Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 26.00 kDa 
• Atom Count: 1336 
• Modelled Residue Count: 170 
• Deposited Residue Count: 231 
• Unique protein chains: 2

1IBX

NMR STRUCTURE OF DFF40 AND DFF45 N-TERMINAL DOMAIN COMPLEX

• PDB DOI: 10.2210/pdb1IBX/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Homo sapiens, Streptococcus sp.
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2001-03-29 Released: 2001-05-02 
• Deposition Author(s): Zhou, P., Lugovskoy, A.A., McCarty, J.S., Li, P., Wagner, G.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 30 
• Conformers Submitted: 10 
• Selection Criteria: structures with the least restraint violations 

Literature

Solution structure of DFF40 and DFF45 N-terminal domain complex and mutual chaperone activity of DFF40 and DFF45.

Zhou, P., Lugovskoy, A.A., McCarty, J.S., Li, P., Wagner, G.

(2001) Proc Natl Acad Sci U S A 98: 6051-6055

• PubMed: 11371636 
• DOI: 10.1073/pnas.111145098
• Primary Citation of Related Structures:  
  1IBX


• PubMed Abstract: 
  

Apoptotic DNA fragmentation is mediated by a caspase-activated DNA fragmentation factor (DFF)40. Expression and folding of DFF40 require the presence of DFF45, which also acts as a nuclease inhibitor before DFF40 activation by execution caspases. The N-terminal domains (NTDs) of both proteins are homologous, and their interaction plays a key role in the proper functioning of this two-component system. Here we report that the NTD of DFF45 alone is unstructured in solution, and its folding is induced upon binding to DFF40 NTD. Therefore, folding of both proteins regulates the formation of the DFF40/DFF45 complex. The solution structure of the heterodimeric complex between NTDs of DFF40 and DFF45 reported here shows that the mutual chaperoning includes the formation of an extensive network of intermolecular interactions that bury a hydrophobic cluster inside the interface, surrounded by intermolecular salt bridges.

---

Organizational Affiliation: 

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA FRAGMENTATION FACTOR 40	A	86	Homo sapiens	Mutation(s): 0  Gene Names: DFF40, DFFB, CAD, DFF2 EC: 3
UniProt & NIH Common Fund Data Resources
Find proteins for O76075 (Homo sapiens) Explore O76075  Go to UniProtKB:  O76075
PHAROS:  O76075

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CHIMERA OF IGG BINDING PROTEIN G AND DNA FRAGMENTATION FACTOR 45	B	145	Streptococcus sp., Homo sapiens This entity is chimeric	Mutation(s): 1  Gene Names: DFF45
UniProt & NIH Common Fund Data Resources
Find proteins for O00273 (Homo sapiens) Explore O00273  Go to UniProtKB:  O00273
PHAROS:  O00273

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 30 
• Conformers Submitted: 10 
• Selection Criteria: structures with the least restraint violations 
• OLDERADO: 1IBX Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-03-29 
• Released Date: 2001-05-02 
Deposition Author(s): Zhou, P., Lugovskoy, A.A., McCarty, J.S., Li, P., Wagner, G.

Revision History  

• Version 1.0: 2001-05-02
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-10-27
  Changes: Data collection, Database references, Derived calculations