| However , ATX 2 interacts with A2BP1 , a protein containing an RNA recognition motif , and the existence of an interaction motif for the C terminal domain of the poly ( A ) binding protein ( PABC ) as well as an Lsm ( Like Sm ) domain in ATX 2 suggest that ATX 2 like its yeast homolog Pbp 1 might be involved in RNA metabolism . ^^^ |