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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...

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

No description available

Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

No description available

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...

Reaction Mechanisms

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:

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Updated: Jan 26, 2026

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Published on: October 4, 2024

A portable allosteric mechanism.

Urszula Gryczynski¹, Robert Schleif

¹Biology Department, Johns Hopkins University, Baltimore, Maryland 21218, USA.

|August 25, 2004

Summary

This summary is machine-generated.

The AraC protein

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Last Updated: Jan 26, 2026

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

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Area of Science:

Molecular Biology
Biochemistry
Genetics

Background:

The AraC protein regulates gene expression through an allosteric mechanism controlling its DNA-binding activity.
Beta-galactosidase is a key enzyme in lactose metabolism, often used as a reporter in molecular biology.

Purpose of the Study:

To investigate the portability of the AraC protein's allosteric regulatory mechanism.
To engineer an arabinose-regulated beta-galactosidase system.

Main Methods:

Grafting a portion of the alpha-peptide sequence of beta-galactosidase into a nonessential region of the AraC protein.
Utilizing the arabinose-induced conformational change in AraC to modulate beta-galactosidase activity.

Main Results:

Successfully generated an arabinose-regulated beta-galactosidase.
Demonstrated that arabinose controls the availability of the alpha-peptide to the alpha-acceptor beta-galactosidase.

Conclusions:

The allosteric regulatory mechanism of AraC is portable and can be transferred to other proteins.
This engineered system allows for arabinose-dependent modulation of beta-galactosidase activity, creating a novel biosensor.