The concepts of polymer–peptide conjugation and self-assembly were applied to antimicrobial peptides (AMPs) in the development of a targeted antimalaria drug delivery construct. This study describes the synthesis of α-acetal, ω-xanthate heterotelechelic poly(N-vinylpyrrolidone) (PVP) via reversible addition–fragmentation chain transfer (RAFT)-mediated polymerization, followed by postpolymerization deprotection to yield α-aldehyde, ω-thiol heterotelechelic PVP. A specific targeting peptide, GSRSKGT, for Plasmodium falciparum-infected erythrocytes was used to sparsely decorate the α-chain ends via reductive amination while cyclic decapeptides from the tyrocidine group were conjugated to the ω-chain end via thiol–ene Michael addition. The resultant constructs were self-assembled into micellar nanoaggregates whose sizes and morphologies were determined by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The in vitro activity and selectivity of the conjugates were evaluated against intraerythrocytic P. falciparum parasites.
在开发一种靶向抗疟疾药物递送结构的过程中,将聚合物-肽共轭和自组装的概念应用于抗菌肽(
AMP)。本研究描述了通过可逆加成-断裂链转移(RAFT)聚合合成α-
乙缩醛、ω-黄原酸盐杂环聚(
N-乙烯基吡咯烷酮)(PVP),然后进行聚合后脱保护,得到α-醛、ω-
硫醇杂环聚(
N-乙烯基吡咯烷酮)。一种针对恶性疟原虫感染红细胞的特异性靶向肽GSRSKGT通过还原胺化作用稀疏地修饰α-链末端,而来自tyrocidine基团的环状十肽通过
硫醇-烯基迈克尔加成作用与ω-链末端共轭。所得结构自组装成胶束纳米聚集体,其大小和形态通过动态光散射(DLS)和透射电子显微镜(
TEM)测定。体外活性和对恶性疟原虫红细胞内寄生虫的选择性通过体外活性和对恶性疟原虫红细胞内寄生虫的选择性进行评估。