Polyamines stimulate RecA-mediated recombination by condensing duplex DNA and stabilizing intermediates

文献信息

发布日期 2020-05-14
DOI 10.1039/D0CP01061H
影响因子 3.676
作者

Naciye Esma Tirtom, Yang Hsu, Hung-Wen Li


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摘要

Polyamines are naturally occurring cationic molecules in cells. In addition to their roles in modulating gene expression and cell proliferation, they have been shown to stimulate DNA recombination. The molecular mechanism for stimulation is not clear. We utilized single-molecule tethered particle motion (TPM) experiments to investigate how polyamines stimulate RecA-mediated recombination. We showed that natural polyamines, spermine and spermidine, condense duplex DNA, but with different efficiencies. While ∼300 μM of spermine condenses 50% of duplex DNA, 2.0 mM of spermidine is required to achieve the same level of condensation. The condensation takes place in a stepwise manner, and is reversible upon removal of polyamines. We also showed that addition of polyamines stimulates the duplex capture activity of RecA filament and stabilizes the intermediates with longer dwell time. Through condensing duplex DNA and stabilizing the complex of RecA filaments and duplex DNA, polyamines stimulate the formation of functional intermediates by ∼20-fold, and promote recombination progression.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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