3LS5

Anti-tetrahydrocannabinol Fab Fragment, Free Form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A structural insight into the molecular recognition of a (-)-Delta9-tetrahydrocannabinol and the development of a sensitive, one-step, homogeneous immunocomplex-based assay for its detection

Niemi, M.H.Turunen, L.Pulli, T.Nevanen, T.K.Hoyhtya, M.Soderlund, H.Rouvinen, J.Takkinen, K.

(2010) J Mol Biol 400: 803-814

  • DOI: 10.1016/j.jmb.2010.05.048
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • (-)-Delta9-tetrahydrocannabinol (THC) is the main psychoactive compound found in cannabis. In this study, an anti-THC Fab fragment, designed T3, was isolated from a display library cloned from the spleen cells of a mouse immunized with a THC-bovine s ...

    (-)-Delta9-tetrahydrocannabinol (THC) is the main psychoactive compound found in cannabis. In this study, an anti-THC Fab fragment, designed T3, was isolated from a display library cloned from the spleen cells of a mouse immunized with a THC-bovine serum albumin conjugate, and the crystal structures of the T3 Fab in its free form and in complex with THC were determined at 1.9 A and 2.0 A resolution, respectively. The THC binding site of the T3 Fab is a narrow cavity: the n-pentyl group of THC protrudes deep into the interface area between the variable domains and the C(10) monoterpene moiety of the hapten is partially exposed to solvent. The metabolites of THC, with modifications in the C(10) monoterpene moiety, 11-nor-9-carboxy-Delta(9)-tetrahydrocannabinol and 11-hydroxy-?(9)-tetrahydrocannabinol, are bound by the T3 Fab with a higher affinity than THC. The crystal structures suggest that Ser52H and Arg53H of the T3 Fab are able to make hydrogen bonds with the metabolites, which leads to an increased binding against these metabolites. By developing a T3 Fab-Delta(9)-THC immunocomplex binding antibody from a naïve antibody phage display library, the specificity of the Delta(9)-THC binding is highly increased, which allows a one-step, homogeneous, fluorescence resonance energy transfer-based sensitive immunoassay, with a detection limit of 20 ng/ml from saliva samples.


    Organizational Affiliation

    Department of Chemistry, University of Eastern Finland, PO Box 111, FIN-80101 Joensuu, Finland.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Light chain of antibody Fab fragmentL215Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Heavy chain of antibody Fab fragmentH219Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.215 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.434α = 90
b = 121.434β = 90
c = 73.499γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-01-22
    Changes: Database references