5H9K

Crystal of a leukotriene-binding salivary lipocalin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.352 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and Ligand-Binding Mechanism of a Cysteinyl Leukotriene-Binding Protein from a Blood-Feeding Disease Vector.

Jablonka, W.Pham, V.Nardone, G.Gittis, A.Silva-Cardoso, L.Atella, G.C.Ribeiro, J.M.Andersen, J.F.

(2016) Acs Chem.Biol. 11: 1934-1944

  • DOI: 10.1021/acschembio.6b00032
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Blood-feeding disease vectors mitigate the negative effects of hemostasis and inflammation through the binding of small-molecule agonists of these processes by salivary proteins. In this study, a lipocalin protein family member (LTBP1) from the saliv ...

    Blood-feeding disease vectors mitigate the negative effects of hemostasis and inflammation through the binding of small-molecule agonists of these processes by salivary proteins. In this study, a lipocalin protein family member (LTBP1) from the saliva of Rhodnius prolixus, a vector of the pathogen Trypanosoma cruzi, is shown to sequester cysteinyl leukotrienes during feeding to inhibit immediate inflammatory responses. Calorimetric binding experiments showed that LTBP1 binds leukotrienes C4 (LTC4), D4 (LTD4), and E4 (LTE4) but not biogenic amines, adenosine diphosphate, or other eicosanoid compounds. Crystal structures of ligand-free LTBP1 and its complexes with LTC4 and LTD4 reveal a conformational change during binding that brings Tyr114 into close contact with the ligand. LTC4 is cleaved in the complex, leaving free glutathione and a C20 fatty acid. Chromatographic analysis of bound ligands showed only intact LTC4, suggesting that cleavage could be radiation-mediated.


    Organizational Affiliation

    Laboratory of Malaria and Vector Research, NIAID, National Institutes of Health , Rockville, Maryland 20852, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lipocalin AI-4
A
156Rhodnius prolixusMutation(s): 0 
Find proteins for Q7YT09 (Rhodnius prolixus)
Go to UniProtKB:  Q7YT09
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.352 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.160 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 35.130α = 90.00
b = 58.700β = 111.78
c = 35.480γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-05-11
    Type: Initial release
  • Version 1.1: 2016-07-27
    Type: Database references