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1.
Nat Biotechnol ; 25(11): 1281-9, 2007 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-17965706

RESUMO

The genus Sorangium synthesizes approximately half of the secondary metabolites isolated from myxobacteria, including the anti-cancer metabolite epothilone. We report the complete genome sequence of the model Sorangium strain S. cellulosum So ce56, which produces several natural products and has morphological and physiological properties typical of the genus. The circular genome, comprising 13,033,779 base pairs, is the largest bacterial genome sequenced to date. No global synteny with the genome of Myxococcus xanthus is apparent, revealing an unanticipated level of divergence between these myxobacteria. A large percentage of the genome is devoted to regulation, particularly post-translational phosphorylation, which probably supports the strain's complex, social lifestyle. This regulatory network includes the highest number of eukaryotic protein kinase-like kinases discovered in any organism. Seventeen secondary metabolite loci are encoded in the genome, as well as many enzymes with potential utility in industry.


Assuntos
Genoma Bacteriano/genética , Myxococcales/genética , Myxococcales/metabolismo , Sequência de Bases , Biotecnologia , Dados de Sequência Molecular , Myxococcales/classificação , Filogenia , Análise de Sequência de DNA
3.
J Biotechnol ; 107(1): 29-40, 2004 Jan 08.
Artigo em Inglês | MEDLINE | ID: mdl-14687969

RESUMO

Myxobacteria increasingly gain attention as a source of bioactive natural products. The genus Sorangium produces almost half of the secondary metabolites isolated from these microorganisms. Nevertheless, genetic systems for Sorangium strains are poorly developed, which makes the identification of the genes directing natural product biosynthesis difficult. Using biparental and triparental mating, we have developed methodologies for DNA transfer from Escherichia coli via conjugation for the genome sequencing model strain So ce56 and the secondary metabolite multiproducing strain So ce12. The conjugation protocol developed for strain So ce56 is not applicable to other Sorangium strains. Crucial points for the conjugation are the ratio of E. coli and Sorangium cellulosum cells, the choice of liquid or solid medium, the time used for the conjugation process and antibiotic selection in liquid medium prior to the plating of cells. A mariner-based transposon containing a hygromycin resistance gene was generated and used as the selectable marker for S. cellulosum. The transposon randomly integrates into the chromosome of both strains. As a proof of principle, S. cellulosum So ce12 transposon mutants were screened using an overlay assay to target the chivosazole biosynthetic gene cluster.


Assuntos
Conjugação Genética/genética , Proteínas de Ligação a DNA/biossíntese , Macrolídeos/metabolismo , Mutagênese Sítio-Dirigida/genética , Myxococcales/genética , Myxococcales/metabolismo , Engenharia de Proteínas/métodos , Elementos de DNA Transponíveis/genética , DNA Bacteriano/genética , Proteínas de Ligação a DNA/genética , Escherichia coli/genética , Escherichia coli/metabolismo , Regulação Bacteriana da Expressão Gênica/genética , Técnicas de Transferência de Genes , Proteínas Recombinantes/biossíntese , Proteínas Recombinantes/genética , Transposases
4.
Mol Biosyst ; 7(5): 1549-63, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21365089

RESUMO

The anti-fungal leupyrrins are secondary metabolites produced by several strains of the myxobacterium Sorangium cellulosum. These intriguing compounds incorporate an atypically substituted γ-butyrolactone ring, as well as pyrrole and oxazolinone functionalities, which are located within an unusual asymmetrical macrodiolide. Previous feeding studies revealed that this novel structure arises from the homologation of four distinct structural units, nonribosomally-derived peptide, polyketide, isoprenoid and a dicarboxylic acid, coupled with modification of the various building blocks. Here we have attempted to reconcile the biosynthetic pathway proposed on the basis of the feeding studies with the underlying enzymatic machinery in the S. cellulosum strain So ce690. Gene products can be assigned to many of the suggested steps, but inspection of the gene set provokes the reconsideration of several key transformations. We support our analysis by the reconstitution in vitro of the biosynthesis of the pyrrole carboxylic starter unit along with gene inactivation. In addition, this study reveals that a significant proportion of the genes for leupyrrin biosynthesis are located outside the core cluster, a 'split' organization which is increasingly characteristic of the myxobacteria. Finally, we report the generation of four novel deshydroxy leupyrrin analogues by genetic engineering of the pathway.


