| abstract |
The present invention allows the screening of previously established genebanks or libraries by proxy for genes encoding secreted, partially secreted, or cell surface-displayed polypeptides of industrial interest, such as enzymes, receptors, cytokines, peptide hormones etc. that would not likely have been isolated using conventional screening assays. A method for isolating genes encoding secreted, partially secreted, or cell surface displayed polypeptides from existing gene libraries is described in which the endogenous secretion signal sequences are detected using an in vitro polynucleotide insertion reaction where the inserted polynucleotide comprises a promoter-less and secretion signal-less secretion reporter. |