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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：Q2A3F5 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
Q2A3F5 28nt Small ribosomal subunit protein bS21B Author chain u Reference sequence 1–65 1 Protein–RNA Heteromer Protein 46 RNA 3 49-meric （49） Consistent with all polymers
Q2A3F5 9sda Small ribosomal subunit protein bS21B Author chain u Reference sequence 1–65 1 Protein–RNA Heteromer Protein 50 RNA 3 53-meric （53） Consistent with all polymers
Q2A3F5 9t6h Small ribosomal subunit protein bS21B Author chain u Reference sequence 1–65 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.