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Coenzyme A
Coenzyme A (CoA, SHCoA, CoASH) is a coenzyme, notable for its role in the Fatty acid metabolism#Synthesis, synthesis and Fatty acid metabolism#.CE.B2-Oxidation, oxidation of fatty acids, and the oxidation of pyruvic acid, pyruvate in the citric acid cycle. All genomes sequenced to date encode enzymes that use coenzyme A as a Substrate (chemistry), substrate, and around 4% of cellular enzymes use it (or a thioester) as a substrate. In humans, CoA biosynthesis requires cysteine, pantothenic acid, pantothenate (vitamin B5), and adenosine triphosphate (ATP). In acetyl-CoA, its acetyl form, coenzyme A is a highly versatile molecule, serving metabolic functions in both the Anabolism, anabolic and Catabolism, catabolic pathways. Acetyl-CoA is utilised in the post-translational regulation and allosteric regulation of pyruvate dehydrogenase and carboxylase to maintain and support the partition of Pyruvic acid, pyruvate synthesis and degradation. Discovery of structure Coenzyme A was ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molar Attenuation Coefficient
In chemistry, the molar absorption coefficient or molar attenuation coefficient () is a measurement of how strongly a chemical species absorbs, and thereby attenuates, light at a given wavelength. It is an intrinsic property of the species. The International System of Units, SI unit of molar absorption coefficient is the square metre per Mole (unit), mole (), but in practice, quantities are usually expressed in terms of Molar concentration#Units, M−1⋅cm−1 or L⋅mol−1⋅cm−1 (the latter two units are both equal to ). In older literature, the cm2/mol is sometimes used; 1 M−1⋅cm−1 equals 1000 cm2/mol. The molar absorption coefficient is also known as the molar extinction coefficient and molar absorptivity, but the use of these alternative terms has been discouraged by the International Union of Pure and Applied Chemistry, IUPAC. Beer–Lambert law The absorbance of a material that has only one absorbing species also depends on the pathlength and the concentratio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyruvate Dehydrogenase
Pyruvate dehydrogenase is an enzyme that catalyzes the reaction of pyruvate and a lipoamide to give the acetylated dihydrolipoamide and carbon dioxide. The conversion requires the coenzyme thiamine pyrophosphate. Pyruvate dehydrogenase is usually encountered as a component, referred to as E1, of the pyruvate dehydrogenase complex (PDC). PDC consists of other enzymes, referred to as E2 and E3. Collectively E1-E3 transform pyruvate, NAD+, coenzyme A into acetyl-CoA, CO2, and NADH. The conversion is crucial because acetyl-CoA may then be used in the citric acid cycle to carry out cellular respiration. To distinguish between this enzyme and the PDC, it is systematically called pyruvate dehydrogenase (acetyl-transferring). Mechanism The thiamine pyrophosphate (TPP) converts to an ylide by deprotonation. The ylide attack the ketone group of pyruvate. The resulting adduct decarboxylates. The resulting 1,3-dipole reductively acetylates lipoamide-E2. In terms of details, biochem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CoA Biosynthetic Pathway
COA or CoA may refer to: Organizations * Andorran Olympic Committee (Catalan: ''Comitè Olímpic Andorrà'') * Argentine Olympic Committee (Spanish: ''Comité Olímpico Argentino'') * Aruban Olympic Committee (Papiamento: ''Comité Olímpico Arubano'') * Canadian Osteopathic Association, a professional association of osteopathic physicians in Canada * Chicago Options Associates, an American company that specializes in trading options and futures contracts * Clowns of America International, an American organization that represents clowns * Committee of Administrators (CoA), oversaw the reform in 2017 of the Board of Control for Cricket in India * Council of Agriculture, agriculture-related institution in Taiwan * Council of Architecture, an Indian governmental organization that registers architects in the country * Community Oncology Alliance, an American non-profit that advocates for independent, community oncology providers and patients. * Continental Airlines, by ICAO airli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Escherichia Coli
