Polyketide Synthase
Mostrando 1-12 de 125 artigos, teses e dissertações.
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1. Isolation and expression of two polyketide synthase genes from Trichoderma harzianum 88 during mycoparasitism
Abstract Metabolites of mycoparasitic fungal species such as Trichoderma harzianum 88 have important biological roles. In this study, two new ketoacyl synthase (KS) fragments were isolated from cultured Trichoderma harzianum 88 mycelia using degenerate primers and analysed using a phylogenetic tree. The gene fragments were determined to be present as single
Braz. J. Microbiol.. Publicado em: 2016-06
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2. Characterisation of pks15/1 in clinical isolates of Mycobacterium tuberculosis from Mexico
Tuberculosis (TB) is an infectocontagious respiratory disease caused by members of the Mycobacterium tuberculosis complex. A 7 base pair (bp) deletion in the locus polyketide synthase (pks)15/1 is described as polymorphic among members of the M. tuberculosis complex, enabling the identification of Euro-American, Indo-Oceanic and Asian lineages. The aim of th
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-09
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3. Mapeamento do potencial biossintético em linhagens de Streptomyces / Mapping the biosynthetic potential in Streptomyces strains
Actinobacteria are important sources of new molecules with biological activities. Streptomyces are the most important genera studied. Such microorganisms carries out among a variety of biosynthetic enzimes, two main groups known as polyketide synthase (PKS) and non ribosomal peptide synthetase (NRPS), both catalyzing the biosynthesis of polyketide and non ri
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2011
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4. Unusual intron in the second exon of a Type III polyketide synthase gene of Alpinia calcarata Rosc.
Plant phenolic compounds form a valuable resource of secondary metabolites having a broad spectrum of biological activities. Type III polyketide synthases play a key role in the formation of basic structural skeleton of the phenolic compounds. As a group of medicinal plants, PKSs with novel features are expected in the genome of Zingiberaceae. The genomic ex
Genetics and Molecular Biology. Publicado em: 2010
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5. Antimicrobial metabolites and siderophore produced by strains from Anthropogenic Dark Earth of the Occidental Amazon / "Produção de metabólitos antimicrobianos e sideróforos de isolados provenientes de Terra Preta Antropogênica da Amazônia Ocidental"
Os microrganismos atraem considerável atenção por serem uma fonte de compostos biotecnológicos e farmacêuticos. Diversos produtos naturais peptídicos produzidos por fungos e bactérias são sintetizados por grandes enzimas, conhecidas como peptídeo sintetase não ribossômica (NRPS) e policetídeo sintase (PKS). A bioprospecção dos microrganismos is
Publicado em: 2006
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6. "Caracterização molecular de cianobactérias brasileiras e distribuição de genes de produtos naturais" / Molecular characterization of Brazilian cyanobacteria and distribution of natural products genes
O espaço intergênico (IGS) juntamente com suas subunidades flanqueadoras (cpcB) e (cpcA) do operon do ficocianina foi usado para identificar linhagens de cianobactérias. Dentro do domínio Bacteria somente as cianobactérias possuem o operon da ficocianina e a região cpcBA-IGS é suficientemente variável para diferenciar linhagens desses microrganismos.
Publicado em: 2006
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7. Organization of the biosynthetic gene cluster for the polyketide anthelmintic macrolide avermectin in Streptomyces avermitilis
Analysis of the gene cluster from Streptomyces avermitilis that governs the biosynthesis of the polyketide anthelmintic avermectin revealed that it contains four large ORFs encoding giant multifunctional polypeptides of the avermectin polyketide synthase (AVES 1, AVES 2, AVES 3, and AVES 4). These clustered polyketide synthase genes responsible for avermecti
The National Academy of Sciences.
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8. SEARCHPKS: a program for detection and analysis of polyketide synthase domains
SEARCHPKS is a software for detection and analysis of polyketide synthase (PKS) domains in a polypeptide sequence. Modular polyketide synthases are unusually large multi-enzymatic multi-domain megasynthases, which are involved in the biosynthesis of pharmaceutically important natural products using an assembly-line mechanism. This program facilitates easy id
Oxford University Press.
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9. Expression of a functional fungal polyketide synthase in the bacterium Streptomyces coelicolor A3(2).
The multifunctional 6-methylsalicylic acid synthase gene from Penicillium patulum was engineered for regulated expression in Streptomyces coelicolor. Production of significant amounts of 6-methylsalicylic acid by the recombinant strain was proven by nuclear magnetic resonance spectroscopy. These results suggest that it is possible to harness the molecular di
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10. Cloning and characterization of a polyketide synthase gene from Streptomyces fradiae Tü2717, which carries the genes for biosynthesis of the angucycline antibiotic urdamycin A and a gene probably involved in its oxygenation.
A DNA fragment was cloned as cosmid purd8, which encodes a polyketide synthase involved in the production of the angucycline antibiotic urdamycin from Streptomyces fradiae Tü2717. Deletion of the polyketide synthase genes from the chromosome abolished urdamycin production. In addition, purd8 conferred urdamycin resistance on introduction into Streptomyces l
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11. Multiple genetic modifications of the erythromycin polyketide synthase to produce a library of novel “unnatural” natural products
The structures of complex polyketide natural products, such as erythromycin, are programmed by multifunctional polyketide synthases (PKSs) that contain modular arrangements of functional domains. The colinearity between the activities of modular PKS domains and structure of the polyketide product portends the generation of novel organic compounds—“unnatu
The National Academy of Sciences.
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12. Direct evidence that the rifamycin polyketide synthase assembles polyketide chains processively
The assembly of the polyketide backbone of rifamycin B on the type I rifamycin polyketide synthase (PKS), encoded by the rifA–rifE genes, is terminated by the product of the rifF gene, an amide synthase that releases the completed undecaketide as its macrocyclic lactam. Inactivation of rifF gives a rifamycin B nonproducing mutant that still accumulates a s
The National Academy of Sciences.