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Here, we present a biosynthesized material M1 for immune checkpoint blocking therapy. M1 could realize a morphological transformation from globular to fibrous in situ in the presence of cathepsin B (CtsB) after entering tumor cells. The GO203 peptides of M1 are exposed, which could bind to mucin 1 (MUC1) to suppress the homodimerization process of MUC1, thereby downregulating PD-L1 expression.

Graphical abstract: Biosynthesis of multifunctional transformable peptides for downregulation of PD-L1

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