Purification and partial characterization of human lymphoblast interferon.

Abstract
One component of human lymphoblastoid interferon [a potential antitumor and antiviral agent] obtained from Namalwa cultures induced by Newcastle disease virus was purified to a specific activity of 2.5 .times. 108 interferon units/mg of protein (protein content based on amino acid analysis). A single polypeptide species with an apparent MW of 18,500 comigrating with the antiviral [vesicular stomatitis virus] activity was observed by sodium dodecyl sulfate/polyacrylamide gel electrophoresis. Preliminary amino-terminal sequencing results suggest that the interferon species is essentially homogeneous.