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Antibodies with Enhanced or Suppressed Effector Function

a technology of effector function and antibody, which is applied in the field of antibodies, fusion proteins and polypeptides, can solve the problems of not removing foreign antigens, not evenly distributed variability through the variable domains of antibodies, and previous studies failing to describe the effect of simultaneous changes to multiple amino acids, etc., to achieve less binding and higher selectivity in binding

Inactive Publication Date: 2013-05-02
ZYMEWORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The approach results in polypeptides with enhanced binding specificity and affinity to specific Fcγ receptors, potentially improving therapeutic outcomes by optimizing effector functions such as ADCC and immune response modulation.

Problems solved by technology

However, the variability is not evenly distributed through the variable domains of antibodies.
While binding of an antibody to the requisite antigen has a neutralizing effect that might prevent the binding of a foreign antigen to its endogenous target (e.g. receptor or ligand), binding alone may not remove the foreign antigen.
Although the effect of individual Fc region amino acid mutations on the binding with certain Fey receptors is well understood, previous studies fail to describe the effect of simultaneous changes to multiple amino acids.
Additionally, the prior art does not suggest suitable replacements for substituted Fc region amino acids to obtain optimal binding to the FcγR of interest, including modification of effector function of a wild type molecule that already has detectable effector function.

Method used

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  • Antibodies with Enhanced or Suppressed Effector Function
  • Antibodies with Enhanced or Suppressed Effector Function
  • Antibodies with Enhanced or Suppressed Effector Function

Examples

Experimental program
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Effect test

example 1

Illustration Of Rational Design Of Polypeptides Having A Combination Of Mutations Selected For Producing Selected FcγR Binding Profile

[0212]Antibodies targeting the HER2 / neu receptor:

[0213]The Human Epidermal growth factor Receptors (HERs) are proteins embedded in the cell membrane and communicate molecular signals from outside the cell to inside the cell, and turn genes on and off. The HER proteins regulate cell growth, survival, adhesion, migration, and differentiation—functions that are amplified or weakened in cancer cells. Human Epidermal growth factor Receptor 2″—a member of the epidermal growth factor receptor family, is a protein giving higher aggressiveness in breast cancers. HER2 / neu has also been designated as CD340. Approximately 15-20 percent of breast cancers have an amplification of the HER2 / neu gene or overexpression of its protein product. Overexpression of this receptor in breast cancer is associated with increased disease recurrence and worse prognosis. Because of...

example 2

In Vitro And Ex Vivo Validation Of Designed Antibodies

[0221]Once designed in silico individual antibodies are tested according to the methods described in Stavenhagen et al. (2007) Cancer Res. 67:882 and Stavenhagen et al. (2008), Adv. Enzyme Regal., 48:152.

[0222]Briefly, the gene for each mutant is constructed by standard chemical synthesis using, for example, Trastuzumab IgG1 as the wild-type framework. After cloning into a suitable vector, the mutant Fc polypeptides are expressed in mammalian HEK293 cells. The FcγRIIa, FcγRIIb and FcγRIIIa are also cloned and expressed in HEK293 cells. The binding affinities of the antibodies to each of the three receptors is then determined by surface plasmon resonance.

[0223]Surface Plasmon Resonance Analysis: Surface Plasmon Resonance Analysis: Affinity of Fcγ receptors to antibody Fc was measure by SPR (surface Plasmon resonance) using a ProteOn XPR36 system from BIO-RAD. HER-2 in buffer (10 mM Hepes pH 6.8) was immobilized on CM5 chip through...

example 3

[0228]Additional antibodies comprising modifications based on the in silico methods described above are summarized in Table 2.

TABLE 2in silico ΔΔG solv [kcal / mol]IIIa (F)IIIa (V)IIa (H)IIa (R)IIb (F)IIb (Y)Mutations Compared to WildtypevariantvariantvariantvariantvariantvariantWildtype Trastuzumab++++++++++++++++++L235YG236A———+++++++L235FG236A———+++++++++++++G236AD270E———+++++++++G236AD270L———++++++++H268FD270E———++++++++++++++G236DD270E———+++++++S239DD270L———++++++++++++++++++++++++++++++S239DD270K———+++++++++++++++++++++++++++++D270EY300L———+++++++++++++++D270ES298A———++++++++++++++++++++ ++++ −5 to −2 kcal / mol;+++ Between −2 and 2 kcal / mol;++ 2 to 5 kcal / mol;+ >5 kcal / molNB: no binding;ND: Not Determined

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Abstract

Rationally designed antibodies and polypeptides that comprise two Fc region amino acid substitutions that synergistically provide enhanced selectivity and binding affinity to a target Fc receptor are provided. The polypeptides comprise Fc region mutations at two positions that synergistically make the polypeptides more effective when incorporated in antibody therapeutics than those having wild-type Fc components.

Description

CROSS-REFERENCE[0001]This application claims priority to U.S. Provisional Application No. 61 / 436,584, filed Jan. 26, 2011, and U.S. Provisional Application No. 61 / 318,583, filed Mar. 29, 2010. The contents of both provisional applications are incorporated in their entirety by reference herein.FIELD OF INVENTION[0002]The present invention relates to antibodies, fusion proteins and polypeptides. Specifically, the instant invention relates to rationally designed antibodies and polypeptides that comprise Fc region amino acid substitutions that synergistically provide enhanced selectivity and binding affinity to a target Fc receptor.BACKGROUND OF THE INVENTION[0003]Antibodies are proteins which exhibit binding specificity to a specific antigen. Native antibodies are usually heterotetrameric glycoproteins of about 150,000 daltons, composed of two identical light (L) chains and two identical heavy (H) chains. Each light chain is linked to a heavy chain by one covalent disulfide bond, while...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07K16/28G16B15/30
CPCC07K14/70535C07K2317/52C07K2317/72C07K2317/732C07K2317/92C07K16/283C07K16/28C07K16/2851C07K16/2887C07K16/464G06F19/16C07K16/00C07K2317/24C07K2317/524G16B15/00C07K16/32A61P29/00A61P35/00A61P37/00G16B15/30C07K16/082C07K16/2803C07K2317/76
Inventor D'ANGELO, IGORBLEILE, DUSTINTOM-YEW, STACEY A.L.ESCOBAR-CABRERA, ERICLARIO, PAULA I.OHRN, ANDERSPOON, DAVID K.Y.DIXIT, SURJIT B.
Owner ZYMEWORKS INC
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