نتایج جستجو برای: streptomyces avermitilis
تعداد نتایج: 13460 فیلتر نتایج به سال:
We have examined the expression of pnp encoding the 3'-5'-exoribonuclease, polynucleotide phosphorylase, in Streptomyces antibioticus. We show that the rpsO-pnp operon is transcribed from at least two promoters, the first producing a readthrough transcript that includes both pnp and the gene for ribosomal protein S15 (rpsO) and a second, Ppnp, located in the rpsO-pnp intergenic region. Unlike t...
Avermectin (AVM) and ivermectin (IVM) are potent pesticides and acaricides which have been widely used during the past 30 years. As insect resistance to AVM and IVM is greatly increasing, alternatives are urgently needed. Here, we report two novel AVM derivatives, tenvermectin A (TVM A) and TVM B, which are considered a potential new generation of agricultural and veterinary drugs. The molecule...
Secondary metabolites (or natural products) are often synthesized by multi-modular, multi-domain proteins called non-ribosomal peptide synthetases (NRPS) and polyketide synthases (PKS). Various well-known metabolites produced by microorganisms are listed in Table 1, and examples of structures are shown in Fig. 1. In particular, Streptomyces species are known for their ability to produce a wide ...
Entomopathogenic fungi can produce a series of chitinases, some of which act synergistically with proteases to degrade insect cuticle. However, chitinase involvement in insect fungus pathogenesis has not been fully characterized. In this paper, an endochitinase, Bbchit1, was purified to homogeneity from liquid cultures of Beauveria bassiana grown in a medium containing colloidal chitin. Bbchit1...
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