Catalytic protein subunits of telomerase from the ciliateEuplotes aediculatus and the yeast Saccharomyces cerevisiae contain reverse transcriptase motifs. (science.sciencemag.org)
Genomewide analysis of chromatin marks also suggested that normal interactions between the C - terminus of the Rag2 protein subunit and a specific chromatin modification helps maintain the fidelity of DNA target recognition by the enzyme. (sciencedaily.com)
Very large aggregates can be formed from protein subunits, for example many thousand actin molecules assemble into an actin filament. (sciencedaily.com)