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Amino acid sequence and positions analyzed by mutagenesis in GtfB and GtfC from S. mutans GS-5. The 19-aa Gtf-P1 (dark region) was identical in GtfB and GtfC. C-terminus direct repeats (shaded) contain 3.5 segments of 65 aa each in GtfB and 2 segments of 49 aa each in GtfC. The numbers refer to the positions of amino acids before and after mutagenesis. Asterisks mark amino acid residues substituted by random or site-directed mutagenesis.
