含喹诺酮的天然产物广泛存在于细菌、真菌和植物中。N-甲基-4-喹诺酮类真菌喹内酯类显示出广泛的生物活性。在这里,我们通过使用异源重组和体外酶促合成发现了一条简明的非核糖体肽合成酶途径,该途径参与了青霉菌的喹乳酸菌素 A 生物合成。通过在异源宿主中构建混合细菌和真菌途径,获得喹乳酸菌素 A的N-去甲基类似物。
reactions. In vitro assays reveal two single‐module non‐ribosomal peptide synthetases (NRPs) that incorporate the β‐keto acid and l‐isoleucine, followed by Dieckmann condensation, to form the quinolone‐γ‐lactam. Notably, the bioconversion from l‐kynurenine to the β‐keto acid is a unique strategy employed by nature to decouple R*‐domain‐containing NRPS from the polyketide synthase (PKS) machinery, expanding
Isotopic methods for measurement of tryptophan and metabolites thereof
申请人:ELECTROPHORETICS LIMITED
公开号:US11320438B2
公开(公告)日:2022-05-03
Tryptophan degradation is a key metabolic pathway controlling immune reactions and evidence suggests that during cancer progression generation of tryptophan metabolites may be fundamental for immune escape promoting the malignant phenotype of cancer cells in an autocrine fashion. The present invention relates to methods of measuring mass tag labelled tryptophan and metabolites thereof and methods using the labelled molecules for monitoring in a subject the effectiveness of a treatment and of disease recurrence after treatment, for stratifying patients and for diagnosing suppression of an immune response in a subject.
<i>N</i><sup>1</sup>-Fluoroalkyltryptophan Analogues: Synthesis and <i>in vitro</i> Study as Potential Substrates for Indoleamine 2,3-Dioxygenase
作者:Jean Henrottin、Astrid Zervosen、Christian Lemaire、Frédéric Sapunaric、Sophie Laurent、Benoit Van den Eynde、Serge Goldman、Alain Plenevaux、André Luxen
DOI:10.1021/ml500385d
日期:2015.3.12
tryptophan, two N (1)-fluoroalkylated tryptophan derivatives, are described here. In vitro enzymatic assays with these two new potentialsubstrates of hIDO show that 1-FETrp is a good and specificsubstrate of hIDO. Therefore, its radioactive isotopomer, 1-[(18)F]FETrp, should be a molecule of choice to visualize tumoral and inflammatory tissues and/or to validate new potential inhibitors.
Engineered Biosynthesis of Fungal 4-Quinolone Natural Products
作者:Mengting Liu、Masao Ohashi、Yi Tang
DOI:10.1021/acs.orglett.0c02426
日期:2020.8.21
Quinolone-containing naturalproducts are widely found in bacteria, fungi, and plants. The fungal quinolactacins, which are N-methyl-4-quinolones, display a wide spectrum of biological activities. Here we uncovered a concise nonribosomal peptide synthetase pathway involved in quinolactacin A biosynthesis from Penicillium by using heterologous reconstitution and in vitro enzymatic synthesis. The N-desmethyl
含喹诺酮的天然产物广泛存在于细菌、真菌和植物中。N-甲基-4-喹诺酮类真菌喹内酯类显示出广泛的生物活性。在这里,我们通过使用异源重组和体外酶促合成发现了一条简明的非核糖体肽合成酶途径,该途径参与了青霉菌的喹乳酸菌素 A 生物合成。通过在异源宿主中构建混合细菌和真菌途径,获得喹乳酸菌素 A的N-去甲基类似物。