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- W1489338305 abstract "Abstract To experimentally examine the functional roles of somatically derived structural variation in the lysozyme-binding mAb HyHEL-10, we have introduced three different point mutations and one insertion at two different sites in HyHEL-10 by site-directed mutagenesis and expression of the mutant antibodies. Mutation of Asp----Ala at position 101 of the H chain returns a somatically mutated residue to its germline sequence for HyHEL-10, and reduces affinity for chicken lysozyme by approximately 9000-fold. Lengthening the third H chain hypervariable region by two amino acids reduces affinity by about 2000-fold. Two mutations, Asp----Thr at position 101 in the H chain and Lys----Thr at position 49 in the L chain, model somatic differences found in another structurally related but functionally distinguishable mAb and minimally decrease affinity for chicken lysozyme. The H chain mutation Asp101VVH----Thr has little effect on affinity for other avian lysozymes but does alter relative fine specificity for these lysozymes. The L chain mutation Lys49VK----Thr increases affinity for duck lysozyme by approximately fivefold. Neither of the positions mutated, 101 in the H chain nor 49 in the L chain, nor the residues near the insertion contact lysozyme in the x-ray structure of the HyHEL-10 F(ab)-HEL complex. The results suggest that these mutations, which model observed somatic mutations, produce functional variation by indirect or long-range effects." @default.
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- W1489338305 date "1992-01-15" @default.
- W1489338305 modified "2023-10-17" @default.
- W1489338305 title "Experimental analysis by site-directed mutagenesis of somatic mutation effects on affinity and fine specificity in antibodies specific for lysozyme." @default.
- W1489338305 doi "https://doi.org/10.4049/jimmunol.148.2.503" @default.
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