''Escherichia coli'' ( )Wells, J. C. (2000) Longman Pronunciation Dictionary. Harlow ngland Pearson Education Ltd. is a gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus '' Escherichia'' that is commonly found in the lower intestine of warm-blooded organisms. Most ''E. coli'' strains are part of the normal microbiota of the gut, where they constitute about 0.1%, along with other facultative anaerobes. These bacteria are mostly harmless or even beneficial to humans. For example, some strains of ''E. coli'' benefit their hosts by producing vitamin K2 or by preventing the colonization of the intestine by harmful pathogenic bacteria. These mutually beneficial relationships between ''E. coli'' and humans are a type of mutualistic biological relationship—where both the humans and the ''E. coli'' are benefitting each other. ''E. coli'' is expelled into the environment within fecal matter. The bacterium grows massi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pantothenic Acid
Pantothenic acid (vitamin B5) is a B vitamin and an essential nutrient. All animals need pantothenic acid in order to synthesize coenzyme A (CoA), which is essential for cellular energy production and for the synthesis and degradation of proteins, carbohydrates, and fats. Pantothenic acid is the combination of pantoic acid and beta-Alanine, β-alanine. Its name comes from the Greek language, Greek ''pantothen'', meaning "from everywhere", because pantothenic acid, at least in small amounts, is in almost all foods. Deficiency of pantothenic acid is very rare in humans. In dietary supplements and animal feed, the form commonly used is calcium pantothenate, because chemically it is more stable, and hence makes for longer product shelf-life, than sodium pantothenate and free pantothenic acid. Definition Pantothenic acid is a water-soluble vitamin, one of the B vitamins. It is synthesized from the amino acid β-alanine and pantoic acid (see #Biosynthesis, biosynthesis and structu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nathan O
Nathan or Natan may refer to: People and biblical figures *Nathan (given name), including a list of people and characters with this name *Nathan (surname) *Nathan (prophet), a person in the Hebrew Bible *Nathan (son of David), a biblical figure, son of King David and Bathsheba *Nathan of Gaza, a charismatic figure who spread the word of Sabbatai Zevi *Starboy Nathan, a British singer who used the stage name "Nathan" from 2006 to 2011 * Nathan (footballer, born 1994), Brazilian winger Nathan Athaydes Campos Ferreira * Nathan (footballer, born 1995), Brazilian centre back Nathan Raphael Pelae Cardoso *Nathan (footballer, born 1996), Brazilian midfielder Nathan Allan de Souza * Nathan (footballer, born May 1999), Brazilian forward Nathan Crepaldi da Cruz *Nathan (footballer, born August 1999), Brazilian forward Nathan Palafoz de Sousa *Nathan (footballer, born 2001), Brazilian right back Nathan Santos de Araújo * Nathan (footballer, born 2002), Brazilian right back Nathan Gabriel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beverly Guirard
Beverly Marie Guirard was a microbiologist who worked on the biochemistry of microbial growth, especially with respect to vitamin B6. She is also known for her work defining the components of coenzyme A which was a part of the research that led to a Nobel Prize for Fritz Albert Lipmann. Education and career Guirard grew up in Louisiana and went to high school in St. Martinville, Louisiana. Guirard received a B.S. from Southwestern Louisiana Institute in 1936, and a masters degree from Louisiana State University in 1938. She went on to earn a Ph.D. from the University of Texas in 1945 where she worked on lactic acid bacteria and their conversion of acetate into lipids and steroidal material, research which built upon Esmond Emerson Snell's earliest work that identified acetate as a key factor leading to reliable growth of microorganisms. After her Ph.D. she remained at the University of Texas, where she joined Snell's lab in 1951. She moved with the lab to the University of Cali ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Choline
Choline is a cation with the chemical formula . Choline forms various Salt (chemistry), salts, such as choline chloride and choline bitartrate. An essential nutrient for animals, it is a structural component of phospholipids and cell membranes. Choline is used to synthesize acetylcholine, a neurotransmitter involved in muscle control and numerous functions of the nervous system. Choline is involved in early development of the brain, gene expression, cell membrane Signaling peptide receptor, signaling, and brain metabolism. Although humans synthesize choline in the liver, the amount produced naturally is insufficient to meet cellular functions, requiring that some choline be obtained from foods or dietary supplements. Foods rich in choline include meats, poultry, eggs, and other animal-based products, cruciferous vegetables, beans, nuts, and whole grains. Choline is present in breast milk and is commonly added as an food additive, ingredient to baby foods. Chemistry Choline i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Massachusetts General Hospital
