Compstatin analogues having improved binding and complement-inhibiting activity as compared to the 13 amino acid compstatin peptide (ICWQDWGHHRCT (cyclic C2-C12)) are described, in particular compstatin analogues that additionally possess useful physicochemical properties. The analogues have a thioether bond rather than a disulfide bond between the side chains of the residues corresponding to cysteines 2 and 12 of compstatin which may increase stability. The analogues may also have an isoleucine residue at position 3 in place of the wild type valine residue, which provides compstatin peptides with improved binding and complement-inhibiting activity and also enables the introduction of other modifications, for example modifications that are capable of increasing solubility, such as the introduction of charged or polar amino acids at position 9 and/or the introduction of N- and/or C-terminal sequences.
描述了与13
氨基酸compstatin肽(ICWQDWGHHRCT(环C2-C12))相比具有改进结合和抑制补体活性的Compstatin类似物,特别是还具有有用的物理
化学性质的Compstatin类似物。这些类似物在与compstatin的半胱
氨酸2和12号残基相对应的侧链之间具有
硫醚键而不是二
硫键,这可能增加稳定性。这些类似物还可能在位置3处具有
异亮氨酸残基,取代野生型缬
氨酸残基,这为compstatin肽提供了改进的结合和抑制补体活性,并且还能引入其他修饰,例如能够增加溶解度的修饰,比如在位置9处引入带电或极性
氨基酸以及N-和/或C-末端序列的引入。