This protein is expressed in the tail neuron PVT and in uterine cells in C. elegans [worm-base]. In Saccharomyces cerevisiae this is AdoMet dependent proline di-methyltransferase. This enzyme catalyses the di-methylation of ribosomal proteins Rpl12 and Rps25 at N-terminal proline residues. The methyltransferases described here specifically recognise the N-terminal X-Pro-Lys sequence motif, and they may account for nearly all previously described eukaryotic protein N-terminal methylation reactions. A number of other yeast and human proteins also share the recognition motif and may be similarly modified [1]. As with other methyltransferases, this family carries the characteristic GxGxG motif.

1: Identification of protein N-terminal methyltransferases in yeast and humans. Webb KJ, Lipson RS, Al-Hadid Q, Whitelegge JP, Clarke SG; Biochemistry. 2010;49:5225-5235. PMID:20481588