Predicting Cell-Penetrating Peptides
and their Subcellular Localization

CPPLocPred identifies Cell-Penetrating Peptides and predicts their subcellular destination – Cytoplasm, Mitochondria, Nucleus, Endo_lysosome and Others – using Machine Learning models trained on experimentally validated sequences.

CPPLocPred Subcellular Localization
Reference: Raghava et al. (2025) CPPLocPred: Machine learning-based prediction and subcellular localization of cell-penetrating peptides.   |   Dataset: 1366 experimentally validated CPP sequences   |  

CPP Classification

Identify whether a peptide sequence has cell-penetrating activity using ExtraTree (ET)-based ML model trained on curated experimental data.

Subcellular Localization

Predict the intracellular destination of CPPs - Cytoplasm, Mitochondria, Nucleus, Endo_lysosome and Others.

Motif Search

Scan full-length protein sequences to discover embedded CPP motifs and map localization-determining sequence patterns.

About CPPLocPred

Understanding where peptides go inside cells

Cell-penetrating peptides (CPPs) are short peptides, typically 5–30 amino acids, capable of crossing lipid bilayer membranes. They are widely studied as vectors for intracellular drug delivery, gene therapy, and molecular imaging agents.

Understanding not only whether a peptide is cell-penetrating, but where it localizes inside the cell, is critical for rational design of targeted therapeutics. CPPLocPred provides a comprehensive in silico platform addressing both questions in a single submission.

The server is built on a curated dataset of experimentally validated CPP sequences with confirmed subcellular localization, enabling high-confidence predictions for novel peptide sequences submitted by users.

Predicted Subcellular Locations

Cytoplasm

General cytosolic distribution following membrane translocation.

Nucleus

Nuclear-targeted CPPs bearing NLS-like recognition sequences.

Mitochondria

Mitochondria-penetrating peptides with MTS targeting signals.

Endo_lysosome

Vesicular or endoplasmic reticulum targeting motif patterns.

Others

Targeting other subcelluar locations.

CPPLocPred Workflow
CPPLocPred Workflow