2AP2

SINGLE CHAIN FV OF C219 IN COMPLEX WITH SYNTHETIC EPITOPE PEPTIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.221 

wwPDB Validation 3D Report Full Report


This is version 2.1 of the entry. See complete history

Literature

Antibody C219 recognizes an alpha-helical epitope on P-glycoprotein.

van Den Elsen, J.M.Kuntz, D.A.Hoedemaeker, F.J.Rose, D.R.

(1999) Proc.Natl.Acad.Sci.USA 96: 13679-13684

  • DOI: 10.1073/pnas.96.24.13679

  • PubMed Abstract: 
  • The ABC transporter, P-glycoprotein, is an integral membrane protein that mediates the ATP-driven efflux of drugs from multidrug-resistant cancer and HIV-infected cells. Anti-P-glycoprotein antibody C219 binds to both of the ATP-binding regions of P- ...

    The ABC transporter, P-glycoprotein, is an integral membrane protein that mediates the ATP-driven efflux of drugs from multidrug-resistant cancer and HIV-infected cells. Anti-P-glycoprotein antibody C219 binds to both of the ATP-binding regions of P-glycoprotein and has been shown to inhibit its ATPase activity and drug binding capacity. C219 has been widely used in a clinical setting as a tumor marker, but recent observations of cross-reactivity with other proteins, including the c-erbB2 protein in breast cancer cells, impose potential limitations in detecting P-glycoprotein. We have determined the crystal structure at a resolution of 2.4 A of the variable fragment of C219 in complex with an epitope peptide derived from the nucleotide binding domain of P-glycoprotein. The 14-residue peptide adopts an amphipathic alpha-helical conformation, a secondary structure not previously observed in structures of antibody-peptide complexes. Together with available biochemical data, the crystal structure of the C219-peptide complex indicates the molecular basis of the cross-reactivity of C219 with non-multidrug resistance-associated proteins. Alignment of the C219 epitope with the recent crystal structure of the ATP-binding subunit of histidine permease suggests a structural basis for the inhibition of the ATP and drug binding capacity of P-glycoprotein by C219. The results provide a rationale for the development of C219 mutants with improved specificity and affinity that could be useful in antibody-based P-glycoprotein detection and therapy in multidrug resistant cancers.


    Related Citations: 
    • A single chain Fv fragment of P-glycoprotein-specific monoclonal antibody C219. Design, expression, and crystal structure at 2.4 A resolution.
      Hoedemaeker, F.J.,Signorelli, T.,Johns, K.,Kuntz, D.A.,Rose, D.R.
      (1997) J.Biol.Chem. 272: 29784


    Organizational Affiliation

    Ontario Cancer Institute, Department of Medical Biophysics, University of Toronto, 610 University Avenue, Toronto M5G 2M9, Ontario, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SINGLE CHAIN FV
A, C
271N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
P-GLYCOPROTEIN
P, Q
14Cricetulus griseusMutation(s): 0 
Gene Names: ABCB1 (PGP1, PGY1)
Find proteins for P21448 (Cricetulus griseus)
Go to Gene View: ABCB1
Go to UniProtKB:  P21448
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 68.792α = 90.00
b = 82.659β = 90.00
c = 93.978γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-11-24
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 2.0: 2018-03-07
    Type: Advisory, Atomic model, Data collection, Database references, Derived calculations, Experimental preparation, Polymer sequence, Source and taxonomy, Structure summary
  • Version 2.1: 2019-11-13
    Type: Database references, Derived calculations