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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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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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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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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.
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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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A thermo-driven DNA zipper.

Chunyan Wang1, Yu Tao, Youhui Lin

  • 1State Key laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China. jren@ciac.ac.cn xqu@ciac.ac.cn.

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Summary
This summary is machine-generated.

This study demonstrates a temperature-controlled DNA nano-zipper. The double crossover DNA structure can be reversibly opened and closed using temperature.

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Area of Science:

  • Nanotechnology
  • Molecular Biology
  • Biophysics

Background:

  • DNA nanotechnology utilizes DNA's self-assembly properties for creating nanoscale structures.
  • Double crossover (DX) DNA structures offer a versatile platform for complex molecular designs.

Purpose of the Study:

  • To design and demonstrate a functional DNA nano-zipper.
  • To achieve reversible control over the nano-zipper's states using an external stimulus.

Main Methods:

  • Construction of a DNA nano-zipper using double crossover (DX) DNA motifs.
  • Utilizing temperature as a switch to control the conformational changes of the DNA nano-zipper.

Main Results:

  • Successful fabrication of a DNA nano-zipper based on DX DNA structures.
  • Demonstration of reversible opening and closing of the nano-zipper in response to temperature changes.

Conclusions:

  • The developed DNA nano-zipper is a functional nanoscale device.
  • Temperature is an effective stimulus for reversible control of DNA nanostructures.