The present disclosure provides a spiramycin-producing strain, a carrimycin-producing strain, construction method therefor, use thereof and method for increasing the product yield thereof. The provided spiramycin-producing strain has an inactivated gene Lrp (Δlrp-SP); and the strain has a preservation number of CGMCC No.16056. The provided carrimycin-producing strain has an inactivated gene Lrp (Δlrp-BT); and the strain has a preservation number of CGMCC No.16055. By inactivating the gene Lrp, the yields of spiramycin and carrimycin are increased; and particularly the yield and proportion of a major component of the carrimycin, that is, 4″-O-isovalerylspiramycin III are significantly increased.

Provided are biologically pure bacterial isolates characterized by a genome structure at least 90% similar to a genome structure of a bacterial species selected from the group consisting of: Streptomyces sp. E128 having an NRRL Accession No. B-67462, Bacillus amyloliquefaciens A190 having an NRRL Accession No. B-67464, Bacillus subtilis P243 having an NRRL Accession No. B-67459, Bacillus thuringiensis M979 having an NRRL Accession No. B-67457, Massilia aurea P63 having an NRRL Accession No. B-67461, Rhodococcus sp. G706, Stenotrophomonas maltophilia E132 having an NRRL Accession No. B-67460, Streptomyces aurantiacus A918, Streptomyces badius 0180, Streptomyces mirabilis B670 having an NRRL Accession No. B67463, Streptomyces scopuliridis F427 having an NRRL Accession No. B-67458, and Streptomyces sp. L219. Also provided are whole cell broth or lysates thereof, and polynucleotide, polypeptides and constructs expressing same, compositions-of-matter comprising same and methods using same for killing or inhibiting the development of insects.

The present invention provides Streptomyces coelicolor strain A3(2)_M22-2C43 obtained by inducing a point mutation in the base sequence of the DagB gene in a wild-type Streptomyces coelicolor strain A3(2) by UV radiation. Since the Streptomyces coelicolor strain A3(2)_M22-2C43 according to the present invention expresses a DagB mutant enzyme expressing little or no DagB beta-agarase or exhibiting little or no beta-agarase activity, there is no need for separate isolation and purification of DagA enzymes from culture fluid, and the culture fluid of the Streptomyces coelicolor strain A3(2)_M22-2C43 or supernatant thereof may be used to produce, from agar or agarose, neoagarose oligosaccharides with a higher content of neoagarotetraose or neoagarohexaose than that of neoagarobiose.

Provided are biologically pure bacterial isolates characterized by a genome structure at least 90% similar to a genome structure of a bacterial species selected from the group consisting of: Streptomyces sp. E128 having an NRRL Accession No. B-67462, Bacillus amyloliquefaciens A190 having an NRRL Accession No. B-67464, Bacillus subtilis P243 having an NRRL Accession No. B-67459, Bacillus thuringiensis M979 having an NRRL Accession No. B-67457, Massilia aurea P63 having an NRRL Accession No. B-67461, Rhodococcus sp. G706, Stenotrophomonas maltophilia E132 having an NRRL Accession No. B-67460, Streptomyces aurantiacus A918, Streptomyces badius O180, Streptomyces mirabilis B670 having an NRRL Accession No. B67463, Streptomyces scopuliridis F427 having an NRRL Accession No. B-67458, and Streptomyces sp. L219. Also provided are whole cell broth or lysates thereof, and polynucleotide, polypeptides and constructs expressing same, compositions-of-matter comprising same and methods using same for killing or inhibiting the development of insects.

The present invention relates to methods for enhancing at least one growth parameter of a leguminous plant via co-inoculation of a leguminous plant with at least one rhizobial microorganism together with at least one actinobacterial microorganism. In further aspects, the present invention also relates to leguminous plants co-inoculated with at least one rhizobial microorganism together with at least one actinobacterial microorganism, as well as specific actinobacterial strains and inoculant compositions which are useful in accordance with the present invention.

Provided are any one novel compound selected from the group consisting of 9-deoxo-36,37-dihydro-prolyl FK506, 9-deoxo-31-O-demethyl-36,37-dihydro-prolyl FK506, 9-deoxo-prolyl FK520, and 9-deoxo-31-O-demethyl-prolyl FK520, and use thereof.

A novel PSL family prenyltransferase has relaxed substrate specificity, which can use a variety of cyclic dipeptides and prenyl donors as substrates to produce various terpenylated diketopiperazines. An amino acid sequence of the prenyltransferase is SEQ ID NO: 1. An application of the prenyltransferase is transferring different prenyl groups to Trp-containing cyclic dipeptides. The prenyltransferase catalyzes the formation of terpenylated diketopiperazines by assembling prenyl groups onto cyclic dipeptides, which provides a new strategy for drug development of diketopiperazines.

The present invention relates to a method of preparing a gene cluster construct including a plurality of genes encoding a multi-modular biosynthetic enzyme, the method including (A) a step of preparing a plurality of DNA fragments which are capable of reconstructing the gene cluster construct and have structures that can be ligated to each other and (B) a step of ligating the plurality of DNA fragments prepared in the step (A) to each other by mixing the plurality of DNA fragments in a solution to obtain the gene cluster construct.

The present invention relates to a method for preparing a plasmid containing DNA that encodes a Type I polyketide synthase (PKS), the method including a step of introducing a DNA construct containing tandem repeats of DNA that encodes a PKS into a Bacillus subtilis competent cell.

The present invention relates to methods for enhancing at least one growth parameter of a leguminous plant via co-inoculation of a leguminous plant with at least one rhizobial microorganism together with at least one actinobacterial microorganism. In further aspects, the present invention also relates to leguminous plants co-inoculated with at least one rhizobial microorganism together with at least one actinobacterial microorganism, as well as specific actinobacterial strains and inoculant compositions which are useful in accordance with the present invention.