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. 2001 Jun 19;98(14):7898–7903. doi: 10.1073/pnas.141222498

Figure 1.

Figure 1

(A) Secondary structure of the B. mojavensis thyA intron (29). Identical nt between the B. mojavensis thyA and phage T4 td introns are shaded. Positions of the I-BmoI, I-TevI, and phage β22 coding sequences are indicated. The I-BmoI stop codon in P8 is indicated by asterisks. (B) Amino acid alignment of I-TevI, I-BmoI, and the fragmentary ORF from phage β22. Identical or conserved amino acids are shaded. The H-T-H motif is indicated by a box (13). The catalytic Arg-27 and Glu-75 (30) are in bold type. Alpha helices (cylinders) and beta-sheets (black arrows), representing secondary structure elements of I-TevI, are drawn above amino acid residues to which they correspond (30). Amino acid positions corresponding to cloned C-terminal DNA-binding domains of I-TevI and I-BmoI are indicated by right-facing arrows.