Dna Knotting : Occurrences , Consequences
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چکیده
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منابع مشابه
DNA supercoiling inhibits DNA knotting
Despite the fact that in living cells DNA molecules are long and highly crowded, they are rarely knotted. DNA knotting interferes with the normal functioning of the DNA and, therefore, molecular mechanisms evolved that maintain the knotting and catenation level below that which would be achieved if the DNA segments could pass randomly through each other. Biochemical experiments with torsionally...
متن کاملKnotting and Linking in Macromolecules
In the 1980’s, knotting in DNA became a fundamental research dimension in the study of the mechanisms by which enzymes act on it. Later, the first compelling identification of knotting in proteins, in 2000, launched the study of knotting in protein structures and linear macromolecules more generally following on theoretical efforts of the 1960’s. While the linking occurring in structures such a...
متن کاملEffect of Nanoslit Confinement on the Knotting Probability of Circular DNA
Monte Carlo simulations are used to study the knotting probability of circular DNA confined in a slit. We systematically vary the slit height, the width, and the contour length of the DNA molecule. We find that the trend in knotting probability with respect to slit height can be monotonic or nonmonotonic, depending on the width and contour length. The nonmonotonic trend is caused by two competi...
متن کاملSupercoiled DNA-directed knotting by T4 topoisomerase.
The mechanism by which the type 2 topoisomerase from bacteriophage T4 mediates knotting of negatively supercoiled DNA was deduced from an analysis of product topology. The knotted products were nicked and then subjected to electrophoresis in order to separate species on the basis of the minimum number of crossings in the knotted form. Knots with defined numbers of crossings were purified and th...
متن کاملOs2–Os4 Switch Controls DNA Knotting and Anticancer Activity
Dinuclear trihydroxido-bridged osmium-arene complexes are inert and biologically inactive, but we show here that linking dihydroxido-bridged Os(II) -arene fragments by a bridging di-imine to form a metallacycle framework results in strong antiproliferative activity towards cancer cells and distinctive knotting of DNA. The shortened spacer length reduces biological activity and stability in solu...
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تاریخ انتشار 2007