spp42 Antibody

Biological Role of gp42 in EBV Infection

gp42 is a type II transmembrane glycoprotein essential for EBV’s dual-tropic infection of B cells and epithelial cells . Key functional attributes include:

• Tropism Regulation: gp42 binds to HLA-II on B cells, triggering membrane fusion via interactions with viral gH/gL complexes .

• Conformational Switching: Its N-terminal domain (residues 36–81) mediates high-affinity binding to gH/gL, while the C-terminal lectin domain engages HLA-II .

• Epithelial Cell Entry: Virions lacking gp42 preferentially infect epithelial cells due to reduced HLA-II binding .

Table 1: Functional Domains of EBV gp42

Monoclonal Antibodies Targeting gp42

Recent studies describe human and murine monoclonal antibodies (mAbs) neutralizing EBV by targeting gp42:

Key Antibodies and Epitopes

• 2B7 and 2C1: Human mAbs isolated via single B cell cloning. Both neutralize EBV in B cells and epithelial cells by binding distinct gp42 epitopes outside the HLA-II interface .

  • 2C1: Targets a hydrophobic patch (residues I159, F188, Y194) critical for membrane fusion .

  • 2B7: Binds a linear epitope near the N-terminal gH/gL interaction site .

• F-2-1: Murine mAb blocking HLA-II binding, effective only against B cell infection .

Table 2: Anti-gp42 Antibody Characteristics

Research Gaps and Future Directions

• No commercial antibodies labeled "spp42" are cataloged in major biorepositories (e.g., Abcam, ATCC) .

• Standardized validation protocols (e.g., KO cell lines, SPR) are needed to improve antibody reproducibility .