HBsAg-preS2

Middle surface antigen,PreS2.

The large envelope protein exists in two topological conformations, one which is termed 'external' or Le-HBsAg and the other 'internal' or Li-HBsAg. In its external conformation the protein attaches the virus to cell receptors and thereby initiating infection. This interaction determines the species specificity and liver tropism. This attachment induces virion internalization predominantly through caveolin-mediated endocytosis. The large envelope protein also assures fusion between virion membrane and endosomal membrane. In its internal conformation the protein plays a role in virion morphogenesis and mediates the contact with the nucleocapsid like a matrix protein.

Approximately 5.7 kDa, a single non-glycosylated polypeptide chain containing 55 amino acids，with an N-terminal Met

Sterile Filtered White lyophilized (freeze-dried) powder.

>95% by SDS-PAGE and HPLC analyses.