Category: Pyrazines

Product Details of 2150-55-2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid, is researched, Molecular C4H6N2O2S, CAS is 2150-55-2, about Genes from Pseudomonas sp. strain BS involved in the conversion of L-2-amino-Δ2-thiazolin-4-carbonic acid to L-cysteine. Author is Shiba, Toshikazu; Takeda, Kohji; Yajima, Misako; Tadano, Makoto.

DL-2-Amino-Δ2-thiazoline-4-carbonic acid (DL-ATC) is a substrate for cysteine synthesis in some bacteria, and this bioconversion has been utilized for cysteine production in industry. We cloned a DNA fragment containing the genes involved in the conversion of L-ATC to L-cysteine from Pseudomonas sp. strain BS. The introduction of this DNA fragment into Escherichia coli cells enabled them to convert L-ATC to cysteine via N-carbamoyl-L-cysteine (L-NCC) as an intermediate. The smallest recombinant plasmid, designated pTK10, contained a 2.6-kb insert DNA fragment that has L-cysteine synthetic activity. The nucleotide sequence of the insert DNA revealed that two open reading frames (ORFs) encoding proteins with mol. masses of 19.5 and 44.7 kDa were involved in the L-cysteine synthesis from DL-ATC. These ORFs were designated atcB and atcC, resp., and their gene products were identified by overproduction of proteins encoded in each ORF and by the maxicell method. The functions of these gene products were examined using extracts of E. coli cells carrying deletion derivatives of pTK10. The results indicate that atcB and atcC are involved in the conversion of L-ATC to L-NCC and the conversion of L-NCC to cysteine, resp. AtcB was first identified as a gene encoding an enzyme that catalyzes thiazoline ring opening. AtcC is highly homologous with L-N-carbamoylases. Since both enzymes can only catalyze the L-specific conversion from L-ATC to L-NCC or L-NCC to L-cysteine, it is thought that atcB and atcC encode L-ATC hydrolase and N-carbamoyl-L-cysteine amidohydrolase, resp.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Formula: C6H5ClN2O. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 3-Chloropicolinamide, is researched, Molecular C6H5ClN2O, CAS is 114080-95-4, about The addition of hydroxylamine to derivatives of halopyridine carboxylic acids. Author is Dunn, A. D..

Cyanopyridines I (R = Cl, R1 = cyano, R2 = H; R = cyano, R1 = Cl, R2 = H; R = H, R1 = cyano, R2 = Cl) reacted with a MeOH solution of NH2OH and MeONa to give isoxazolopyridines. Thus, I (R = Cl, R1 = cyano, R2 = H) gave isoxazolopyridine II. However, I (R = H, R1 = Cl, R2 = cyano) reacted with the same reagent to give I (R, R1, same, R2 = CONH2), and I (R = H, R1 = Br, R2 = cyano) gave I [R, R1, same, R2 = C(:NOH)NH2]. No bicyclic products were formed . Esters I (R = Cl, R1 = CO2Me, R2 = H) reacted with the same reagent to give the hydroxamic acids I (R, R2, same, R1 = CONHOH). Similarly esters I (R = CO2Me, R1 = Br, R2 = H; R= H, R1 = Br, R2 = CO2Me) also gave the corresponding hydroxamic acids.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid(SMILESS: O=C(C1N=C(N)SC1)O,cas:2150-55-2) is researched.Category: thiazole. The article 《Microbial conversion mechanism of D,L-2-amino-Δ2-thiazoline-4-carboxylic acid to L-cysteine in Pseudomonas species and its application》 in relation to this compound, is published in Current Topics in Biotechnology. Let’s take a look at the latest research on this compound (cas:2150-55-2).

A review. L-Cysteine which is widely used in food additives, nutritional infusions, and cosmetics and medicines has mainly been produced from hydrolyzates of hair by acid or alkali. As an alternative to this traditional method, a new microbial conversion method for L-cysteine production from a chem. synthesized precursor, D,L-2-amino-Δ2-thiazoline-4-carboxylic acid (D,L-ATC), using Pseudomonas species was developed. From the studies on the microbial conversion process of D,L-ATC to L-cysteine in several Pseudomonas strains by several groups, it was found that there are two pathways via S-carbamoyl-L-cysteine (L-SCC, pathway 1) and via N-carbamoyl-L-cysteine (L-NCC, pathway 2) in the microbial conversion process. We isolated and identified the genes for ATC hydrolase and NCC amidohydrolase, which are involved in pathway 2 in Pseudomonas sp. ON-4a. The ATC hydrolase and NCC amidohydrolase expressed in Escherichia coli were purified and characterized. In this study, we clarified the mol. basis of the microbial conversion of D,L-ATC to L-cysteine. We propose that L-cysteine production from D,L-ATC can be effectively carried out by two continuous reactions using recombinant ATC hydrolase and NCC amidohydrolase.

