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It is shown that exchanges of single invariant amino acids in two C-terminal catalytic domain segments of the glucosyltransferase R (GtfR) strongly affect its catalytic properties. Drastic decreases of activity through re- or displacements of Tyr965 demonstrate a crucial role of this residue. Similarly, exchanges of amino acids Asp1004, Val1006, and Tyr1011 profoundly influenced catalytic parameters...
Segments that may crucially influence the catalytic behaviour of glucosyltransferases of the glucansucrase type were selected for modification. This was done by sequence alignments, followed by structural modelling of the putative catalytic domain, based on a permuted form of the glucosyltransferase R (GtfR) of Streptococcus oralis. Five selected regions, located in the C-terminal half of the potential...
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