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DNA Topoisomerases

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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 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 replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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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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Stimuli-Responsive DNA-Switchable Biointerfaces.

Fangfei Yin1,2, Xiuhai Mao3, Min Li3

  • 1Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility (SSRF) , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China.

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Summary
This summary is machine-generated.

DNA-based switchable biointerfaces offer precise control over properties, enabling diverse applications. These smart interfaces are highly customizable and responsive to external stimuli for advanced functionalities.

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Area of Science:

  • Biotechnology
  • Materials Science
  • Nanotechnology

Background:

  • Switchable interfaces, or smart interfaces, dynamically alter macroscopic properties upon external stimuli.
  • DNA-based biointerfaces provide superior diversity, uniformity, reproducibility, and functionality compared to artificial counterparts.
  • DNA sequence dictates precise structural and active properties, enabling atomic-level design of biointerfaces.

Purpose of the Study:

  • To review the design principles of switchable DNA biointerfaces.
  • To explore their stimulus responses, including single-switch, dual-response, and sequential operations.
  • To highlight diverse applications and future prospects in this emerging field.

Main Methods:

  • Discussion of DNA structures like double strands, G-quadruplexes, i-Motifs, triplexes, and parallel-stranded duplexes.
  • Analysis of design strategies for switchable DNA biointerfaces.
  • Categorization of applications based on operational modes (single-switch, dual-response, sequential).

Main Results:

  • Switchable DNA biointerfaces exhibit tunable properties based on sequence and structure.
  • Diverse DNA structures enable sophisticated interface designs.
  • Applications span sensing, imaging, drug delivery, logic gates, and nanomachines.

Conclusions:

  • Switchable DNA biointerfaces represent a powerful platform for advanced applications.
  • Precise control over DNA structure and sequence unlocks novel functionalities.
  • Further research is needed to address challenges and explore future directions in this field.