Lili Arabuli1, R Jezek2, P Lovecka2, T Macek2, T Ruml2, J Viktorova2 and E Nikoleishvili1 1 University of Georgia, Georgia 2 University of Chemistry and Technology, Czech Republic
The most advantage of the macrocyclic polyamines is their unique capacity to bind some biologically important metals (Zn, Cu, Co, Fe) and their role was dramatically increased as behavior models for enzymes and other metalloproteins. The modification of macrocyclic polyamine receptor molecules with additional ligands (arms) enables to interact with nucleobase, sugar, and other biomolecules moieties for a more efficient multipoint recognition, as well as for thermodynamic stabilization of the ternary complexes in aqueous solution. Cyclen, cyclam, their derivatives, and metal complexes are proposed as good candidates to cross the blood-brain barrier and with low toxicity as potential neuroprotective or neurorescue agents in the treatment of Alzheimer’s disease. In addition, cyclen derivatives showed antibacterial, anti-HIV, and anti-malarial activities. On the other hand, polyphenolic compounds, like coumarins and its derivatives are able to bind transition metal ions and inhibit hydroxyl radical and hydrogen peroxide formation produced by Fenton’s reactions. Polyphenol derivatives (or metabolites) were found to have numerous therapeutic applications, such as central nervous system stimulants, antitumor and anti-HIV therapy, antibacterial, anticoagulants, etc. We prepared cyclen carboxymethyl en and L-3, 4-dihydroxyphenylalanine (L-DOPA) derivatives with His-rich dipeptides (cyclen-His-His, cyclen-Asp-His, cyclen-Glu-His, Dopa-His-His, Dopa-Asp-His, Dopa-Glu-His, Dopa-His-His-Dopa, Dopa-Asp-His-Dopa, Dopa-Glu-His-Dopa, Dopa-Glu-His-Dopa, and Dopa-cyclen) via solid-phase synthesis strategy and identified using 1H-NMR and MALDI-TOF MS. The new DOPA and cyclen (1, 4, 7-10-(carboxymethyl)- tetraazacyclo-dodecane) oligopeptide derivatives were tested for their biological activity evaluation, such as antioxidant, antimicrobial, anticancer, antidiabetic, etc. activities using their different concentration levels. The cytotoxicity and genotoxicity of new compounds were also studied. Figure 1: Stepwise reaction of the functional derivation of tri-N-Boc-Cyclen-CH2 COOH with dipeptide (HH, DH, EH)
Biography Lili Arabuli has completed her Ph.D. from Jvane Javakhishvili Tbilisi State University and Postdoctoral studies from P J Safarik University (Slovak Republic), University of Michigan (US), and the University of Tuscia (Italy). She is an Associate Professor and the Head of the direction of Chemistry at the University of Georgia. She has published more than 15 papers in reputed journals, book chapters, and one monograph. Her research interests are mainly focused on medicinal chemistry, bioinorganic chemistry, organic and inorganic synthesis.