Academic literature on the topic 'Enacyloxins'
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Journal articles on the topic "Enacyloxins":
Furukawa, Hiroyuki, Hiromasa Kiyota, Teiko Yamada, Manabu Yaosaka, Ryo Takeuchi, Toshihiko Watanabe, and Shigefumi Kuwahara. "Stereochemistry of Enacyloxins. Part 4." Chemistry & Biodiversity 4, no. 7 (July 2007): 1601–4. http://dx.doi.org/10.1002/cbdv.200790140.
Depoorter, Eliza, Evelien De Canck, Tom Coenye, and Peter Vandamme. "Burkholderia Bacteria Produce Multiple Potentially Novel Molecules that Inhibit Carbapenem-Resistant Gram-Negative Bacterial Pathogens." Antibiotics 10, no. 2 (February 2, 2021): 147. http://dx.doi.org/10.3390/antibiotics10020147.
Watanabe, Toshihiko, Hiromasa Kiyota, Ryo Takeuchi, Keijiro Enari, and Takayuki Oritani. "STEREOCHEMISTRY OF ENACYLOXINS 2.† STRUCTURE ELUCIDATION OF DECARBAMOYL ENACYLOXIN Ha AND IVa, NEW MEMBERS OF ENACYLOXIN ANTIBIOTICS FROM Frateuria sp. W-315‡." Heterocyclic Communications 7, no. 4 (January 2001): 313–16. http://dx.doi.org/10.1515/hc.2001.7.4.313.
Saito, Aki, Wataru Igarashi, Hiroyuki Furukawa, Hiroki Hoshikawa, Teiko Yamada, Shigefumi Kuwahara, and Hiromasa Kiyota. "Synthetic Studies of Enacyloxins: A Series of Antibiotics Isolated from Frateuria sp. W-315: C1′-C8′ and C9′-C15′ Fragments." Natural Product Communications 10, no. 4 (April 2015): 1934578X1501000. http://dx.doi.org/10.1177/1934578x1501000429.
Takeuchi, Ryo, Hiromasa Kiyota, Manabu Yaosaka, Toshihiko Watanabe, Keijiro Enari, Takeyoshi Sugiyama, and Takayuki Oritani. "Stereochemistry of enacyloxins. Part 3.1 (12′S,17′R,18′S,19′R)-Absolute configuration of enacyloxins, a series of antibiotics from Frateuria sp. W-315." Journal of the Chemical Society, Perkin Transactions 1, no. 20 (October 1, 2001): 2676–81. http://dx.doi.org/10.1039/b104341m.
Mahenthiralingam, Eshwar, Lijiang Song, Andrea Sass, Judith White, Ceri Wilmot, Angela Marchbank, Othman Boaisha, James Paine, David Knight, and Gregory L. Challis. "Enacyloxins Are Products of an Unusual Hybrid Modular Polyketide Synthase Encoded by a Cryptic Burkholderia ambifaria Genomic Island." Chemistry & Biology 18, no. 5 (May 2011): 665–77. http://dx.doi.org/10.1016/j.chembiol.2011.01.020.
WATANABE, TOSHIHIKO, TAKEYOSHI SUGIYAMA, and KAZUO IZAKI. "New polyenic antibiotics active against Gram-positive and Gram-negative bacteria. IX. Reclassification of a strain W-315 producing enacyloxins." Journal of Antibiotics 47, no. 4 (1994): 496–98. http://dx.doi.org/10.7164/antibiotics.47.496.
WATANABE, TOSHIHIKO, TAKEYOSHI SUGIYAMA, KOJI CHINO, TOMOKO SUZUKI, SUSUMU WAKABAYASHI, HIROYUKI HAYASHI, RYOKO ITAMI, JUN SHIMA, and KAZUO IZAKI. "New polyenic antibiotics active against Gram-positive and Gram-negative bacteria. VIII. Construction of synthetic medium for production of mono-chloro-congeners of enacyloxins." Journal of Antibiotics 45, no. 4 (1992): 476–84. http://dx.doi.org/10.7164/antibiotics.45.476.
Oyama, Ryo, Toshihiko Watanabe, Hiroko Hanzawa, Taketo Sano, Takeyoshi Sugiyama, and Kazuo Izaki. "An Extracellular Quinoprotein Oxidase That Catalyzes Conversion of Enacyloxin IVa to Enacyloxin IIa." Bioscience, Biotechnology, and Biochemistry 58, no. 10 (January 1994): 1914–17. http://dx.doi.org/10.1271/bbb.58.1914.
Watanabe, Toshihiko, Ryo Oyama, Hiroko Hanzawa, Takeyoshi Sugiyama, and Kazuo Izaki. "Enzymatic Properties of an Extracellular Quinoprotein, Enacyloxin Oxidase." Bioscience, Biotechnology, and Biochemistry 59, no. 1 (January 1995): 123–25. http://dx.doi.org/10.1271/bbb.59.123.
