Rationally designed, synthetic antibody libraries and uses therefor

1. A method of preparing a library comprising synthetic polynucleotides that encode an antibody light chain variable domain and an antibody heavy chain variable domain containing at least 10 6 unique CDRH3 amino acid sequences represented by the formula [N1]-[DH]-[N2]-[H3-JH], the method comprising:

(i) providing a set of light chain kappa CDR3 (VKCDR3) amino acid sequences representative of the human immune repertoire by

(a) obtaining a set of polynucleotide sequences and amino acid sequences of human IGKV and IGKJ genes and alleles;

(b) analyzing the amino acid sequences expressed from such IGKV and IGKJ genes and alleles to determine amino acid residue variation and CDR3 length; and

(c) generating amino acid sequences of rationally designed composition and length based on the determined amino acid residue variation and CDR3 length,

wherein the set of VKCDR3 amino acid sequences provided comprise 1 to 10 of the amino acids found at Kabat positions 89, 90, 91, 92, 93, 94, 95, 95A, 96, and 97, in selected VKCDR3 amino acid sequences derived from a particular IGKV or IGKJ germline sequence;

(ii) providing a set of N1, DH, N2, and H3-JH segments representative of the human immune repertoire, wherein

(a) the N1 and N2 segments are provided by:

obtaining a set of human antibody amino acid sequences;

identifying the amino acid residues at the V-D junction and the D-J junction of the human antibody sequences;

analyzing the amino acid residues at the identified V-D and D-J junctions, respectively, to determine patterns of length and composition of the amino acid residues present at the identified V-D and D-J junctions; and

generating amino acid sequences of rationally designed composition and length based on the determined patterns of length and composition of the amino acid residues present at the identified V-D and D-J junctions,

wherein N1 and N2 are a fixed length of 0, 1, 2, or 3 amino acid residues;

(b) the DH segments are provided by:

obtaining a set of polynucleotide sequences and amino acid sequences of human IGHD genes and alleles;

analyzing the amino acid sequences expressed from such IGHD genes and alleles to determine patterns and length of progressive deletion of nucleotides at the N-terminus and C-terminus; and

generating amino acid sequences of rationally designed composition and length based on the determined patterns and length of progressive deletion of nucleotides at the N-terminus and C-terminus,

wherein a total of (N−1)*(N−2)/2 total sequences are generated for each gene or allele product (N); and

(c) the H3-JH segments are provided by:

obtaining a set of polynucleotide sequences of human IGHJ genes and alleles;

translating the polynucleotide sequences of the human IGHJ genes and alleles; and

progressively deleting one or more amino acids from the N-terminus of the resultant IGHJ amino acid sequences;

(iii) synthesizing polynucleotide sequences that encode each of the N1, DH, N2, and H3-JH segments provided in step (ii); and

(iv) assembling the polynucleotide sequences of step (iii) to produce a library of synthetic polynucleotides encoding a plurality of human antibody CDRH3 amino acid sequences represented by the following formula: [N1]-[DH]-[N2]-[H3-JH],

wherein the diversity of the polynucleotides encoding the unique CDRH3 amino acid sequences is created by polynucleotides having CDRH3 sequences that are different from the CDRH3 sequences of other polynucleotides; and

(v) assembling the CDRH3 from step (iv) into an antibody heavy chain variable domain,

wherein the antibody heavy chain variable domain comprises framework (FRM) and complementary determining regions (CDR) of the formula FRMH1-CDRH1-FRMH2-CDRH2-FRMH3-CDRH3-FRMH4, and assembling the VKCDR3 from step (i) into an antibody light chain variable domain, wherein the antibody light chain variable domain comprises framework and complementary determining regions comprising FRMVK1-VKCDR1-FRMVK2-VKCDR2-FRMVK3-VKCDR3-FRMVK4.

2. The method of claim 1 , wherein the set of N1, DH, N2, and H3-JH segments provided in step (ii) comprise the most frequently occurring amino acids at the corresponding regions of antibody sequences expressed by human B cells.

3. The method of claim 1 , wherein the polynucleotide sequences of step (iii) are synthesized via split-pool synthesis.

4. The method of claim 1 , further comprising the step of recombining the assembled polynucleotide sequences with a vector comprising a heavy chain chassis and a heavy chain constant region to form a full-length heavy chain.

