Hantavirus Glycoprotein

Hantavirus Glycoprotein Full Name

Hantavirus Glycoprotein

Hantavirus Glycoprotein Introduction

Hantavirus glycoproteins Gn and Gc are the two envelope surface proteins encoded by the M (medium) segment of all members of the genus Orthohantavirus within the family Hantaviridae. The M segment open reading frame is translated into a single polyprotein precursor that is cleaved by host signal peptidase and subtilisin-like proteases in the endoplasmic reticulum to yield Gn (approximately 65–74 kDa) and Gc (approximately 52–58 kDa). Both glycoproteins are type I transmembrane proteins with large ectodomains, a single transmembrane helix, and short cytoplasmic tails. Gn and Gc are extensively N-glycosylated, with 3–5 glycosylation sites on Gn and 2–4 on Gc depending on the species. Within the virion envelope, Gn and Gc assemble into higher-order square lattice arrays that give hantaviruses their characteristic surface morphology visible by cryo-electron microscopy. The glycoprotein complex is responsible for receptor recognition, membrane fusion, virion assembly, and budding. Gn and Gc also constitute the principal targets of neutralizing antibody responses during natural infection.

Figure 1. Characterization of Hantavirus N Protein Intracellular Dynamics and Localization.

The hantavirus Gn/Gc complex mediates host cell entry through a multi-step process beginning with attachment to cell surface integrins. Old World hantaviruses (e.g., PUUV, HTNV) preferentially use α5β1 integrin, while New World hantaviruses (e.g., SNV, ANDV) primarily engage αvβ3 integrin, a key determinant of endothelial cell tropism. Gn is responsible for receptor engagement through its head domain, while Gc functions as a class II fusion protein that undergoes pH-triggered conformational change within endosomes to fuse viral and host membranes. The fusion mechanism involves the conserved fusion loop in Gc domain II inserting into the target membrane, followed by hairpin formation between domains II and III. The Gn cytoplasmic tail plays a critical role in virion assembly by recruiting NP-encapsidated RNA genomes to the Golgi-derived budding compartment. Both glycoproteins actively suppress host innate immune signaling; Gn inhibits RIG-I/MAVS-dependent interferon induction, while Gc can modulate complement activation. The Gn-Gc heterodimeric interface harbors conformational epitopes recognized by cross-neutralizing antibodies, making it a high-priority target for structure-based vaccine design.

Hantavirus glycoproteins are the primary targets for vaccine development and immunotherapeutic interventions against both hantavirus pulmonary syndrome (HPS) and hemorrhagic fever with renal syndrome (HFRS). Several vaccine platforms encoding or expressing Gn/Gc have advanced to clinical evaluation, including inactivated whole-virus vaccines licensed in South Korea and China, recombinant adenovirus vectors, DNA vaccines, and virus-like particle (VLP) formulations. The requirement for conformationally authentic Gn-Gc quaternary structure to elicit neutralizing antibodies has motivated the development of recombinant subunit vaccines and stabilized trimeric Gc immunogens. Broadly neutralizing monoclonal antibodies targeting conserved Gc fusion loop and Gn-Gc interface epitopes have shown efficacy against multiple hantavirus species in preclinical models and represent promising candidates for post-exposure prophylaxis. Serological assays using recombinant Gn/Gc antigens provide species-specific diagnosis complementary to the broadly cross-reactive NP-based assays. Continued structural characterization of Gn/Gc from diverse hantavirus species is essential for rational design of a universal hantavirus vaccine capable of protecting against the full spectrum of pathogenic hantaviruses worldwide.

Alternate Names for Hantavirus Glycoprotein

Hantavirus Glycoprotein; Orthohantavirus; Hantavirus; Hantaviridae; Bunyavirales; gp

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