Yellow fever virus structural protein

Yellow fever virus (YFV) is a member of the genus *Flavivirus* and encodes three main **structural proteins** within its polyprotein precursor: 1. **Capsid Protein (C):** Packages viral RNA into nucleocapsids, interacts with membranes for virion assembly, and has been shown to suppress host RNA silencing mechanisms in mosquito vectors by interfering with Dicer activity[5][6][8]. The C-protein’s ability to bind both RNA and membranes is essential for infectious particle formation. 2. **Pre-membrane/Membrane Glycoprotein (prM/M):** Functions as a chaperone during virion maturation; pr is cleaved from prM during maturation, acting as a “fusion brake” that prevents premature membrane fusion until release into neutral pH environments outside producer cells[1][7]. 3. **Envelope Glycoprotein (E):** Mediates receptor binding and membrane fusion during cell entry. It is also the primary target of neutralizing antibodies generated by natural infection or vaccination—these antibodies correlate strongly with protective immunity against yellow fever disease[1][3][7]. The coordinated function of these proteins enables YFV to assemble infectious particles, enter new host cells via receptor-mediated endocytosis followed by low-pH-triggered membrane fusion, evade immune responses in both vertebrate hosts and mosquito vectors, and establish productive infections. No direct antiviral drugs currently target these proteins clinically; however, their critical roles make them attractive targets for therapeutic intervention—especially through vaccines that elicit strong antibody responses against E-protein epitopes[3]. Safety concerns mainly relate to live attenuated vaccines rather than direct targeting of these proteins themselves. In summary, "Yellow fever virus structural protein" refers collectively to C/prM/E—the core components required for virion structure/function—and represents an established therapeutic/vaccine target class central to flavivirus biology and pathogenesis[1][3][5].

Other names

YFV structural proteinFlavivirus structural protein (context-dependent)Yellow fever virus envelope protein (E)Yellow fever virus capsid protein (C)prM/Membrane glycoprotein (prM/M)

Neutralizing antibodies bind to the envelope (E) protein, blocking viral entry and membrane fusion[3][7]. Potential small molecules or peptides could interfere with E-mediated fusion or capsid assembly, but none are clinically approved.