SARS Coronavirus is an enveloped virus containing three outer structural proteins， namely the membrane （M）， envelope （E）， and spike （S） proteins. Spike （S）-glycoprotein of the virus interacts with a cellular receptor and mediates membrane fusion to allow viral entry into susceptible target cells. Accordingly， S-protein plays an important role in virus infection cycle and is the primary target of neutralizing antibodies.
Store lyophilized protein at -20℃. Aliquot the product after reconstitution to avoid repeated freezing/thawing cycles. Reconstituted protein can be stored at 4℃ for a limited period of time； it does not show any change after two weeks at 4℃.
The lyophilized protein remains stable until the expiry date when stored at -20℃.
