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New bioactive proteins need to be screened from various microorganisms for the increasing need for industrial and pharmaceutical peptide, proteins, or enzymes. A novel polymerase chain reaction (PCR) method, restriction site-dependent PCR (RSD-PCR), was designed for rapid new genes cloning from genomic DNA. RSD-PCR strategy is based on these principles: (i) restriction sites disperse throughout genomes are candidacy for universal pairing; (ii) a universal primer is a combination of a 3'-end of selected restriction sites, and a 5'-end of degenerated sequence. A two-round PCR protocol was designed and optimized for the RSD-PCR: amplify the single strand target template from genomic DNA by a specific primer and amplify the target gene by using the specific primer and one of the universal RSD-primers. The optimized RSD-PCR was successfully applied in chromosome walking using specific internal primers, and cloning of new genes using degenerated primers derived from NH2-terminal amino acid sequence of protein.

Restriction Site-dependent PCR: An Efficient Technique for Fast Cloning of New Genes of Microorganisms