Identification of Potential Binding Region of Annexin II and Dengue
Virus Envelop Glycoprotein
Abstract
The tissue tropism of a virus is a key determinant of viral
pathogenicity which is often modulated by the presence or absence of
appropriate molecules on the surface of a host cell that can be used by
the virus to gain entry into that cell. Annexin II was seen to interact
with dengue virus (DENV) and enhanced infection. Herein, we aimed to
explore this interaction as a potential target for the design of
anti-DENV therapeutics. We demonstrated annexin II extracellular
translocation in Vero cells upon exposure to DENV, extracellular and
intracellular colocalization assays as well as co-immunoprecipitation
assay were performed to further confirmed protein interaction. Molecular
docking and molecular dynamic (MD) simulation were employed to identify
the interaction sites. The result showed extracellular translocation of
annexin II upon DENV exposure to the cell, the result further showed
annexin II colocalizing with DENV E-glycoprotein extracellularly and
intracellularly. Furthermore, the result of co-immunoprecipitation assay
shows DENV E glycoprotein pulling down annexin II, and the result of
molecular docking showed strong interaction between the two proteins. MD
simulations has proposed the binding of two regions of annexin II (i)
Y274-K280 and (ii) K369-Q327 with BR3 E glycoprotein of DENV2 (residue
380-389), with potential of infections abrogation upon inhibition.