Complete Lab Protocol for Cell-Penetrating Peptide Delivery Systems | Research

The takeaway

A comprehensive, reproducible protocol covers isolation, characterization, and cellular uptake analysis of cell-penetrating peptide fusion proteins and supercharged proteins.

Full workflow protocol
From protein isolation through cellular uptake quantification — standardized and reproducible

What the researchers found

A comprehensive and replicable protocol for isolation, biochemical characterization, and quantitative cellular uptake analysis of CPP-fusion proteins and supercharged proteins was developed and validated.

Why it matters

Standardized protocols accelerate the field of intracellular drug delivery by enabling researchers to reliably produce and test cell-penetrating peptide systems.

How the study worked

Methods development paper providing protocols for protein isolation, characterization, and quantitative cellular uptake analysis using MeCP2 CPP-fusion constructs as a model system.

What this study cannot tell us

Protocol validated with MeCP2 constructs — may need optimization for other protein cargoes. In vitro cellular uptake may not predict in vivo delivery efficiency.

How to read the evidence

Methods/protocol paper — provides technical guidance rather than clinical evidence.

When this study was published

Published in 2026; reflects current best practices in CPP research.

The bigger picture

Cell-penetrating peptides are central to next-generation drug delivery, including for gene therapies and biologics. Reliable protocols enable broader adoption of this technology.

Questions still open

Can this protocol be adapted for clinical-grade CPP-drug conjugate production?
How do different CPP sequences affect uptake efficiency across cell types?

Common questions

What are cell-penetrating peptides used for?

CPPs are short peptide sequences that can carry large molecules — including drugs, proteins, and genetic material — across cell membranes, enabling delivery of therapies that otherwise cannot enter cells.

What are supercharged proteins?

Supercharged proteins are engineered to have an unusually high positive or negative surface charge, which allows them to cross cell membranes efficiently and deliver molecular cargoes inside cells.

Read the original research

Cell-Penetrating Peptides and Supercharged Proteins: A Comprehensive Protocol from Isolation to Cellular Uptake.

Molecular pharmaceutics, 23(3), 1845-1857

View on PubMed ↗Publisher’s paper ↗

Citation

Beribisky, Alexander V; Sarne, Victoria; Huber, Anna; Hengstschläger, Markus; Laccone, Franco; Steinkellner, Hannes. (2026). Cell-Penetrating Peptides and Supercharged Proteins: A Comprehensive Protocol from Isolation to Cellular Uptake.. Molecular pharmaceutics, 23(3), 1845-1857. https://doi.org/10.1021/acs.molpharmaceut.5c01560