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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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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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A Cationic Smart Copolymer for DNA Binding.

Tânia Ribeiro1, Ana Margarida Santiago2, Jose Manuel Gaspar Martinho3

  • 1CQFM-Centro de Química-Física Molecular and IN-Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal. tania.ribeiro@tecnico.ulisboa.pt.

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|April 11, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel temperature-responsive, cationic block copolymer using RAFT polymerization. This new polymer enables tunable DNA binding and coacervate complex formation for potential gene delivery applications.

Keywords:
DNAFCSblock copolymerfluorescencestimuli responsive polymer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Developing advanced polymers for biomedical applications is crucial.
  • Block copolymers offer tunable properties for specific functions.
  • Controlled polymerization techniques are essential for precise material synthesis.

Purpose of the Study:

  • To synthesize a novel block copolymer with temperature-responsive and DNA-binding capabilities.
  • To control the polymer's properties, such as its volume phase transition temperature (VPTT).
  • To investigate the formation and characteristics of coacervate complexes with DNA.

Main Methods:

  • Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization was employed for synthesis.
  • The block copolymer composition (di(ethylene glycol) methyl ether methacrylate and oligo(ethylene glycol) methyl ether methacrylate ratio) was varied.
  • Fluorescence correlation spectroscopy and fluorescence spectroscopy were used for characterization.

Main Results:

  • A block copolymer with a temperature-responsive block (tunable VPTT from 25 to >90 °C) and a cationic DNA-binding block (trimethyl-2-methacroyloxyethylammonium chloride) was successfully synthesized.
  • Good control over polymer size and composition was achieved.
  • Coacervate complexes formed between the block copolymer and single-strand DNA were characterized.

Conclusions:

  • The synthesized block copolymer demonstrates tunable thermal properties and effective DNA binding.
  • The material shows promise for biomedical applications, particularly in controlled gene delivery systems.