Hepatitis B virus large surface protein (pre-S2 domain) (null)

The *pre-S2 domain* is a 55-amino acid region found within the middle (MHBs) and large (LHBs) envelope proteins of hepatitis B virus. HBsAg proteins are essential for virus particle assembly, morphogenesis, and infectivity. The pre-S2 domain acts mainly as a structural spacer, supporting proper folding and capsid binding during viral envelope formation[3][5]. Mutations in the pre-S2 region can facilitate immune escape and affect serological detection[5]. The surface antigen proteins, containing pre-S2, are key diagnostic biomarkers and targets for both vaccination and therapeutic intervention. Drug interactions occur primarily through neutralizing antibody recognition or, in the case of entry inhibitors, through the NTCP receptor rather than direct pre-S2 targeting. Pre-S2 mutants have been associated with adverse liver disease outcomes and may complicate therapy or disease monitoring[1][5][7].

Other names

HBV pre-S2 domainpre-S2 region of hepatitis B surface antigenHBV surface protein middle domain

Inhibition of viral entry by blocking envelope protein-receptor interaction (e.g., NTCP) Neutralization of virus via antibody binding to HBsAg containing pre-S2 domains