Heterogeneous nuclear ribonucleoprotein (hnRNP)-protein binding the poly(A) tail of mRNA and probably involved in some steps of pre-mRNA maturation. Both isoform 1 and isoform 2 interact with poly(A)+ RNA in nucleus. Expressed in roots, leaves, stems, flowers, siliques, and seedlings. Present in immature anther tissues (tapetum cells) and mature pollen grains. By both biotic and abiotic stresses (e.g. ozone, oxidative chemicals and pathogens such as virulent and avirulent Pseudomonas syringae). Belongs to the polyadenylate-binding RBP45 family. Truncated N-terminus.