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An analysis of DNA-protein interactions was carried out using all DNA-protein complexes in the protein data bank (PDB). The frequency distribution of four amino acid residues, represented as P, Q, R and S, occurring in non-covalent interactions between the protein and DNA backbone is shown below.

Which one of the following is correct?

  1. P-Lys, Q-Arg, R-Gln, S-Glu
  2. P-Gln, Q-Glu, R-Lys, S-Arg
  3. P-Asn, Q-Asp, R-Arg, S-Lys
  4. P-His, Q-Glu, R-Gln, S-Lys
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according to the PDGs analysis of the DNA Protein is A
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