5. The method of claim 4 , wherein the step of recombining is performed in yeast.

6. The method of claim 5 , wherein the yeast is S. cerevisiae.

7. The method of claim 1 , wherein the plurality of CDRH3 amino acid sequences are further represented by the formula [X]-[N1]-[DH]-[N2]-[H3-JH], wherein [X] is any amino acid residue.

8. The method of claim 7 , wherein [X] is selected from the group consisting of G, D, and E.

9. The method of claim 7 , wherein the plurality of CDRH3 amino acid sequences are represented by the formula CA[R/K/T]-[X]-[N1]-[DH]-[N2]-[H3-JH]-[WG(Q/R)G].

10. The method of claim 1 , wherein

(i) the most N-terminal amino acid of the N1 segment, if present, is selected from a group consisting of R, G, P, L, S, A, V, K, I, Q, T and D; the second most N-terminal amino acid of the N1 segment, if present, is selected from a group consisting of G, P, R, S, L, V, E, A, D, I, T and K; and the third most N-terminal N 1 amino acid, if present, is selected from the group consisting of G, R, P, S, L, A, V, T, E, D, K and F; and

(ii) the most N-terminal N2 amino acid, if present, is selected from a group consisting of G, P, R, L, S, A, T, V, E, D, F and H; the second most N-terminal N2 amino acid, if present, is selected from a group consisting of G, P, R, S, T, L, A, V, E, Y, D and K; and the third most N-terminal N2 amino acid, if present, is selected from the group consisting of G, P, S, R, L, A, T, V, D, E, W and Q.

11. The method of claim 1 , wherein the N1 segment is selected from the group consisting of G, P, R, A, S, L, T, V, GG, GP, GR, GA, GS, GL, GT, GV, PG, RG, AG, SG, LG, TG, VG, PP, PR, PA, PS, PL, PT, PV, RP, AP, SP, LP, TP, VP, GGG, GPG, GRG, GAG, GSG, GLG, GTG, GVG, PGG, RGG, AGG, SGG, LGG, TGG, VGG, GGP, GGR, GGA, GGS, GGL, GGT, GGV, D, E, F, H, I, K, M, Q, W, Y, AR, AS, AT, AY, DL, DT, EA, EK, FH, FS, HL, HW, IS, KV, LD, LE, LR, LS, LT, NR, NT, QE, QL, QT, RA, RD, RE, RF, RH, RL, RR, RS, RV, SA, SD, SE, SF, SI, SK, SL, SQ, SR, SS, ST, SV, TA, TR, TS, TT, TW, VD, VS, WS, YS, AAE, AYH, DTL, EKR, ISR, NTP, PKS, PRP, PTA, PTQ, REL, RPL, SAA, SAL, SGL, SSE, TGL, and WGT.

12. The method of claim 1 , wherein the N2 segment is selected from the group consisting of G, P, R, A, S, L, T, V, GG, GP, GR, GA, GS, GL, GT, GV, PG, RG, AG, SG, LG, TG, VG, PP, PR, PA, PS, PL, PT, PV, RP, AP, SP, LP, TP, VP, IG, KG, GW, FP, EG, GGG, GPG, GRG, GAG, GSG, GLG, GTG, GVG, PGG, RGG, AGG, SGG, LGG, TGG, VGG, GGP, GGR, GGA, GGS, GGL, GGT, GGV, D, E, F, H, I K, M, Q, W, Y, AR, AS, AT, AY, DL, DT, EA, EK, FH, FS, HL, HW, IS, KV, LD, LE, LR, LS, LT, NR, NT, QE, QL, QT, RA, RD, RE, RF, RH, RL, RR, RS, RV, SA, SD, SE, SF, SI, SK, SL, SQ, SR, SS, ST, SV, TA, TR, TS, TT, TW, VD, VS, WS, YS, AAE, AYH, DTL, EKR, ISR, NTP, PKS, PRP, TA, PTQ, REL, RPL, SAA, SAL, SGL, SSE, TGL, and WGT.

