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Protein Organization01:24

Protein Organization

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....
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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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Structure of Amines01:19

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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
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A novel method for predicting antioxidant activity based on amino acid structure.

Andrew R Garrett1, Evita G Weagel1, Andrés D Martinez1

  • 1Department of Microbiology and Molecular Biology, Brigham Young University, 855 WIDB, Provo, UT 84602, USA.

Food Chemistry
|April 16, 2014
PubMed
Summary

Researchers identified key structural features predicting antioxidant activity in compounds. Sp(2)-hybridized carbons, valence electron to carbon ratio, and conjugated double bonds are crucial for reducing oxidative stress and chronic disease risk.

Keywords:
AntioxidantsChemical structureFunctionORAC assay

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Medicinal Chemistry

Background:

  • Oxidative stress is linked to chronic diseases like heart disease and cancer.
  • Understanding antioxidant structural properties is crucial for developing effective interventions.
  • Few studies have systematically examined the structural basis of antioxidant potency.

Purpose of the Study:

  • To identify specific structural characteristics that confer potent antioxidant activity.
  • To develop a predictive model for antioxidant activity based on molecular structure.
  • To explore structure-activity relationships across different compound classes.

Main Methods:

  • Utilized the Oxygen Radical Absorbance Capacity (ORAC) assay to measure antioxidant activity.
  • Examined 20 essential and non-essential amino acids.
  • Developed a simplified amino acid model for predicting antioxidant activity in non-amino acid compounds, including chalcones and nitrones.

Main Results:

  • Identified sp(2)-hybridized carbons as the most consistent predictors of antioxidant activity.
  • Found that the valence electron to carbon ratio and the length of conjugated double bonds are significant structural determinants.
  • Observed these trends across amino acids, chalcones, and nitrones.

Conclusions:

  • Specific molecular structural features, particularly sp(2)-hybridized carbons, are key determinants of antioxidant capacity.
  • The findings provide a foundation for designing novel antioxidant compounds.
  • Further research is needed to refine predictive models and explore complex relationships.