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Related Concept Videos

Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
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SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
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SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Structural Modification Endows Small-Molecular SN38 Derivatives with Multifaceted Functions.

Yi Dai1,2, Meng Qian1, Yan Li1

  • 1College of Pharmaceutical Science, Anhui Xinhua University, Hefei 230088, China.

Molecules (Basel, Switzerland)
|July 14, 2023
PubMed
Summary
This summary is machine-generated.

Structural modification of 7-ethyl-10-hydroxycamptothecin (SN38), a potent topoisomerase I inhibitor, is crucial for enhancing its anticancer properties. Research focuses on improving solubility, activity, and reducing toxicity for better drug development.

Keywords:
7-ethyl-10-hydroxycamptothecinstructural modificationtheranosticstumor targeting

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Area of Science:

  • Medicinal Chemistry
  • Oncology
  • Pharmacology

Background:

  • 7-ethyl-10-hydroxycamptothecin (SN38) is a highly active camptothecin derivative that inhibits topoisomerase I, showing promise in cancer therapy.
  • SN38 possesses intrinsic fluorescence, enabling its use as a theranostic reagent.
  • Limitations of SN38 include poor water solubility, high systemic toxicity, and limited efficacy against drug resistance and metastasis.

Purpose of the Study:

  • To review and analyze the progress in structural modification of SN38.
  • To explore strategies for improving SN38's solubility, enhancing its anticancer activity, and reducing its toxicity.
  • To provide insights for developing novel SN38-based anticancer drugs with multifunctional capabilities.

Main Methods:

  • Literature review of chemical modifications applied to SN38.
  • Analysis of structure-activity relationships and structure-toxicity relationships.
  • Evaluation of strategies for developing multifunctional SN38 derivatives.

Main Results:

  • Chemical modifications have shown potential in improving SN38's water solubility.
  • Strategies exist to increase the activity of SN38 against cancer cells, including resistant and metastatic types.
  • Modifications can also mitigate the systemic toxicity associated with SN38 administration.
  • Multifunctional SN38 derivatives are being developed for combined therapeutic and diagnostic applications.

Conclusions:

  • Structural modification of SN38 is a viable strategy to overcome its limitations for improved cancer treatment.
  • Further research into SN38's chemical modification holds significant potential for developing next-generation anticancer therapeutics.
  • Developing multifunctional SN38 derivatives can lead to more effective and targeted cancer therapies.