Abstract
Using two Bacillus subtilis alpha-amylase secretion vectors, mouse interferon-beta (IFN-beta) cDNA was expressed. Ten kinds of mature and hybrid forms of biologically active mouse IFN-beta proteins were synthesized in B. subtilis and were secreted into the culture medium. Similar amounts of proteins, which were determined by immunoblot analysis, were secreted from the B. subtilis transformants, while the antiviral activity in the medium was markedly different in each one of them. The highest antiviral activity was observed in a hybrid protein, in which eleven amino acids consisting of the prosequence of alpha-amylase (eight amino acids) and three amino acids encoding in the HindIII linker DNA were assumed to be extended in front of the Leu residue at position 6 of the mature form of mouse IFN-beta. Its activity was higher than that of the mature form of the mouse IFN-beta secreted from a B. subtilis transformant. These results indicate that the amino acid sequence around the NH2-terminal region of the mouse IFN-beta is closely related to the antiviral activity, but the NH2-terminal amino acid is not. The hybrid proteins of mouse IFN-beta show no interferon activity against a human cell line, HEL.
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