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The DNA Helix01:16

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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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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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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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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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The Structure and Function of DNA G-Quadruplexes.

Jochen Spiegel1, Santosh Adhikari2, Shankar Balasubramanian1,2,3

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|September 14, 2020
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Summary
This summary is machine-generated.

Guanine-quadruplexes (G4s) are DNA structures involved in crucial genome functions and cancer. Research is advancing our understanding of G4s and their therapeutic potential.

Keywords:
DNAG-quadruplexG4drug discoverynucleic acidssecondary structure

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biochemistry

Background:

  • Guanine-rich DNA sequences form G-quadruplexes (G4s), noncanonical four-stranded structures.
  • Initially viewed as structural anomalies, G4s are now recognized for their roles in vital genome processes.
  • G4s are increasingly linked to cancer biology, driving research into their mechanisms and therapeutic applications.

Purpose of the Study:

  • To provide a comprehensive perspective on G-quadruplex structure and function.
  • To highlight key molecules and methodological advancements for studying G4s in human cells.
  • To examine recent insights into G4 biology, protein interactions, and drug discovery opportunities.

Main Methods:

  • Literature review and synthesis of current research on G-quadruplexes.
  • Analysis of molecular mechanisms underlying G4 formation and function.
  • Examination of protein-G4 interactions and their biological significance.

Main Results:

  • G-quadruplexes play significant roles in transcription, replication, genome stability, and epigenetic regulation.
  • Numerous connections exist between G4 structures and various aspects of cancer biology.
  • Advances in methodologies facilitate the study of G4 structures within human cellular contexts.

Conclusions:

  • G-quadruplexes are critical regulatory elements in the genome with implications for human health and disease.
  • Understanding G4 mechanisms opens avenues for novel therapeutic strategies, particularly in oncology.
  • Continued research into G4s and their interactors promises to yield new drug discovery opportunities.