13. The method of claim 1 , wherein the DH segments are about 3 to about 10 amino acids in length.

14. The method of claim 1 , wherein the DH segment is selected from the group consisting of ATT, GAT, GIV, IVG, VGA, VLLWLLL (SEQ ID NO: 239), ITMIVVVIT (SEQ ID NO: 240), VQWLV (SEQ ID NO: 241), VQQLV (SEQ ID NO: 242), VLRFLEWLLY (SEQ ID NO:243), YYDFWSGYYT (SEQ ID NO: 244) WILYQLLC (SEQ ID NO: 245), LRL (SEQ ID NO: 246), TTVT (SEQ ID NO: 247), VWELL (SEQ ID NO: 248), VDTAMVT (SEQ ID NO: 249), WIQLWL (SEQ ID NO: 250), RILWWLLL (SEQ ID NO: 251), DIVVVVAAT (SEQ ID NO: 252), VLLLWFG (SEQ ID NO: 595), GATT (SEQ ID NO: 623), GIVG (SEQ ID NO: 624), IVGA (SEQ ID NO: 625), VGAT (SEQ ID NO: 626), GIVGA (SEQ ID NO: 627), IVGAT (SEQ ID NO: 628), VGATT (SEQ ID NO: 629), GIVGAT (SEQ ID NO: 630), IVGATT (SEQ ID NO: 631), GIVGATT (SEQ ID NO: 13), YSG, YSGS (SEQ ID NO: 632), YSGSY (SEQ ID NO: 633), YSGSYY (SEQ ID NO: 14), CSSTSC (SEQ ID NO: 622), CSSTSCY (SEQ ID NO: 620), YCSSTSC (SEQ ID NO: 621), CSSTSCYT (SEQ ID NO:617), GYCSSTSC (SEQ ID NO:618), YCSSTSCY (SEQ ID NO: 6 19), GYCSSTSCY (SEQ ID NO:615), YCSSTSCYT (SEQ ID NO:616), GYCSSTSCYT (SEQ ID NO:10), AAM, DIV, IVY, PAA, VPA, VVP, VVV, DIVV (SEQ ID NO: 634), IVVV (SEQ ID NO: 635), PAAM (SEQ ID NO: 636), VPAA (SEQ ID NO:637, VVPA (SEQ ID NO: 638), VYVP (SEQ ID NO: 639), DIVVV (SEQ JD NO: 640), IVVVP (SEQ JD NO: 641), VPAAM (SEQ ID NO: 642), VVPAA (SEQ ID NO:643), VVVPA (SEQ ID NO: 644), DIVVVP (SEQ ID NO:645), IVVVPA (SEQ ID NO:646), VVPAAM (SEQ ID NO: 647), VVVPAA (SEQ ID NO: 648), DIVVVPA (SEQ ID NO: 649), IVVVPAA (SEQ ID NO:650), VVVPAAM (SEQ ID NO. 651), DIVVVPAA (SEQ ID NO:652), IVVVPAAM (SEQ ID NO:653), DIVVVPAAM (SEQ ID NO: 11), CSGGSC (SEQ ID NO:654), CSGGSCY (SEQ ID NO 655), YCSGGSC (SEQ ID NO:656), CSGGSCYS (SEQ ID NO 657), GYCSGGSC (SEQ ID NO:658), YCSGGSCY (SEQ ID NO:659), GYCSGGSCY (SEQ ID NO:660), YCSGGSCYS (SEQ ID NO:661), GYCSGGSCYS (SEQ ID NO: 16), FGV, GVV, IFG, ITI, TIF, VVI, FGVV (SEQ ID NO: 662), GVVI (SEQ ID NO: 663), IFGV (SEQ ID NO: 644), ITIF (SEQ ID NO: 665), TIFG (SEQ ID NO:666), VVII (SEQ ID NO: 667), FGVVI (SEQ ID NO:668), GVVII (SEQ ID NO: 669), IFGVV (SEQ ID NO:670), ITIFG (SEQ ID NO: 671), TIFGV (SEQ ID NO 672), FGVVII (SEQ ID NO:673), IFGVVI (SEQ ID NO:674), ITIFGV (SEQ ID NO:675), TIFGVV(SEQ ID NO:676), IFGVVI (SEQ ID NO:677), ITIFGVV (SEQ ID NO: 678), TIFGVVI (SEQ ID NO: 679), ITIFGVVI (SEQ ID NO: 680), TIFGVVII (SEQ ID NO 681), ITIFGVVII (SEQ ID NO: 9), ELL, FGE, GEL, LLW, LWF, VLL, WFG, FGEL (SEQ ID NO: 682), GELL (SEQ ID NO: 683), LLWF (SEQ ID NO: 684), LWFG (SEQ ID NO: 685), VLLW (SEQ ID NO:686), WFGE (SEQ ID NO: 687), FGELL (SEQ ID NO: 688), LLWFG (SEQ ID NO: 689), LWFGE (SEQ ID NO: 690), VLLWF (SEQ ID NO: 691), WFGEL (SEQ ID NO 692), LLWFGE (SEQ ID NO: 693), LWFGEL (SEQ ID NO: 694), VLLWFG (SEQ ID NO: 695), WFGELL (SEQ ID NO: 696), LLWFGEL (SEQ ID NO: 697), LWFGELL (SEQ ID NO:698), VLLWFGE (SEQ ID NO: 699), LLWFGELL (SEQ ID NO: 700), VLLWFGEL (SEQ ID NO: 701), VLLWFGELL (SEQ ID NO: