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Related Concept Videos

Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Lagging Strand Synthesis01:59

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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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DNA Topoisomerases02:02

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
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DNA-only Transposons02:57

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Harnessing Exciton Flux With a Single-Stranded DNA-Programmed Nanodevice.

Mulin Duan1, Yan Zhou1, Haoran Zheng1

  • 1State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, New Cornerstone Science Laboratory, Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai, China.

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This summary is machine-generated.

Researchers developed a DNA-nanodevice for efficient energy transfer. This breakthrough uses asymmetric π-π interactions and DNA spatial confinement for precise control in nanodevices.

Keywords:
DNA nanodeviceasymmetric π–π interactionsenergy flow regulationfunctional molecule assemblyspatial confinement

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Materials Science

Background:

  • Nanosystems require functional module assembly.
  • Thermodynamic incompatibility hinders precise nanodevice integration.

Purpose of the Study:

  • To construct a single-stranded DNA (ssDNA)-directed nanodevice for efficient energy transduction.
  • To overcome challenges in atomically precise nanodevice integration.

Main Methods:

  • Utilized ssDNA-directed self-assembly for nanodevice construction.
  • Harnessed asymmetric π-π interactions within DNA spatial confinement to split exciton energy levels.
  • Engineered a nanodevice with a light-harvesting engine, vibrational metal nanocluster actuator, and programmable ssDNA.

Main Results:

  • Achieved 94.3% quenching efficiency through controlled exciton energy level splitting.
  • Demonstrated DNA spatial confinement orchestrating hydrophobic, covalent, and π-π interactions for precise arrangement.
  • Showcased continuous control over energy transfer efficiency by tuning DNA length and nanocluster ligands.

Conclusions:

  • Established vibrational control as a general paradigm for nanoscale energy transduction.
  • Developed a programmable platform manipulating non-radiative decay via π-π interactions.
  • Enabled precise component arrangement and enthalpy-driven switching between radiative and non-radiative pathways.