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                                                                Synonyms: ATYR-1923 | ATYR1923 | KRP-R120
                                 
                                                         
                            
                            
                            
                                Compound class: 
                                                            Peptide
                                 
                                
                                    
                                        Comment: Efzofitimod (ATYR1923) is a Fc fusion protein [1]. The C-terminal 59 amino acids corresponds to the active N-terminal domain of histidyl-tRNA synthetase (HARS), an extracellular non-catalytic isoform that is upregulated by inflammatory cytokine stimulation in the lung. The IgG1 Fc domain extends the peptide's circulating half-life. The HARS domain binds selectively to the cell surface receptor neuropilin 2 (NRP2; O60462, which is an immunomodulatory protein and molecular target for inflammatory diseases [5]. In the airways, NRP2 plays an important role in activation of myeloid cells and their recruitment to inflammatory sites [3]. Efzofitimod was developed as a clinical candidate immunotherpy with potential for immune-mediated fibrotic lung conditions.
                                    
                                 
                            
                            
                          
                                
                                    
                                
                          
                                   
                                   
                                  
                                    
                                    
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Classification ![]()  | 
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| Compound class | Peptide | 
International Nonproprietary Names ![]()  | 
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| INN number | INN | 
| 12027 | efzofitimod | 
Synonyms ![]()  | 
                                                        
| ATYR-1923 | ATYR1923 | KRP-R120 | 
Database Links ![]()  | 
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| GtoPdb PubChem SID | 491299981 | 
| Search PubMed clinical trials | efzofitimod | 
| Search PubMed titles | efzofitimod | 
| Search PubMed titles/abstracts | efzofitimod |