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Preparation and Reactions of Thiols

Preparation and Reactions of Thiols

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.

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

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.

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...

Redox Reactions

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...

Redox Reactions

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...

Structure and Nomenclature of Thiols and Sulfides

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...

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Related Experiment Video

Updated: Apr 26, 2026

Combining Non-reducing SDS-PAGE Analysis and Chemical Crosslinking to Detect Multimeric Complexes Stabilized by Disulfide Linkages in Mammalian Cells in Culture

Combining Non-reducing SDS-PAGE Analysis and Chemical Crosslinking to Detect Multimeric Complexes Stabilized by Disulfide Linkages in Mammalian Cells in Culture

Published on: May 2, 2019

Intermolecular disulfide-dependent redox signalling.

Marrit Putker¹, Harmjan R Vos¹, Tobias B Dansen¹

¹*Molecular Cancer Research, Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584CG Utrecht, The Netherlands.

Biochemical Society Transactions

|August 12, 2014

Summary

This summary is machine-generated.

Reactive oxygen species, like hydrogen peroxide (H2O2), act as signaling molecules. This redox signaling regulates proteins through cysteine oxidation, impacting cellular processes.

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Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry

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Published on: March 24, 2012

Area of Science:

Biochemistry
Cell Biology
Molecular Biology

Background:

Reactive oxygen species (ROS), including hydrogen peroxide (H2O2), are increasingly recognized for their signaling roles beyond cellular damage.
H2O2 is generated during growth factor signaling and mitochondrial respiration, influencing cellular redox states.

Purpose of the Study:

To review the phenomenon of redox signaling mediated by cysteine oxidation.
To highlight proteins regulated by intermolecular disulfide formation.
To discuss a novel screening method for these interactions and the regulation of FOXO4.

Main Methods:

Literature review of redox signaling mechanisms.
Discussion of protein regulation via intermolecular disulfide bonds.
Examination of a new method for screening disulfide interactions.

Main Results:

Cysteine oxidation by H2O2 leads to specific, reversible post-translational modifications.
Intermolecular disulfide formation is a key mechanism regulating protein function.
FOXO4 transcription factor regulation by disulfide bonds with TNPO1 and p300/CBP is detailed.

Conclusions:

Redox signaling through cysteine oxidation is crucial for diverse physiological processes.
Intermolecular disulfide bonds represent a significant regulatory mechanism for proteins.
Understanding these interactions, including FOXO4 regulation, is vital for cellular function.