Actinobacteria are a major source of bioactive natural products and exhibit an unusually high transcription factor (TF) abundance. In Streptomyces coelicolor, TFs constitute 12–15% of protein-coding genes — more than double the proportion in Escherichia coli and comparable to simple eukaryotes.
TF activity is finely regulated by diverse small-molecule ligands (e.g., second messengers, metabolites, antibiotics), and TF–ligand interactions are central to environmental sensing and pathway control. Nonetheless, despite progress from high‑throughput methods, actinobacterial regulatory data remain fragmented.
In a study published in the KeAi journal Engineering Microbiology, a group of researchers led by Professor Bang-Ce Ye and Di You from East China University of Science and Technology reported the development of Actinobacteria Transcription Factor Database (TFDB; http://mingleadgene.com:9315/#/home). The database integrates 629 TFs from 25 representative species, including targets, ligands and posttranslational modifications, providing a unified platform for network analysis.
Actinobacteria TFDB features a TF-regulatory ligand (RL) module covering ligands such as second messengers, acyl-CoAs, amino acids and antibiotics. Ligand binding allosterically modulates transcription, as seen in BldD (c-di-GMP/NO) and AccR (acyl-CoAs).
The database supports search by TF, ligand or species, with links to UniProt and PDB. Applications include activating silent biosynthetic gene clusters, reverse engineering regulatory networks, and cross‑species functional prediction.
Future updates will integrate more genomes, binding‑site analysis and network visualization.
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