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Requirements for efficient endosomal escape by designed mini-proteins.

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ZF5.3 mini-protein efficiently escapes endosomes by pH-induced unfolding and specific lipid binding. This mechanism enables targeted delivery of proteins to the cytosol or nucleus, crucial for therapeutic applications.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Protein Engineering

Background:

  • ZF5.3 is a 27-amino acid mini-protein capable of delivering cargo into the cytosol and nucleus.
  • The mechanism by which ZF5.3 traverses endocytic membranes remains largely unknown.
  • Efficient endosomal escape is critical for delivering therapeutic molecules to intracellular targets.

Purpose of the Study:

  • To delineate the attributes of ZF5.3 that enable efficient endosomal escape.
  • To understand the role of pH, protein stability, and lipid interactions in ZF5.3's mechanism.
  • To inform the design of novel protein delivery systems.

Main Methods:

  • High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy to determine ZF5.3 structure and pH-dependent unfolding.
  • Circular dichroism (CD) spectroscopy to assess protein stability.
  • Reconstituted liposome assays to study lipid-protein interactions.
  • Cell-based assays to evaluate endosomal escape efficiency.

Main Results:

  • ZF5.3 is stable at neutral and mildly acidic pH but unfolds cooperatively at lower pH due to protonation of a Zn(II)-binding histidine.
  • pH-induced unfolding, essential for endosomal escape, correlates with the late endosomal lumen pH.
  • ZF5.3 exhibits high-affinity binding to BMP lipid, which is enriched in late endosomes and shows stronger interaction at low pH.
  • A ZF5.3 analog stable at pH 4.5 showed impaired cytosolic delivery, confirming the necessity of pH-induced unfolding.

Conclusions:

  • ZF5.3 utilizes pH-induced unfolding and specific lipid interactions for efficient endosomal escape.
  • The penta-arginine motif and zinc-finger fold are integrated into an alpha-helix, contributing to its stability and function.
  • Understanding these mechanisms provides a framework for designing protein-based delivery systems for therapeutic applications.