I), GSG, GSY, SGS, SYY, YGS, YYG, YYN, YYY, GSGS (SEQ ID NO:702), GSYY (SEQ ID NO: 703), SGSY (SEQ ID NO: 704), SYYN (SEQ ID NO: 705), YGSG (SEQ ID NO: 706), YYGS (SEQ ID NO: 707), YYYG (SEQ ID NO 708), GSGSY (SEQ ID NO: 709), GSYYN (SEQ ID NO 710), SGSYY (SEQ ID NO:711), YGSGS (SEQ ID NO: 712), YYGSG (SEQ ID NO: 713), YYYGS (SEQ ID NO: 714), GSGSYY (SEQ ID NO: 715), SGSYYN (SEQ ID NO:716), YGSGSY (SEQ ID NO: 717), YYGSGS (SEQ ID NO: 718), YYYGSG (SEQ ID NO:719), GSGSYYN (SEQ ID NO: 720), YGSGSYY (SEQ ID NO: 721), YYGSGSY (SEQ ID NO: 722), YYYGSGS (SEQ ID NO:723), YGSGSYYN (SEQ ID NO:724), YYGSGSYY (SEQ ID NO:725), YYYGSGSY (SEQ ID NO:726), YYGSGSYYN (SEQ ID NO: 727), YYYGSGSYY (SEQ ID NO: 728), YYYGSGSYYN (SEQ ID NO: 2), GVI, ITM, MVR, RGV, TMV, VII, VRG, GVII (SEQ ID NO: 729), ITMV (SEQ ID NO: 730), MVRG (SEQ ID NO: 731), RGVI (SEQ ID NO: 732), TMVR (SEQ ID NO: 733), VRGV (SEQ ID NO: 734), ITMVR (SEQ ID NO: 735), MVRGV (SEQ ID NO: 736), RGVII (SEQ ID NO:737), TMVRG (SEQ ID NO:738), VRGVI (SEQ ID NO:739), ITMVRG (SEQ ID NO: 740), MVRGVI (SEQ ID NO:741), TMVRGV (SEQ ID NO:742), VRGVII (SEQ ID NO: 743), ITMVRGV (SEQ ID NO: 744), MVRGVII (SEQ ID NO: 745), TMVRGVI (SEQ ID NO: 746), ITMVRGVI (SEQ ID NO: 747), TMVRGVII (SEQ ID NO: 748), ITMVRGVII (SEQ ID NO: 3), DSS, GYY, SGY, SSG, YDS, YYD, DSSG (SEQ ID NO: 749), GYYY (SEQ ID NO: 750), SGYY (SEQ ID NO: 751), SSGY (SEQ ID NO: 752), YDSS (SEQ ID NO: 753), YYDS (SEQ ID NO: 754), YYYD (SEQ ID NO: 755), DSSGY (SEQ ID NO: 756), SGYYY (SEQ ID NO: 757), SSGYY (SEQ ID NO: 758), YDSSG (SEQ ID NO: 759), YYDSS (SEQ ID NO: 760), YYYDS (SEQ ID NO: 761), DSSGYY (SEQ ID NO: 762), SSGYYY (SEQ ID NO: 763), YDSSGY (SEQ ID NO: 764), YYDSSG (SEQ ID NO: 765), YYYDSS (SEQ ID NO: 766), DSSGYYY (SEQ ID NO: 767), YDSSGYY (SEQ ID NO: 768), YYDSSGY (SEQ ID NO: 769), YYYDSSG (SEQ ID NO: 770), YDSSGYYY (SEQ ID NO: 771), YYDSSGYY (SEQ ID NO: 772), YYYDSSGY (SEQ ID NO: 773), YYDSSGYYY (SEQ ID NO: 774), YYYDSSGYY (SEQ ID NO: 775), YYYDSSGYYY (SEQ ID NO: 4), DGY, GDY, YGD, DYGD (SEQ ID NO: 613), YGDY (SEQ ID NO: 614), DYGDY (SEQ ID NO: 12), SYG, YGY, YSY, GYSY (SEQ ID NO: 776), SYGY (SEQ ID NO: 777), YSYG (SEQ ID NO: 778), GYSYG (SEQ ID NO: 779), YSYGY (SEQ ID NO: 780), GYSYGY (SEQ ID NO: 15), SSS, SSW, SWY, SSSW (SEQ ID NO: 781), SSWY (SEQ ID NO: 782), YSSS (SEQ ID NO: 783), GYSSS (SEQ ID NO: 784), SSSWY (SEQ ID NO: 785), YSSSW (SEQ ID NO: 786), GYSSSW (SEQ ID NO: 787), YSSSWY (SEQ ID NO: 788), GYSSSWY (SEQ ID NO: 7), GWY, GYS, SGW, YSS, GYSS (SEQ ID NO: 789), SGWY (SEQ ID NO: 790), SSGW (SEQ ID NO: 791), YSSG (SEQ ID NO: 792), GYSSG (SEQ ID NO: 793), SSGWY (SEQ ID NO: 794), YSSGW (SEQ ID NO: 795), GYSSGW (SEQ ID NO: 796), YSSGWY (SEQ ID NO: 797), GYSSGWY (SEQ ID NO: 5), AVA, GIA, IAV, VAG, AVAG (SEQ ID NO: 798), GIAV (SEQ ID NO: 799), IAVA (SEQ ID NO: 800), GIAVA (SEQ ID NO: 801), IAVAG (SEQ ID NO: 802), GIAVAG (SEQ ID NO: 6), AAA, AAG, IAA, AAAG (SEQ ID NO: 803), GIAA (SEQ ID NO: 804), IAAA (SEQ ID NO: 805), GIAAA (SEQ ID NO: 806), IAAAG (SEQ ID NO: 807), and GIAAAG (SEQ ID NO: 8).

