G-quadruplex; mass spectrometry; DNA; structural biology; ion mobility; spectroscopy
Abstract :
[en] G-rich DNA sequences are able to fold into structures called G-quadruplexes. To obtain general trends in the influence of loop length on the structure and stability of G-quadruplex structures, we studied oligodeoxynucleotides with random bases in the loops. Sequences studied are dGGGWiGGGWjGGGWkGGG, with W = thymine or adenine with equal probability, and i, j, and k comprised between 1 and 4. All were studied by circular dichroism, native gel electrophoresis, UV-monitored thermal denaturation, and electrospray mass spectrometry, in the presence of 150 mM potassium, sodium, or ammonium cations. Parallel conformations are favored by sequences with short loops, but we also found that sequences with short loops form very stable multimeric quadruplexes, even at low strand concentration. Mass spectrometry reveals the formation of dimers and trimers. When the loop length increases, preferred quadruplex conformations tend to be more intramolecular and antiparallel. The nature of the cation also has an influence on the adopted structures, with K+ inducing more parallel multimers than NH4+ and Na+. Structural possibilities are discussed for the new quadruplex higher-order assemblies.
Research Center/Unit :
Giga-Systems Biology and Chemical Biology - ULiège
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