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The 2A proteinase of human rhinovirus 2 cleaves itself off the growing polyprotein at its own N terminus during translation; this property was used to develop an in vivo screening system with the lacZ gene fragment of M13mp18. The fusion of an active 2A proteinase to the C-terminus of the alpha-fragment did not affect alpha-complementation, as the proteinase cleaved itself off the alpha-fragment. However, an inactive 2A proteinase remained fused to the alpha-fragment hindering alpha-complementation. Random mutations were then introduced into the 2A gene site by PCR amplification. Mutants defective in alpha-complementation (thus containing an inactive 2A proteinase) were obtained at an efficiency of 5%, mutants showing reduced 2A activity at an efficiency of 1%. Mutants showing reduced or no 2A activity were then subjected to PCR mutagenesis. Three mutants reactivating an inactive 2A proteinase were examined and the compensatory changes determined.

USING PROTEINASE TRAPPING TO DETECT REVERTANTS OF INACTIVE RHINOVIRAL 2A PROTEINASE MUTANTS