Oligoglycines designed in a star-like fashion, so-called tri- and tetraantennary molecules, were found to form highly ordered supramers in aqueous medium. The formation of these supramers occurred either spontaneously or due to the assistance of a mica surface. The driving force of the supramer formation is hydrogen bonding, the polypeptide chain conformation is related to the folding of helical polyglycine II (PG II). Tri- and tetraantennary molecules are capable of association if the antenna length reach 7 glycine (Gly) residues. Properties of similar biantennary molecules have not been investigated yet, and we compared their self-aggregating potency with similar tri- and tetraantennary analogs. Here, we synthesized oligoglycines of the general formula R-Glyn-Х-Glyn-R (X = -HN-(СН2)m-NH-, m = 2, 4, 10; n = 1–7) without pendant ligands (R = H) and with two pendant sialoligands (R = sialic acid or sialooligosaccharide). Biantennary oligoglycines formed PG II aggregates, their properties, however, differ from those of the corresponding tri- and tetraantennary oligoglycines. In particular, the tendency to aggregate starts from Gly4 motifs instead of Gly7. The antiviral activity of end-glycosylated peptides was studied, and all capable of assembling glycopeptides demonstrated an antiviral potency which was up to 50 times higher than the activity of peptide-free glycans.
设计成星形的寡甘氨酸,即三和四分枝分子,在水介质中被发现形成高度有序的超聚物。这些超聚物的形成要么是自发的,要么是由云母表面的帮助引起的。超聚物形成的推动力是氢键作用,多肽链构象与螺旋聚甘氨酸II(PG II)的折叠有关。如果分支长度达到7个甘氨酸(Gly)残基,三和四分枝分子能够发生关联。类似的双分枝分子的性质尚未被研究,我们将它们的自聚集能力与类似的三和四分枝分子进行了比较。在这里,我们合成了一般公式R-Glyn-Х-Glyn-R(X = -HN-(СН2)m-NH-,m = 2, 4, 10;n = 1–7)的寡甘氨酸,没有挂链(R = H)和带有两个挂链唾液酸配体(R = 唾液酸或唾液寡糖)。双分枝寡甘氨酸形成PG II聚集体,然而,它们的性质与相应的三和四分枝寡甘氨酸不同。特别是,聚集的倾向从Gly4基序开始,而不是Gly7。研究了末端糖基化肽的抗病毒活性,所有能够组装糖肽的肽均表现出高达50倍于无肽的糖的活性的抗病毒效力。