ARGININE POLYPEPTIDES-HISTONE ANALOGUES. SYNTHESIS CONFORMATIONAL STUDIES AND THEIR INTERACTIONS WITH NUCLEIC ACID (DNA). CIRCULAR DICHROISM SPECTROSCOPY
Abstract
SEQUENTIAL POLYPEPTIDES (L-ARG-X-GLY)N WHERE X REPRESENTS THE AMINO ACID RESIDUES L-ILE, NVA, NLE WERE PREPARED AS SYNTHETIC MODELS OF ARGININE RICH HISTONES.USING CIRCULAR DICHROISM SPECTROSCOPY WE STUDIED: A) THE POLYPEPTIDES CONFORMATIONAL PROPERTIES IN RELATION TO THE NATURE OF THE X RESIDUE SIDE CHAIN (LENGTH, BRANCHING) AND THE SURROUNDING MEDIUM (AQUEOUS, ORGANIC, AMPHIPHILIC) AND B) THE POLYPEPTIDE-NUCLEIC ACID SPECIFIC ASSOCIATIONS. IT WAS FOUND THAT THE ABSENCE OF "B-BRANCHING" WHEN WE REFER TO THE SAME ALKYL GROUP (-C4H9), FAVORS, THE POLYPEPTIDE BACKBONE FOLDING AND THE DNA CONDENSATION, WHILE THE LACK OF ONE -CH2 GROUP AND "B-BRANCHING" INCREASES THE CONFORMATIONAL ORDERING AND THE DNA CONDENSATION AS IT WAS FOUND IN CHROMATIN.
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