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Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods
Published on: December 21, 2019
In silico prediction of the binding structure between vitellogenin and vitellogenin receptor of Haemaphysalis
Meryem Behri1, Hayato Kawada2,3, Yuki Koike3
1Laboratory of Global Animal Resource Science, Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
Abstract:
Vitellogenin (Vtg) and its receptor (VtgR)-essential for yolk deposition and transovarial pathogen transmission in ticks-are compelling targets for antibody-based intervention. To investigate their interaction in the tick Haemaphysalis longicornis, we employed AlphaFold2 to model the β-barrel domain of the midgut-synthesized paralog HlVtg1 and the first three ligand-binding repeats (LBR1-3) of HlVtgR. Subsequent protein-protein docking in Molecular Operating Environment (MOE) revealed a recurrent binding interface centered on HlVtg1's Glu87, which formed persistent electrostatic interactions with LBR1-3 across top-ranking poses. Our results support a "monomeric engagement" model, where a single HlVtg1 monomer simultaneously engages all three low-density lipoprotein receptor class-A (LDLRA) domains of HlVtgR. This mechanism contrasts with the classical dimeric model and challenges prior inferences about stoichiometry and symmetry of binding sites. The predicted contact residues defined here may serve as a useful basis for evaluating candidate epitopes for interventions aimed at disrupting oocyte maturation and transovarial transmission of pathogens in H. longicornis.
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