Figure 5

Glycine-rich N-terminal domains may have arisen by coding sequence inversion. An alignment of a part of the DNA sequences encoding glycine-rich N-terminal domains of several angiosperm HyPRPs (constructed manually with the aid of BioEdit) suggests a possible mechanism of independent acquisition of Gly-rich N-termini by inversion of a region encoding a part of a conventional Pro-rich domain. Triplets encoding glycine (when read left to right) are shown in red letters, while those encoding proline on the opposite strand are highlighted in gray (dark and bright shades used to distinguish individual triplets). Nucleotides conserved in at least two thirds of the sequences are shown in bold and marked by dots, absolutely conserved positions are marked by asterisks. Note the generally low degree of sequence conservation.