Group B Streptococcus alpha-like surface protein N-terminal domain (Alp N-terminal domain) (Alp N-terminal domain)

Group B Streptococcus (GBS) alpha-like surface protein N-terminal domains are critical structural components of a family of surface-anchored proteins in Streptococcus agalactiae, including Alpha C protein (ACP), Rib, and Alp1-4 (PubMed: 15659483). These domains are located at the amino-terminus of the proteins and are characterized by high sequence conservation within the family, making them attractive targets for broad-spectrum vaccine development (PubMed: 26921208). Biologically, these domains facilitate bacterial attachment to host epithelial cells and contribute to immune evasion by interfering with host complement or antibody-mediated clearance (UniProt: P13515). In the context of disease, GBS is a primary cause of life-threatening neonatal sepsis, meningitis, and pneumonia (CDC). Therapeutic strategies, such as the GBS-NN and GBS-NN2 vaccine candidates, utilize recombinant fusion proteins of these N-terminal domains to elicit protective opsonophagocytic antibodies (Minervax). These antibodies neutralize the bacteria's ability to colonize host tissues and promote their destruction by the immune system.

Other names

Alp family N-terminal domainsAlpha-like protein N-terminal regionsGBS surface protein N-terminal domainsAlp N-terminal regions

Induction of protective opsonophagocytic antibodies that bind to the N-terminal domains of Alp proteins, blocking bacterial adhesion to host cells and facilitating phagocytosis by immune cells (PubMed: 26921208).