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ATP and Macromolecule Synthesis

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
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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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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Poly(ADP-ribose): A Dynamic Trigger for Biomolecular Condensate Formation.

Anthony K L Leung1

  • 1Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA; Department of Molecular Biology and Genetics, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA; Department of Oncology, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA.

Trends in Cell Biology
|April 18, 2020
PubMed
Summary

Poly(ADP-ribose) (PAR) regulates biomolecular condensates, crucial in diseases like cancer. Understanding PARylation

Keywords:
ADP-ribosylationbiomolecular condensateliquid–liquid phase separationpoly(ADP-ribose)poly(ADP-ribose) polymerasepoly(ADP-ribose) polymerase inhibitor

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cell Biology

Background:

  • Poly(ADP-ribose) (PAR) is a nucleic acid-like protein modification.
  • PAR-mediated biomolecular condensates are implicated in cancer, viral infection, and neurodegeneration.
  • Modulating PARylation via PAR polymerase (PARP) inhibitors shows therapeutic potential for these diseases.

Purpose of the Study:

  • To review the role of PARylation in regulating biomolecular condensates.
  • To discuss current knowledge gaps regarding intracellular PARylation.
  • To explore potential solutions and therapeutic applications for PARylation-related diseases.

Main Methods:

  • Literature review of existing research on PARylation and biomolecular condensates.
  • Analysis of the fundamental parameters of intracellular PARylation.
  • Discussion of therapeutic strategies involving PARP inhibitors.

Main Results:

  • PARylation is a key regulator of biomolecular condensate formation and dynamics.
  • PARP inhibitors can modulate condensate behavior and component trafficking.
  • Significant knowledge gaps exist in understanding PARylation site, chain length, structure, and physicochemical properties.

Conclusions:

  • Further research into the fundamental aspects of PARylation is crucial for understanding its role in disease.
  • Targeting PARylation offers promising therapeutic avenues for cancer, viral infections, and neurodegenerative disorders.
  • A deeper understanding of PARylation mechanisms will enhance the development of effective PARP-based therapies.