This is a working overview of Glutathione, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-09-05. Anything still debated is marked as such rather than presented as settled.
Glutathione is a small tripeptide built from glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group, a linkage that resists ordinary peptidases. Cells make it in two ATP-dependent steps: gamma-glutamylcysteine synthetase joins glutamate and cysteine, then glutathione synthetase adds glycine. The pathway is feedback-inhibited by glutathione itself, so intracellular levels tend to stay within a narrow range. Because cysteine is often limiting, sulfur amino acid supply influences how much glutathione a cell can produce.
In its reduced form, glutathione carries a sulfhydryl group that can donate electrons. This property lets it act as a major cellular antioxidant and redox buffer. Glutathione peroxidase uses it to reduce hydrogen peroxide and lipid peroxides, while glutathione reductase regenerates the reduced form using NADPH. The ratio of reduced glutathione to glutathione disulfide is widely used as an indicator of oxidative stress, though the ratio changes with compartment, cell type, and sample handling. Oxidized glutathione can also form mixed disulfides with proteins, affecting their activity.
Cells synthesize glutathione through two ATP-dependent enzymatic steps. The first step combines glutamate and cysteine to form gamma-glutamylcysteine, catalyzed by glutamate-cysteine ligase. The second step adds glycine, producing the complete tripeptide, catalyzed by glutathione synthetase. Glutathione itself can inhibit the first enzyme, providing negative feedback when levels are high. Because cysteine is often limiting, its availability influences how quickly the pathway proceeds. These reactions occur in the cytosol, and the resulting glutathione can be distributed to other compartments.
Glutathione functions in redox balance, detoxification, and sulfur amino acid storage. It participates in reactions that help maintain ascorbate and protein thiol status. The molecule serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. These enzymes reduce peroxides and conjugate electrophiles, respectively. Glutathione also contributes to the metabolism of xenobiotics and to the transport of cysteine between tissues. How interorgan transport and tissue-specific regulation shape whole-body pools remains an active area of study.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for the neutral molecule |
| Appearance | White crystalline powder | Often hygroscopic; protect from moisture |
| Water solubility | Soluble in water | Reported values vary with purity and form |
| Alternative names | GSH, reduced glutathione | GSH specifies the thiol form |
Within cells, glutathione serves as a cofactor for glutathione peroxidases and glutathione S-transferases. These enzymes reduce hydrogen peroxide and organic peroxides or conjugate electrophilic compounds to the thiol group. The resulting conjugates can be exported and processed through mercapturic acid pathways. Glutathione also contributes to protein thiol homeostasis and to recycling of other antioxidants such as ascorbate. Its precise roles vary by tissue, and many regulatory effects observed in laboratory systems remain difficult to quantify in whole organisms.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It occurs in nearly all living cells, with highest concentrations in liver, kidney, and red blood cells, and exists in reduced (GSH) and oxidized disulfide (GSSG) forms. The cysteine thiol group enables reversible oxidation and reduction reactions. This property makes glutathione a central participant in cellular redox balance. The balance between these forms is often used as an indicator of oxidative stress.
Glutathione synthesis proceeds in two ATP-dependent steps catalyzed by glutamate-cysteine ligase and glutathione synthetase. The first step joins glutamate and cysteine to form gamma-glutamylcysteine and is generally rate-limiting. The second step adds glycine to complete the tripeptide. Cysteine availability, feedback inhibition by glutathione, and oxidative conditions influence flux through this pathway. The pathway is conserved across many organisms, and degradation by gamma-glutamyl transpeptidase and related peptidases recycles amino acids for new synthesis.
Glutathione supports several cellular processes beyond direct antioxidant action. It serves as a cofactor for glutathione peroxidase and glutathione S-transferase enzymes, which reduce peroxides and conjugate electrophiles, respectively. The molecule also acts as a reservoir of cysteine, an amino acid that can limit protein synthesis and redox signaling. In human nutrition, oral glutathione is sold as a supplement, but how much intact glutathione reaches tissues after ingestion remains an active research question. Clinical claims about supplementation are not uniformly supported by controlled trials.
Glutathione is a small tripeptide built from glutamic acid, cysteine, and glycine. Its peptide bond between glutamate and cysteine involves the gamma-carboxyl group rather than the usual alpha-carboxyl group. This structure gives the molecule a reactive thiol on the cysteine residue. The reduced form, often abbreviated GSH, is the predominant intracellular species in many cell types. Because the thiol can donate electrons, glutathione participates in redox chemistry and in the conjugation of reactive molecules.
