Clinical data | |
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Trade names | Seromycin |
Other names | D-cycloserine, 4-amino-3-isoxazolidinone |
AHFS/Drugs.com | Monograph |
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Pharmacokinetic data | |
Bioavailability | ~70% to 90% |
Metabolism | Liver |
Elimination half-life | 10 hrs (normal kidney function) |
Excretion | Kidney |
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ECHA InfoCard | 100.000.626 |
Chemical and physical data | |
Formula | C3H6N2O2 |
Molar mass | 102.093 g·mol−1 |
3D model (JSmol) | |
Melting point | 155 to 156 °C (311 to 313 °F) (dec.) |
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Cycloserine, sold under the brand name Seromycin, is a GABA transaminase inhibitor and an antibiotic, used to treat tuberculosis. [1] [2] Specifically it is used, along with other antituberculosis medications, for active drug resistant tuberculosis. [2] It is given by mouth. [2]
Common side effects include allergic reactions, seizures, sleepiness, unsteadiness, and numbness. [2] It is not recommended in people who have kidney failure, epilepsy, depression, or are alcoholics. [2] It is unclear if use during pregnancy is safe for the baby. [2] Cycloserine is similar in structure to the amino acid D-alanine and works by interfering with the formation of the bacteria's cell wall. [2]
Cycloserine was discovered in 1954 from a type of Streptomyces . [3] It is on the World Health Organization's List of Essential Medicines. [4]
For the treatment of tuberculosis, cycloserine is classified as a second-line drug. Its use is only considered if one or more first-line drugs cannot be used. Hence, cycloserine is restricted for use only against multiple drug-resistant and extensively drug-resistant strains of M. tuberculosis. Another reason for limited use of this drug is the neurological side effects it causes, since it is able to penetrate into the central nervous system (CNS) and cause headaches, drowsiness, depression, dizziness, vertigo, confusion, paresthesias, dysarthria, hyperirritability, psychosis, convulsions, and shaking (tremors). [5] [6] Overdose of cycloserine may result in paresis, seizures, and coma, while alcohol consumption may increase the risk of seizures. [6] Coadministration of pyridoxine can reduce the incidence of some of these CNS side effects (e.g. convulsions) caused by cycloserine.[ citation needed ]
A 2015 Cochrane review found no evidence of benefit in anxiety disorders as of 2015. [7] Another review found preliminary evidence of benefit. [8] Evidence for use in addiction is tentative but also unclear. [9]
Cycloserine works as an antibiotic by inhibiting cell-wall biosynthesis in bacteria. [10] [11] As a cyclic analogue of D-alanine, cycloserine acts against two crucial enzymes important in the cytosolic stages of peptidoglycan synthesis: alanine racemase (Alr) and D-alanine:D-alanine ligase (Ddl). [11] The first enzyme is a pyridoxal 5'-phosphate-dependent enzyme which converts the L-alanine to the D-alanine form. [11] The second enzyme is involved in joining two of these D-alanine residues together by catalyzing the formation of the ATP-dependent D-alanine-D-alanine dipeptide bond between the resulting D-alanine molecules. [11] If both of these enzymes are inhibited, then D-alanine residues cannot form and previously formed D-alanine molecules cannot be joined. [11] This effectively leads to inhibition of peptidoglycan synthesis. [11]
Psychiatric use is suggested based on partial NMDA receptor agonism, which improves neural plasticity in lab animals. The degree of clinical usefulness is, as aforementioned, unclear and still being explored, as of 2016. [8]
Under mildly acidic conditions, cycloserine hydrolyzes to give hydroxylamine and D-serine. [12] [13] Cycloserine can be conceptualized as a cyclized version of serine, with an oxidative loss of dihydrogen to form the nitrogen-oxygen bond.[ citation needed ]
Cycloserine is stable under basic conditions, with the greatest stability at pH = 11.5. [12]
Initial approaches to synthesize the compound was first published in 1955, when the Stammer group produced a racemic synthesis from DL‐β‐aminoxyalanine ethyl ester. In 1957, Platter et al. managed to synthesis the pure D-enantiomer by cyclizing the corresponding α‐amino‐β‐chlorohydroxamic acids. Chemical synthesis of the compound was revolutionized in the 2010s, when several approaches starting with the cheap D-serine (mirror form of normal L-serine) were published by different groups. [14]
The biosynthesis of the compound is defined by a ten-gene cluster. L-serine and L-arginine are converted to O-ureido-L-serine, flipped to O-ureido-D-serine, then turned into the final compound by cyclization. In 2013, Uda et al. successfully used recombinant versions of three enzymes in the cluster to produce the compound. [15]
A 1963 patent describes industrial production of the drug by bacterial fermentation. [16] It is unclear what process is used in the 21st century, fermentation, or chemical synthesis.[ citation needed ]
