- Androsamide, a Cyclic Tetrapeptide from a Marine Nocardiopsis sp., Suppresses Motility of Colorectal Cancer Cells
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A cyclic tetrapeptide, androsamide (1), was isolated from a marine actinomycete of the genus Nocardiopsis, strain CNT-189. The planar structure of 1 was assigned by the interpretation of 1D and 2D NMR spectroscopic data. The absolute configurations of constituent amino acids of 1 were determined by application of the Marfey's and advanced Marfey's methods. Androsamide (1) strongly suppressed the motility of Caco2 cells caused by epithelial-mesenchymal transition.
- Lee, Jihye,Gamage, Chathurika. D. B.,Kim, Geum Jin,Hillman, Prima F.,Lee, Chaeyoung,Lee, Eun Young,Choi, Hyukjae,Kim, Hangun,Nam, Sang-Jip,Fenical, William
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p. 3166 - 3172
(2020/11/02)
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- Exploration of Transaminase Diversity for the Oxidative Conversion of Natural Amino Acids into 2-Ketoacids and High-Value Chemicals
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The use of 2-ketoacids is very common in feeds, food additives, and pharmaceuticals, and 2-ketoacids are valuable precursors for a plethora of chemically diverse compounds. Biocatalytic synthesis of 2-ketoacids starting from l-amino acids would be highly desirable because the substrates are readily available from biomass feedstock. Here, we report bioinformatic exploration of a series of aminotransferases (ATs) to achieve the desired conversion. Thermodynamic control was achieved by coupling an l-glutamate oxidation reaction in the cascade for the recycling of the amine acceptor. These enzymes were able to convert a majority of proteinogenic amino acids into the corresponding 2-ketoacids with high conversion (up to 99percent) and atom-efficiency. Furthermore, this enzyme cascade was extendable, and one-pot two-step processes were established for the synthesis of d-amino acids and N-methylated amino acids, achieving great overall conversion (up to 99percent) and high ee values (>99percent). These developed enzymatic methodologies offer convenient routes for utilizing amino acids as synthetic reagents.
- Chen, Yanchun,Cui, Xuexian,Cui, Yinglu,Li, Chuijian,Li, Ruifeng,Li, Tao,Sun, Jinyuan,Wu, Bian,Zhu, Tong
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p. 7950 - 7957
(2020/08/21)
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- Peptide Tyrosinase Activators
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Peptides that increase melanin synthesis are provided. These peptides include pentapeptides YSSWY, YRSRK, and their variants. The peptides may activate the enzymatic activity of tyrosinase to increase melanin synthesis. The pharmaceutical, cosmetic, and other compositions including the peptides are also provided. The methods of increasing melanin production in epidermis of a subject are provided where the methods include administering compositions comprising an amount of one or more peptides effective to increase the melanin production. The methods also include treating vitiligo or other hypopigmentation disorders with compositions including one or more peptides.
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- Orthogonally protected bifunctional amino acid
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The present invention concerns novel orthogonally protected amino acids, there production and use for the synthesis of binding compounds usable in the diagnosis and treatment of proliferative diseases, in particular tumor diseases.
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Page/Page column title page; 19; 34
(2010/11/24)
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- N-methyl-homocysteines and their use as well as process for their production
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The synthesis of N-methyl-homocysteines and their use are described.
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- Preparation of N-Z-protected N-methylated amino acids
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A process for preparing N-protected N-alkylated amino acids of the formula I: in which the substituents have the meanings stated in the description, comprises mixing a compound of the formula II with a solution of potassium tert-butanolate in a non-protic organic solvent, and subsequently adding a C1-2-alkyl halide.
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- Preparation of N-protected N-alkylated amino acids
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A process for preparing N-protected N-alkylated amino acids of the formula STR1 where Rs and R1 -R3 have the meanings indicated in the description comprises adding a compound of the abovementioned formula where R3 is hydrogen to a solution of a base in a non-protic solvent and subsequently adding an alkylating agent.
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- Method for treatment or prophylaxis of gastro-intestinal disease
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A method for the therapeutic treatment and/or prophylaxis of gastro-intestinal diseases using a sulfodehydroabietic acid of the formula: STR1 or a pharmaceutically acceptable salt thereof is disclosed.
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