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Related Concept Videos

Ligand Binding Sites02:40

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...
Ligand Binding Sites02:40

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...
Ligand Binding and Linkage00:49

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...
Ligand Binding and Linkage00:49

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...
The Equilibrium Binding Constant and Binding Strength02:18

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 Two-State Receptor Model01:29

The Two-State Receptor Model

The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with one...

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Modeling Ligands into Maps Derived from Electron Cryomicroscopy
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Structural characterization of GABARAP-ligand interactions.

Yvonne Thielmann1, Oliver H Weiergräber, Jeannine Mohrlüder

  • 1Institut für Strukturbiologie und Biophysik 3 (Strukturbiochemie), Forschungszentrum Jülich, Jülich, Germany.

Molecular Biosystems
|May 23, 2009
PubMed
Summary

The GABA(A) receptor-associated protein (GABARAP) has two key hydrophobic binding sites crucial for its function in protein trafficking and membrane anchoring. These sites are vital for interactions with other proteins like calreticulin and NSF.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Structural Biology

Background:

  • The GABA(A) receptor-associated protein (GABARAP) is essential for intracellular protein trafficking.
  • GABARAP is anchored to cellular membranes via C-terminal lipidation.
  • The three-dimensional structure of GABARAP is known, but its complexes with interaction partners are less understood.

Purpose of the Study:

  • To investigate the structural basis of GABARAP interactions with other proteins.
  • To identify and characterize the binding sites involved in GABARAP complex formation.
  • To explore the functional relevance of these binding sites for GABARAP activity.

Main Methods:

  • Studies utilizing indole derivatives to probe GABARAP binding sites.
  • Analysis of GABARAP complex formation with its native ligand, calreticulin.
  • Modeling of GABARAP interaction with N-ethylmaleimide-sensitive factor (NSF).

Main Results:

  • GABARAP possesses two distinct hydrophobic binding sites, designated hp1 and hp2.
  • These hydrophobic sites are critical for GABARAP's interaction with calreticulin.
  • Structural modeling suggests that similar sites may mediate GABARAP binding to NSF.

Conclusions:

  • The identified hydrophobic binding sites (hp1 and hp2) are conserved across the GABARAP family.
  • Structural insights into these sites are crucial for understanding GABARAP's role in protein trafficking.
  • This research provides a foundation for further structural studies of GABARAP complexes.