該基因編碼poly（a）聚合酶家族的一個成員，該家族催化dna/rna鏈3'端的模板無關延伸。這種酶在氨基酸水平上與特征良好的聚（A）聚合酶II（papi）有60%的同源性這兩種酶具有相似的結構域和功能域組織這種酶僅局限于細胞核內，表現出非特異性和CPSF（裂解和聚腺苷酸化特異因子）/AAUAAA依賴的聚腺苷酸化活性該基因位于2號染色體上，而papi基因位于14號染色體上。
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.