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Related Concept Videos

Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Oxidation of Phenols to Quinones01:17

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
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Types of Enols and Enolates01:19

Types of Enols and Enolates

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Aldehydes and ketones form enols, although only about 1% of the enol is present at the equilibrium for simple monocarbonyl compounds. The enol form is undetectable for acetaldehyde, present as only 1.5 × 10−4 % of acetone, and present as only 1.2% of cyclohexanone. Two kinds of regioisomeric enols are possible for unsymmetrical ketones, and their net composition is 1% at equilibrium. This instability is due to the lower bond energy of C=C than the C=O group. The additional...
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Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins
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Stabilizing hydroperoxyflavin intermediate formation via a peptide appendage: a neutral flavoenzyme model.

M S S Vinod Mouli1, Dipayan Mondal1, Kusum Kumari1

  • 1Department of Chemistry, Indian Institute of Technology-Hyderabad, Kandi-502285, India. sksingh@chy.iith.ac.in.

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Researchers designed a bioinspired peptide-flavin mimic to stabilize key intermediates in monooxygenase catalysis. The flavopeptide model (Fl-G) demonstrated nearly quantitative catalytic efficiency, highlighting the peptide

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Area of Science:

  • Bioinorganic Chemistry
  • Enzyme Mimicry
  • Catalysis

Background:

  • Monooxygenases are crucial enzymes catalyzing oxidation reactions.
  • Stabilization of the hydroperoxyflavin intermediate is key to monooxygenase activity.
  • Designing synthetic mimics is essential for understanding and improving catalytic processes.

Purpose of the Study:

  • To design and investigate a bioinspired mimic for stabilizing the hydroperoxyflavin intermediate.
  • To evaluate the monooxygenase-like catalytic properties of novel flavopeptide analogues.
  • To understand the role of peptide appendages in enhancing catalytic efficiency.

Main Methods:

  • Covalent linkage of peptide appendages to the C7-position of an isoalloxazine core.
  • Synthesis of flavopeptide analogues (Fl-G, Fl-F, Fl-P, Fl-βA).
  • Theoretical studies to support experimental observations on intermediate stabilization.

Main Results:

  • The presence and identity of the peptide appendage significantly influenced catalytic efficiency.
  • Fl-G, a simple flavopeptide model, achieved nearly quantitative catalytic efficiency.
  • Theoretical studies confirmed the importance of conformation and accessibility for intermediate stabilization.

Conclusions:

  • Bioinspired flavopeptide mimics can effectively stabilize the hydroperoxyflavin intermediate.
  • Peptide appendages are crucial for achieving high catalytic efficiency in these mimics.
  • The flavopeptide model (Fl-G) represents a promising advancement in biomimetic catalysis.