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The Location of the Bromelain Cleavage Site in a Hong Kong Influenza Virus Haemagglutinin

CSIRO, Division of Protein Chemistry, Parkville, 3052, Victoria, Australia

The site of bromelain cleavage in the haemagglutinin of the Hong Kong influenza virus A/Memphis/102/72 has been determined by using a diagonal peptide mapping procedure on the thermolytic digest of amidated BHA. The data show that bromelain cleavage removes the C-terminal 46 residues from HA2, and that the new carboxyl-terminal residue of BHA2 is Gly 175. This is close to the beginning of the hydrophobic membrane-interacting sequence that starts at residue 183.

Received 21 July 1980; accepted 3 September 1980.

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