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DHPG Biosynthesis Part 2
(''S'')-3,5-Dihydroxyphenylglycine or DHPG is a potent agonist of group I metabotropic glutamate receptors (mGluRs) mGluR1 and mGluR5. DHPG was the first agonist shown to be selective for group I mGluRs. Agonist activity is found in only the (''S'')- isomer, and (''S'')-DHPG may be a partial agonist of group I mGluRs. (''S'')-DHPG has been investigated for therapeutic effects in the treatment of neuronal injury (such as those associated with ischemia or hypoxia), cognitive enhancement, and Alzheimer's disease. 3,5-Dihydroxyphenylglycine can be isolated from the latex of '' Euphorbia helioscopia''. DHGP is also found in vancomycin and related glycopeptides. Although the (S) stereoisomer is synthesized by the DpgA-D enzymes, it is the (R) stereoisomer that is used in vancomycin and other related compounds. DHPG is enzymatically derived from the polyketide Polyketides are a class of natural products derived from a precursor molecule consisting of a chain of alternating keton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agonist
An agonist is a chemical that activates a receptor to produce a biological response. Receptors are cellular proteins whose activation causes the cell to modify what it is currently doing. In contrast, an antagonist blocks the action of the agonist, while an inverse agonist causes an action opposite to that of the agonist. Etymology From the Greek αγωνιστής (agōnistēs), contestant; champion; rival < αγων (agōn), contest, combat; exertion, struggle < αγω (agō), I lead, lead towards, conduct; drive Types of agonists can be activated by either endogenous agonists (such as |
Polyketide
Polyketides are a class of natural products derived from a precursor molecule consisting of a chain of alternating ketone (or reduced forms of a ketone) and methylene groups: (-CO-CH2-). First studied in the early 20th century, discovery, biosynthesis, and application of polyketides has evolved. It is a large and diverse group of secondary metabolites caused by its complex biosynthesis which resembles that of fatty acid synthesis. Because of this diversity, polyketides can have various medicinal, agricultural, and industrial applications. Many polyketides are medicinal or exhibit acute toxicity. Biotechnology has enabled discovery of more naturally-occurring polyketides and evolution of new polyketides with novel or improved bioactivity. History Naturally produced polyketides by various plants and organisms have been used by humans since before studies on them began in the 19th and 20th century. In 1893, J. Norman Collie synthesized detectable amounts of orcinol by heating dehy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resorcinols
Resorcinol (or resorcin) is an organic compound with the formula C6H4(OH)2. It is one of three isomeric benzenediols, the 1,3-isomer (or ''meta''-isomer). Resorcinol crystallizes from benzene as colorless needles that are readily soluble in water, alcohol, and ether, but insoluble in chloroform and carbon disulfide. Production Resorcinol is produced in several steps from benzene, starting with dialkylation with propylene to give 1,3-diisopropylbenzene. Oxidation and Hock rearrangement of this disubstituted arene gives acetone and resorcinol. Resorcinol is an expensive chemical, produced in only a very few locations around the world (to date only four commercial plants are known to be operative: in the United States, Germany,China and Japan), and as such it is the determining factor in the cost of PRF adhesives. Many additional routes exist for resorcinol. It was formerly produced by disulfonation of benzene followed by hydrolysis of the 1,3-disulfonate. This method has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nootropics
Nootropics ( , or ) (colloquial: smart drugs and cognitive enhancers, similar to adaptogens) are a wide range of natural or synthetic supplements or drugs and other substances that are claimed to improve cognitive function or to promote relaxation, particularly boosting mood, executive functions, attention, memory, creativity, or motivation in healthy individuals. The use of cognition-enhancing supplements by healthy individuals in the absence of a medical indication spans numerous controversial issues, including the ethics and fairness of their use, concerns over adverse effects, and the diversion of prescription drugs for non-medical uses. Nonetheless, the international sales of cognitive- or mood-enhancing supplements have continued to grow over time and in 2012 reached 0.69 billion. With sales supported by global health trends, the market is expected to reach US$33.85 billion by the year 2030, at a CAGR of 14.8%. While most nootropics are not regulated, there are othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amino Acid Derivatives
In chemistry, amines (, ) are compounds and functional groups that contain a basic nitrogen atom with a lone pair. Amines are formally derivatives of ammonia (), wherein one or more hydrogen atoms have been replaced by a substituent such as an alkyl or aryl group (these may respectively be called alkylamines and arylamines; amines in which both types of substituent are attached to one nitrogen atom may be called alkylarylamines). Important amines include amino acids, biogenic amines, trimethylamine, and aniline; Inorganic derivatives of ammonia are also called amines, such as monochloramine (). The substituent is called an amino group. Compounds with a nitrogen atom attached to a carbonyl group, thus having the structure , are called amides and have different chemical properties from amines. Classification of amines Amines can be classified according to the nature and number of substituents on nitrogen. Aliphatic amines contain only H and alkyl substituents. Aromatic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nonribosomal Peptide
