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Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

Allosteric Proteins-ATCase

Allosteric Proteins-ATCase

Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...

Allosteric Regulation

Allosteric Regulation

Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...

Ligand Binding and Linkage

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...

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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation

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Allosteric conformational spread: exact results using a simple transfer matrix method.

S G J Mochrie¹, A H Mack, L Regan

¹Department of Physics, Yale University, New Haven, Connecticut 06511, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|January 15, 2011

Summary

This summary is machine-generated.

A new transfer matrix method provides exact analytical solutions for the conformational spread model of allosteric cooperativity in one-dimensional systems. This method accurately models ligand binding and conformational states, validated by bacterial flagellar motor data.

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Area of Science:

Biophysics
Biochemistry
Computational Biology

Background:

Allosteric cooperativity is crucial for biological regulation.
Existing models like Monod-Wyman-Changeaux and Koshland-Nemethy-Filmer offer valuable insights but have limitations.
The conformational spread (CS) model provides an alternative framework for understanding cooperativity.

Purpose of the Study:

To develop an exact analytical method for the conformational spread model.
To derive expressions for key thermodynamic and binding properties.
To validate the model using experimental data from the bacterial flagellar motor.

Main Methods:

A transfer matrix method is employed for a one-dimensional arrangement of four-state binding sites.
Each binding site can exist in two conformational states, each capable of binding a ligand.
Analytical expressions are derived for the grand partition function and mean ligand fraction.

Main Results:

Exact analytical expressions were derived for the grand partition function, mean ligand fraction, and mean conformational state fraction.
The method successfully fits experimental data for ligand binding and bias in the bacterial flagellar motor.
Relationships between the CS model and classical allosteric theories were elucidated.

Conclusions:

The transfer matrix method offers a powerful and exact analytical approach to the CS model.
The derived expressions accurately describe allosteric cooperativity and ligand binding.
This work provides a robust framework for analyzing complex biological systems exhibiting allosteric behavior.