This domain is found in poly(A) polymerases and has been shown to have polynucleotide adenylyltransferase activity [1][2][3][4]. Proteins in this family have been located to both the nucleus and the cytoplasm.

1: Two RNAi complexes, RITS and RDRC, physically interact and localize to noncoding centromeric RNAs. Motamedi MR, Verdel A, Colmenares SU, Gerber SA, Gygi SP, Moazed D; Cell. 2004;119:789-802. PMID:15607976

2: Cytoplasmic poly(A) polymerases mediate cellular responses to S phase arrest. Read RL, Martinho RG, Wang SW, Carr AM, Norbury CJ; Proc Natl Acad Sci U S A. 2002;99:12079-12084. PMID:12218190

3: Cid13 is a cytoplasmic poly(A) polymerase that regulates ribonucleotide reductase mRNA. Saitoh S, Chabes A, McDonald WH, Thelander L, Yates JR, Russell P; Cell. 2002;109:563-573. PMID:12062100

4: Requirement of fission yeast Cid14 in polyadenylation of rRNAs. Win TZ, Draper S, Read RL, Pearce J, Norbury CJ, Wang SW; Mol Cell Biol. 2006;26:1710-1721. PMID:16478992