=== Animal use === Nitrofurazone is indicated for topical use in dogs, cats, and horses, for the treatment or prophylactic treatment of superficial bacterial infections, burns, and cutaneous ulcers. Preparations for treating infections, such as fin rot, in ornamental fish are also still commercially available. The use of nitrofurazone, or related compounds, in animals raised for human consumption has been strictly banned.
McMillan responded, "at this point, Marvel's brand is such that I'm not sure it can offer up something like [the trailer] without it seeming like a crushing disappointment ... part of Marvel's brand is that it doesn't offer the kind of run-of-the-mill superhero movie that you're talking about, that it's ... at least different enough to tweak and play with the genre somehow ... The fact that there's such upset about this trailer being ... well, okay ... suggests to me that the audience is expecting something to knock their socks off." Doran concluded, "That does seem to be the point here—the expectations fans now have for everything Marvel Studios ... [and] Marvel is going to eventually falter." After seeing the portrayal of Yellowjacket in Ant-Man, the antagonist of the film, McMillan noted,
== Society and culture == Chlordiazepoxide is the drug referenced in the Netflix series "The Queen's Gambit," under the commercial name Librium. It also appears prominently in the HBO series "The Pitt." In “Infinite Jest”, by David Foster Wallace, a nurse “negotiated a trade of shoes for Librium” with the character Tiny Ewell. In the first episode of Yes, Minister, Jim Hacker tells his wife Annie to take a Librium when she couldn't find a cigarette.
=== Energy intake === 5-HT2C receptor agonists reduce appetite by working on serotonin receptors in a region of the brain called the hypothalamus. Lorcaserin (Belviq) was FDA approved for weight loss but was withdrawn from the market because a safety clinical trial shows an increased occurrence of cancer. Cannabinoid receptor antagonists were developed to treat obesity because researchers noticed that cannabinoid agonists (such as THC, the main pharmacologically active component of cannabis), increased appetite. However, some drugs in this class such as rimonabant were withdrawn or ceased development due to concerns about mental health and suicide. More selective drugs—some are in development that act only in peripheral tissues, not the brain—may be able to achieve this result with fewer adverse effects. GLP-1 agonists such as tirzepatide, semaglutide, and liraglutide slow gastric emptying and also have neurologically driven effects on appetite. It is unknown if GLP-1 agonists or dual/triple agonists of GLP-1 and/or the glucagon or GIP receptors act solely by reducing energy intake or if they also increase energy expenditure. Setmelanotide is an agonist of the melanocortin 4 receptor and is used in people with certain rare genetic conditions that cause obesity. It is less effective and not approved for general obesity.
Sources: en.wikipedia.org
On 6 January 1984, United Nations Security Council Resolution 546 was adopted with thirteen votes in favour and two abstentions, by the US and UK. The resolution condemned Operation Askari and demanded South Africa's immediate and unconditional withdrawal from Angola. An earlier draft of the same text imposing mandatory trade sanctions on South Africa until it ceased cross-border raids was abandoned under American pressure. The Soviet Union announced that it had reached yet another, more comprehensive agreement with Angola to bolster FAPLA's defence capabilities, and delivered the public warning to South Africa that "further aggression cannot be left unpunished".
non-coding DNA (ncDNA) Any segment of DNA that does not encode a sequence that may ultimately be transcribed and translated into a protein. In most organisms, only a small fraction of the genome consists of protein-coding DNA, though the proportion varies greatly between species. Some non-coding DNA may still be transcribed into functional non-coding RNA (as with transfer RNAs) or may serve important developmental or regulatory purposes; other regions (as with so-called "junk DNA") appear to have no known biological function.
=== Art === A form of blotter paper commonly known as watercolor paper is produced for its absorbent qualities, allowing much better absorption of water and pigments than standard art or drawing papers. Although usually categorized as separate from blotting paper, differences in the constituents and thickness of blotting paper and watercolor paper are subtle, and making a distinction between the two is unnecessary as the production process is nearly identical.
The analysis of the complete primary sequence of a protein using only one protease is usually not possible. In those cases the digestion of the target protein in several approaches with different enzymes is recommended. The resulting overlapping peptides permit the assembly of the complete sequence of the protein. For the digestion the proteins fixed in the matrix of the gel have to be made accessible for the protease. The permeation of the enzyme to the gel is believed to be facilitated by the dehydration of the gel pieces by treatment with acetonitrile and subsequent swelling in the digestion buffer containing the protease. This procedure relies on the presumption that the protease permeates to the gel by the process of swelling. Different studies about the penetration of the enzymes to the gel showed the process to be almost completely driven by diffusion. The drying of the gel does not seem to support the process. Therefore, the improvement of the in-gel digestion has to be achieved by the reduction of the way of the enzyme to its substrate e.g. by cutting the gel to pieces as small as possible. Usually, the in-gel digestion is run as an overnight process. For the use of trypsin as protease and a temperature of 37 °C the time of incubation found in most protocols is 12-15 h. However, experiments about the duration of the digestion process showed that after 3 h there is enough material for successful mass spectrometric analysis.
