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Methods of constructing libraries of genetic packages that collectively display the members of a diverse family of peptides, polypeptides or proteins

  • US 9,382,535 B2
  • Filed: 02/28/2006
  • Issued: 07/05/2016
  • Est. Priority Date: 04/17/2000
  • Status: Expired due to Term
First Claim
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1. A method for preparing a nucleic acid, the method comprising the steps of:

  • (i) amplifying a nucleic acid that encodes a polypeptide using a primer complementary to at least part of a synthetic sequence located at the 5′

    terminus of the nucleic acid sequence;

    (ii) rendering the amplified nucleic acid obtained from step (i) single-stranded;

    (iii) hybridizing the single-stranded nucleic acid obtained from step (ii) with a single-stranded oligonucleotide to form a locally double-stranded region, wherein there is a single site for a restriction endonuclease within the locally double-stranded region;

    (iv) forming a cleaved DNA complex by cleaving the locally double-stranded region formed by the hybridizing step (iii) with the restriction endonuclease at the single site for the restriction endonuclease to remove all unwanted 5′

    nucleotides from the amplified nucleic acid; and

    (v) cloning the cleaved DNA complex obtained from step (iv) a vector for expressing the polypeptide encoded by the nucleic acid;

    wherein the hybridizing and the cleaving steps are performed at a temperature under which the single-stranded nucleic acid is maintained in substantially single-stranded form and associates with the single-stranded oligonucleotide to form the locally double-stranded region, and wherein the restriction endonuclease is active at the temperature.

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