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Covalently Linked Protein Regulators

Covalently Linked Protein Regulators

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.
These groups modify specific amino acids in a protein.

Phosphorylation

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...

Caspases

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.

Protein Modifications in the RER

Protein Modifications in the RER

Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.

Membrane Asymmetry Regulating Transporters

Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...

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Related Experiment Video

Updated: May 26, 2026

Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches

Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches

Published on: October 13, 2022

Cardioprotection requires flipping the 'posttranslational modification' switch.

Karen Porter¹, Heidi M Medford, Cheryl M McIntosh

¹Program in Nutrition and Exercise Physiology, Washington State University, Spokane, WA, USA.

|December 14, 2011

Summary

This summary is machine-generated.

Protecting the heart during reperfusion involves understanding posttranslational modifications (PTM). Targeting PTMs offers a promising strategy for minimizing cardiac damage after ischemia and reperfusion.

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In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model

In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model

Published on: October 27, 2020

Area of Science:

Cardiovascular Science
Molecular Biology
Biochemistry

Background:

Ischemia and reperfusion injury significantly impair cardiac function.
Exercise and preconditioning offer cardioprotection but mechanisms require further elucidation.
Posttranslational modifications (PTMs) are critical regulators of cellular signaling pathways.

Purpose of the Study:

To review the role of PTMs in cardioprotection.
To highlight PTMs as potential therapeutic targets for ischemia-reperfusion injury.

Main Methods:

Literature review focusing on PTMs in cardiac ischemia-reperfusion.
Analysis of signaling pathways regulated by PTMs (phosphorylation, O-GlcNAcylation, methylation, acetylation).

Main Results:

PTMs critically regulate key cardioprotective signaling pathways.
Specific PTMs influence apoptosis, necrosis, and cardiac function post-ischemia.
Targeting PTMs can enhance cardioprotection.

Conclusions:

PTMs are essential, yet often overlooked, regulators of cardioprotection.
Therapeutic strategies targeting PTMs hold significant potential for treating cardiac ischemia-reperfusion injury.