Labrum-interacting protein from saliva LIPS-2 (34K-2) from Aedes albopictus, native data

  • Classification: SIGNALING PROTEIN
  • Organism(s): Aedes albopictus
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2022-01-03 Released: 2022-07-27 
  • Deposition Author(s): Gabrieli, P., Forneris, F.
  • Funding Organization(s): NATO Science for Peace and Security Program, Ministero dell Universita e della Ricerca, The Giovanni Armenise-Harvard Foundation, Fondazione CARIPLO

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


A salivary factor binds a cuticular protein and modulates biting by inducing morphological changes in the mosquito labrum.

Arnoldi, I.Mancini, G.Fumagalli, M.Gastaldi, D.D'Andrea, L.Bandi, C.Di Venere, M.Iadarola, P.Forneris, F.Gabrieli, P.

(2022) Curr Biol 32: 3493

  • DOI: https://doi.org/10.1016/j.cub.2022.06.049
  • Primary Citation of Related Structures:  
    7TDR, 7TDS

  • PubMed Abstract: 

    The mosquito proboscis is an efficient microelectromechanical system, which allows the insect to feed on vertebrate blood quickly and painlessly. Its efficiency is further enhanced by the insect saliva, although through unclear mechanisms. Here, we describe the initial trigger of an unprecedented feedback signaling pathway in Aedes mosquitoes affecting feeding behavior. We identified LIPS proteins in the saliva of Aedes mosquitoes that promote feeding in the vertebrate skin. LIPS show a new all-helical protein fold constituted by two domains. The N-terminal domain interacts with a cuticular protein (Cp19) located at the tip of the mosquito labrum. Upon interaction, the morphology of the labral cuticle changes, and this modification is most likely sensed by proprioceptive neurons. Our study identifies an additional role of mosquito saliva and underlines that the external cuticle is a possible site of key molecular interactions affecting the insect biology and its vector competence.

  • Organizational Affiliation

    The Armenise-Harvard Laboratory of Structural Biology, Department Biology and Biotechnology, University of Pavia, via Ferrata 9, 27100 Pavia, Italy; Entopar lab, Department of Biosciences, University of Milan, via Celoria 26, 20133, Milan, Italy; Centro Interuniversitario di Ricerca sulla Malaria/Italian Malaria Network, Milan, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
34k2 salivary protein306Aedes albopictusMutation(s): 0 
Find proteins for Q5MIU2 (Aedes albopictus)
Explore Q5MIU2 
Go to UniProtKB:  Q5MIU2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5MIU2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.875α = 90
b = 109.875β = 90
c = 141.782γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
NATO Science for Peace and Security ProgramItalyG5701
Ministero dell Universita e della RicercaItalyPRIN 2017RPHBCW
The Giovanni Armenise-Harvard FoundationItalyCDA 2013
Fondazione CARIPLOItaly2017-0798
Ministero dell Universita e della RicercaItalyDipartimenti di Eccellenza 2018-2022

Revision History  (Full details and data files)

  • Version 1.0: 2022-07-27
    Type: Initial release
  • Version 1.1: 2022-09-07
    Changes: Database references