AI-ACCELERATED DRUG DISCOVERY
Available from Reaxense
This protein is integrated into the Receptor.AI ecosystem as a prospective target with high therapeutic potential. We performed a comprehensive characterization of Protein-arginine deiminase type-4 including:
1. LLM-powered literature research
Our custom-tailored LLM extracted and formalized all relevant information about the protein from a large set of structured and unstructured data sources and stored it in the form of a Knowledge Graph. This comprehensive analysis allowed us to gain insight into Protein-arginine deiminase type-4 therapeutic significance, existing small molecule ligands, relevant off-targets, and protein-protein interactions.
Fig. 1. Preliminary target research workflow
2. AI-Driven Conformational Ensemble Generation
Starting from the initial protein structure, we employed advanced AI algorithms to predict alternative functional states of Protein-arginine deiminase type-4, including large-scale conformational changes along "soft" collective coordinates. Through molecular simulations with AI-enhanced sampling and trajectory clustering, we explored the broad conformational space of the protein and identified its representative structures. Utilizing diffusion-based AI models and active learning AutoML, we generated a statistically robust ensemble of equilibrium protein conformations that capture the receptor's full dynamic behavior, providing a robust foundation for accurate structure-based drug design.
Fig. 2. AI-powered molecular dynamics simulations workflow
3. Binding pockets identification and characterization
We employed the AI-based pocket prediction module to discover orthosteric, allosteric, hidden, and cryptic binding pockets on the protein’s surface. Our technique integrates the LLM-driven literature search and structure-aware ensemble-based pocket detection algorithm that utilizes previously established protein dynamics. Tentative pockets are then subject to AI scoring and ranking with simultaneous detection of false positives. In the final step, the AI model assesses the druggability of each pocket enabling a comprehensive selection of the most promising pockets for further targeting.
Fig. 3. AI-based binding pocket detection workflow
4. AI-Powered Virtual Screening
Our ecosystem is equipped to perform AI-driven virtual screening on Protein-arginine deiminase type-4. With access to a vast chemical space and cutting-edge AI docking algorithms, we can rapidly and reliably predict the most promising, novel, diverse, potent, and safe small molecule ligands of Protein-arginine deiminase type-4. This approach allows us to achieve an excellent hit rate and to identify compounds ready for advanced lead discovery and optimization.
Fig. 4. The screening workflow of Receptor.AI
Receptor.AI, in partnership with Reaxense, developed a next-generation technology for on-demand focused library design to enable extensive target exploration.
The focused library for Protein-arginine deiminase type-4 includes a list of the most effective modulators, each annotated with 38 ADME-Tox and 32 physicochemical and drug-likeness parameters. Furthermore, each compound is shown with its optimal docking poses, affinity scores, and activity scores, offering a detailed summary.
Protein-arginine deiminase type-4
partner:
Reaxense
upacc:
Q9UM07
UPID:
PADI4_HUMAN
Alternative names:
HL-60 PAD; Peptidylarginine deiminase IV; Protein-arginine deiminase type IV
Alternative UPACC:
Q9UM07; A8K392; B2RBW0; Q5VTZ8; Q70SX4
Background:
Protein-arginine deiminase type-4 (PAD4), also known as Peptidylarginine deiminase IV, plays a pivotal role in the post-translational modification of proteins through the citrullination of arginine residues. This process is crucial for histone code regulation, stem cell maintenance, and the innate immune response, including the formation of neutrophil extracellular traps (NETs) to bind pathogens.
Therapeutic significance:
PAD4's involvement in rheumatoid arthritis, characterized by autoimmune features and joint inflammation, highlights its potential as a therapeutic target. The protein's role in disease pathogenesis, through variants affecting mRNA stability rather than its enzymatic activity, underscores the importance of understanding PAD4's function for developing novel treatments.
