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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

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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...
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Ions as Acids and Bases02:54

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Drug-Receptor Bonds01:25

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Drug-receptor bonds are formed through various chemical forces when drugs interact with target cells. Covalent bonds, strong and irreversible, are exemplified by DNA-alkylating anticancer agents that inhibit cell division. However, such irreversible drug binding lacks selectivity and can modify the DNA of the surrounding healthy cells. Covalent binding often contributes to tissue toxicity, as seen with chloroform and paracetamol metabolites binding to the liver, causing hepatotoxicity.
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The Equilibrium Binding Constant and Binding Strength02:18

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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:
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Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Factors Affecting Protein-Drug Binding: Drug-Related Factors01:18

Factors Affecting Protein-Drug Binding: Drug-Related Factors

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Drug binding to proteins is a complex phenomenon influenced by various drug-related factors, each playing a significant role in the interaction between drugs and proteins within the body.
One crucial factor in drug-protein binding is the drug's lipophilicity or its affinity for fat. More lipophilic drugs tend to have higher binding extents. For example, highly lipophilic drugs like cloxacillin exhibit substantial protein binding, with as much as 95% of the drug binding to proteins. In...
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Peptide-based Identification of Functional Motifs and their Binding Partners
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Assessing Weak Anion Binding to Small Peptides.

Corinne L D Gibb1, Thien H Tran1, Bruce C Gibb1

  • 1Department of Chemistry, Tulane University School of Science and Engineering, New Orleans, Louisiana 70118, United States.

The Journal of Physical Chemistry. B
|April 9, 2024
PubMed
Summary
This summary is machine-generated.

Nuclear magnetic resonance (NMR) spectroscopy can quantify weak anion binding to peptides by analyzing N-H signal shifts. This method reveals that anions primarily interact with nonpolar peptide regions, not amide groups, offering insights into Hofmeister effects.

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Area of Science:

  • Biochemistry
  • Chemical Physics
  • Spectroscopy

Background:

  • Hofmeister effects describe how salts influence protein properties through water-salt and direct salt-protein interactions.
  • Direct salt-protein interactions are weak and difficult to quantify, often considered nonspecific.
  • Understanding these interactions is crucial for controlling protein behavior in various applications.

Purpose of the Study:

  • To demonstrate the utility of 1H NMR spectroscopy for assessing weak anion binding to peptides.
  • To quantify anion binding affinity using N-H signal shifts.
  • To elucidate the binding mechanism and location of anion-peptide interactions.

Main Methods:

  • Utilized pentapeptides as model systems.
  • Employed the H-dimension of nuclear magnetic resonance (NMR) spectroscopy to measure N-H signal shifts.
  • Analyzed shifts induced by anion association and point mutations.
  • Performed molecular dynamics (MD) simulations to support experimental findings.

Main Results:

  • Observed significant upfield N-H signal shifts upon anion association, indicating binding.
  • Demonstrated that these shifts are larger than those from ionic strength effects.
  • Found that anion binding is weak, with anions associating mainly with nonpolar peptide regions.
  • MD simulations corroborated the preferential interaction with nonpolar regions over amide groups.

Conclusions:

  • 1H NMR spectroscopy is a powerful tool for quantifying low-affinity anion binding to peptides.
  • Anion binding to peptides is primarily driven by interactions with nonpolar regions.
  • These findings provide a benchmark for studying anion binding in more complex biological systems and understanding Hofmeister effects.