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Related Concept Videos

DNA Topoisomerases02:02

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 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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Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Simulating DNA at low resolution

W K Olson1

  • 1Department of Chemistry, Rutgers, State University of New Jersey, Piscataway 08855-0939, USA. olson@rutchem.rutgers.edu

Current Opinion in Structural Biology
|April 1, 1996
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This summary is machine-generated.

New computational methods analyze DNA structure and protein interactions. These advances connect genomic sequences to 3D structures, revealing how proteins influence DNA

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Area of Science:

  • Computational Biology
  • Structural Biology
  • Biophysics

Background:

  • Analyzing double-helical DNA structure and sequence-dependent features is crucial.
  • Understanding protein-DNA interactions and their effects on DNA conformation is a key challenge.

Purpose of the Study:

  • To present new mathematical and computational approaches for DNA structure analysis.
  • To investigate local and global structural changes in DNA induced by protein binding.
  • To develop methods for simulating long DNA chains and their configurations.

Main Methods:

  • Development of novel mathematical models for DNA structure analysis.
  • Computer simulations incorporating sequence-dependent DNA features and polyelectrolyte character.
  • Advanced methods for tracking multiple configurations in long polymer simulations.

Main Results:

  • New methods enable detailed analysis of DNA structural dynamics, including bending, untwisting, and sliding.
  • Simulations reveal how protein binding induces significant local and global DNA structural changes.
  • Computational approaches effectively model polyelectrolyte behavior and environmental forces in DNA simulations.

Conclusions:

  • Recent advances connect genomic sequences to three-dimensional DNA structures.
  • These methods provide insights into DNA folding and protein-induced deformations.
  • Future research will further link DNA sequence to structure and function.