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Pyrazine – Wikipedia,
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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Discovery of a novel alpha-7 nicotinic acetylcholine receptor agonist series and characterization of the potent, selective, and orally efficacious agonist 5-(4-Acetyl[1,4]diazepan-1-yl)pentanoic acid [5-(4-Methoxyphenyl)-1H-pyrazol-3-yl] amide (SEN15924, WAY-361789), published in 2012-05-24, which mentions a compound: 91912-53-7, Name is 3-(Pyridin-4-yl)-1H-pyrazol-5-amine, Molecular C8H8N4, Application In Synthesis of 3-(Pyridin-4-yl)-1H-pyrazol-5-amine.

Alpha-7 nicotinic acetylcholine receptors (α7 nAChR) are implicated in the modulation of many cognitive functions such as attention, working memory, and episodic memory. For this reason, α7 nAChR agonists represent promising therapeutic candidates for the treatment of cognitive impairment associated with Alzheimer’s disease (AD) and schizophrenia. A medicinal chem. effort, around our previously reported chem. series, permitted the discovery of a novel class of α7 nAChR agonists with improved selectivity, in particular against the α3 receptor subtype and better ADME profile. The exploration of this series led to the identification of 5-(4-acetyl[1,4]diazepan-1-yl)pentanoic acid [5-(4-methoxyphenyl)-1H-pyrazol-3-yl] amide [(I), SEN15924, WAY-361789], a novel, full agonist of the α7 nAChR that was evaluated in vitro and in vivo. Compound I proved to be potent and selective, and it demonstrated a fair pharmacokinetic profile accompanied by efficacy in rodent behavioral cognition models (novel object recognition and auditory sensory gating).

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 5-Amino-2-fluoropyridine( cas:1827-27-6 ) is researched.Recommanded Product: 1827-27-6.Wu, Jing-wei; Yin, Ling; Liu, Yu-qiang; Zhang, Huan; Xie, Ya-fei; Wang, Run-ling; Zhao, Gui-long published the article 《Synthesis, biological evaluation and 3D-QSAR studies of 1,2,4-triazole-5-substituted carboxylic acid bioisosteres as uric acid transporter 1 (URAT1) inhibitors for the treatment of hyperuricemia associated with gout》 about this compound( cas:1827-27-6 ) in Bioorganic & Medicinal Chemistry Letters. Keywords: bromonaphthylmethyltriazolyl thioether preparation URAT1 inhibitor; structure bromonaphthylmethyltriazolyl thioether inhibition uric acid transporter; pharmacophore determination bromonaphthylmethyltriazolyl thioether URAT1 inhibition QSAR; 3D-QSAR; Bioisosteres; Biological evaluation; Gout; Synthesis. Let’s learn more about this compound (cas:1827-27-6).

Bromonaphthylmethyltriazolyl thioether lesinurad analogs and bioisosteres such as I were prepared as inhibitors of uric acid transporter 1 (URAT1) for potential use in treating hyperuricemia and gout. I inhibited URAT1 with an IC50 value of 32 nM, 225-fold lower than lesinurad. The pharmacophore for the lesinurad analogs was determined using a 3D-QSAR pharmacophore model; the hypothesis was validated by three methods (cost anal., Fisher’s randomization and leave-one-out).

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Computed Properties of C4H6N2O2S. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid, is researched, Molecular C4H6N2O2S, CAS is 2150-55-2, about Microbial enzyme conversion of L-cysteine and L-cystine. Author is Liu, Zhong; Yang, Wenbo; Bai, Gang; Tian, Wang; Jin, Yongjie.

Pseudomonas sp. TS1138 isolated from soil samples was able to form L-cysteine from DL-2-Amiuo-δ2-Thiazoline-4-Carboxylic Acid (DL-ATC) after cultured 16 h. The optimum carbon and nitrogen sources of strain growth and enzyme formation are glucose and urea. This enzyme was induced by DL-ATC. The product was identified to be L-Cysteine based on thin layer chromatog., optical rotation and HPLC studies.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Ohmachi, Tetsuo; Nishino, Mizuka; Kawata, Maki; Edo, Namiko; Funaki, Hiroko; Narita, Megumi; Mori, Kazuyuki; Tamura, Yoshiharu; Asada, Yoshihiro published an article about the compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid( cas:2150-55-2,SMILESS:O=C(C1N=C(N)SC1)O ).Product Details of 2150-55-2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:2150-55-2) through the article.

