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Ligand Binding Sites

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

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...

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...

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Related Experiment Video

Updated: Jun 13, 2026

Measuring Nucleotide Binding to Intact, Functional Membrane Proteins in Real Time

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Published on: March 11, 2021

Beyond Binding Affinity: How a Conformation-Specific Salt Bridge Tunes KIF1A Mechanochemistry.

Abhipsa Shatarupa¹, Lu Rao¹, Arne Gennerich¹

¹Department of Biochemistry and Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, New York, USA.

Cytoskeleton (Hoboken, N.J.)

|June 12, 2026

Summary

Mutations in KIF1A cause hereditary spastic paraplegia type 30 (SPG30). A specific salt bridge disruption alters KIF1A motor function, revealing a new mechanism contributing to KAND.

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Last Updated: Jun 13, 2026

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Area of Science:

Molecular Biology
Neuroscience
Biochemistry

Background:

Mutations in KIF1A are associated with KIF1A-associated neurological disorders (KAND), including hereditary spastic paraplegia type 30 (SPG30).
The KIF1A motor protein plays a critical role in intracellular transport.

Purpose of the Study:

To investigate the structural and functional consequences of KIF1A mutations at residue R350.
To elucidate the role of a specific salt bridge in KIF1A motor regulation and its link to KAND.

Main Methods:

High-resolution cryo-electron microscopy (cryo-EM) to determine structures of KIF1A mutants.
Single-molecule motility assays to assess motor function.

Main Results:

KIF1A R350 mutations abolish a conformation-dependent salt bridge with α-tubulin E415.
Disruption of this salt bridge increases KIF1A motor velocity but reduces processivity and microtubule affinity.
These changes were observed in the apo state of the motor.

Conclusions:

A novel mechanism involving a conformation-dependent electrostatic interaction regulates KIF1A motility.
Alterations in KIF1A motor mechanochemistry due to R350 mutations contribute to the pathology of KAND.