Methods of constructing libraries comprising displayed and/or expressed members of a diverse family of peptides, polypeptides or proteins and the novel libraries
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. Methods of screening those libraries and the peptides, polypeptides or proteins identified by such screens.
1. A method of producing a library of immunoglobulin genes, the method comprising:
(i) providing a nucleic acid comprising a heavy chain variable region (V H ) framework, which comprises a framework region 1 (FW1), a complementary determining region 1 (CDR2), a framework region 2 (FW2), a complementary determining region 2 (CDR2), a framework region 3 (FW3), a complementary determining region 3 (CDR3), and a framework 4 (FR4) in the orientation of FW1-CDR1-FW2-CDR2-FW3-CDR3-FW4;
(ii) introducing synthetic diversity into at least one of the CDR1 and CDR2 in the V H framework; and
(iii) cloning the sequence of V H CDR3 regions of immunoglobulin genes from B cells to capture the natural diversity of the V H CDR3 regions, and introducing the cloned CDR3 regions into the V H framework; thereby producing a first set of immunoglobulin genes encoding a plurality of immunoglobulin heavy chain variable regions.
2. The method of claim 1 , wherein synthetic diversity is introduced into both the CDR1 and CDR2 in the V H framework.
3. The method of claim 1 , wherein the V H framework is a human 3-23 framework.
4. The method of claim 1 , wherein:
(a) the synthetic diversity of V H CDR1 is represented by the formula —X1-Y—X2-M-X3-(SEQ ID NO: 636), in which X1, X2, and X3 are independently selected from the group consisting of A, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, and Y; and
(b) the synthetic diversity of V H CDR2 is represented by the formula X4-I-X5-X6-S-G-G-X7-T-X8-Y-A-D-S-V-K-G- (SEQ ID NO: 637), in which X4 and X5 are independently selected from the group consisting of Y, R, W, V, G, and S, X6 is selected from the group consisting of P and S, and X7 and X8 are independently selected from the group consisting of A, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, and Y.
5. The method of claim 1 , wherein:
(a) the synthetic diversity of V H CDR1 is represented by the formula —X1-Y—X2-M-X3-(SEQ ID NO: 636), in which X1, X2, and X3 are independently a mixture of A, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, and Y; and
(b) the synthetic diversity of V H CDR2 is represented by the formula X4-I-X5-X6-S-G-G-X7-T-X8-Y-A-D-S-V-K-G- (SEQ ID NO: 637), in which X4 and X5 are independently a mixture of Y, R, W, V, G, and S, X6 is a mixture of P and S, and X7 and X8 are independently a mixture of A, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, and Y.
6. The method of claim 1 , further comprising combining the first set of immunoglobulin genes with a second set of immunoglobulin genes encoding a plurality of antibody light chain variable regions.
7. The method of claim 6 , wherein the second set of immunoglobulin genes are derived from immunoglobulin light chain genes from B cells.
8. The method of claim 1 , wherein the B cells are from a human patient having an autoimmune disease.
9. The method of claim 8 , wherein the autoimmune disease is selected from the group consisting of systemic lupus erythematosus, systemic sclerosis, rheumatoid arthritis, antiphospholipid syndrome and vasculitis.
10. The method of claim 1 , wherein the first set of immunoglobulin genes are in phage vectors or in phagemid vectors.
11. The method of claim 10 , wherein the phage vectors or phagemid vectors collectively further comprise a second set of immunoglobulin genes encoding immunoglobulin light chain variable regions.
12. The method of claim 10 , wherein the first set of immunoglobulin genes are linked via a short linker to the final portion of M13 gene III.
13. The method of claim 10 , wherein the phage vectors further comprise a wild-type gene III and a truncated gene III.
14. The method of claim 6 , further comprising introducing the first set and second set of immunoglobulin genes into host cells to produce a plurality of genetic packages expressing the plurality of immunoglobulins encoded by the first set and second set of immunoglobulin genes.
15. The method of claim 14 , wherein the genetic packages are filamentous phage particles or yeast cells.
16. The method of claim 14 , wherein the plurality of immunoglobulins are displayed on the surface of the genetic packages.
17. The method of claim 1 , wherein in step (iii) the cloning is performed by amplifying the sequence of V H CDR3 regions of immunoglobulin genes from B cells using amplification primers that anneal outside of the V H CDR3 regions.