2G60

Structure of anti-FLAG M2 Fab domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 

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This is version 1.3 of the entry. See complete history


Literature

Structure of anti-FLAG M2 Fab domain and its use in the stabilization of engineered membrane proteins.

Roosild, T.P.Castronovo, S.Choe, S.

(2006) Acta Crystallogr Sect F Struct Biol Cryst Commun 62: 835-839

  • DOI: 10.1107/S1744309106029125
  • Primary Citation of Related Structures:  
    2G60

  • PubMed Abstract: 
  • The inherent difficulties of stabilizing detergent-solubilized integral membrane proteins for biophysical or structural analysis demand the development of new methodologies to improve success rates. One proven strategy is the use of antibody fragments to ...

    The inherent difficulties of stabilizing detergent-solubilized integral membrane proteins for biophysical or structural analysis demand the development of new methodologies to improve success rates. One proven strategy is the use of antibody fragments to increase the ;soluble' portion of any membrane protein, but this approach is limited by the difficulties and expense associated with producing monoclonal antibodies to an appropriate exposed epitope on the target protein. Here, the stabilization of a detergent-solubilized K(+) channel protein, KvPae, by engineering a FLAG-binding epitope into a known loop region of the protein and creating a complex with Fab fragments from commercially available anti-FLAG M2 monoclonal antibodies is reported. Although well diffracting crystals of the complex have not yet been obtained, during the course of crystallization trials the structure of the anti-FLAG M2 Fab domain was solved to 1.86 A resolution. This structure, which should aid future structure-determination efforts using this approach by facilitating molecular-replacement phasing, reveals that the binding pocket appears to be specific only for the first four amino acids of the traditional FLAG epitope, namely DYKD. Thus, the use of antibody fragments for improving the stability of target proteins can be rapidly applied to the study of membrane-protein structure by placing the short DKYD motif within a predicted peripheral loop of that protein and utilizing commercially available anti-FLAG M2 antibody fragments.


    Organizational Affiliation

    Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
anti-FLAG M2 Fab light chain L216Mus musculusMutation(s): 0 
Find proteins for Q65ZC0 (Mus musculus)
Explore Q65ZC0 
Go to UniProtKB:  Q65ZC0
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
anti-FLAG M2 Fab heavy chain H215Mus musculusMutation(s): 0 
Find proteins for Q5BJZ2 (Rattus norvegicus)
Explore Q5BJZ2 
Go to UniProtKB:  Q5BJZ2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.36α = 90
b = 133.76β = 90
c = 41.48γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2006-02-23 
  • Released Date: 2006-09-12 
  • Deposition Author(s): Roosild, T.P.

Revision History 

  • Version 1.0: 2006-09-12
    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: 2017-10-18
    Changes: Refinement description