Abstract: Single AAV vector constructs for regulated expression of an immunoglobulin molecule or fragment thereof and methods of making and using the same are described. The AAV vectors comprise a regulated promoter operably linked to the coding sequence for a first and second immunoglobulin coding sequence, a sequence encoding a self-processing cleavage site between the coding sequence for the first and second immunoglobulin coding sequence and a additional proteolytic cleavage site, which provides a means to remove the self processing peptide sequence from an expressed immunoglobulin molecule or fragment thereof. The vector constructs find utility in enhanced production of biologically active immunoglobulins or fragments thereof in vitro and in vivo.