Review Article

Archaea Signal Recognition Particle Shows the Way

Figure 3

Features of SRP19 (top), SRP54 (center) and the FtsY SRP receptor (bottom). Indicated are the N- and C-termini. Helices are shown as cylinders, beta-sheets as arrows, and some loops are labeled with an arch and the letter L. Invariant or highly conserved residues are shown boxed, and several amino acid residue inserts which are characteristic for the indicated taxonomic groups are shown as bold letters. Numbering is according to the column positions of each protein alignment accessible as listed in Supplementary Materials 2 and at the SRP database at http://rnp.uthct.edu/rnp/SRPDB/SRPDB.html). Regions and sites which interact with other SRP components or the signal sequence are marked with brackets below each panel.
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