Anti-CD22 single domain antibodies and therapeutic constructs
Herein are provided anti-CD22 single domain antibodies (sdAb) prepared by immunizing a llama with the extracellular domain of the predominant human CD22 isoform. By constructing a library of the heavy chain repertoire generated, VHH antibodies specific to the immunogen were isolated. The 27 example antibodies initially produced comprise CDR1, CDR2, and CDR3 sequences corresponding, respectively to SEQNOs: 1-3, 4-6, 7-9, 10-12, 13-15, 16-18, 19-21, 22-24, 25-27, 28-30, 31-33, 34-36, 37-39, 40-42, 43-45, 46-48, 49-51, 52-54, 55-57, 58-60, 61-63, 64-66, 67-69, 70-72, 73-75, 75-78, and 79-81; and related sequences. Also provided are multivalent antibodies comprising any one of the sdAbs, including bispecific T-cell engagers, bispecific killer cell engagers (BiKEs), and trispecific killer cell engagers (TrikEs). Also described are chimeric antigen receptors (CARs) for CAR-T therapy comprising any one of the aforementioned sdAbs. Uses of these molecules in the treatment of cancer are also described.
1 . An isolated single domain antibody (sdAb), which binds specifically to human CD22, the sdAb comprising:
i) a CDR1 amino acid sequence as set forth in SEQ ID NO: 1, a CDR2 amino acid sequence as set forth in SEQ ID NO: 2, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 3,
ii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 4, a CDR2 amino acid sequence as set forth in SEQ ID NO: 5, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 6,
iii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 7, a CDR2 amino acid sequence as set forth in SEQ ID NO: 8, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 9,
iv) a CDR1 amino acid sequence as set forth in SEQ ID NO: 10, a CDR2 amino acid sequence as set forth in SEQ ID NO: 11, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 12,
v) a CDR1 amino acid sequence as set forth in SEQ ID NO: 13, a CDR2 amino acid sequence as set forth in SEQ ID NO: 14, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 15,
vi) a CDR1 amino acid sequence as set forth in SEQ ID NO: 16, a CDR2 amino acid sequence as set forth in SEQ ID NO: 17, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 18,
vii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 19, a CDR2 amino acid sequence as set forth in SEQ ID NO: 20, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 21,
viii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 22, a CDR2 amino acid sequence as set forth in SEQ ID NO: 23, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 24,
ix) a CDR1 amino acid sequence as set forth in SEQ ID NO: 25, a CDR2 amino acid sequence as set forth in SEQ ID NO: 26, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 27,
x) a CDR1 amino acid sequence as set forth in SEQ ID NO: 28, a CDR2 amino acid sequence as set forth in SEQ ID NO: 29, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 30,
xi) a CDR1 amino acid sequence as set forth in SEQ ID NO: 31, a CDR2 amino acid sequence as set forth in SEQ ID NO: 32, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 33,
xii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 34, a CDR2 amino acid sequence as set forth in SEQ ID NO: 35, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 36,
xiii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 37, a CDR2 amino acid sequence as set forth in SEQ ID NO: 38, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 39,
xiv) a CDR1 amino acid sequence as set forth in SEQ ID NO: 40, a CDR2 amino acid sequence as set forth in SEQ ID NO: 41, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 42,
xv) a CDR1 amino acid sequence as set forth in SEQ ID NO: 43, a CDR2 amino acid sequence as set forth in SEQ ID NO: 44, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 45,
xvi) a CDR1 amino acid sequence as set forth in SEQ ID NO: 46, a CDR2 amino acid sequence as set forth in SEQ ID NO: 47, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 48,
xvii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 49, a CDR2 amino acid sequence as set forth in SEQ ID NO: 50, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 51,
xviii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 52, a CDR2 amino acid sequence as set forth in SEQ ID NO: 53, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 54,
xix) a CDR1 amino acid sequence as set forth in SEQ ID NO: 55, a CDR2 amino acid sequence as set forth in SEQ ID NO: 56, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 57,
xx) a CDR1 amino acid sequence as set forth in SEQ ID NO: 58, a CDR2 amino acid sequence as set forth in SEQ ID NO: 59, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 60,
xxi) a CDR1 amino acid sequence as set forth in SEQ ID NO: 61, a CDR2 amino acid sequence as set forth in SEQ ID NO: 62, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 63,
xxii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 64, a CDR2 amino acid sequence as set forth in SEQ ID NO: 65, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 66,
xxiii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 67, a CDR2 amino acid sequence as set forth in SEQ ID NO: 68, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 69,
xxiv) a CDR1 amino acid sequence as set forth in SEQ ID NO: 70, a CDR2 amino acid sequence as set forth in SEQ ID NO: 71, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 72,
xxv) a CDR1 amino acid sequence as set forth in SEQ ID NO: 73, a CDR2 amino acid sequence as set forth in SEQ ID NO: 74, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 75,
xxvi) a CDR1 amino acid sequence as set forth in SEQ ID NO: 76, a CDR2 amino acid sequence as set forth in SEQ ID NO: 77, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 78, or
xxvii) a CDR1 amino acid sequence as set forth in SEQ ID NO: 79, a CDR2 amino acid sequence as set forth in SEQ ID NO: 80, and a CDR3 amino acid sequence as set forth in SEQ ID NO: 81.
