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BCCV Gn
BCCV Gn Full Name
Black Creek Canal virus Glycoprotein N
BCCV Gn Introduction
Black Creek Canal virus (BCCV) Gn is the companion surface glycoprotein to Gc, both derived from proteolytic cleavage of the glycoprotein precursor polyprotein encoded by the M segment of the BCCV genome. BCCV is a New World hantavirus discovered in 1993 in Dade County, Florida, associated with a fatal case of hantavirus pulmonary syndrome (HPS). The cotton rat (Sigmodon hispidus) serves as the primary reservoir. BCCV Gn is a type I transmembrane glycoprotein of approximately 70 kDa, characterized by an N-terminal extracellular domain, a single transmembrane helix, and a short cytoplasmic tail. The extracellular domain contains multiple N-linked glycosylation sites critical for protein folding and immune recognition. Gn is the more abundant of the two glycoproteins on the virion surface and forms the structural scaffold of the characteristic square glycoprotein lattice. In the endoplasmic reticulum, Gn forms stable heterodimers with Gc, and this association is prerequisite for proper Golgi trafficking and virion assembly.
Figure 1. Antigenic mapping and functional characterization of human New World hantavirus neutralizing antibodies.
BCCV Gn plays a primary role in host cell receptor recognition and attachment. The Gn head domain interacts directly with β3 integrins, specifically αvβ3 integrin, which is abundantly expressed on vascular endothelial cells—the principal target of hantavirus infection. This receptor-virus interaction determines the endothelial cell tropism that underlies the capillary leak and pulmonary edema characteristic of HPS. Beyond receptor binding, BCCV Gn participates in virion assembly by directing glycoprotein trafficking to the Golgi-derived budding compartment and facilitating the packaging of viral ribonucleocapsids into nascent virions. Gn also contributes to innate immune evasion; studies on related hantaviruses have demonstrated that Gn can suppress type I interferon production by interfering with RIG-I/MAVS signaling and TBK1-mediated IRF3 phosphorylation. The Gn cytoplasmic tail interacts with NP and the RdRp, coordinating genome packaging. BCCV Gn harbors key antigenic epitopes recognized by neutralizing antibodies, and the Gn-Gc interface represents a vulnerable target for cross-neutralizing antibody responses.
BCCV Gn is an important antigen for both serological diagnostics and vaccine design targeting New World hantaviruses. Recombinant Gn protein has been utilized in enzyme-linked immunosorbent assays (ELISAs) to detect anti-hantavirus IgG and IgM in human and rodent sera, enabling seroepidemiological surveillance of BCCV in the southeastern United States. In vaccine development, BCCV Gn has been evaluated as a component of recombinant subunit vaccines and viral-vectored vaccine candidates. Co-expression of Gn and Gc is generally required to elicit conformationally authentic neutralizing antibodies, as many protective epitopes depend on the native Gn-Gc quaternary structure. DNA vaccines encoding the complete M segment of BCCV have demonstrated immunogenicity in rodent models, generating both humoral and cellular immune responses. The Gn cytoplasmic tail has been explored as a target for antiviral compounds that disrupt glycoprotein-RNA interactions during assembly. Further structural and immunological characterization of BCCV Gn will support the development of broadly protective hantavirus vaccines capable of addressing the antigenic diversity of New World hantaviruses endemic to North America.
Alternate Names for BCCV Gn
Black Creek Canal orthohantavirus; Black Creek Canal virus; BCCV; BCCV Glycoprotein N; BCCV Glycoprotein G1; BCCV Gn; BCCV G1
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