Massachusetts General Hospital (Mass General or MGH) is a teaching hospital located in the West End neighborhood of Boston, Massachusetts. It is the original and largest clinical education and research facility of Harvard Medical School/Harvard University, and houses the world's largest hospital-based research program with an annual research budget of more than $1.2 billion in 2021. It is the third-oldest general hospital in the United States with a patient capacity of 999 beds. Along with Brigham and Women's Hospital, Mass General is a founding member of Mass General Brigham, formerly known as Partners HealthCare, the largest healthcare provider in Massachusetts. History Founded in 1811, the original hospital was designed by the famous American architect Charles Bulfinch. It is the third-oldest general hospital in the United States; only Pennsylvania Hospital (1751) and NewYork-Presbyterian Hospital's predecessor New York Hospital (1771) are older. John Warren, Profess ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harvard Medical School
Harvard Medical School (HMS) is the medical school of Harvard University and is located in the Longwood Medical and Academic Area, Longwood Medical Area in Boston, Massachusetts. Founded in 1782, HMS is the third oldest medical school in the United States. It provides patient care, medical education, and research training through its 15 clinical affiliates and research institutes, including Massachusetts General Hospital (MGH), Boston Children's Hospital, Dana–Farber Cancer Institute, Brigham and Women's Hospital, Beth Israel Deaconess Medical Center, Mount Auburn Hospital, McLean Hospital, Cambridge Health Alliance, The Baker Center for Children and Families, Spaulding Rehabilitation Hospital, and others. Harvard Medical School also partners with newer entities such as Harvard Catalyst, Broad Institute , Broad Institute of MIT and Harvard, Harvard Stem Cell Institute, the Center for Primary Care, and Wyss Institute for Biologically Inspired Engineering. History Harvard ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lister Institute
The Lister Institute of Preventive Medicine, informally known as the Lister Institute, was established as a research institute (the British Institute of Preventive Medicine) in 1891, with bacteriologist Marc Armand Ruffer as its first director, using a grant of £250,000 from Edward Cecil Guinness of the Guinness family. It had premises in Chelsea in London, Sudbury in Suffolk, and Elstree in Hertfordshire, England. It was the first medical research charity in the United Kingdom. It was renamed the Jenner Institute (after Edward Jenner, the pioneer of smallpox vaccine) in 1898 and then, in 1903, as the Lister Institute in honour of the great surgeon and medical pioneer, Dr Joseph Lister. In 1905, the institute became a school of the University of London. History The early history of the Lister Institute could best be described as having a chequered history. It began with French chemist and microbiologist Louis Pasteur in 1880 when two rabid dogs were brought to Pasteur fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fritz Lipmann
Fritz Albert Lipmann (; June 12, 1899 – July 24, 1986) was a German-American biochemist and a co-discoverer in 1945 of coenzyme A. For this, together with other research on coenzyme A, he was awarded the Nobel Prize in Physiology or Medicine in 1953 (shared with Hans Adolf Krebs). Early life and education Lipmann was born in Königsberg, Germany, to a Jewish family. His parents were Gertrud (Lachmanski) and Leopold Lipmann, an attorney. Lipmann studied medicine at the University of Königsberg, Berlin, and Munich, graduating in Berlin in 1924. He returned to Königsberg to study chemistry under Professor Hans Meerwein. In 1926 he joined Otto Meyerhof at the Kaiser Wilhelm Institute for Biology, Dahlem, Berlin, for his doctoral thesis. After that he followed Meyerhof to Heidelberg to the Kaiser Wilhelm Institute for Medical Research. Career From 1939 on, Lipmann lived and worked in the United States. He was a Research Associate in the Department of Biochemistry, Cornell Univ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
