Abstract

Comprehensive SummaryControlling the conformational transition of polypeptides under slightly acidic environment is challenging. Herein, we report a class of pH‐responsive helix‐to‐coil conformationally transitionable polypeptides (pCTPs) by simply conjugating tertiary amine groups (TAs) to polylysine. Their conformation is highly dependent on the charge state of TAs, showing a helical structure when most TAs are deprotonated and a non‐helical structure when majority of TAs are protonated. The conformational transition pH can be modulated by tuning the hydrophobicity of TAs and the incorporation of hydrophobic monomers at a pH range of 7.2 to 6.0. Such pCTP showed a vesicle‐to‐micelle transition when their conformation transformed from helix to coil, facilitating controlled drug release. Our study provided an approach to control the conformational transition of polypeptides under slightly acidic condition.

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