Dissertations / Theses on the topic "Enacyloxins":
Christin, Orane. "Synthèse totale de l’énacyloxine IIa, un antibiotique d’origine naturelle au mécanisme d’action original." Electronic Thesis or Diss., Université Paris Cité, 2023. http://www.theses.fr/2023UNIP5197.
Isolated in 1982 by Watanabe et al. from soil bacteria Frateuria sp. W-315, enacyloxin IIa is a polyenic antibiotic displaying a strong activity against both Gram-positive and Gram-negative bacteria as well as a slight activity against fungi. This rather complex polyketide consists of a 23 carbons linear chain bearing 6 stereogenic centers, whose one is chlorinated, alongside a conjugated chlorinated penta-ene attached to a cyclohexane with 3 stereogenic centers. The structural complexity of this target induces a high degree of synthetic difficulty involving the synthesis of the fragile polyene unit or the control of the halogenated carbon stereochemistry. Our retrosynthetic plan features the synthesis of fragments A, B and C prior to their assemblage through esterification and aldol reactions. The synthetic strategy developed for fragment C1-C16 relies on a key Pd(II)-catalyzed alkyne chloroallylation, resulting in the selective formation of the (Z)-vinyl chloride, followed by a Pd(II)/Cu(I)-catalyzed alkyne hydrocarbation of allenes and a final 1,2-elimination step to complete the polyenic chain formation. The synthesis of fragment A C1'-C6' relies on a ring closure metathesis, a Pd(0)-catalyzed carbonylation reaction, and a hydrogenation/isomerization one-pot sequence of the acrylate formed to generate the third stereogenic center. On the other hand, fragment C C17-C23 is obtained through a key L-prolinamide-catalyzed '-chlorination of aldehydes, resulting in the stereoselective formation of the desired chlorinated stereogenic center. Finally, the successful assemblage of fragments B and C was achieved through a diastereoselective Mukaiyama aldol reaction, providing access to the C1-C23 skeleton peculiar to the enacyloxin family. This manuscript also presents initial attempts to assemble fragments A and B
Risser, Fanny. "Études d’un mécanisme enzymatique et d’interactions inter-protéiques au sein de voies complexes de biosynthèse de polycétides Characterization of Intersubunit Communication in the Virginiamycin trans-Acyl Transferase Polyketide Synthase Understanding Intersubunit Interactions in the Enacyloxin Mixed cis- /trans-acyltransferase Modular Polyketide Synthase Insights into a dual function amide oxidase/macrocyclase form lankacidin biosynthesis." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0296.
Complex polyketides are secondary metabolites which are produced by a range of different organisms, and which present a broad spectrum of therapeutic activity. The modular organization of the enzymes responsible for their synthesis, the polyketide synthases (PKS), makes them attractive targets for synthetic biology aimed at obtaining new polyketide structures. One of the most promising strategies to date consists in swapping of whole sub-units between different PKS systems. However, the success of this strategy critically depends on understanding and exploiting ‘docking domains’ the protein sequences at the C- and N-terminal extremities of the subunits which are responsible for correctly ordering the polypeptides, and therefore for faithful chain transfer. To increase our knowledge of DDs, we investigated several interfaces in both trans-AT and cis-AT PKSs. This work led notably to the identification of the first family of DDs from trans-AT PKSs, and we were further able to characterize a complete interface formed between two consecutive subunits within the virginiamycin PKS. In addition, we showed that at least one DD of matched pairs is often an intrinsically disordered region (IDR), as this type of interaction motif allows for specific but medium affinity contacts. Indeed, in the enacyloxin hybrid cis-AT/trans-AT PKS which we also investigated extensively, docking at every interface is mediated by a C-terminal IDR. In addition, we demonstrated that multiple structural classes of DD are present within the system, but that variations of the electrostatic ‘code’ within an individual structural class can also be used to ensure specificity. Taken together, these results provide important guidelines for future attempts to deploy DDs in subunit engineering. Another attractive target for synthetic biology are the so-called ‘post-PKS’ enzymes, which chemically decorate the initially-formed structure, and are often essential for their bioactivity. In this context, we studied LkcE, a bi-functional enzyme that catalyzes a rare amide oxidation followed by an intramolecular Mannich reaction to yield the lankacidin macrocycle – both to understand its unusual mechanism and to evaluate its suitability as a general polyketide modifying enzyme. We solved four crystal structures of the enzyme, and characterized it kinetically. Together, our data allowed us to propose a detailed catalytic mechanism for LkcE, involving a large-scale conformational change of the enzyme to bring the substrate into a cyclisation-ready state. Moreover, we showed that LkcE displays a certain tolerance toward its substrate structures, suggesting its usefulness as a general catalyst for cyclisation/ligation reaction in synthetic biology and chemical synthesis