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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：P61999 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
P61999 1ais PROTEIN (TRANSCRIPTION INITIATION FACTOR IIB) Author chain B Reference sequence 101–300 1 Protein–DNA Heteromer Protein 2 DNA 2 tetrameric （4） Consistent with all polymers
P61999 1d3u TRANSCRIPTION INITIATION FACTOR IIB Author chain B Reference sequence 61–261 1 Protein–DNA Heteromer Protein 2 DNA 2 tetrameric （4） 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.