FCgammaRIIB-SPECIFIC FC REGION VARIANT
First Claim
1. An Fc region variant in which amino acid at position 238 according to EU numbering and at least one amino acid selected from those at positions 233, 234, 235, 237, 264, 265, 266, 267, 268, 269, 271, 272, 274, 296, 326, 327, 330, 331, 332, 333, 334, 355, 356, 358, 396, 409, and 419 according to EU numbering are altered to other amino acids, wherein binding activity of the variant to Fcγ
- receptors [KD value for Fcγ
RIIb of a polypeptide comprising an Fc region to which an amino acid alteration(s) has not been introduced]/[KD value for Fcγ
RIIb of a polypeptide comprising the Fc region variant] has a value which is 15.0 or greater.
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Abstract
An objective of the present invention is to provide an Fc region variant with enhanced FcγRIIb-binding activity, and/or enhanced binding selectivity to FcγRIIb compared to FcγRIIa (type R), as compared to those of a polypeptide containing an Fc region to which an amino acid alteration(s) has not been introduced; a polypeptide which includes the Fc region variant; a pharmaceutical composition containing the polypeptide; preventing therapeutic or preventive agent for immunological inflammatory diseases that includes the pharmaceutical composition; a production method thereof; and a method of enhancing FcγRIIb-binding activity and also enhancing binding selectivity to FcγRIIb compared to FcγRIIa (type R).
It was found that a polypeptide containing an antibody Fc region variant that contains an amino acid sequence in which an amino-acid alteration at position 238 (EU numbering) is combined with other specific amino-acid alterations enhances FcγRIIb-binding activity, and/or enhances binding selectivity to FcγRIIb compared to FcγRIIa (type R).
26 Citations
19 Claims
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1. An Fc region variant in which amino acid at position 238 according to EU numbering and at least one amino acid selected from those at positions 233, 234, 235, 237, 264, 265, 266, 267, 268, 269, 271, 272, 274, 296, 326, 327, 330, 331, 332, 333, 334, 355, 356, 358, 396, 409, and 419 according to EU numbering are altered to other amino acids, wherein binding activity of the variant to Fcγ
- receptors [KD value for Fcγ
RIIb of a polypeptide comprising an Fc region to which an amino acid alteration(s) has not been introduced]/[KD value for Fcγ
RIIb of a polypeptide comprising the Fc region variant] has a value which is 15.0 or greater. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19)
- receptors [KD value for Fcγ
-
3. An Fc region variant whose amino acid at position 238 according to EU numbering is Asp, and which comprises at least one amino acid selected from the amino acid group consisting of Asp at amino acid position 233, Tyr at amino acid position 234, Phe at amino acid position 235, Asp at amino acid position 237, Ile at amino acid position 264, Glu at amino acid position 265, Phe, Leu, or Met at amino acid position 266, Ala, Glu, Gly, or Gin at amino acid position 267, Asp, Gln, or Glu at amino acid position 268, Asp at amino acid position 269, Gly at amino acid position 271, Asp, Phe, Ile, Met, Asn, Pro, or Gln at amino acid position 272, Gin at amino acid position 274, Asp or Phe at amino acid position 296, Ala or Asp at amino acid position 326, Gly at amino acid position 327, Lys, Arg, or Ser at amino acid position 330, Ser at amino acid position 331, Lys, Arg, Ser, or Thr at amino acid position 332, Lys, Arg, Ser, or Thr at amino acid position 333, Arg, Ser, or Thr at amino acid position 334, Ala or Gln at amino acid position 355, Glu at amino acid position 356, Met at amino acid position 358, Ala, Asp, Glu, Phe, Gly, His, Ile, Lys, Leu, Met, Asn, Gln, Arg, Ser, Thr, Val, Trp, or Tyr at amino acid position 396, Arg at amino acid position 409, and Glu at amino acid position 419, wherein binding activity of the variant to Fcγ
- receptors [KD value for Fcγ
RIIb of a polypeptide comprising an Fc region to which an amino acid alteration(s) has not been introduced]/[KD value for Fcγ
RIIb of a polypeptide comprising the Fc region variant] has a value which is 15.0 or greater. - View Dependent Claims (4)
- receptors [KD value for Fcγ
-
11. An Fc region variant consisting of any one amino acid sequence selected from among SEQ ID NOs:
- 43 to 68, SEQ ID NO;
70, SEQ ID NO;
71, and SEQ ID NOs;
75 to 77.
- 43 to 68, SEQ ID NO;
Specification