7CBP

CryoEM structure of Zika virus with Fab at 4.1 Angstrom

Summary for 7CBP

• Entry DOI: 10.2210/pdb7cbp/pdb
• EMDB information: 30337
• Descriptor: Small envelope protein M, Envelope protein E, Fab Heavy chain, ... (5 entities in total)
• Functional Keywords: zika virus, fab antibody, virus
• Biological source: Homo sapiens; More
• Total number of polymer chains: 10
• Total formula weight: 283337.07

Authors

Tyagi, A.,Ahmed, T.,Shi, J.,Bhushan, S. (deposition date: 2020-06-13, release date: 2020-07-08, Last modification date: 2020-07-29)

Primary citation

Tyagi, A.,Ahmed, T.,Shi, J.,Bhushan, S.
A complex between the Zika virion and the Fab of a broadly cross-reactive neutralizing monoclonal antibody revealed by cryo-EM and single particle analysis at 4.1 angstrom resolution.
J Struct Biol X, 4:100028-100028, 2020

PubMed Abstract: Zika virus (ZIKV) recently emerged as a major public health concern because it can cause fetal microcephaly and neurological disease such as the Guillain-Barré syndrome. A particularly potent class of broadly neutralizing antibodies (nAbs) targets a quaternary epitope located at the interface of two envelope proteins monomers, exposed at the surface of the mature virion. This "E-dimer-dependent epitope" (EDE), comprises the fusion loop of one monomer at the tip of domain II of E and a portion of the domains I and III of the adjacent monomer. Since this epitope largely overlaps with the binding site of the precursor membrane protein (prM) during Zika virion maturation, its molecular surface is evolutionary conserved in flaviviruses such as Dengue and Zika viruses, and can elicit antibodies that broadly neutralize various ZIKV strains. Here, we present a cryo-EM reconstruction at 4.1 Å resolution of the virion bound to the antigen binding fragment (Fab) of an antibody that targets this mutationally-constrained quaternary epitope. The Fab incompletely covers the surface of the virion as it does not bind next to its 5-fold icosahedral axes. The structure reveals details of the binding mode of this potent neutralizing class of antibodies and can inform the design of immunogens and vaccines targeting this conserved epitope.

PubMed: 32647830
DOI: 10.1016/j.yjsbx.2020.100028

Experimental method

ELECTRON MICROSCOPY (4.1 Å)