Assuntos
4-Butirolactona/análogos & derivados , Myxococcales/metabolismo , Proteínas de Plantas/metabolismo , 4-Butirolactona/biossíntese , 4-Butirolactona/química , Sequência de Aminoácidos , Vias Biossintéticas , DNA Bacteriano/genética , Eletroforese em Gel de Poliacrilamida , Dados de Sequência Molecular , Estrutura Molecular , Família Multigênica/genética , Myxococcales/genética , Proteínas de Plantas/genética , Reação em Cadeia da Polimerase , Homologia de Sequência de Aminoácidos , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz
5.
Chembiochem ; 8(7): 813-9, 2007 May 07.
Artigo em Inglês | MEDLINE | ID: mdl-17407127

RESUMO

Glycosylations are well-established steps in numerous biosynthetic pathways, and the attached sugar moieties often influence the specificity or pharmacology of the modified compounds. The sorangicins belong to the polyketide family of natural products, and exhibit antibiotic activity through inhibition of bacterial RNA polymerase. We have identified the sorangicin biosynthetic gene cluster in the producing myxobacterium Sorangium cellulosum So ce12. Within the cluster, sorF encodes a putative glycosyltransferase. To determine its function in sorangicin biosynthesis, SorF was heterologously expressed as a fusion protein in Escherichia coli. After purification by affinity chromatography, SorF was found to glucosylate sorangicin A in vitro, utilizing UDP-alpha-D-glucose as the natural donor substrate. Additionally, SorF showed high flexibility towards further UDP- and dTDP-sugars and was able to transfer several other sugar moieties-alpha-D-galactose, alpha-D-xylose, beta-L-rhamnose, and 6-deoxy-4-keto-alpha-D-glucose-onto the aglycon. SorF is therefore one of the rare glycosyltransferases able to transfer both D- and L-sugars, and could thus be used to generate novel sorangiosides.


Assuntos
Glicosiltransferases/metabolismo , Sequência de Bases , Primers do DNA , Eletroforese em Gel de Poliacrilamida , Glicosilação , Myxococcales/enzimologia , Especificidade por Substrato
6.
Chembiochem ; 6(7): 1277-86, 2005 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-15892181

RESUMO

Myxobacteria show a high potential for the production of natural compounds that exhibit a wide variety of antibiotic, antifungal, and cytotoxic activities. The genus Sorangium is of special biotechnological interest because it produces almost half of the secondary metabolites isolated from these microorganisms. We describe a transposon-mutagenesis approach to identifying the disorazol biosynthetic gene cluster in Sorangium cellulosum So ce12, a producer of multiple natural products. In addition to the highly effective disorazol-type tubulin destabilizers, S. cellulosum So ce12 produces sorangicins, potent eubacterial RNA polymerase inhibitors, bactericidal sorangiolides, and the antifungal chivosazoles. To obtain a transposon library of sufficient size suitable for the identification of the presumed biosynthetic gene clusters, an efficient transformation method was developed. We present here the first electroporation protocol for a strain of the genus Sorangium. The transposon library was screened for disorazol-negative mutants. This approach led to the identification of the corresponding trans-acyltransferase core biosynthetic gene cluster together with a region in the chromosome that is likely to be involved in disorazol biosynthesis. A third region in the genome harbors another gene that is presumed to be involved in the regulation of disorazol production. A detailed analysis of the biosynthetic and regulatory genes is presented in this paper.


Assuntos
Myxococcales/genética , Myxococcales/metabolismo , Sequência de Aminoácidos , Southern Blotting , Cromatografia Líquida de Alta Pressão , Elementos de DNA Transponíveis/genética , Eletroporação , Dados de Sequência Molecular , Família Multigênica , Myxococcales/enzimologia , Oxazóis/metabolismo , Policetídeo Sintases/genética , Policetídeo Sintases/metabolismo , Engenharia de Proteínas , Proteínas Recombinantes/biossíntese , Proteínas Recombinantes/genética
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