The compound was first isolated nearly simultaneously by two teams. Workers at Merck isolated the compound, which they called oxamycin, from a species of Streptomyces. [17] The same team prepared the molecule synthetically. [18] Workers at Eli Lilly isolated the compound from strains of Streptomyces orchidaceus. It was shown to hydrolyze to serine and hydroxylamine. [19]
In the U.S., the price of cycloserine increased from $500 for 30 pills to $10,800 in 2015 after the Chao Center for Industrial Pharmacy and Contract Manufacturing changed ownership to Rodelis Therapeutics in August 2015. [20]
The price increase was rescinded after the previous owner, the Purdue University Research Foundation, which retained "oversight of the manufacturing operation" intervened and Rodelis returned the drug to an NGO of Purdue University. The foundation now will charge $1,050 for 30 capsules, twice what it charged before". Eli Lilly has been criticised for not ensuring that the philanthropic initiative continued. Due to US antitrust laws, however, no company may control the price of a product after it is outlicensed. [21]
In 2015, the cost in the United States was increased to US$3,150 a month and then decreased to US$1,050 per month. [21]
Reviews in 2016-17 found that cycloserine produced a small improvement in cognitive behavioral therapy for anxiety, obsessive-compulsive disorder, and post-traumatic stress disorder, [22] and had potential for use as a therapy in psychiatric diseases. [8]
A β-lactam (beta-lactam) ring is a four-membered lactam. A lactam is a cyclic amide, and beta-lactams are named so because the nitrogen atom is attached to the β-carbon atom relative to the carbonyl. The simplest β-lactam possible is 2-azetidinone. β-lactams are significant structural units of medicines as manifested in many β-lactam antibiotics. Up to 1970, most β-lactam research was concerned with the penicillin and cephalosporin groups, but since then, a wide variety of structures have been described.
Serine is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group, a carboxyl group, and a side chain consisting of a hydroxymethyl group, classifying it as a polar amino acid. It can be synthesized in the human body under normal physiological circumstances, making it a nonessential amino acid. It is encoded by the codons UCU, UCC, UCA, UCG, AGU and AGC.
Vancomycin is a glycopeptide antibiotic medication used to treat certain bacterial infections. It is administered intravenously to treat complicated skin infections, bloodstream infections, endocarditis, bone and joint infections, and meningitis caused by methicillin-resistant Staphylococcus aureus. Blood levels may be measured to determine the correct dose. Vancomycin is also taken orally to treat Clostridioides difficile infections. When taken orally, it is poorly absorbed.
Phenelzine, sold under the brand name Nardil among others, is a non-selective and irreversible monoamine oxidase inhibitor (MAOI) of the hydrazine family which is primarily used as an antidepressant and anxiolytic to treat depression and anxiety. Along with tranylcypromine and isocarboxazid, phenelzine is one of the few non-selective and irreversible MAOIs still in widespread clinical use.
Dehydroalanine is a dehydroamino acid. It does not exist in its free form, but it occurs naturally as a residue found in peptides of microbial origin. As an amino acid residue, it is unusual because it has an unsaturated backbone.
Rifampicin, also known as rifampin, is an ansamycin antibiotic used to treat several types of bacterial infections, including tuberculosis (TB), Mycobacterium avium complex, leprosy, and Legionnaires' disease. It is almost always used together with other antibiotics with two notable exceptions: when given as a "preferred treatment that is strongly recommended" for latent TB infection; and when used as post-exposure prophylaxis to prevent Haemophilus influenzae type b and meningococcal disease in people who have been exposed to those bacteria. Before treating a person for a long period of time, measurements of liver enzymes and blood counts are recommended. Rifampicin may be given either by mouth or intravenously.
Ceftriaxone, sold under the brand name Rocephin, is a third-generation cephalosporin antibiotic used for the treatment of a number of bacterial infections. These include middle ear infections, endocarditis, meningitis, pneumonia, bone and joint infections, intra-abdominal infections, skin infections, urinary tract infections, gonorrhea, and pelvic inflammatory disease. It is also sometimes used before surgery and following a bite wound to try to prevent infection. Ceftriaxone can be given by injection into a vein or into a muscle.
DD-Transpeptidase is a bacterial enzyme that catalyzes the transfer of the R-L-αα-D-alanyl moiety of R-L-αα-D-alanyl-D-alanine carbonyl donors to the γ-OH of their active-site serine and from this to a final acceptor. It is involved in bacterial cell wall biosynthesis, namely, the transpeptidation that crosslinks the peptide side chains of peptidoglycan strands.
