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actinomycosis/пролин
Веза се чува у привремену меморију
Страна 1 од 31 резултати
Identification and characterization of 2-oxoglutarate-dependent dioxygenases catalyzing selective cis-hydroxylation of proline and pipecolinic acid from actinomycetes.
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Microbial hydroxylases were screened for the capacity to effect direct hydroxylation of proline and pipecolinic acid, based on genomic information. Of the eight candidates screened, 2-oxoglutarate-dependent hydroxylase from Streptosporangium roseum NBRC 3776(T) and aspartyl/asparaginyl β-hydroxylase
Saccharopolytide A, a new cyclic tetrapeptide with rare 4-hydroxy-proline moieties from the deep-sea derived actinomycete Saccharopolyspora cebuensis MCCC 1A09850.
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A genome mining analysis on the deep-sea derived actinomycete Saccharopolyspora cebuensis MCCC 1A09850 indicated its potential to produce polypeptides. Accordingly, a systematic chemical investigation was conducted, which resulted in the isolation of one new cyclic tetrapeptide (saccharopolytide A,
The chromosomal integration site of the Streptomyces element pSAM2 overlaps a putative tRNA gene conserved among actinomycetes.
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The pSAM2 element of Streptomyces ambofaciens integrates site-specifically in the genome of different Streptomyces species by recombination between a 58 bp sequence common to the plasmid (attP) and the chromosome (attB). Southern hybridization analysis showed that sequences similar to the pSAM2 attB
Proline-specific endopeptidases from microbial sources: isolation of an enzyme from a Xanthomonas sp.
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An extensive screening among microorganisms for the presence of post-proline-specific endopeptidase activity was performed. This activity was found among ordinary bacteria from soil samples but not among fungi and actinomycetes. This result is in contrast to the previous notion that this activity is
Different type 1 fimbrial genes and tropisms of commensal and potentially pathogenic Actinomyces spp. with different salivary acidic proline-rich protein and statherin ligand specificities.
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Actinomyces spp. exhibit type 1 fimbria-mediated adhesion to salivary acidic proline-rich proteins (PRPs) and statherin ligands. Actinomyces spp. with different animal and tissue origins belong to three major adhesion types as relates to ligand specificity and type 1 fimbria genes. (i) In
Delta-1-piperideine-6-carboxylate dehydrogenase, a new enzyme that forms alpha-aminoadipate in Streptomyces clavuligerus and other cephamycin C-producing actinomycetes.
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Delta-1-Piperideine-6-carboxylate (P6C) dehydrogenase activity, which catalyses the conversion of P6C into alpha-aminoadipic acid, has been studied in the cephamycin C producer Streptomyces clavuligerus by both spectrophotometric and radiometric assays. The enzyme has been purified 124-fold to
The bacterial attachment site of the temperate Rhizobium phage 16-3 overlaps the 3' end of a putative proline tRNA gene.
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Bacteriophage 16-3 inserts its genome into the chromosome of Rhizobium meliloti strain 41 (Rm41) by site-specific recombination. The DNA regions around the bacterial attachment site (attB) and one of the hybrid attachment sites bordering the integrated prophage (attL) were cloned and their
Enzymatic synthesis of dehydroderivatives from proline-containing cyclic dipeptides and their effects toward cell division.
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We have previously isolated cyclo(L-Pro-L-Tyr) and cyclo(L-Phe-L-Pro) from an actinomycete by a novel enzymatic conversion-guided method. Their tetradehydro derivatives, cyclo(DeltaPro-DeltaTyr) and cyclo(DeltaPhe-DeltaPro), were enzymatically prepared. Neither of them inhibited cell division, in
Cloning of Frankia species putative tRNA(Pro) genes and their efficacy for pSAM2 site-specific integration in Streptomyces lividans.
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pSAM2 is a conjugative Streptomyces ambofaciens mobile genetic element that can transfer and integrate site specifically in the genome. The chromosomal attachment site (attB) for pSAM2 site-specific recombination for two Frankia species was analyzed. It overlaps putative proline tRNA genes having a
Salt stress control of intracellular solutes in streptomycetes indigenous to saline soils.
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Actinomycetes were isolated from a number of saline and saline-sodic California soils. From these isolates, two species of Streptomyces (S. griseus and S. californicus) were selected to assess their physiological response to salinity. NaCl was more inhibitory to growth rates and specific growth
Structure assignment of lucentamycin E and revision of the olefin geometries of the marine-derived lucentamycins.
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A new lucentamycin analogue, lucentamycin E (5), was isolated from the culture broth of the marine-derived actinomycete Nocardiopsis lucentensis, strain CNR-712. The absolute stereostructure of 5 was assigned by comprehensive analyses of NMR data and by application of the advanced Marfey's method.
Age-dependent changes in extracellular proteins, aminopeptidase and proteinase activities in Frankia isolate BR.
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To investigate protein secretion by the nitrogen-fixing actinomycete Frankia isolate BR, we designed a rapid DEAE adsorption, salt elution and Biogel P6DG desalination method to concentrate protein from the growth medium. Secreted proteins reached a maximum concentration (5.6 gm l-1) in the medium
Investigating the biosynthetic origin of the nitro group in pyrrolomycins.
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Feasible modes of introducing the nitro group into pyrrolomycin antibiotics were investigated based on incorporation of (15)N-labeled arginine and proline into dioxapyrrolomycin, produced by the actinomycete culture LL-F42248. Biosynthesis of nitrated pyrrolomycins was unaffected by the presence of
Positive selection of antibiotic-producing soil isolates.
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Stepwise discriminant analysis was used to identify the most powerful selective substrates which could be used to formulate media capable of enriching for antibiotic-producing soil isolates. This was achieved by characterizing a collection of 74 soil bacteria, including eubacteria and actinomycetes,
Physiology and genetics of antibiotic production and resistance.
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Actinomycetes have the genetic capability to synthesize many different biologically active secondary metabolites and of these compounds, antibiotics predominate in therapeutic and commercial importance. Intensive research often centres on the use of molecular techniques to investigate the physiology
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