Mediates the import of RPA complex into the nucleus, possibly via some interaction with importin beta. Isoform 2 is sumoylated and mediates the localization of RPA complex into the PML body of the nucleus, thereby participating in RPA function in DNA metabolism.
Isoform 2 is sumoylated. Sumoylation is required for localization in the nuclear PML body and transport of RPA complex in PML body. Upon UV irradiation and during S phase, it is desumoylated, releasing RPA complex that is translocated to sites of DNA damage. Sumoylation takes place at different Lys residues.