Biosynthesis, i.e., chemical synthesis occurring in biological contexts, is a term most often referring to multi-step, enzyme-catalyzed processes where chemical substances absorbed as nutrients serve as enzyme substrates, with conversion by the living organism either into simpler or more complex products. Examples of biosynthetic pathways include those for the production of amino acids, lipid membrane components, and nucleotides, but also for the production of all classes of biological macromolecules, and of acetyl-coenzyme A, adenosine triphosphate, nicotinamide adenine dinucleotide and other key intermediate and transactional molecules needed for metabolism. Thus, in biosynthesis, any of an array of compounds, from simple to complex, are converted into other compounds, and so it includes both the catabolism and anabolism of complex molecules. Biosynthetic processes are often represented via charts of metabolic pathways. A particular biosynthetic pathway may be located within a single cellular organelle, while others involve enzymes that are located across an array of cellular organelles and structures.
Clavulanic acid is a β-lactam drug that functions as a mechanism-based β-lactamase inhibitor. While not effective by itself as an antibiotic, when combined with penicillin-group antibiotics, it can overcome antibiotic resistance in bacteria that secrete β-lactamase, which otherwise inactivates most penicillins.
Kanamycin A, often referred to simply as kanamycin, is an antibiotic used to treat severe bacterial infections and tuberculosis. It is not a first line treatment. It is used by mouth, injection into a vein, or injection into a muscle. Kanamycin is recommended for short-term use only, usually from 7 to 10 days. Since antibiotics only show activity against bacteria, it is ineffective in viral infections.
The mitomycins are a family of aziridine-containing natural products isolated from Streptomyces caespitosus or Streptomyces lavendulae. They include mitomycin A, mitomycin B, and mitomycin C. When the name mitomycin occurs alone, it usually refers to mitomycin C, its international nonproprietary name. Mitomycin C is used as a medicine for treating various disorders associated with the growth and spread of cells.
Penicillin-binding proteins (PBPs) are a group of proteins that are characterized by their affinity for and binding of penicillin. They are a normal constituent of many bacteria; the name just reflects the way by which the protein was discovered. All β-lactam antibiotics bind to PBPs, which are essential for bacterial cell wall synthesis. PBPs are members of a subgroup of transpeptidase enzymes called DD-transpeptidases.
Tyrocidine is a mixture of cyclic decapeptides produced by the bacteria Brevibacillus brevis found in soil. It can be composed of 4 different amino acid sequences, giving tyrocidine A–D. Tyrocidine is the major constituent of tyrothricin, which also contains gramicidin. Tyrocidine was the first commercially available antibiotic, but has been found to be toxic toward human blood and reproductive cells. The function of tyrocidine within its host B. brevis is thought to be regulation of sporulation.
D-amino acid oxidase is an enzyme with the function on a molecular level to oxidize D-amino acids to the corresponding α-keto acids, producing ammonia and hydrogen peroxide. This results in a number of physiological effects in various systems, most notably the brain. The enzyme is most active toward neutral D-amino acids, and not active toward acidic D-amino acids. One of its most important targets in mammals is D-Serine in the central nervous system. By targeting this and other D-amino acids in vertebrates, DAAO is important in detoxification. The role in microorganisms is slightly different, breaking down D-amino acids to generate energy.
D-amino-acid dehydrogenase is a bacterial enzyme that catalyses the oxidation of D-amino acids into their corresponding oxoacids. It contains both flavin and nonheme iron as cofactors. The enzyme has a very broad specificity and can act on most D-amino acids.
In enzymology, an alanine racemase is an enzyme that catalyzes the chemical reaction
In enzymology, a D-alanine—D-alanine ligase is an enzyme that catalyzes the chemical reaction
Sparsomycin is a compound, initially discovered as a metabolite of the bacterium Streptomyces sparsogenes, which binds to the 50S ribosomal subunit and inhibits protein synthesis through peptidyl transferase inhibition. As it binds to the 50S ribosomal subunit, it induces translocation on the 30S subunit. It is a nucleotide analogue. It was also formerly thought to be a possible anti-tumor agent, but interest in this drug was later discarded after it was discovered that it resulted in retinopathy and as a tool to study protein synthesis; it is not specific for bacterial ribosomes and so not usable as an antibiotic.
Cephalosporins are a broad class of bactericidal antibiotics that include the β-lactam ring and share a structural similarity and mechanism of action with other β-lactam antibiotics. The cephalosporins have the ability to kill bacteria by inhibiting essential steps in the bacterial cell wall synthesis which in the end results in osmotic lysis and death of the bacterial cell. Cephalosporins are widely used antibiotics because of their clinical efficiency and desirable safety profile.