Abstract: Recombinant S. aureofaciens cells are provided. These cells comprise: (a) at least one CTC 11 gene; and (b) optionally(i) a CTC 09 gene;(ii) a CTC 03 gene; or(iii) a combination thereof;wherein:the CTC 11 gene is chromosomal, extra-chromosomal, or chromosomal and extra-chromosomal;the CTC 09 gene, CTC 03 gene, or a combination thereof is chromosomal, extra-chromosomal, or a combination thereof; expression of the CTC 11 gene is enhanced over that of a wild-type S. aureofaciens cell; andoptionally, the CTC 09 gene, the CTC 03 gene, or both of the CTC 09 gene and the CTC 03 gene are inactivated.The present invention also contemplates vector pLP21329 and vectors for allelic replacement in a S. aureofaciens host cell. The vectors comprise:(a) a functional E.

Abstract: Novel recombinant DNA cosmid shuttle vectors and a method of using them in the construction of genomic DNA libraries are described. The vectors demonstrate the incorporation of both the size selection and in vitro packaging mechanisms of lambda into a Streptomyces-E. coli shuttle vector by the incorporation of two or more COS sequences of bacteriophage lambda.

Abstract: A novel method of selecting Streptomyces recombinant DNA-containing host cells and vectors useful in exemplifying the method are described. The vectors confer apramycin resistance to sensitive Streptomyces host cells and thus provide a convenient method of selecting Streptomyces transformants. The apramycin resistance-conferring gene used in the method is an acetyltransferase aac(3)IV gene and can be isolated from E. coli K12 BE1041/pKC309 (NRRL B-15827) on an .about.1.5 kb PstI-EcoRI restriction fragment.

Abstract: The invention relates to a method and cloning vehicle for the expression of a functional polypeptide in Streptomyces. A recombinant DNA cloning vehicle was genetically engineered to bring the expression of the neomycin phosphotransferase gene under the control of the Escherichia coli bacteriophage .lambda.p.sub.L promoter.

Abstract: The present invention discloses selectable, recombinant DNA shuttle vectors for use in streptomycetes and E. coli. The shuttle vectors of the present invention are present at moderately high copy number. The invention further discloses transformants of the aforementioned vectors.

Abstract: The present invention disclosed novel recombinant DNA cloning vectors including pMND1000 and vectors derived therefrom for use in Streptomyces and related organisms. These novel cloning vectors contain genetic markers that provide antibiotic resistance or colorimetric selectivity to the host cells. The invention further comprises transformants of the aforementioned vectors.

Abstract: The present invention disclosed novel recombinant DNA cloning vectors for use in Streptomyces and related organisms. These novel cloning vectors contain genetic markers that provide antibiotic resistance or colorimetric selectivity to the host cells. The invention further comprises transformants of the aforementioned vectors.

Abstract: A novel method of selecting Streptomyces recombinant DNA-containing host cells and vectors useful in the method are described. The vectors confer tylosin resistance to sensitive Streptomyces host cells and thus provide a convenient method of selecting Streptomyces transformants. The novel tylosin resistance-conferring gene described can be isolated on an .about.2.6 kb KpnI restriction fragment from plasmid pSVB2. Plasmid pSVB2 can be isolated from Streptomyces lividans TK23/pSVB2 (NRRL 15880).

Abstract: The present invention discloses selectable recombinant DNA cloning vectors for use in Streptomyces.

Abstract: Deoxynarasin antibiotic complex, comprising 20-deoxynarasin and 20-deoxy-epi-17-narasin, is produced by submerged aerobic fermentation of Streptomyces aureofaciens NRRL 11181. 20-Deoxynarasin and 20-deoxy-epi-17-narasin are separated and isolated by chromatography. The deoxynarasin complex, 20-deoxynarasin and 20-deoxy-epi-17-narasin are antibacterial and anticoccidial agents and also increase feed-utilization efficiency in ruminants.