If you have been reading about thiol and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-09-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
Biosynthesis proceeds in two ATP-dependent steps. First, glutamate-cysteine ligase joins glutamate and cysteine. Second, glutathione synthetase adds glycine to the intermediate. The pathway is regulated by cysteine availability, enzyme expression, and feedback inhibition by glutathione itself. Liver tissue has a particularly high capacity for synthesis and export. Because the molecule is made inside cells, circulating glutathione reflects a balance of release, uptake, and breakdown rather than simple dietary supply.
Functionally, glutathione supports redox balance by donating electrons and becoming oxidized. It also serves as a cofactor for enzymes such as glutathione peroxidases and glutathione S-transferases. These enzymes participate in peroxide reduction and in conjugation reactions that help process reactive molecules. Separate from antioxidant roles, glutathione can modify protein cysteines through S-glutathionylation, influencing enzyme activity and signaling. Research continues to examine how these chemical roles translate into whole-organism effects.
Because GSH is central to redox balance, its status is studied in aging, liver disease, neurodegenerative conditions, and metabolic disorders. Observational studies often report lower GSH or higher GSSG in affected tissues, but such associations do not establish that raising glutathione changes disease outcomes. Oral glutathione is digested into amino acids, and whether intact absorption occurs remains debated; precursors such as N-acetylcysteine and cysteine donors are also investigated. Regulatory agencies generally treat glutathione as a dietary supplement, not an approved drug, and clinical claims require evidence from controlled trials.
Glutathione is a small tripeptide composed of glutamate, cysteine, and glycine, with the unusual gamma-glutamyl linkage between glutamate and cysteine. Its cysteine thiol group makes it a major non-enzymatic antioxidant in cells. The reduced form, GSH, predominates in most intracellular compartments, while the oxidized disulfide form, GSSG, is produced when GSH reduces reactive oxygen species. Intracellular concentrations often reach millimolar levels, whereas plasma concentrations are much lower, typically in the low micromolar range. This gradient reflects active synthesis, transport, and consumption rather than passive distribution.
Synthesis occurs in two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine to complete the tripeptide. The pathway is feedback-inhibited by GSH and limited by cysteine availability, so cysteine supply often constrains production. Once formed, GSH participates in redox buffering, xenobiotic conjugation, and protein glutathionylation. Glutathione peroxidase uses GSH to reduce hydrogen peroxide and lipid peroxides, yielding GSSG, while glutathione reductase regenerates GSH using NADPH. Glutathione S-transferases conjugate electrophiles to GSH, supporting detoxification and excretion.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione (reduced form) | Often abbreviated GSH |
| Chemical class | Tripeptide | Contains glutamate, cysteine, and glycine |
| Molecular formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical laboratory-grade solid |
Several analytical methods can quantify glutathione, including high-performance liquid chromatography (HPLC) with UV or fluorescence detection for separating GSH and GSSG. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) offers higher specificity and sensitivity, often detecting nanomolar concentrations. The enzymatic recycling assay, often called the Tietze method, measures total glutathione by coupling reduction of GSSG to a colorimetric or fluorometric readout. Capillary electrophoresis and electrochemical detection are also used in specialized laboratories. Each method has distinct advantages and limitations regarding throughput, cost, and susceptibility to interference.
Interpreting glutathione measurements requires attention to pre-analytical variables. The GSSG concentration in a sample can rise artificially during storage or processing, making the GSH/GSSG ratio unreliable if not controlled. Reference ranges vary by specimen type, assay, and population, so comparisons across studies are difficult. Plasma glutathione is low and sensitive to hemolysis, while whole blood reflects primarily erythrocyte content. Many studies measure total glutathione rather than the reduced and oxidized forms separately, which limits conclusions about redox status.
Glutathione is present in most tissues, with especially high concentrations in the liver. It also serves as a cofactor for some enzymes and helps transport amino acids across cell membranes. In plants and microorganisms, glutathione contributes to stress responses and metal handling. The molecule is synthesized in two ATP-dependent steps, first producing gamma-glutamylcysteine and then adding glycine. Because cysteine availability often limits synthesis, dietary and metabolic factors can influence glutathione levels. Research continues to examine how these levels relate to health and disease.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group of glutamate rather than the alpha-carboxyl group. This unusual linkage protects the molecule from many common peptidases. The cysteine side chain carries a thiol group that can undergo reversible oxidation. Because of this thiol, glutathione participates in redox reactions and helps maintain the reducing environment inside most cells in living systems.
