# Could statistical potential models achieve comparable or better performance than deep learning models?

## TL;DR

This paper shows that a well-designed statistical potential model, HybridSP, can outperform deep learning models in predicting protein-ligand interactions, offering high accuracy and interpretability.

## Contribution

Proposes HybridSP, a hybrid statistical potential model that combines multiple terms and achieves state-of-the-art performance in docking and screening.

## Key findings

- HybridSP achieves a 91.6% docking success rate on the CASF-2016 benchmark.
- It has an enrichment factor of 29.35 at the top 1% in virtual screening.
- The model outperforms deep learning approaches while maintaining interpretability.

## Abstract

Accurately predicting protein–ligand interactions is vital for structure-based drug discovery. Although deep learning (DL) models have shown strong performance, the potential of traditional statistical potentials under data-limited conditions remains underexplored. Here, we systematically assess several statistical potential models in docking and virtual screening. We find that docking benefits from distance-dependent pairwise atom–atom potentials with clear physical meanings, while screening relies more on orientation-dependent atom–residue potentials that capture local chemical environments. Based on these findings, we propose HybridSP, a hybrid potential combining distance-dependent atom–atom, atom–residue, and orientation-dependent atom–residue terms. An affinity-weighted scheme is applied to correct biases in statistical distributions. On the CASF-2016 benchmark, HybridSP achieves a 91.6% docking success rate and an enrichment factor of 29.35 at the top 1%, rivaling and even surpassing state-of-the-art DL models. Its strong screening ability is further validated on directory of useful decoys-enhanced and directory of useful decoys-adjusted. These results demonstrate that well-designed statistical potentials can achieve high performance and interpretability without complex DL architectures, offering an efficient alternative for scoring function design. The models are available at: https://github.com/zelixirSH/HybridSP.git.