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Related Concept Videos

Covalently Linked Protein Regulators02:04

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 Regulators02:04

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.
Phosphorylation01:02

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...
Phosphorylation01:02

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 Phosphatases02:54

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...
Protein Kinases and Phosphatases02:54

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...

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Related Experiment Video

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Oligopeptide Competition Assay for Phosphorylation Site Determination
09:16

Oligopeptide Competition Assay for Phosphorylation Site Determination

Published on: May 18, 2017

Two variable active site residues modulate response regulator phosphoryl group stability.

Stephanie A Thomas1, Jocelyn A Brewster, Robert B Bourret

  • 1Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC 27599-7290, USA.

Molecular Microbiology
|June 19, 2008
PubMed
Summary

Signal transduction networks use protein phosphorylation to control biological responses. Researchers found that altering two active site positions in response regulators can significantly change dephosphorylation rates, impacting signal speed.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Systems Biology

Background:

  • Signal transduction networks regulate biological processes by switching components on/off.
  • Two-component systems, common in bacteria and eukaryotes, utilize phosphorylation/dephosphorylation for signal transduction.
  • Response regulator receiver domains exhibit diverse self-dephosphorylation rates despite conserved active sites.

Purpose of the Study:

  • To investigate how specific amino acid substitutions in response regulator active sites affect autodephosphorylation kinetics.
  • To determine if amino acid composition at variable active site positions influences dephosphorylation rates across different response regulators.
  • To explore the potential for manipulating phosphoryl group stability and predicting signal transduction kinetics.

Main Methods:

  • Site-directed mutagenesis of key variable positions in the active sites of response regulator proteins (e.g., CheY and Spo0F).
  • Measurement of autodephosphorylation rates for wild-type and mutant proteins.
  • Comparative analysis of kinetic data across different response regulators.

Main Results:

  • Substitutions at two variable active site positions modulated autodephosphorylation rates, decreasing CheY rates up to 40-fold and increasing Spo0F rates up to 110-fold.
  • Certain amino acids had qualitatively similar effects on dephosphorylation rates in different response regulators.
  • Mutant proteins with matched amino acid substitutions did not always display similar kinetics, indicating the influence of other factors.

Conclusions:

  • Specific amino acid compositions at variable active site positions significantly impact response regulator autodephosphorylation rates.
  • While some effects are conserved, absolute rates are influenced by unknown factors beyond these two positions.
  • Understanding these relationships could enable manipulation of phosphoryl group stability and prediction of signal transduction dynamics from protein sequences.