title: Protease susceptibility of human A influenza virus polypeptides.
abstract: The proteolytic susceptibility of polypeptides of four antigenically distinct subtypes of influenza a virus strains of human origin was studied. The extent of degradation of polypeptide molecules of strains A/PR/8/34 (H0N1) (PR), A/FM/1/47 (H1N1), A/Singapore/1/57 (H2N2) and A/Hong Kong/8/68 (H3N2), assessed by densitometry of gels after sodium dodecylsulfate polyacrylamide gel electrophoresis was variable by treatment with trypsin. Also, sequential treatment of PR strain initially with phospholipase D followed by proteases of different specificities suggested differences in susceptibility of surface and internal polypeptide molecules. The significance of these results is discussed.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D004591:Electrophoresis, Polyacrylamide Gel; D009980:Influenza A virus / Q000276:immunology / Q000378:metabolism*; D010447:Peptide Hydrolases / Q000378:metabolism*; D010455:Peptides / Q000378:metabolism*; D010739:Phospholipase D / Q000378:metabolism; D011489:Protein Denaturation; D014357:Trypsin / Q000378:metabolism; D014764:Viral Proteins / Q000378:metabolism*
chemical_list: D010455:Peptides; D014764:Viral Proteins; D010739:Phospholipase D; D010447:Peptide Hydrolases; D014357:Trypsin