期刊
ACS CHEMICAL BIOLOGY
卷 8, 期 2, 页码 368-375出版社
AMER CHEMICAL SOC
DOI: 10.1021/cb300455f
关键词
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资金
- Clayton Foundation
- Cancer Prevention and Research Institute of Texas
- new faculty research program of Kookmin University in Korea
- Norwegian Research Council [179573/V40]
- South-Eastern Norway Regional Health Authority [39375]
Glycans anchored to residue N297 of the antibody IgG Fc domain are critical in mediating binding toward Fc gamma Rs to direct both adaptive and innate immune responses. However, using a full length bacterial IgG display system, we have isolated aglycosylated Fc domains with mutations that confer up to a 160-fold increase in the affinity toward the low affinity Fc gamma RIIa-R131 allele as well as high selectivity against binding to the remarkably homologous human inhibitory receptor, Fc gamma RIIb. The mutant Pc domain (AglycoT-Fc1004) contained a total of 5 amino acid substitutions that conferred an activating to inhibitory ratio of 25 (A/I ratio; FcyRIIa-R131:Fc gamma RIIb). Incorporation of this engineered Fc into trastuzumab, an anti-Her2 antibody, resulted in a 75% increase in tumor cell phagocytosis by macrophages compared to that of the parental glycosylated trastuzumab with both medium and low Her2-expressing cancer cells. A mathematical model has been developed to help explain how receptor affinity and the A/I ratio relate to improved antibody dependent cell-mediated phagocytosis. Our model provides guidelines for the future engineering of Fc domains with enhanced effector function.
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