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Gene and Protein Information ![]()  | 
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| Species | TM | AA | Chromosomal Location | Gene Symbol | Gene Name | Reference | 
| Human | 4 | 254 | 2p23.1 | SRD5A2 | steroid 5 alpha-reductase 2 | |
| Mouse | 4 | 254 | 17 E2 | Srd5a2 | steroid 5 alpha-reductase 2 | |
| Rat | 4 | 254 | 6q14 | Srd5a2 | steroid 5 alpha-reductase 2 | |
Previous and Unofficial Names ![]()  | 
                                
| 3-oxo-5-alpha-steroid 4-dehydrogenase 2 | steroid-5-alpha-reductase, alpha polypeptide 2 (3-oxo-5 alpha-steroid delta 4-dehydrogenase alpha 2) | 
Database Links ![]()  | 
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| Alphafold | P31213 (Hs), Q99N99 (Mm), P31214 (Rn) | 
| BRENDA | 1.3.99.5 | 
| ChEMBL Target | CHEMBL1856 (Hs), CHEMBL5099 (Rn) | 
| DrugBank Target | P31213 (Hs) | 
| Ensembl Gene | ENSG00000277893 (Hs), ENSMUSG00000038541 (Mm), ENSRNOG00000027042 (Rn) | 
| Entrez Gene | 6716 (Hs), 94224 (Mm), 64677 (Rn) | 
| Human Protein Atlas | ENSG00000277893 (Hs) | 
| KEGG Enzyme | 1.3.99.5 | 
| KEGG Gene | hsa:6716 (Hs), mmu:94224 (Mm), rno:64677 (Rn) | 
| OMIM | 607306 (Hs) | 
| Orphanet | ORPHA119860 (Hs) | 
| Pharos | P31213 (Hs) | 
| RefSeq Nucleotide | NM_000348 (Hs), NM_053188 (Mm), NM_022711 (Rn) | 
| RefSeq Protein | NP_000339 (Hs), NP_444418 (Mm), NP_073202 (Rn) | 
| UniProtKB | P31213 (Hs), Q99N99 (Mm), P31214 (Rn) | 
| Wikipedia | SRD5A2 (Hs) | 
Enzyme Reaction ![]()  | 
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                            Download all structure-activity data for this target as a CSV file 
                        
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| Key to terms and symbols | View all chemical structures | Click column headers to sort | |||||||||||||||||||||||||||||||||||||||||||||||||
                                            
                                            
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Clinically-Relevant Mutations and Pathophysiology  
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1.-.-.- Oxidoreductases: steroid 5 alpha-reductase 2. Last modified on 30/03/2016. Accessed on 04/11/2025. IUPHAR/BPS Guide to PHARMACOLOGY, https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=2633.