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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.
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Protein Modifications in the RER

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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.

Phase II Reactions: Acetylation Reactions

Phase II Reactions: Acetylation Reactions

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Regulated Protein Degradation

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...

Regulated Protein Degradation

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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[Deimination or citrullination, a post-translational modification with many physiological and pathophysiological

Marie-Claire Méchin¹, Rachida Nachat, Fanny Coudane

¹UMR 5165 CNRS/ Université Paul Sabatier, Hôpital Purpan, place du Docteur Baylac, TSA 40031, 31059 Toulouse Cedex 9, France. marie-claire.mechin@ udear.cnrs.fr

Medecine Sciences : M/S

|February 9, 2011

Summary

Deimination (or citrullination) is a protein modification crucial for cell processes and diseases like multiple sclerosis. This calcium-dependent enzyme action changes protein charge, impacting function and potentially involving auto-deimination.

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Published on: April 9, 2017

Area of Science:

Biochemistry
Molecular Biology
Cellular Biology

Background:

Deimination, also known as citrullination, is a post-translational modification.
This process involves the calcium-dependent enzymatic conversion of peptidyl-arginine to peptidyl-citrulline.
It plays roles in fundamental cellular processes and is implicated in diseases like multiple sclerosis and rheumatoid arthritis.

Purpose of the Study:

To explore the multifaceted nature of deimination.
To understand its role in both normal cellular functions and pathological conditions.
To highlight the consequences of deimination on protein structure and function.

Main Methods:

The study focuses on the biochemical mechanism of deimination.
It examines the consequences of altered protein charge due to this modification.
Enzyme characterization of peptidylarginine deiminases (PADs) is central.

Main Results:

Deimination significantly alters protein charge, affecting conformation, stability, and interactions.
Five human PAD isotypes (PAD1-4 and PAD6) exhibit distinct tissue expression patterns.
These enzymes are tightly regulated at transcriptional and post-transcriptional levels.

Conclusions:

Deimination is a critical post-translational modification with broad biological significance.
Understanding deimination and PAD enzymes is vital for comprehending cellular regulation and disease pathogenesis.
Further research into PAD regulation, including potential auto-deimination, is warranted.