Abstract
To isolate the DNA fragments bound to cell-surface proteins with high affinity, peptide-DNA complexes were obtained by mild treatment of human endothelial cells with trypsin. After binding of nucleoprotein complexes to BrCN-Sepharose and extensive washing, 7-11 nt DNA fragments were eluted with acidic buffer, labeled with (32)P, and isolated by PAGE. The fragments were ligated to double-stranded oligonucleotide adapters, amplified by PCR, and cloned in pBluescript II KS (+) vector. Sequences of 12 clones containing the insert of cell-surface-bound 7-11-mer DNA fragments were obtained.
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