2 . The isolated sdAb of claim 1 , comprising A) the amino acid sequence of any one of SEQ ID NO: 85 to 112 and 120 to 125, or B) an amino acid sequence that is at least 80% identical to any one of SEQ ID NO: 82 to 108 and 120 to 125 across the full length thereof.
3 . The isolated sdAb of claim 1 , comprising A) the amino acid sequence of any one of SEQ ID NO: 82 to 108 and 120 to 125.
4 . The isolated sdAb of claim 1 , which is a camelid sdAb.
5 . The isolated sdAb of claim 4 , which is a llama sdAb.
6 . The isolated sdAb of claim 1 , which is a humanized sbAb of llama origin.
7 . A recombinant polypeptide comprising one or more than one sdAb as defined in claim 1 .
8 . A multivalent antibody comprising:
a first antigen-binding portion comprising the sdAb as defined in claim 1 , and a second antigen-binding portion.
9 . The multivalent antibody of claim 8 , wherein the second antigen-binding portion binds specifically to a cell-surface marker of a natural killer (NK) cell.
10 . The multivalent antibody of claim 8 , wherein the sdAb comprises:
a CDR1 amino acid sequence as set forth in SEQ ID NO: 13,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 14, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 15; or
a CDR1 amino acid sequence as set forth in SEQ ID NO: 7,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 8, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 9.
11 . The multivalent antibody of claim 8 , wherein the sdAb comprises SEQ ID NO: 86 or SEQ ID NO: 84.
12 . A method of treating a CD22-expressing cancer in a subject comprising administering to the subject the multivalent antibody as defined in claim 8 .
13 . A chimeric antibody receptor (CAR), which binds to human CD22, comprising the VHH sdAb as defined in claim 1 .
14 . The CAR of claim 13 , wherein the sdAb comprises SEQ ID NO: 86, SEQ ID NO: 83, SEQ ID NO: 87, SEQ ID NO: 82, SEQ ID NO: 88, SEQ ID NO: 85, SEQ ID NO: 102, or SEQ ID NO: 84.
15 . The CAR claim 13 , where in the VHH sdAb comprises:
a CDR1 amino acid sequence as set forth in SEQ ID NO: 4,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 5, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 6;
a CDR1 amino acid sequence as set forth in SEQ ID NO: 13,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 14, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 15;
a CDR1 amino acid sequence as set forth in SEQ ID NO: 19,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 20, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 21;
a CDR1 amino acid sequence as set forth in SEQ ID NO: 61,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 62, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 63; or
a CDR1 amino acid sequence as set forth in SEQ ID NO: 1,
a CDR2 amino acid sequence as set forth in SEQ ID NO: 2, and
a CDR3 amino acid sequence as set forth in SEQ ID NO: 3.
16 . A recombinant nucleic acid molecule encoding the CAR as defined in claim 13 .
17 . An engineered cell expressing at the cell surface membrane the CAR as defined in claim 13 .
18 . A method of treating a CD22-expressing cancer in a subject, comprising administering to the subject the engineered cell as defined in claim 17 .
19 . The method of claim 12 , wherein the cancer is a hematological malignancy.
20 . The method of claim 18 , wherein the cancer is a hematological malignancy.