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Homocysteine thiolactone (HTL) is an organosulfur compound with the formula H 2 NCHC(O)SCH 2 CH 2. It is the thiolactone (intramolecular thioester ) of homocysteine . It is produced by methionyl-tRNA synthetase in an error-editing reaction that prevents translational incorporation of homocysteine into proteins .
The activation of the drug clopidogrel (top left) gives a thiolactone, which ring-opens. [3] Thiolactones are intermediates in the activation of some drugs. [4] In nature, the most common thiolactone is homocysteine thiolactone. It is produced from homocysteine. It may play a role in protein damage. [5]
Risk factors known as of 2010 are: Quantity of alcohol taken: Consumption of 60–80 g per day (14 g is considered one standard drink in the US, e.g. 1 + 1 ⁄ 2 US fl oz or 44 mL hard liquor, 5 US fl oz or 150 mL wine, 12 US fl oz or 350 mL beer; drinking a six-pack of 5% ABV beer daily would be 84 g and just over the upper limit) for 20 years or more in men, or 20 g/day for women ...
Alcoholic ketoacidosis (AKA) is a specific group of symptoms and metabolic state related to alcohol use. [3] Symptoms often include abdominal pain, vomiting, agitation, a fast respiratory rate, and a specific "fruity" smell. [2] Consciousness is generally normal. [1] Complications may include sudden death. [1]
Alcohol withdrawal syndrome (AWS) is a set of symptoms that can occur following a reduction in or cessation of alcohol use after a period of excessive use. [1] Symptoms typically include anxiety , shakiness , sweating, vomiting, fast heart rate , and a mild fever. [ 1 ]
Extreme doses may result in a respiratory depression, coma, or death. [3] Complications may include seizures, aspiration pneumonia, low blood sugar, and injuries or self-harm such as suicide. [3] [4] Alcohol intoxication can lead to alcohol-related crime with perpetrators more likely to be intoxicated than victims. [12]
Symptoms may present acutely after a large amount of alcoholic intake in a short time period, or after years of excess alcohol intake. Signs and symptoms of alcoholic hepatitis include jaundice (yellowing of the skin and eyes), ascites (fluid accumulation in the abdominal cavity ), fatigue and hepatic encephalopathy ( brain dysfunction due to ...
Homocysteine can cyclize to give homocysteine thiolactone, a five-membered heterocycle. Because of this "self-looping" reaction, homocysteine-containing peptides tend to cleave themselves by reactions generating oxidative stress. [12] Homocysteine also acts as an allosteric antagonist at Dopamine D 2 receptors. [13]