Reference : DNA partitions into triplets under tension in the presence of organic cations, with s... |
Scientific journals : Article | |||
Life sciences : Biochemistry, biophysics & molecular biology Life sciences : Genetics & genetic processes Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others | |||
Physics and Materials Science | |||
http://hdl.handle.net/10993/33076 | |||
DNA partitions into triplets under tension in the presence of organic cations, with sequence evolutionary age predicting the stability of the triplet phase | |
English | |
Taghavi, Amirhossein ![]() | |
van der Schoot, Paul [Technical University of Eindhoven] | |
Berryman, Josh ![]() | |
Nov-2017 | |
Quarterly Reviews of Biophysics | |
Cambridge University Press | |
50 | |
Yes | |
International | |
0033-5835 | |
1469-8994 | |
[en] DNA ; GNC ; arginine ; DNA stretching ; Sigma DNA ; S-DNA | |
[en] Using atomistic simulations, we show the formation of stable triplet structure when particular GC-rich DNA duplexes are extended in solution over a timescale of hundreds of nanoseconds, in the presence of organic salt. We present planar-stacked triplet disproportionated DNA (Σ DNA) as a possible solution phase of the double helix under tension, subject to sequence and the presence of stabilising co-factors. Considering the partitioning of the duplexes into triplets of base pairs as the first step of operation of recombinase enzymes like RecA, we emphasise the structure–function relationship in Σ DNA. We supplement atomistic calculations with thermodynamic arguments to show that codons for ‘phase 1’ amino acids (those appearing early in evolution) are more likely than a lower entropy GC-rich sequence to form triplets under tension. We further observe that the four amino acids supposed (in the ‘GADV world’ hypothesis) to constitute the minimal set to produce functional globular proteins have the strongest triplet-forming propensity within the phase 1 set, showing a series of decreasing triplet propensity with evolutionary newness. The weak form of our observation provides a physical mechanism to minimise read frame and recombination alignment errors in the early evolution of the genetic code. | |
University of Luxembourg: High Performance Computing - ULHPC | |
R-AGR-0136 > NANOMECH > 15/03/2014 - 14/03/2017 > BERRYMAN Josh | |
Researchers ; Professionals ; Students ; General public | |
http://hdl.handle.net/10993/33076 | |
10.1017/S0033583517000130 | |
http://www.cambridge.org/core/journals/quarterly-reviews-of-biophysics/article/dna-partitions-into-triplets-under-tension-in-the-presence-of-organic-cations-with-sequence-evolutionary-age-predicting-the-stability-of-the-triplet-phase/181399C9E333C317EE1C18764471FCE9 | |
Supplementary data on journal site. |
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