4RWB

Racemic influenza M2-TM crystallized from monoolein lipidic cubic phase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.281 
  • R-Value Observed: 0.282 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

High-resolution structures of a heterochiral coiled coil.

Mortenson, D.E.Steinkruger, J.D.Kreitler, D.F.Perroni, D.V.Sorenson, G.P.Huang, L.Mittal, R.Yun, H.G.Travis, B.R.Mahanthappa, M.K.Forest, K.T.Gellman, S.H.

(2015) Proc Natl Acad Sci U S A 112: 13144-13149

  • DOI: 10.1073/pnas.1507918112
  • Primary Citation of Related Structures:  
    4RWB, 4RWC

  • PubMed Abstract: 
  • Interactions between polypeptide chains containing amino acid residues with opposite absolute configurations have long been a source of interest and speculation, but there is very little structural information for such heterochiral associations. The need to address this lacuna has grown in recent years because of increasing interest in the use of peptides generated from d amino acids (d peptides) as specific ligands for natural proteins, e ...

    Interactions between polypeptide chains containing amino acid residues with opposite absolute configurations have long been a source of interest and speculation, but there is very little structural information for such heterochiral associations. The need to address this lacuna has grown in recent years because of increasing interest in the use of peptides generated from d amino acids (d peptides) as specific ligands for natural proteins, e.g., to inhibit deleterious protein-protein interactions. Coiled-coil interactions, between or among α-helices, represent the most common tertiary and quaternary packing motif in proteins. Heterochiral coiled-coil interactions were predicted over 50 years ago by Crick, and limited experimental data obtained in solution suggest that such interactions can indeed occur. To address the dearth of atomic-level structural characterization of heterochiral helix pairings, we report two independent crystal structures that elucidate coiled-coil packing between l- and d-peptide helices. Both structures resulted from racemic crystallization of a peptide corresponding to the transmembrane segment of the influenza M2 protein. Networks of canonical knobs-into-holes side-chain packing interactions are observed at each helical interface. However, the underlying patterns for these heterochiral coiled coils seem to deviate from the heptad sequence repeat that is characteristic of most homochiral analogs, with an apparent preference for a hendecad repeat pattern.


    Organizational Affiliation

    Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706; forest@bact.wisc.edu gellman@chem.wisc.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Matrix protein 2A, B24Influenza A virus (A/Hong Kong/156/97(H5N1))Mutation(s): 3 
Gene Names: M
Find proteins for O70632 (Influenza A virus (strain A/Hong Kong/156/1997 H5N1 genotype Gs/Gd))
Explore O70632 
Go to UniProtKB:  O70632
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MPG
Query on MPG

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], E [auth B][(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate
C21 H40 O4
JPJYKWFFJCWMPK-GDCKJWNLSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.281 
  • R-Value Observed: 0.282 
  • Space Group: P 1 21/c 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.93α = 90
b = 41.23β = 95.68
c = 27.93γ = 90
Software Package:
Software NamePurpose
XPREPdata reduction
REFMACrefinement
PDB_EXTRACTdata extraction
EMBLdata collection
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Database references
  • Version 1.2: 2016-06-01
    Changes: Non-polymer description