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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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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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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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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 replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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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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Simulating the Helicase Enzymatic Action on ds-DNA: A First-Principles Molecular Dynamics Study.

Angel Ivan Rodriguez-Leon1, Cristian Ordóñez2, Ruben Santamaria1

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This study reveals the mechanical forces and energy changes during double-stranded DNA unwinding, crucial for understanding DNA replication and cellular functions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • DNA replication is a fundamental biological process.
  • Understanding DNA mechanics is key to advancements in genetics and molecular biology.

Purpose of the Study:

  • To investigate the mechanical characteristics of double-stranded DNA (ds-DNA) during unwinding.
  • To simulate helicase action and analyze forces, thermal fluctuations, and energy changes during base pair separation.

Main Methods:

  • Simulated helicase action using Langevin and sequential/helical steering harmonic forces.
  • Investigated three distinct ds-DNA molecules.
  • Combined quantum mechanical techniques with an implicit force model.

Main Results:

  • Detailed analysis of thermal fluctuations, energy changes, charge variations, and forces during ds-DNA unwinding.
  • Quantified mechanical properties associated with each base pair separation.

Conclusions:

  • The integrative approach combining quantum mechanics and implicit force models offers versatile insights into DNA mechanisms.
  • Enhanced understanding of DNA replication and cellular functioning through detailed mechanical analysis.