10.1371/journal.pgen.1003767.g003 Andreas Czech Andreas Czech Sandra Wende Sandra Wende Mario Mörl Mario Mörl Tao Pan Tao Pan Zoya Ignatova Zoya Ignatova Human CCA-adding enzyme is able to repair damaged CCA ends of tRNAs. Public Library of Science 2013 cca-adding enzyme damaged cca ends 2013-08-29 07:57:09 Figure https://plos.figshare.com/articles/figure/_Human_CCA_adding_enzyme_is_able_to_repair_damaged_CCA_ends_of_tRNAs_/784930 <p>(A) Total HeLa tRNAs and (B) internally radioactively labeled yeast tRNA<sup>Phe</sup> were incubated successively with angiogenin and human CCA-adding enzyme. Subsequently to the angiogenin treatment (4 h), T4 polynucleotide kinase (PNK) (45 min) was added which converts the 2′,3′-cyclophosphate ends <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1003767#pgen.1003767-Rybak1" target="_blank">[42]</a> generated by the angiogenin cleavage to free 3′OH. After purification tRNAs were subjected to treatment with the CCA-adding enzyme (30 min). The 3′-CCA end integrity of the HeLa tRNAs was determined with the fluorescent oligonucleotide (<a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1003767#pgen-1003767-g001" target="_blank">Figure 1A</a>, schematic inset). tRNA<sup>Phe</sup> lacking the terminal 3′-adenosine (tRNA<sup>Phe</sup>CC) served as a control. The numbers on the left denote the DNA ladder in nt.</p>