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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.

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.
These groups modify specific amino acids in a protein.

Assembly of Signaling Complexes

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
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Mechanical Protein Functions

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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

Amplifying Signals via Enzymatic Cascade

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Diversity in Cell Signaling Responses

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Related Experiment Video

Updated: Jun 17, 2026

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins

NMR ¹⁵N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins

Published on: November 1, 2024

Large conformational changes in proteins: signaling and other functions.

Barry J Grant¹, Alemayehu A Gorfe, J Andrew McCammon

¹Department of Chemistry and Biochemistry and Center for Theoretical Biological Physics, University of California San Diego, La Jolla, CA, USA.

Current Opinion in Structural Biology

|January 12, 2010

Summary

Guanine and adenine nucleotide triphosphatases, like Ras proteins and kinases, change shape when binding ligands. A conformational selection model explains this protein switching by changes in pre-existing shapes.

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Area of Science:

Biochemistry
Molecular Biology
Computational Biology

Background:

Guanine and adenine nucleotide triphosphatases are crucial enzymes involved in cellular signaling.
Proteins like Ras and protein kinases exhibit significant conformational changes during their functional cycle.
Understanding these dynamic changes is key to deciphering protein function and dysfunction.

Purpose of the Study:

To elucidate the mechanisms behind large conformational changes in nucleotide triphosphatases upon ligand binding.
To integrate computational simulations with experimental data for a comprehensive understanding.
To explore the emerging 'conformational selection' model for protein activity.

Main Methods:

Utilized advanced computer simulation techniques.
Integrated findings with experimental studies.
Analyzed protein conformational dynamics and ligand interactions.

Main Results:

Observed significant conformational alterations in guanine and adenine nucleotide triphosphatases.
The 'conformational selection' model provides a robust explanation for observed protein switching.
Demonstrated the utility of combined computational and experimental approaches.

Conclusions:

Protein conformational changes are fundamental to the function of enzymes like Ras and kinases.
The conformational selection mechanism, involving shifts in pre-existing states, best describes protein dynamics.
Future research can leverage these insights for drug discovery and understanding disease mechanisms.