该基因编码poly（a）聚合酶家族的一个成员，该家族催化dna/rna链3'端的模板无关延伸。这种酶在氨基酸水平上与特征良好的聚（A）聚合酶II（papi）有60%的同源性这两种酶具有相似的结构域和功能域组织这种酶仅局限于细胞核内，表现出非特异性和CPSF（裂解和聚腺苷酸化特异因子）/AAUAAA依赖的聚腺苷酸化活性该基因位于2号染色体上，而papi基因位于14号染色体上[由RefSeq提供，2008年7月]
This gene encodes a member of the poly(A) polymerase family which catalyzes template-independent extension of the 3' end of a DNA/RNA strand. This enzyme shares 60% identity to the well characterized poly(A) polymerase II (PAPII) at the amino acid level. These two enzymes have similar organization of structural and functional domains. This enzyme is exclusively localized in the nucleus and exhibits both nonspecific and CPSF (cleavage and polyadenylation specificity factor)/AAUAAA-dependent polyadenylation activity. This gene is located on chromosome 2 in contrast to the PAPII gene, which is located on chromosome 14. [provided by RefSeq, Jul 2008]