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Protein Structures and Oligomeric States

Enter a protein name, UniProt accession or PDB ID. Name searches ask you to confirm the protein identity before related structures are queried.

Current Protein Identity：P19400 New Search
2PDB entries
2Biological assembly
2chain/assembly records
UNP PDB Protein and construct Assembly Composition class Protein state Molecular copy count PDB declaration Consistency status
P19400 1f32 MAJOR PEPSIN INHIBITOR PI-3 Author chain A Reference sequence 21–169 1 Protein monomer Monomer Protein 1 monomeric （1） Consistent with protein count
P19400 1f34 MAJOR PEPSIN INHIBITOR PI-3 Author chain B Reference sequence 21–169 1 Protein heterocomplex Heteromer Protein 2 dimeric （2） Consistent with protein count

“Homomeric versus heteromeric classification follows protein identity; different constructs of the same UniProt entry still require comparison of reference-sequence ranges, mutations and missing segments. Assemblies marked for review remain visible but are not included in the highest-confidence candidate set.