Methods of constructing libraries comprising displayed and/or expressed members of a diverse family of peptides, polypeptides or proteins and the novel libraries
View Patent ↗Methods useful in constructing libraries that collectively display and/or express members of diverse families of peptides, polypeptides or proteins and the libraries produced using those methods are disclose. Methods of screening those libraries and the peptides, polypeptides or proteins identified by such screens are also disclosed.
1. A vector comprising:
(i) a DNA sequence encoding an antibody variable region linked to a fragment of a wild-type PIII anchor which does not mediate infection of phage particles; and
(ii) wild-type gene III;
wherein the nucleic acid sequence encoding the fragment of the wild-type pIII anchor differs from the wild-type gene III to an extent sufficient to reduce homologous recombination between the nucleic acid encoding the fragment of the wild-type PIII anchor and the wild-type gene III,
wherein all the codons in the nucleic acid encoding the fragment of the wild-type pIII anchor have at least one base change introduced per codon compared to the wild-type gene III.
2. The vector of claim 1 , wherein the DNA encodes a Fab.
3. The vector of claim 1 , wherein the DNA encodes heavy chain VHCH1.
4. The vector of claim 3 , wherein the heavy chain VHCH1 is linked to trpIII.
5. The vector of claim 1 , wherein the DNA encodes light chain VLCL.
6. The vector of claim 5 , wherein the light chain VLCL is linked to trpIII.
7. The vector of claim 1 , wherein the DNA encodes scFv.
8. The vector of claim 7 , wherein the scFv is VL-VH.
9. The vector of claim 7 , wherein the scFv is VH-VL.
10. The vector of claim 1 , wherein the DNA sequence encoding the antibody variable region further comprises an inducible promoter.
11. The vector of claim 10 , wherein the inducible promoter regulates expression of the DNA sequence encoding the antibody variable region.
12. The vector of claim 1 , wherein the DNA sequence encoding the antibody variable region further comprises an amber stop codon.
13. The vector of claim 12 , wherein the amber stop codon is located between the antibody variable region and the fragment of the wild-type PIII anchor.
14. The vector of claim 1 , wherein the vector is phage or phagemid.