd bases, respectively) display nootropic activity in the passive avoidance test in rats at a dose of 0.1 mg/kg (i.p.). The last peptide (corresponding to a transversion of the 1st base) proved to be inactive. Both active peptides exhibit electronic and structural differences from the parent dipeptide: pGlu-Asp-NH2 bears a negative charge and contains a primary alcohol group instead of the amide moiety. Using the proposed method, it is possible to create genetically related analogs of well-known neuropeptides with substantially different structures.
提出了一种筛选生物活性多肽新家族的新方法,该方法基于对非关键氨基酸残基的点突变进行筛选。利用编码精氨酸加压素AVP(4-5)序列的基因位点,该序列对应于吡咯烷-天冬酰胺-NH2新型二肽,合成了三种关于天冬酰胺的点突变体(吡咯烷-丝氨酸-NH2、吡咯烷-天冬氨酸-NH2和吡咯烷-组氨酸-NH2)。前两种肽(分别对应于第一和第二碱基的转换)在被动回避测试中对大鼠显示出新型活性,剂量为0.1 mg/kg(腹腔注射)。最后一种肽(对应于第一碱基的颠换)被证明是无活性的。两种活性肽与母体二肽在电子和结构上存在差异:吡咯烷-天冬氨酸-NH2带负电荷,并含有一个一级醇基团,而不是酰胺部分。使用所提出的方法,可以创建结构明显不同的已知神经肽的基因相关类似物。