Biological Assembly 1  

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

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.85 kDa 
• Atom Count: 344 
• Modelled Residue Count: 38 
• Deposited Residue Count: 38 
• Unique protein chains: 1

2HN8

Structural characterization and oligomerization of PB1-F2, a pro-apoptotic influenza A virus protein

• PDB DOI: 10.2210/pdb2HN8/pdb
• BMRB: 7258

• Classification: VIRAL PROTEIN
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 2006-07-12 Released: 2006-11-07 
• Deposition Author(s): Bruns, K., Studtrucker, N., Sharma, A., Fossen, T., Mitzner, D., Eissmann, A., Tessmer, U., Roder, R., Henklein, P., Wray, V., Schubert, U.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations 

Literature

Structural characterization and oligomerization of PB1-F2, a pro-apoptotic influenza A virus protein.

Bruns, K., Studtrucker, N., Sharma, A., Fossen, T., Mitzner, D., Eissmann, A., Tessmer, U., Roder, R., Henklein, P., Wray, V., Schubert, U.

(2007) J Biol Chem 282: 353-363

• PubMed: 17052982 
• DOI: 10.1074/jbc.M606494200
• Primary Citation of Related Structures:  
  2HN8


• PubMed Abstract: 
  

Recently, a novel 87-amino acid influenza A virus protein with proapoptotic properties, PB1-F2, has been reported that originates from an alternative reading frame in the PB1 polymerase gene and is encoded in most known human influenza A virus isolates. Here we characterize the molecular structure of a biologically active synthetic version of the protein (sPB1-F2). Western blot analysis, chemical cross-linking, and NMR spectroscopy afforded direct evidence of the inherent tendency of sPB1-F2 to undergo oligomerization mediated by two distinct domains located in the N and C termini, respectively. CD and (1)H NMR spectroscopic analyses indicate that the stability of structured regions in the molecule clearly depends upon the hydrophobicity of the solvent. In aqueous solutions, the behavior of sPB1-F2 is typical of a largely random coil peptide that, however, adopts alpha-helical structure upon the addition of membrane mimetics. (1)H NMR analysis of three overlapping peptides afforded, for the first time, direct experimental evidence of the presence of a C-terminal region with strong alpha-helical propensity comprising amino acid residues Ile(55)-Lys(85) connected via an essentially random coil structure to a much weaker helix-like region, located in the N terminus between residues Trp(9) and Lys(20). The C-terminal helix is not a true amphipathic helix and is more compact than previously predicted. It corresponds to a positively charged region previously shown to include the mitochondrial targeting sequence of PB1-F2. The consequences of the strong oligomerization and helical propensities of the molecule are discussed and used to formulate a hypothetical model of its interaction with the mitochondrial membrane.

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Organizational Affiliation: 

Institute of Clinical and Molecular Virology, University of Erlangen-Nürnberg, Erlangen D-91054, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein PB1-F2	A	38	N/A	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for P0C0U1 (Influenza A virus (strain A/Puerto Rico/8/1934 H1N1)) Explore P0C0U1  Go to UniProtKB:  P0C0U1

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations 
• OLDERADO: 2HN8 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-07-12 
• Released Date: 2006-11-07 
Deposition Author(s): Bruns, K., Studtrucker, N., Sharma, A., Fossen, T., Mitzner, D., Eissmann, A., Tessmer, U., Roder, R., Henklein, P., Wray, V., Schubert, U.

Revision History  

• Version 1.0: 2006-11-07
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-09
  Changes: Database references, Derived calculations