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Conjugated Proteins02:50

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
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Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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Phase II Conjugation Reactions: Overview01:14

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Conjugation, a key component of phase II biotransformation reactions, is a vital process in drug detoxification. It involves transferring endogenous substances like glucuronic acid, sulfate, and glycine to drugs or their metabolites formed in phase I reactions. These conjugation reactions, often catalyzed by specific enzymes, transform potentially harmful metabolites into inactive, water-soluble forms easily excreted in urine or bile. By enhancing polarity and eliminating pharmacological...
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Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme...
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Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
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Multifunctional lipoic acid conjugates.

M Koufaki1, A Detsi, C Kiziridi

  • 1National Hellenic Research Foundation, Institute of Organic and Pharmaceutical Chemistry, 116 35 Athens, Greece. mkoufa@eie.gr

Current Medicinal Chemistry
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Alpha-lipoic acid (LA) derivatives and conjugates show enhanced therapeutic potential, acting as potent antioxidants and forming novel nanoparticles. Research focuses on designing hybrid molecules and functionalized nanomaterials for dual-action therapies.

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Area of Science:

  • Medicinal Chemistry
  • Nanotechnology
  • Pharmacology

Background:

  • Alpha-lipoic acid (LA) demonstrates therapeutic potential across various pathways.
  • LA's effects are often concentration-dependent, with derivatives and hybrids showing enhanced activity.
  • Hybrid molecules combining LA with other bioactive moieties offer multifunctional therapeutic benefits.

Purpose of the Study:

  • To review the design and synthesis of alpha-lipoic acid (LA) conjugates.
  • To explore novel molecules with dual modes of action.
  • To discuss the development of LA-based nanosized antioxidants, Self-Assembled Monolayers (SAMs), and Quantum Dots (QDs).

Main Methods:

  • Synthesis of LA-amide derivatives and LA-hybrid molecules.
  • Development of LA-functionalized nanoparticles, including nanospheres and nanoprodrugs.
  • Utilizing LA as a linker or surface ligand for gold nanoparticles and Quantum Dots (QDs).

Main Results:

  • LA amides and hybrid compounds exhibit increased biological activity compared to native LA.
  • Hybrid molecules possess combined antioxidant activity with neuroprotective, cardioprotective, anti-inflammatory, antidiabetic, and anticancer effects.
  • LA is effectively employed in creating functionalized nanoparticles like SAMs and water-soluble QDs.

Conclusions:

  • LA conjugates offer a promising strategy for developing potent drugs with dual therapeutic actions.
  • LA serves as a versatile platform for constructing advanced nanomedicine formulations.
  • The review highlights the expanding field of LA-based conjugates and nanomaterials for innovative therapeutic applications.