... mutagenesis kit(Stratagene, La Jolla, CA, USA) and the primers AkpnI:5¢-GATACATGGTATCGTCCAAAAC-3¢; AsacI: 5¢-GTGAAGAAATATGAGCTCTATAATATTCCGG-3¢; and AsalI: 5¢-CTTGCTAACGATGTCGACAACTCTAATCC-3¢ ... transglucosylation and hydro-lysis activity ratios. Application of directed evolutionstrategies, using random and rational mutagenesisapproaches, has allowed conversion of CGTase intoan a- amylase ... the N-termini of the cata-lytic domains that modulate glucan and oligosaccha-ride synthesis, six additional hybrid proteins wereconstructed. The N-terminal parts of the catalyticdomains of...