ANABAG: Annotated Antibody-Antigen Data Set with Unique Features for Antibody Engineering Applications.

The analysis and prediction of antibody-antigen (Ab-Ag) interactions often overlook critical structural features such as glycosylation and important physicochemical conditions like pH and salt concentration. Additionally, the field lacks standardized criteria for selecting complexes based on structural properties and sequence identity. Common practices in data set construction rely on removing redundancy using sequence identity thresholds, which can inadvertently exclude complexes with alternative binding modes that share identical sequences. To enable more precise Ab-Ag modeling and antibody engineering, it is essential to incorporate richer structural and physical information into both physics-based and machine learning models. To address these limitations, we present ANABAG, a new curated data set of Ab-Ag complexes annotated at the residue level with UniProt sequence information and enriched with a wide range of structural and physicochemical features. The data set allows flexible filtering of complexes using a variety of descriptors available at both the complex and residue levels. Selected features are ready to use in machine learning workflows, while the structural files are compatible with antibody design and docking pipelines like Rosetta or Haddock. The complete data set is available on Zenodo at https://zenodo.org/records/17065788, and all accompanying scripts and usage documentation can be accessed via GitHub at https://github.com/DSIMB/anabag-handler.git.