== Europe == German centenarians receive a letter of congratulations from the president of Germany. In Ireland, centenarians can receive a €2,540 "Centenarians' Bounty" and a letter from the president of Ireland, even if they are resident abroad. Irish people celebrating their 101st birthday may also receive a special silver minted coin with a quote by a famous Irish writer or poet. Centenarians born in Italy receive a letter of congratulations from the president of Italy. In the Netherlands, the monarch and their commissioner sends a letter on the 100th birthday and on every birthday beginning with the 105th. Swedish centenarians receive a telegram from the king and queen of Sweden.
=== Infants === In neonates (newborn infants), brown fat makes up about 5% of the body mass and is located on the back, along the upper half of the spine and toward the shoulders. It is of great importance to avoid hypothermia, as lethal cold is a major death risk for premature neonates. Numerous factors make infants more susceptible to cold than adults:
Emotional dysregulation is a core feature of BPD and it is characterized by a difficulty in effectively managing emotional states. It may involve high sensitivity to emotional stimuli, heightened emotional intensity, large and rapid mood shifts, tendency for negative emotions, high affective empathy but low cognitive empathy, and a slow return to baseline after emotional arousal. Emotional dysregulation extends beyond emotions, affecting cognition, relationships, and behavior. Deficits in emotion regulation strategies are observed in BPD. These include resistance to accepting emotional responses, low flexibility to changing strategies, difficulty in identifying emotions, as well as a deficit in goal-directed behavior, and in using healthy coping strategies. Maladaptive strategies commonly used to regulate their emotions include self-harm, rumination, avoidance, and thought suppression. Emotional dysregulation is thought to be caused by an imbalance in the limbic system and the prefrontal cortex, particularly in the amygdala. Dialectical behavior therapy can be employed to help with emotional dysregulation.
== Stock exchange listing and later history == Mondobiotech's common shares began trading on the SIX Swiss Exchange on 26 August 2009 under the symbol RARE. The first day's closing price was CHF 392. SIX records a market capitalization of approximately CHF 490 million in its historical listing data. In its account of the listing, the Swiss business magazine BILANZ reported an implied value of approximately CHF 2.6 billion for the entire company at the first-day closing price, noting that only a small number of shares had traded that day. No new shares were issued as part of the initial listing. BILANZ reported in 2011 that the company had accumulated losses and had not yet brought a medicine to market. Mondobiotech changed its name to THERAMetrics in June 2013 and completed its combination with Pierrel Research International in September 2013. THERAMetrics subsequently combined with Relief Therapeutics SA and changed its corporate name to Relief Therapeutics Holding AG in July 2016.
== Applications == The properties of these gastropod inspired adhesives allow for various applications ranging from topical use to the adhesion of medical devices due to their ability to stick well in wet environments and their biocompatibility. In terms of wound healing, DBHA was shown in animal studies to improve healing compared to commonly used biogels such as Tisseel, BioGlue, Histoacryl, Dermabond, Surgiseal, Coseal, and DuraSeal. Similarly, gastropod mucus extracts have been found to accelerate the healing of second degree burns in mice likely due to their antimicrobial, anti inflammatory, and antioxidant properties. These mucus extracts also show strong antibacterial effects against gram positive and gram negative bacteria due to their peptides. Aside from external use, these adhesives have also been tested for internal medical uses. For example, they were used as sealants in porcine hearts and were able to successfully prevent leakage even at strains up to 100%. They are also capable of sticking to moving tissue as shown when an actuator was successfully attached to myocardium surfaces. Because they work so well in wet conditions, they have potential for dental applications where moisture will always be present. There are various other possible applications in which these gastropod inspired adhesives can be used such as oncology by inhibiting the growth of melanoma cancer cells and drug delivery by protecting the drug and extending its half life.
Sources: en.wikipedia.org
11 February – Azhar Ali, Labour's candidate in the Rochdale by-election, apologises after a recording of him reportedly saying that Israel had "allowed" the deadly attack by Hamas gunmen on 7 October was obtained by The Mail on Sunday. Labour condemns his remarks but continues to offer its support to his candidacy. 12 February – Labour withdraws its support for Rochdale candidate Azhar Ali. Tracey Crouch, MP for Chatham and Aylesford, announces she is standing down from Parliament at the next general election. Prime Minister Rishi Sunak appears on an hour long GB News People's Forum, where a selected audience of undecided voters are invited to ask him questions. The programme is presented by Stephen Dixon. 13 February – Labour withdraws its support for Graham Jones, the former MP for Hyndburn, who was going to contest the seat at the next general election, after it emerges he attended a meeting at which Azhar Ali made comments about Israel. 14 February – Former Labour Party leader Neil Kinnock endorses Vaughan Gething to lead Welsh Labour as the next First Minister of Wales. Conservative MP Tobias Ellwood tells BBC Radio 4's PM programme that politicians cannot be viewed as "fair game" after a large-scale pro-Palestinian protest outside his family home. 15 February – By-elections take place in Wellingborough and Kingswood. Labour's Gen Kitchen takes Wellingborough, the Conservative Peter Bone's former seat, which he had held with a majority of more than 18,000.
