Figure 7. Alignment of Top1 junction region amino acid sequences.
Indicated nuclear Top1s with junction region aa shown in single letter code. The conserved WXWW motif that forms the Trp anchor in human Top1 is in bold and underlined. *Yeast (Saccharomyces cerevisiae) contains a Tyr in place of human Top1 Trp203, and a Lys in place of human Top1 Glu208, both are in bold. Plant and bacterial Top1s lack a WXWW motif and so are not shown (see Results and Discussion).