Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 17.42 kDa 
• Atom Count: 1199 
• Modelled Residue Count: 153 
• Deposited Residue Count: 153 
• Unique protein chains: 2

1P4Q

Solution structure of the CITED2 transactivation domain in complex with the p300 CH1 domain

• DOI: 10.2210/pdb1P4Q/pdb
• BMRB: 5306

• Classification: TRANSCRIPTION/TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2003-04-23 Released: 2003-07-01 
• Deposition Author(s): Freedman, S.J., Sun, Z.-Y.J., Kung, A.L., France, D.S., Wagner, G., Eck, M.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 25 
• Conformers Submitted: 17 
• Selection Criteria: structures with the lowest energy 

Literature

Structural basis for negative regulation of hypoxia-inducible factor-1alpha by CITED2.

Freedman, S.J., Sun, Z.Y., Kung, A.L., France, D.S., Wagner, G., Eck, M.J.

(2003) Nat Struct Biol 10: 504-512

• PubMed: 12778114 
• DOI: 10.1038/nsb936
• Primary Citation of Related Structures:  
  1P4Q


• PubMed Abstract: 
  

Expression of hypoxia-responsive genes is mediated by the heterodimeric transcription factor hypoxia-inducible factor-1 (HIF-1) in complex with the p300/CREB-binding protein (p300/CBP) transcriptional coactivator. The protein CITED2, which binds p300/CBP, is thought to be a negative regulator of HIF-1 transactivation. We show that the CITED2 transactivation domain (TAD) disrupts a complex of the HIF-1alpha C-terminal TAD (C-TAD) and the cysteine-histidine-rich 1 (CH1) domain of p300/CBP by binding CH1 with high affinity. The high-resolution solution structure of the CITED2 TAD-p300 CH1 complex shows that the CITED2 TAD, like the HIF-1alpha C-TAD, folds on a helical, Zn2+-containing CH1 scaffold. The CITED2 TAD binds a different, more extensive surface of CH1 than does the HIF-1alpha C-TAD. However, a conserved 'LPXL' sequence motif in CITED2 and HIF-1alpha interacts with an overlapping binding site on CH1. Mutation of the LPEL sequence in full-length CITED2 abolishes p300 binding in vivo. These findings reveal that CITED2 regulates HIF-1 by competing for a hot spot on the p300 CH1 domain.

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Related Citations: 

• Structural basis for recruitment of CBP/p300 by hypoxia-inducible factor-1alpha
  (2002) Proc Natl Acad Sci U S A 99: 5367

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Organizational Affiliation: 

Division of Hemostasis and Thrombosis, Beth Israel Deaconess Medical Center, 41 Avenue Louis Pasteur, Boston, Massachusetts 02115, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cbp/p300-interacting transactivator 2	A	52	Homo sapiens	Mutation(s): 0  Gene Names: CITED2 OR MRG1, CITED2, MRG1
UniProt & NIH Common Fund Data Resources
Find proteins for Q99967 (Homo sapiens) Explore Q99967  Go to UniProtKB:  Q99967
PHAROS:  Q99967 GTEx:  ENSG00000164442

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
E1A-associated protein p300	B	101	Homo sapiens	Mutation(s): 0  Gene Names: EP300 OR P300, EP300, P300 EC: 2.3.1.48 (PDB Primary Data), 2.3.1 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q09472 (Homo sapiens) Explore Q09472  Go to UniProtKB:  Q09472
PHAROS:  Q09472 GTEx:  ENSG00000100393

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth B], D [auth B], E [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 25 
• Conformers Submitted: 17 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 1P4Q Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-04-23 
• Released Date: 2003-07-01 
Deposition Author(s): Freedman, S.J., Sun, Z.-Y.J., Kung, A.L., France, D.S., Wagner, G., Eck, M.J.

Revision History  

• Version 1.0: 2003-07-01
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-02-01
  Changes: Structure summary