Nonribosomal peptides (NRP) are a class of peptide secondary metabolites, usually produced by microorganisms like bacteria and fungi. Nonribosomal peptides are also found in higher organisms, such as nudibranchs, but are thought to be made by bacteria inside these organisms. While there exist a wide range of peptides that are not synthesized by ribosomes, the term ''nonribosomal peptide'' typically refers to a very specific set of these as discussed in this article. Nonribosomal peptides are synthesized by nonribosomal peptide synthetases, which, unlike the ribosomes, are independent of messenger RNA. Each nonribosomal peptide synthetase can synthesize only one type of peptide. Nonribosomal peptides often have cyclic and/or branched structures, can contain non-proteinogenic amino acids including D-amino acids, carry modifications like '' N''-methyl and ''N''-formyl groups, or are glycosylated, acylated, halogenated, or hydroxylated. Cyclization of amino acids against the peptide " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DHPG Biosynthesis Part 3
(''S'')-3,5-Dihydroxyphenylglycine or DHPG is a potent agonist of group I metabotropic glutamate receptors (mGluRs) mGluR1 and mGluR5. DHPG was the first agonist shown to be selective for group I mGluRs. Agonist activity is found in only the (''S'')- isomer, and (''S'')-DHPG may be a partial agonist of group I mGluRs. (''S'')-DHPG has been investigated for therapeutic effects in the treatment of neuronal injury (such as those associated with ischemia or hypoxia), cognitive enhancement, and Alzheimer's disease. 3,5-Dihydroxyphenylglycine can be isolated from the latex of '' Euphorbia helioscopia''. DHGP is also found in vancomycin and related glycopeptides. Although the (S) stereoisomer is synthesized by the DpgA-D enzymes, it is the (R) stereoisomer that is used in vancomycin and other related compounds. DHPG is enzymatically derived from the polyketide Polyketides are a class of natural products derived from a precursor molecule consisting of a chain of alternating keton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DHPG Biosynthesis Part 2
(''S'')-3,5-Dihydroxyphenylglycine or DHPG is a potent agonist of group I metabotropic glutamate receptors (mGluRs) mGluR1 and mGluR5. DHPG was the first agonist shown to be selective for group I mGluRs. Agonist activity is found in only the (''S'')- isomer, and (''S'')-DHPG may be a partial agonist of group I mGluRs. (''S'')-DHPG has been investigated for therapeutic effects in the treatment of neuronal injury (such as those associated with ischemia or hypoxia), cognitive enhancement, and Alzheimer's disease. 3,5-Dihydroxyphenylglycine can be isolated from the latex of '' Euphorbia helioscopia''. DHGP is also found in vancomycin and related glycopeptides. Although the (S) stereoisomer is synthesized by the DpgA-D enzymes, it is the (R) stereoisomer that is used in vancomycin and other related compounds. DHPG is enzymatically derived from the polyketide Polyketides are a class of natural products derived from a precursor molecule consisting of a chain of alternating keton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DHPG Biosynthesis Part 1
(''S'')-3,5-Dihydroxyphenylglycine or DHPG is a potent agonist of group I metabotropic glutamate receptors (mGluRs) mGluR1 and mGluR5. DHPG was the first agonist shown to be selective for group I mGluRs. Agonist activity is found in only the (''S'')- isomer, and (''S'')-DHPG may be a partial agonist of group I mGluRs. (''S'')-DHPG has been investigated for therapeutic effects in the treatment of neuronal injury (such as those associated with ischemia or hypoxia), cognitive enhancement, and Alzheimer's disease. 3,5-Dihydroxyphenylglycine can be isolated from the latex of '' Euphorbia helioscopia''. DHGP is also found in vancomycin and related glycopeptides. Although the (S) stereoisomer is synthesized by the DpgA-D enzymes, it is the (R) stereoisomer that is used in vancomycin and other related compounds. DHPG is enzymatically derived from the polyketide Polyketides are a class of natural products derived from a precursor molecule consisting of a chain of alternating keton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malonyl-CoA
Malonyl-CoA is a coenzyme A derivative of malonic acid. Functions It plays a key role in chain elongation in fatty acid biosynthesis and polyketide biosynthesis. Fatty acid biosynthesis Malonyl-CoA provides 2-carbon units to fatty acids and commits them to fatty acid chain synthesis. Malonyl-CoA is formed by carboxylating acetyl-CoA using the enzyme acetyl-CoA carboxylase. One molecule of acetyl-CoA joins with a molecule of bicarbonate,Nelson D, Cox M (2008) ''Lehninger principles of biochemistry''. 5th Ed: p. 806 requiring energy rendered from ATP. Malonyl-CoA is utilised in fatty acid biosynthesis by the enzyme malonyl coenzyme A:acyl carrier protein transacylase (MCAT). MCAT serves to transfer malonate from malonyl-CoA to the terminal thiol of ''holo''-acyl carrier protein (ACP). Polyketide biosynthesis MCAT is also involved in bacterial polyketide biosynthesis. The enzyme MCAT together with an acyl carrier protein (ACP), and a polyketide synthase (PKS) and chain-length f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acetyl-CoA
Acetyl-CoA (acetyl coenzyme A) is a molecule that participates in many biochemical reactions in protein, carbohydrate and lipid metabolism. Its main function is to deliver the acetyl group to the citric acid cycle (Krebs cycle) to be oxidized for energy production. Coenzyme A (CoASH or CoA) consists of a β-mercaptoethylamine group linked to the vitamin pantothenic acid (B5) through an amide linkage and 3'-phosphorylated ADP. The acetyl group (indicated in blue in the structural diagram on the right) of acetyl-CoA is linked to the sulfhydryl substituent of the β-mercaptoethylamine group. This thioester linkage is a "high energy" bond, which is particularly reactive. Hydrolysis of the thioester bond is exergonic (−31.5 kJ/mol). CoA is acetylated to acetyl-CoA by the breakdown of carbohydrates through glycolysis and by the breakdown of fatty acids through β-oxidation. Acetyl-CoA then enters the citric acid cycle, where the acetyl group is oxidized to carbon dioxide and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
