3Q6K

Salivary protein from Lutzomyia longipalpis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and function of a "yellow" protein from saliva of the sand fly Lutzomyia longipalpis that confers protective immunity against Leishmania major infection.

Xu, X.Oliveira, F.Chang, B.W.Collin, N.Gomes, R.Teixeira, C.Reynoso, D.My Pham, V.Elnaiem, D.E.Kamhawi, S.Ribeiro, J.M.Valenzuela, J.G.Andersen, J.F.

(2011) J.Biol.Chem. 286: 32383-32393

  • DOI: 10.1074/jbc.M111.268904
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • LJM11, an abundant salivary protein from the sand fly Lutzomyia longipalpis, belongs to the insect "yellow" family of proteins. In this study, we immunized mice with 17 plasmids encoding L. longiplapis salivary proteins and demonstrated that LJM11 co ...

    LJM11, an abundant salivary protein from the sand fly Lutzomyia longipalpis, belongs to the insect "yellow" family of proteins. In this study, we immunized mice with 17 plasmids encoding L. longiplapis salivary proteins and demonstrated that LJM11 confers protective immunity against Leishmania major infection. This protection correlates with a strong induction of a delayed type hypersensitivity (DTH) response following exposure to L. longipalpis saliva. Additionally, splenocytes of exposed mice produce IFN-γ upon stimulation with LJM11, demonstrating the systemic induction of Th1 immunity by this protein. In contrast to LJM11, LJM111, another yellow protein from L. longipalpis saliva, does not produce a DTH response in these mice, suggesting that structural or functional features specific to LJM11 are important for the induction of a robust DTH response. To examine these features, we used calorimetric analysis to probe a possible ligand binding function for the salivary yellow proteins. LJM11, LJM111, and LJM17 all acted as high affinity binders of prohemostatic and proinflammatory biogenic amines, particularly serotonin, catecholamines, and histamine. We also determined the crystal structure of LJM11, revealing a six-bladed β-propeller fold with a single ligand binding pocket located in the central part of the propeller structure on one face of the molecule. A hypothetical model of LJM11 suggests a positive electrostatic potential on the face containing entry to the ligand binding pocket, whereas LJM111 is negative to neutral over its entire surface. This may be the reason for differences in antigenicity between the two proteins.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
43.2 kDa salivary protein
A, B
381Lutzomyia longipalpisMutation(s): 0 
Find proteins for Q5WPU9 (Lutzomyia longipalpis)
Go to UniProtKB:  Q5WPU9
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A, B
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
SRO
Query on SRO

Download SDF File 
Download CCD File 
A, B
SEROTONIN
3-(2-AMINOETHYL)-1H-INDOL-5-OL
C10 H12 N2 O
QZAYGJVTTNCVMB-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SROKd: 4.3 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.218 
  • Space Group: P 62 2 2
Unit Cell:
Length (Å)Angle (°)
a = 120.012α = 90.00
b = 120.012β = 90.00
c = 244.747γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-07-27
    Type: Initial release
  • Version 1.1: 2017-11-08
    Type: Refinement description
  • Version 1.2: 2019-10-23
    Type: Data collection, Database references