The newly isolated strain Pseudomonas sp. ON-4a converts D,L-2-amino-Δ2-thiazoline-4-carboxylic acid (D,L-ATC) to L-cysteine via N-carbamoyl-L-cysteine. A genomic DNA fragment from this strain containing the gene(s) encoding enzymes that convert D,L-ATC into L-cysteine was cloned in Escherichia coli. Transformants expressing cysteine-forming activity were selected by growth of an E. coli mutant defective in the cysB gene. A pos. clone, denoted CM1, carrying the plasmid pCM1 with an insert DNA of approx. 3.4 kb was obtained, and the nucleotide sequence of a complementing region was analyzed. Anal. of the sequence found two open reading frames, ORF1 and ORF2, which encoded proteins of 183 and 435 amino acid residues, resp. E. coli DH5α harboring pTrCM1, which was constructed by inserting the subcloned sequence into an expression vector, expressed two proteins of 25 kDa and 45 kDa. From the analyses of crude extracts of E. coli DH5α carrying deletion derivatives of pTrCM1 by sodium dodecyl sulfatepolyacrylamide gel electrophoresis and by enzymic activity, it was found that the 25-kDa protein encoded by ORF1 was the enzyme L-2-amino-Δ2-thiazoline-4-carboxylic acid hydrolase, which catalyzes the conversion of D,L-ATC to N-carbamoyl-L-cysteine, and that the 45-kDa protein encoded by ORF2 was the enzyme N-carbamoyl-L-cysteine amidohydrolase, which catalyzes the conversion of N-carbamoyl-L-cysteine to L-cysteine.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Huai, Lihua; Chen, Ning researched the compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid( cas:2150-55-2 ).Name: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid.They published the article 《Effect of dissolved oxygen on production of L-cysteine synthetase by Pseudomonas sp. TS1138》 about this compound( cas:2150-55-2 ) in Shipin Kexue (Beijing, China). Keywords: dissolved oxygen cysteine synthetase Pseudomonas fermentation. We’ll tell you more about this compound (cas:2150-55-2).

Pseudomonas sp. TS1138 has potential to produce L-cysteine synthetase through asym. hydrolysis of DL-2-amino-Δ2-thiazoline-4-carboxylic acid (DL-ATC). The effect of dissolved oxygen level on the production of L-cysteine synthetase was investigated in shake flasks or 7 L bioreactor. The results indicated that the cell growth and the production of L-cysteine synthetase were inhibited at low dissolved oxygen level. Although cell growth was improved at the high dissolved oxygen level, the inhibition against production of L-cysteine synthetase was still observed in shake flasks. In 7 L bioreactor, dissolved oxygen concentration controlled at more than 30% was helpful for improving the cell growth and the production of L-cysteine synthetase through regulating agitation rate and air flow rate during the middle and late stage.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Novel pyrazolopyrimidines as highly potent B-Raf inhibitors》. Authors are Di Grandi, Martin J.; Berger, Dan M.; Hopper, Darrin W.; Zhang, Chunchun; Dutia, Minu; Dunnick, Alejandro L.; Torres, Nancy; Levin, Jeremy I.; Diamantidis, George; Zapf, Christoph W.; Bloom, Jonathan D.; Hu, YongBo; Powell, Dennis; Wojciechowicz, Donald; Collins, Karen; Frommer, Eileen.The article about the compound:3-(Pyridin-4-yl)-1H-pyrazol-5-aminecas:91912-53-7,SMILESS:NC1=CC(C2=CC=NC=C2)=NN1).Product Details of 91912-53-7. Through the article, more information about this compound (cas:91912-53-7) is conveyed.

A novel series of pyrazolo[1,5-a]pyrimidines bearing a 3-hydroxyphenyl group at C(3) and substituted tropanes at C(7) have been identified as potent B-Raf inhibitors. Exploration of alternative functional groups as a replacement for the C(3) phenol demonstrated indazole to be an effective isostere. Several compounds possessing substituted indazole residues, such as 4e, 4p, and 4r, potently inhibited cell proliferation at submicromolar concentrations in the A375 and WM266 cell lines, and the latter two compounds also exhibited good therapeutic indexes in cells.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Category: pyrazines. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid, is researched, Molecular C4H6N2O2S, CAS is 2150-55-2, about The stability of L-ATC hydrolase participating in L-cysteine production.

In the production of L-cysteine from DL-2-amino-Δ2-thiazoline-4-carboxylic acid (DL-ATC), the stability of the relevant enzymes produced by Pseudomonas sp. was tested, and strategies to improve the stability of L-ATC hydrolase were investigated with respect to water activity and ionic strength. Among the 3 enzymes which participate in L-cysteine production, i.e., ATC racemase, L-ATC hydrolase, and S-carbamyl-L-cysteine hydrolase, L-ATC hydrolase is the least stable. Various mixtures of salts and sorbitol were added to adjust the water activities of the tested solutions As the water activity decreased from 0.93 to 0.80, the stability of L-ATC hydrolase was sharply enhanced. In the absence of sorbitol, the stability of L-ATC hydrolase increased in proportion to ionic strength. Even though enzyme stability was not good at a low ionic strength, it was enhanced by lowering the water activity with the addition of sorbitol. The half-life of L-ATC hydrolase in sorbitol-salt mixtures increased by 10- to 20-fold compared to that of a control.

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Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem