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Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Related Experiment Video

Updated: Sep 20, 2025

Deacetylation Assays to Unravel the Interplay between Sirtuins SIRT2 and Specific Protein-substrates
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Structural basis for sirtuin 2 activity and modulation: Current state and opportunities.

Samuel P Bernhard1, Francesc X Ruiz2, Stacy Remiszewski3

  • 1Division of Chemistry, Conifer Point Pharmaceuticals, Doylestown, Pennsylvania, USA.

The Journal of Biological Chemistry
|May 24, 2025
PubMed
Summary
This summary is machine-generated.

Sirtuin 2 (SIRT2) enzyme structure is well-studied, but its modulation for therapeutic benefits requires further research into activation, inhibition, and targeting specific diseases like cancer.

Keywords:
Sirtuin 2allosteric modulationcancercrystal structuresdrug discoveryinfectious disease

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Area of Science:

  • Biochemistry and Structural Biology
  • Enzymology
  • Medicinal Chemistry

Background:

  • Sirtuin 2 (SIRT2) is a NAD+-dependent deacetylase with a broad regulatory role in cellular processes.
  • Numerous crystal structures of SIRT2 provide insights into its catalytic mechanism and substrate interactions.
  • Despite structural knowledge, understanding SIRT2's full functional spectrum and developing selective modulators remains challenging.

Purpose of the Study:

  • To review the structural biology of SIRT2, focusing on its catalytic core, substrate binding, and modulator interactions.
  • To explore structural insights into the molecular modulation of SIRT2, including inhibition and selectivity.
  • To discuss the impact of structural variations and identify knowledge gaps for developing optimized SIRT2 modulators.

Main Methods:

  • Analysis of existing SIRT2 crystal structures (over 39 reported).
  • Review of literature on mechanism-based, substrate-mimicking, and pocket-binding inhibitors.
  • Examination of structural variations including mutations, posttranslational modifications, and quaternary states.

Main Results:

  • SIRT2's catalytic core features adaptable binding pockets for acyl chains and cofactors.
  • Specific selectivity pockets allow for targeted inhibition by various chemotypes.
  • Structural data informs the design of mechanism- and substrate-based inhibitors.

Conclusions:

  • Further structural and functional studies are needed to fully understand SIRT2 modulation for therapeutic applications.
  • Investigating disordered termini, quaternary states, and posttranslational modifications is crucial for developing tailored SIRT2 modulators.
  • Addressing knowledge gaps will unlock the therapeutic potential of SIRT2 in diseases like viral infections and cancers.