Binds in vitro to PGBD3-related transposable elements, called MER85s; these non-autonomous 140 bp elements are characterized by the presence of PGBD3 terminal inverted repeats and the absence of internal transposase ORF. Expressed in heart and oocytes, but not in granulosa cells (at protein level). PGBD3 gene is located within ERCC6 intron 5.