2YK1

Structure of human anti-nicotine Fab fragment in complex with nicotine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Different Binding Modes of Free and Carrier-Protein-Coupled Nicotine in a Human Monoclonal Antibody.

Tars, K.Kotelovica, S.Lipowsky, G.Bauer, M.Beerli, R.Bachmann, M.Maurer, P.

(2012) J Mol Biol 415: 118

  • DOI: https://doi.org/10.1016/j.jmb.2011.10.042
  • Primary Citation of Related Structures:  
    2YK1, 2YKL

  • PubMed Abstract: 

    Nicotine is the principal addictive component of tobacco. Blocking its passage from the lung to the brain with nicotine-specific antibodies is a promising approach for the treatment of smoking addiction. We have determined the crystal structure of nicotine bound to the Fab fragment of a fully human monoclonal antibody (mAb) at 1.85 Å resolution. Nicotine is almost completely (>99%) buried in the interface between the variable domains of heavy and light chains. The high affinity of the mAb is the result of a charge-charge interaction, a hydrogen bond, and several hydrophobic contacts. Additionally, similarly to nicotinic acetylcholine receptors in the brain, two cation-π interactions are present between the pyrrolidine charge and nearby aromatic side chains. The selectivity of the mAb for nicotine versus cotinine, which is the major metabolite of nicotine and differs in only one oxygen atom, is caused by steric constraints in the binding site. The mAb was isolated from B cells of an individual immunized with a nicotine-carrier protein conjugate vaccine. Surprisingly, the nicotine was bound to the Fab fragment in an orientation that was not compatible with binding to the nicotine-carrier protein conjugate. The structure of the Fab fragment in complex with the nicotine-linker derivative that was used for the production of the conjugate vaccine revealed a similar position of the pyridine ring of the nicotine moiety, but the pyrrolidine ring was rotated by about 180°. This allowed the linker part to reach to the Fab surface while high-affinity interactions with the nicotine moiety were maintained.


  • Organizational Affiliation

    Biomedical Research and Study Center, Ratsupites 1, Riga LV 1067, Latvia. kaspars@biomed.lu.lv


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FAB FRAGMENT, HEAVY CHAINA [auth H]211Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
FAB FRAGMENT, LIGHT CHAINB [auth L]216Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NCT
Query on NCT

Download Ideal Coordinates CCD File 
C [auth H](S)-3-(1-METHYLPYRROLIDIN-2-YL)PYRIDINE
C10 H14 N2
SNICXCGAKADSCV-JTQLQIEISA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
NCT PDBBind:  2YK1 Kd: 7.4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.11α = 90
b = 78.87β = 116.55
c = 75.47γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-16
    Type: Initial release
  • Version 1.1: 2012-01-18
    Changes: Other
  • Version 1.2: 2019-04-03
    Changes: Data collection, Other, Source and taxonomy
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description, Structure summary
  • Version 1.5: 2024-10-16
    Changes: Structure summary