Nucleopeptides represent an intriguing class of nucleic acid analogues, in which nucleobases are placed in a peptide structure. The incorporation of D- and/or L-amino acids in nucleopeptide molecules allows the investigation of the role of backbone stereochemistry in determining the formation of DNA and RNA hybrids. Circular Dichroism (CD) spectroscopic studies indicated the nucleopeptide as having fully l-backbone configuration-formed stable hybrid complexes with RNA molecules. Molecular Dynamics (MD) simulations suggested a potential structure of the complex resulting from the interaction between the l-nucleopeptide and RNA strand. From this study, both the backbone (ionics and H-bonds) and nucleobases (pairing and π-stacking) of the chiral nucleopeptide appeared to be involved in the hybrid complex formation, highlighting the key role of the backbone stereochemistry in the formation of the nucleopeptide/RNA complexes.
A Practical Route to Partially Protected Pyrrolidines as Precursors for the Stereoselective Synthesis of Alexines.-A key intermediate (X) for the synthesis of alkaloids like the type of alexines and others is prepared in a very efficient way.-(IZQUIERDO CUBERO, ISIDORO; PLAZA LOPEZ-ESPINOSA, MARIA T.; ROBLES DIAZ, RAFAEL; MONTALBAN, FRANCISCO FRANCO; Carbohydr. Res. 330 (2001) 3, 401-408; Dep. Quim.
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