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NiV G Protein
NiV G Protein Full Name
Nipah virus G glycoprotein
NiV G Protein Introduction
The Nipah virus (NiV) G glycoprotein is the central determinant of viral attachment and the initiator of membrane fusion, making it a pivotal factor in viral entry and pathogenesis. NiV-G is a type II transmembrane protein that assembles as a tetramer on the viral surface, comprising a membrane-proximal stalk domain and a distal globular head domain. The head adopts a six-bladed β-propeller architecture and is responsible for high-affinity binding to the cellular receptors ephrin-B2 and ephrin-B3, which are widely expressed in endothelial and neuronal tissues. This receptor specificity underlies the broad tropism and severe systemic manifestations of NiV infection. Structural studies have demonstrated that receptor engagement induces conformational rearrangements within the G head, while the stalk domain stabilizes oligomerization and plays an essential regulatory role in signal transmission. Beyond receptor recognition, N-linked glycans on NiV-G modulate structural stability, shield vulnerable epitopes from antibody access, and influence the efficiency of viral entry. Thus, NiV-G integrates receptor binding, conformational regulation, and immune evasion within a single multifunctional attachment protein.
Figure 1. Schematic representation of the viral structure and genome organization. (Source: Sun B, et al. 2018)
Functionally, NiV-G operates in tight coordination with the fusion glycoprotein F to mediate viral entry. While G binds host receptors, F executes membrane merger; however, F activation strictly depends on receptor-induced conformational changes in G. Accumulating evidence supports a multi-step triggering mechanism in which ephrin binding first alters the G head domain, followed by structural rearrangements in the stalk that transmit an activation signal to F. This G–F coupling represents an allosteric communication system, where both head and stalk domains contribute to fusion triggering. Mutational analyses of the stalk region disrupt G–F interaction and impair fusion, underscoring its signaling function. Glycosylation further modulates this process by influencing epitope exposure and fusogenicity, illustrating a finely balanced interplay between structural integrity, receptor engagement, and immune shielding. Although mechanistic nuances remain—particularly regarding the relative contributions of head versus stalk domains—the consensus view positions NiV-G as the master regulator of fusion activation through coordinated receptor binding and structural signaling.
Given its central role in entry, NiV-G is a prime target for vaccines and antibody-based therapeutics. Neutralizing antibodies directed against the receptor-binding head can block ephrin engagement, while others targeting the stalk may interfere with G–F signaling. At the same time, antibodies against the prefusion form of NiV-F complement G-directed responses by preventing membrane fusion after receptor attachment. This dual-target strategy supports the rationale for vaccines that elicit immunity against both G and F, thereby blocking multiple stages of viral entry and reducing the likelihood of escape mutations. Recombinant vector platforms, DNA and mRNA vaccines, and Fc-fusion constructs incorporating NiV-G domains have demonstrated promising immunogenicity in animal models, highlighting the translational potential of G-focused interventions. Moreover, understanding glycan-mediated antigenic shielding and epitope accessibility on NiV-G is critical for rational immunogen design. Collectively, structural and functional insights into NiV-G not only clarify the molecular basis of NiV entry but also guide the development of broadly protective countermeasures against henipavirus infection.
Alternate Names for NiV G Protein
Nipah virus; NIV; Nipah henipavirus; Paramyxoviridae; Henipavirus; G glycoprotein; G protein; Nipah virus G glycoprotein; Nipah virus G protein; NIV G glycoprotein; NIV G protein
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