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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：Q9Z4N9 New Search
2PDB entries
5Biological assembly
5chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics

Difference tags compare only the current result set; every original PDB and assembly record remains separate.

Related-Structure Differences

Each row represents one biological assembly in one PDB entry; multiple monomers of the same protein are listed separately.

PDB Entry Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Experimental Method Experimental Conditions Structure Quality
1CQY STARCH BINDING DOMAIN OF BACILLUS CEREUS BETA-AMYLASE Deposited 1999-08-12 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 448–546（99 aa） Fragment：STARCH-BINDING DOMAIN
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.6；291 K；AMMONIUM SULFATE, SODIUM ACETATE, pH 4.6, VAPOR DIFFUSION, HANGING DROP, temperature 18K
Resolution 1.95 Å R-free 0.225
5BCA BETA-AMYLASE FROM BACILLUS CEREUS VAR. MYCOIDES Deposited 1999-03-12 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 31–546（516 aa）
Not recorded CA CALCIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 9；pH 9.0
Resolution 2.20 Å R-free 0.240
5BCA BETA-AMYLASE FROM BACILLUS CEREUS VAR. MYCOIDES Deposited 1999-03-12 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 31–546（516 aa）
Not recorded CA CALCIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 9；pH 9.0
Resolution 2.20 Å R-free 0.240
5BCA BETA-AMYLASE FROM BACILLUS CEREUS VAR. MYCOIDES Deposited 1999-03-12 Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain C 31–546（516 aa）
Not recorded CA CALCIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 9；pH 9.0
Resolution 2.20 Å R-free 0.240
5BCA BETA-AMYLASE FROM BACILLUS CEREUS VAR. MYCOIDES Deposited 1999-03-12 Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain D 31–546（516 aa）
Not recorded CA CALCIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 9；pH 9.0
Resolution 2.20 Å R-free 0.240

This page presents structural evidence recorded in PDB/mmCIF.“No recorded non-water small molecule” does not prove that the experimental sample was ligand-free; experimental conditions belong to the PDB experiment, while ligands and copy counts are shown for each biological assembly.