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 
  • R-Value Observed: 0.220 

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:  
    3Q6P, 3Q6T, 3Q6K

  • 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 confers protective immunity against Leishmania major infection ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
43.2 kDa salivary proteinA, B381Lutzomyia longipalpisMutation(s): 0 
Gene Names: LJM-11LJM11_Clu9
Find proteins for Q5WPU9 (Lutzomyia longipalpis)
Explore Q5WPU9 
Go to UniProtKB:  Q5WPU9
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download Ideal Coordinates CCD File 
C [auth A], E [auth B]CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
SRO
Query on SRO

Download Ideal Coordinates CCD File 
D [auth A], F [auth B]SEROTONIN
C10 H12 N2 O
QZAYGJVTTNCVMB-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SROKd :  4.300000190734863   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 
  • R-Value Observed: 0.220 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.012α = 90
b = 120.012β = 90
c = 244.747γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

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