The two main standalone spectroscopy techniques for forensic chemistry are FTIR and AA spectroscopy. FTIR is a nondestructive process that uses infrared light to identify a substance. The attenuated total reflectance sampling technique eliminates the need for substances to be prepared before analysis. The combination of nondestructiveness and zero preparation makes ATR FTIR analysis a quick and easy first step in the analysis of unknown substances. To facilitate the positive identification of the substance, FTIR instruments are loaded with databases that can be searched for known spectra that match the unknown's spectra. FTIR analysis of mixtures, while not impossible, presents specific difficulties due to the cumulative nature of the response. When analyzing an unknown that contains more than one substance, the resulting spectra will be a combination of the individual spectra of each component. While common mixtures have known spectra on file, novel mixtures can be difficult to resolve, making FTIR an unacceptable means of identification. However, the instrument can be used to determine the general chemical structures present, allowing forensic chemists to determine the best method for analysis with other instruments. For example, a methoxy group will result in a peak between 3,030 and 2,950 wavenumbers (cm−1). Atomic absorption spectroscopy (AAS) is a destructive technique that is able to determine the elements that make up the analyzed sample.
Sources: en.wikipedia.org
== Nutrition == NATO bases the nutritional content requirement on a reference soldier weighing 79 kg (174 lb), who on normal operations would have an energy expenditure of approximately 3,600 kcal per day. For combat operations, energy expenditure is estimated to be 4,900 kcal per day; however, this is seen to be a worst-case scenario.
=== InPen === The InPen is a reusable, bluetooth-enabled insulin pen, manufactured by Medtronic, that can connect to Dexcom CGM systems. The InPen can connect to the G6 and G7 through the InPen app, the Apple iPhone's Heath app, and on the Apple Watch.
An aldehyde tag is a short peptide tag that can be further modified to add fluorophores, glycans, PEG (polyethylene glycol) chains, or reactive groups for further synthesis. A short, genetically-encoded peptide with a consensus sequence LCxPxR is introduced into fusion proteins, and by subsequent treatment with the formylglycine-generating enzyme (FGE), the cysteine of the tag is converted to a reactive aldehyde group. This electrophilic group can be targeted by an array of aldehyde-specific reagents, such as aminooxy- or hydrazide-functionalized compounds.
=== Spotify === In May 2015, Starbucks entered a partnership with music streaming service Spotify. The partnership entailed giving U.S.-based employees a Spotify premium subscription and to help influence the music played in store via playlists made using Spotify. Starbucks was also given its own curated Spotify playlist to be featured on Spotify's mobile app.
== Activation and deactivation == MCH neurons depolarize in response to high glucose concentrations. This mechanism seems to be related to glucose being used as a reactant to form ATP, which also causes MCH neurons to depolarize. The neurotransmitter, glutamate, also causes MCH neurons to depolarize, while another neurotransmitter, GABA, causes MCH neurons to hyperpolarize. Orexin also depolarizes MCH neurons. MCH neurons seems to have an inhibitory response to MCH, but does not cause the neurons to become hyperpolarized. Norepinephrine has an inhibitory effect on MCH neurons as does acetylcholine. MCH neurons hyperpolarize in response to serotonin. Cannabinoids have an excitatory effect on MCH neurons. Some research has shown that dopamine has an inhibitory effect on MCH neurons, but further research is needed to fully characterize this interaction.
Sources: en.wikipedia.org
It is a tripeptide of glutamate, cysteine, and glycine. The glutamate-cysteine bond is unusual because it forms through the gamma-carboxyl group.
It reflects the balance between oxidant exposure and antioxidant capacity. The ratio is not a direct clinical diagnosis and depends on the tissue and sample method.
No. It also participates in detoxification, amino acid transport, and protein modification. Its roles vary by cell type and compartment.
Glutathione is built from three amino acids: glutamate, cysteine, and glycine. The linkage involves the gamma-carboxyl group of glutamate rather than the alpha-carboxyl group, which is unusual for peptides. This structure protects the bond from some common peptidases.