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- W2022345092 abstract "A sequence-specific DNA-binding antibody was previously generated by incorporating a 17 amino acid alpha-helix from the DNA-binding domain of the transcription factor TFEB into the HCDR3 site of a recombinant human Fab fragment. The recombinant DNA-binding antibody, called Fab-E box, binds the TFEB recognition sequence CACGTG (an E box site) with a 5-10-fold lower affinity than TFEB. Here, we have determined the precise kinetics of interaction of Fab-E box with DNA and show that the lower affinity of Fab-E box relative to TFEB for E box DNA is due to a higher dissociation rate. DNase I protection assays show Fab-E box physically interacts with one half-site of the E box. Additional DNA target sites of Fab-E box were identified by DNase I protection assays. A compilation of these binding sites indicates that the recognition elements for Fab-E box binding include a half-site of the E box, CAW, with an 8 bp consensus sequence identified as YNYYCAWW. Thus, the DNA determinants for Fab-E box recognition extend beyond one-half site of the E box sequence, with preferences for pyrimidines and A+T-rich sequences in the 5' and 3' outer regions of the binding site, respectively. Apparent dissociation constants of Fab-E box for a subset of these target DNA sequences are 5-10-fold greater than the DNA-binding affinity of the antibody with the E box site. Therefore, these results identify important DNA specificity determinants for high-affinity binding by Fab-E box." @default.
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- W2022345092 date "1998-04-01" @default.
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- W2022345092 title "Recognition Properties of a Sequence-Specific DNA Binding Antibody" @default.
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- W2022345092 doi "https://doi.org/10.1021/bi9730792" @default.
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