Macromolecule Content

• Total Structure Weight: 16.62 kDa 
• Atom Count: 1141 
• Modelled Residue Count: 146 
• Deposited Residue Count: 146 
• Unique protein chains: 2

1L8C

STRUCTURAL BASIS FOR HIF-1ALPHA/CBP RECOGNITION IN THE CELLULAR HYPOXIC RESPONSE

• DOI: 10.2210/pdb1L8C/pdb
• BMRB: 5327

• Classification: GENE REGULATION
• Organism(s): Mus musculus, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-03-19 Released: 2002-04-10 
• Deposition Author(s): Dames, S.A., Martinez-Yamout, M., De Guzman, R.N., Dyson, H.J., Wright, P.E.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations, structures with the lowest energy 

Literature

Structural basis for Hif-1 alpha /CBP recognition in the cellular hypoxic response.

Dames, S.A., Martinez-Yamout, M., De Guzman, R.N., Dyson, H.J., Wright, P.E.

(2002) Proc Natl Acad Sci U S A 99: 5271-5276

• PubMed: 11959977 
• DOI: 10.1073/pnas.082121399
• Primary Citation of Related Structures:  
  1L8C


• PubMed Abstract: 
  

The cellular response to low tissue oxygen concentrations is mediated by the hypoxia-inducible transcription factor HIF-1. Under hypoxic conditions, HIF-1 activates transcription of critical adaptive genes by recruitment of the general coactivators CBP/p300 through interactions with its alpha-subunit (Hif-1 alpha). Disruption of the Hif-1 alpha/p300 interaction has been linked to attenuation of tumor growth. To delineate the structural basis for this interaction, we have determined the solution structure of the complex between the carboxy-terminal activation domain (CAD) of Hif-1 alpha and the zinc-binding TAZ1 (CH1) motif of cyclic-AMP response element binding protein (CREB) binding protein (CBP). Despite the overall similarity of the TAZ1 structure to that of the TAZ2 (part of the CH3) domain of CBP, differences occur in the packing of helices that can account for differences in specificity. The unbound CAD is intrinsically disordered and remains relatively extended upon binding, wrapping almost entirely around the TAZ1 domain in a groove through much of its surface. Three short helices are formed upon binding, stabilized by intermolecular interactions. The Asn-803 side chain, which functions as a hypoxic switch, is located on the second of these helices and is buried in the molecular interface. The third helix of the Hif-1 alpha CAD docks in a deep hydrophobic groove in TAZ1, providing extensive intermolecular hydrophobic interactions that contribute to the stability of the complex. The structure of this complex provides new insights into the mechanism through which Hif-1 alpha recruits CBP/p300 in response to hypoxia.

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Organizational Affiliation: 

Department of Molecular Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CREB-binding protein	A	95	Mus musculus	Mutation(s): 0  Gene Names: Crebbp, Cbp EC: 2.3.1.48 (UniProt), 2.3.1 (UniProt)
UniProt
Find proteins for P45481 (Mus musculus) Explore P45481  Go to UniProtKB:  P45481

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Hypoxia-inducible factor 1 alpha	B	51	Homo sapiens	Mutation(s): 0  Gene Names: HIF1A, BHLHE78, MOP1, PASD8
UniProt & NIH Common Fund Data Resources
Find proteins for Q16665 (Homo sapiens) Explore Q16665  Go to UniProtKB:  Q16665
PHAROS:  Q16665 GTEx:  ENSG00000100644

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations, structures with the lowest energy 
• OLDERADO: 1L8C Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-03-19 
• Released Date: 2002-04-10 
Deposition Author(s): Dames, S.A., Martinez-Yamout, M., De Guzman, R.N., Dyson, H.J., Wright, P.E.

Revision History  

• Version 1.0: 2002-04-10
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance