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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：Q83BB9 New Search
3PDB entries
3Biological assembly
3chain/assembly records
UNP PDB Protein and construct Assembly Composition class Protein state Molecular copy count PDB declaration Consistency status
Q83BB9 9t0z Small ribosomal subunit protein bS21 Author chain U Reference sequence 1–74 1 Protein–RNA Heteromer Protein 21 RNA 1 22-meric （22） Consistent with all polymers
Q83BB9 9t61 Small ribosomal subunit protein bS21 Author chain U Reference sequence 1–74 1 Protein–RNA Heteromer Protein 20 RNA 2 22-meric （22） Consistent with all polymers
Q83BB9 9tze Small ribosomal subunit protein bS21 Author chain U Reference sequence 1–74 1 Protein–RNA Heteromer Protein 50 RNA 3 53-meric （53） Consistent with all polymers

“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.