1HBX image
Deposition Date 2001-04-20
Release Date 2001-06-27
Last Version Date 2023-12-13
Entry Detail
PDB ID:
1HBX
Keywords:
GENE REGULATION
Title:
Ternary Complex of SAP-1 and SRF with specific SRE DNA
Biological Source:
Source Organism:
HOMO SAPIENS (Taxon ID: 9606)
Host Organism:
ESCHERICHIA COLI
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.15 Å
R-Value Free:
0.28
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 21 21 2
1HBX validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:SERUM RESPONSE FACTOR
Gene (Uniprot):SRF
Chain IDs:A, B, D, E
Chain Length:92
Number of Molecules:4
Biological Source:HOMO SAPIENS
UniProt ID:P11831 Pfam ID:PF00319
Polymer Type:polydeoxyribonucleotide
Molecule:5'-D(*GP*AP*TP*GP*GP*CP*CP*TP*AP*AP*TP*TP*AP* GP*GP*AP*CP*TP*TP*CP*CP*GP*GP*TP*G)-3'
Chain IDs:C, F
Chain Length:26
Number of Molecules:2
Biological Source:HOMO SAPIENS
Protein Blast
Polymer Type:polypeptide(L)
Molecule:ETS-DOMAIN PROTEIN ELK-4
Gene (Uniprot):ELK4
Chain IDs:G, H
Chain Length:157
Number of Molecules:2
Biological Source:HOMO SAPIENS
UniProt ID:P28324 Pfam ID:PF00178
Polymer Type:polydeoxyribonucleotide
Molecule:5'-D(*CP*AP*CP*AP*CP*CP*GP*GP*AP*AP*GP*TP*CP* CP*TP*AP*AP*TP*TP*AP*GP*GP*CP*CP*AP*T)-3'
Chain IDs:I (auth: W), J (auth: X)
Chain Length:26
Number of Molecules:2
Biological Source:HOMO SAPIENS
Ligand Molecules
NA
Primary Citation
The B-Box Dominates Sap-1/Srf Interactions in the Structure of the Ternary Complex
Embo J. 20 3018 ? (2001)
PMID: 11406578 DOI: 10.1093/EMBOJ/20.12.3018

Abstact

The serum response element (SRE) is found in several immediate-early gene promoters. This DNA sequence is necessary and sufficient for rapid transcriptional induction of the human c-fos proto-oncogene in response to stimuli external to the cell. Full activation of the SRE requires the cooperative binding of a ternary complex factor (TCF) and serum response factor (SRF) to their specific DNA sites. The X-ray structure of the human SAP-1-SRF-SRE DNA ternary complex was determined (Protein Data Bank code 1hbx). It shows SAP-1 TCF bound to SRF through interactions between the SAP-1 B-box and SRF MADS domain in addition to contacts between their respective DNA-binding motifs. The SAP-1 B-box is part of a flexible linker of which 21 amino acids become ordered upon ternary complex formation. Comparison with a similar region from the yeast MATalpha2-MCM1-DNA complex suggests a common binding motif through which MADS-box proteins may interact with additional factors such as Fli-1.

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Protein

Chemical

Disease

Primary Citation of related structures
1BC7
1BC8
1SRS