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Related Concept Videos

Predicting Products: Substitution vs. Elimination02:52

Predicting Products: Substitution vs. Elimination

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When a nucleophile and an alkyl halide react, nucleophilic substitution and β-elimination reactions compete to generate products.
The following factors can influence the mechanisms competing against each other:
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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.
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Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
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Solvating Effects02:12

Solvating Effects

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An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Electrophiles02:28

Electrophiles

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This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
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Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Electrostatic Interactions Dictate Bile Salt Hydrolase Substrate Preference.

Kien P Malarney1, Pamela V Chang2,3,4,5

  • 1Department of Microbiology, Cornell University, Ithaca, New York 14853, United States.

Biochemistry
|October 26, 2023
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Summary
This summary is machine-generated.

Gut microbes modify bile acids, creating microbially conjugated bile acids (MCBAs). A specific enzyme shows a preference for MCBAs with aromatic side chains, revealing a novel interaction mechanism.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Metabolomics

Background:

  • The human gut microbiota produces metabolites that influence host physiology.
  • Bile acids are host metabolites modified by gut microbes.
  • Microbially conjugated bile acids (MCBAs) are a newly identified class of microbial metabolites.

Purpose of the Study:

  • To investigate the metabolic potential of MCBAs.
  • To determine the substrate specificity of bile salt hydrolases (BSHs) for MCBAs.
  • To elucidate the molecular basis for BSH-MCBA interactions.

Main Methods:

  • Detailed kinetic studies of BSH activity.
  • Molecular modeling of BSH-substrate interactions.
  • Phylogenetic analysis of BSH enzymes.

Main Results:

  • Identified a BSH exhibiting positive cooperativity specifically for aromatic MCBAs.
  • Demonstrated that a cation-π interaction underlies the BSH preference for aromatic MCBAs.
  • Predicted this BSH preference to be common among human gut microbial BSHs.

Conclusions:

  • BSHs play a crucial role in modifying bile acids in the gut.
  • Aromatic MCBAs represent a distinct substrate class for BSHs.
  • The cation-π interaction mechanism highlights the specificity of microbial metabolism in the gut.