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Related Concept Videos

Phase II Reactions: Methylation Reactions01:17

Phase II Reactions: Methylation Reactions

Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
Dose-Response Relationship: Selectivity and Specificity01:25

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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
The Two-State Receptor Model01:29

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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.
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Multiple N-methylation by a designed approach enhances receptor selectivity.

Jayanta Chatterjee1, Oded Ovadia, Grit Zahn

  • 1Center for Integrated Protein Science at the Department Chemie, Lehrstuhl II für Organische Chemie, Technische Universität München, Lichtenbergstrasse 4, Garching D85747, Germany.

Journal of Medicinal Chemistry
|November 2, 2007
PubMed
Summary
This summary is machine-generated.

N-methylation of a cyclic peptide ligand significantly improved its selectivity for specific integrin receptors. This enhancement is attributed to reduced backbone flexibility, offering a new strategy for targeted drug design.

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Area of Science:

  • Medicinal Chemistry
  • Biochemistry
  • Molecular Biology

Background:

  • Integrin receptors play crucial roles in cellular processes.
  • Unselective ligands limit therapeutic applications.
  • Developing selective integrin ligands is a key challenge.

Purpose of the Study:

  • To enhance the selectivity of a cyclic peptide integrin ligand.
  • To investigate the structural basis of improved integrin receptor selectivity.

Main Methods:

  • Sequential N-methylation of solvent-exposed amide bonds in a cyclic peptide.
  • Assessing ligand selectivity across integrin receptor subtypes (alpha5beta1, alphavbeta3, alphaIIbbeta3).
  • Computational conformational and molecular docking studies.

Main Results:

  • N-methylation dramatically increased ligand selectivity for specific integrin subtypes.
  • Reduced backbone flexibility in the N-methylated peptide was observed.
  • Docking studies indicated that reduced flexibility is the primary driver of selectivity.

Conclusions:

  • Designed N-methylation is an effective strategy to enhance integrin ligand selectivity.
  • Reduced conformational flexibility is key to achieving receptor subtype specificity.
  • This approach holds promise for developing targeted integrin-based therapeutics.