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The influence of viral envelope glycans is often overlooked, but one should bear in mind that variable glycosylation may affect the properties of viral envelope glycoproteins and potentially alter the course of an infection. Hence, there is a need for simple methods that can be use to identify changes in the glycosylation pattern of viral glycoproteins in a large number of samples. We describe here methods for the analysis of cellline specific changes in glycosylation of the respiratory syncytial virus (RSV) attachment glycoprotein (G), which involve the use of lectins and anti-carbohydrate antibodies. Given the role of the G glycoprotein in RSV antigenicity, we also describe procedures based on Western blotting to determine the effect of G protein glycosylation changes on reactivity with human sera. We found that glycosylation of the C-terminal domain of the G protein reduces reactivity with human sera, indicating that variable glycosylation may contribute to evasion of the humoral immune response by RSV.
