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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Preparation and Reactions of Sulfides02:26

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Insights from the docked DoxDA Model with Thiosulphate.

Sujay Ray1, Angshuman Bagchi1

  • 1Department of Biochemistry and Biophysics, University of Kalyani - 741245, Nadia, West Bengal, India.

Bioinformation
|January 21, 2017
PubMed
Summary

This study reveals how Acidothiobacillus thiooxidans uses DoxD and DoxA proteins for thiosulphate oxidation, offering computational insights into sulphur cycling in bacteria lacking the sox operon.

Area of Science:

  • Biochemistry
  • Microbiology
  • Computational Biology

Background:

  • The global sulfur cycle relies on redox reactions of inorganic sulfur compounds.
  • Acidothiobacillus thiooxidans, a gamma-proteobacterium, appears to possess an alternative thiosulphate oxidation pathway independent of the canonical sulphur-oxidizing (sox) operon.

Purpose of the Study:

  • To elucidate the role of DoxD and DoxA proteins in the alternative thiosulphate oxidation pathway.
  • To computationally model and analyze the interaction of DoxD and DoxA with thiosulphate.

Main Methods:

  • Functional 3D models of conserved domains of DoxD and DoxA proteins were constructed.
  • Molecular dynamics (MD) simulations of the DoxDA protein complex were performed using GROMACS.
  • Analysis of residual binding modes, interactions (ionic and hydrogen bonds), and solvent accessibility was conducted.

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Main Results:

  • The DoxDA protein complex exhibited stability after 18ns of MD simulation.
  • Key interactions, including ionic and hydrogen bonds involving specific residues (Asp167 in DoxA, Arg18 in DoxD), were identified.
  • Four residues in DoxD (Trp32, Met33, Lys36, Asn140) were found to enhance DoxD-thiosulphate interaction.
  • Favorable interaction energy (deltaG = -222.016 kcal/mol) and increased conformational flexibility in DoxD suggest spontaneous and robust participation in thiosulphate oxidation.

Conclusions:

  • The DoxDA complex plays a crucial role in thiosulphate oxidation in Acidothiobacillus thiooxidans.
  • This study provides a computational basis for understanding sulphur oxidation mechanisms in bacteria lacking the sox operon.