The overall fold of Acutolysin A is composed of a twisted β-sheet core flanked by α-helices, forming the characteristic metzincin architecture. Central to this fold is the conserved “Met-turn”, a methionine-containing structural motif that stabilizes the active-site configuration. The three disulfide bonds in AaH I (Cys117–Cys197, Cys159–Cys181, and Cys157–Cys164) are strategically positioned to maintain this fold under physiological conditions and to resist thermal or proteolytic degradation. These disulfide linkages play a crucial role in preserving the shape of the catalytic cleft, ensuring maximal enzymatic activity even in harsh extracellular environments. At the active site is the HELGHNLGLH metalloproteinase motif, which binds a catalytic zinc ion in a tetrahedral geometry. Three histidine residues coordinate the zinc atom, while the fourth ligand is either a water molecule or hydroxide ion, which acts as the nucleophile in peptide bond hydrolysis. The active-site cleft forms a deep groove that accommodates collagen and laminin fibers, aligning them precisely for cleavage. This structural arrangement explains the exceptional potency of AaH I in degrading basement membranes.
Projected to go undrafted by Sports Illustrated, who criticized his lack of "balance, body control and ability in space," Kuper was ranked as the No. 28 offensive guard available in the 2006 NFL draft. Kuper was eventually selected in the fifth round, 161st overall, by the Denver Broncos. He was the highest selected North Dakota lineman since Todd Thomas in 1981. Kuper started 79-of-90 games played (68 at right guard) while playing his entire eight-year NFL career with the Broncos. On June 4, 2010, the Broncos announced that they had signed Kuper to a five-year deal worth $25.5 million. The new contract made him the second-highest-paid offensive lineman in Broncos' history, second only to former left tackle Matt Lepsis. In 2010, the Denver Broncos announced that Kuper had been selected as co-captain of the Broncos offense, along with Kyle Orton and Daniel Graham. During the regular season finale in 2011 against the Kansas City Chiefs, Kuper suffered a gruesome broken ankle that ended his season. That season Kuper made the Pro Bowl, but withdrew due to the injury and needed surgery. A three-time captain, Kuper was recipient of the Ed Block Courage Award in 2012 as voted on by his teammates. Kuper retired on March 11, 2014.
Encapsulins were discovered in 1994 as a new class of prokaryotic compartments. Prokaryotic cells usually lack membrane compartments typical for eukaryotes. They instead have numerous protein compartments that are capable of accumulating a large number of molecules. The encapsulin systems were first identified through the use of bioinformatics that linked capsid-like proteins to specific operons in bacterial and archaeal genomes. When protein nanocompartments were discovered in 1994, and later renamed encapsulins, they were found in the supernatant fluid of the Brevibacterium linens culture. This bacterium is present on human skin. Since 1994, over 6,000 systems have been identified across 31 bacterial and four archaeal phyla. Encapsulins have also been discovered to be found in extremophiles inhabiting hydrothermal vents. In 2008, encapsulins were identified as protein-based systems for compartmentalization, serving specific functions within cellular organisms. 2008 is also when they started to be called encapsulins. Recent advances in metagenomics, cryo-electron microscopy, and X-ray crystallography have expanded the known diversity and revealed more intricate details about the assembly and functionality of encapsulins.
Sources: en.wikipedia.org
Glutathione is a sulfur-containing tripeptide made from glutamate, cysteine, and glycine. It is found in most cells and participates in redox balance and detoxification reactions.
No. It is a tripeptide assembled from three amino acids. The term amino acid applies to the individual building blocks, not to the assembled molecule.
It is present in many tissues, with especially high amounts in liver. Intracellular concentrations are generally much higher than those found in blood plasma.
GSH is the reduced, thiol-containing form of glutathione, while GSSG is the oxidized disulfide dimer formed when two GSH molecules react. Cells maintain a high GSH-to-GSSG ratio under normal conditions. A shift toward GSSG is often interpreted as oxidative stress, though sample handling can affect the measured ratio.