Antibodies that bind hK-1

An antibody comprising an immunoglobulin heavy chain (HC) variable domain sequence and an immunoglobulin light chain (LC) variable domain sequence, wherein the HC variable domain sequence and the LC variable domain sequence form an antigen binding site that binds to hK1 and inbibits enzymatic activity of hK1 (SEQ ID NO:1021) with a Ki of less than 10 nM, said HC variable domain sequence having:

• a CDR1 that comprises an amino acid sequence:
• Xaa1-Tyr-Xaa2-Met-Xaa3 (SEQ ID NO:31), wherein Xaa 1 is selected from Lys and His;
• Xaa2 is selected from Lys, Val and Ser;
• Xaa3 is selected from Val, Ile and Thr;
• a CDR2 that comprises an amino acid sequence:
• Xaa1-Ile-Tyr-Pro-Ser-Gly-Gly-Xaa2-Thr-Xaa3-Tyr-Ala-Asp-Ser-Val-Lys-Gly (SEQ ID NO:32), wherein Xaa1 is selected from Ser, Trp and Arg;
• Xaa2 is selected from Ile, Asn and Arg;
• Xaa3 is selected from Ala, Ile and Gly;
• and
• a CDR3 that comprises the sequence at DITPGGGSGFRLPKNYYYYGMDV (SEQ ID NO:12);
• and
• said LC variable domain sequence having:
• a CDR1 that comprises an amino acid sequence:
• Arg-Ala-Ser-Gln-Ser-Xaa1-Ser-Ser-Xaa2-Xaa3-Xaa4-Xaa5 (SEQ ID NO:284), wherein Xaa1 is selected from Ile and Val;
• Xaa2 is selected from Tyr and Ser;
• Xaa3 is selected from Leu and Tyr;
• Xaa4 is selected from Asn, Ala and Leu;
• and Xaa5 is Ala or is absent;
• a CDR2 that comprises an amino acid sequence:
• Xaa1-Ala-Ser-Xaa2-Xaa3-Xaa4 (SEQ ID NO:314), wherein Xaa1 is selected from Ala,Asp and Gly;
• Xaa2 is selected from Ser and Asn;
• Xaa3 is selected from Leu and Arg;
• Xaa4 is selected from Gln, Ala, Ser and Thr;
• and
• a CDR3 that comprises the sequence QQSYSTPLT (SEQ ID NO:9).