15. The method of claim 1 , wherein the H3-JH segment is about 2 to about 9 amino acids in length.

16. The method of claim 1 , wherein the H3-JH segment is selected from the group consisting of AEYFQH (SEQ ID NO: 17), EYFQH (SEQ ID NO: 583), YFQH (SEQ ID NO: 584), FQH, QH, H, YWYFDL (SEQ ID NO: 18), WYFDL (SEQ ID NO: 585), YFDL (SEQ ID NO: 586), FDL, DL, L, AFDV (SEQ ID NO: 19), FDV, DV, V, YFDY (SEQ ID NO: 20), FDY, DY, Y, NWFDS (SEQ ID NO: 21), WFDS (SEQ ID NO: 587), FDS, DS, S, YYYYYGMDV (SEQ ID NO: 22), YYYYGMDV (SEQ ID NO: 588), YYYGMDV (SEQ ID NO: 589), YYGMDV (SEQ ID NO: 590), YGMDV (SEQ ID NO: 591), GMDV (SEQ ID NO: 592), MDV, AFDI (SEQ ID NO: 852), FDI, DI, NWFDP (SEQ ID NO: 857), WFDP (SEQ ID NO: 858), FDP, and DP.

17. The method of claim 1 , wherein the progressive deletion of one or more amino acids from either or both of the N-terminus and C-terminus of the DH segment amino acid sequence maintains any disulfide loop.

18. The method of claim 1 , further comprising mutagenizing one or more of the provided N1, DH, N2, and H3-JH segments.

19. The method of claim 18 , wherein mutagenizing includes one or more of site-directed mutagenesis, error-prone PCR mutagenesis, cassette mutagenesis, and random PCR mutagenesis.