Abstract:
Novel polypeptides possessing biochemical and immunological properties of avian growth hormone are obtained by practice of recombinant DNA procedures. Novel DNA sequences are disclosed which are capable of directing the synthesis of such polypeptided in selected host microorganisms. In a preferred embodiment, a novel polypeptide with the properties of avian growth hormone of chicken species origins is produced as a result of bacterial expression of a novel plasmid, cGH-T21. This plasmid is harbored in transformed E.coli C600 cells deposited as A.T.C.C. 39182. Also disclosed is a DNA sequence capable of directing the synthesis of a novel polypeptide with the properties of avian growth hormone of turkey species origin.
Abstract:
A method and a kit for the isolation and quantitative detection of a selected target nucleic acid sequence from solution employing two probes. A first probe is complementary to one portion of the target and is covalently attached to a first complexing agent (e.g., either an antigen or an antibody). The second probe is complementary to a different portion of the target and is associated with a reporter group. Following hybridization of the target and two probes in solution, a solid support coated with a second complexing agent (i.e., a corresponding antibody or antigen) capable of binding to the first complexing agent on the first probe is employed to immobilize the target-probe hybrid complex. A plurality of types of first probes may be used. Each type is attached to the same sort of complexing agent but each includes a nucleic acid sequence which is complementary to a different portion of the target.
Abstract:
Manufacture of DNA sequences comprising structural genes coding for (1) a polypeptide having the amino acid sequence and properties of insulin-like growth factor I; for (2) a polypeptide having the amino acid sequence and properties of insulin-like growth factor II; and for (3) polypeptide analogs of insulin-like growth factor I and insulin-like growth factor II which differ from the naturally-occurring forms in terms of the identity and/or location of one or more amino acids, e.g., ADThr59 BD IGF-I and ADArg54Arg55 BD IGF-II.
Abstract:
Novel synthetic peptides having primary structural homology to a continuous sequence of amino acid residues of human growth hormone in a region spanning positions thirty-two to forty-six ("hGH32-46", or "deletion peptide"). In preferred forms, peptides of the invention comprehend: duplicate portions (i.e., sequence fragments) of hGH32-46; stereochemical analogs and fragment analogs of hGH32-46 including one or more amino acid residues in D-isomeric configuration; and, "interspecies" analogs and fragment analogs of hGH32-46 including one or more non-homologous amino acid residues duplicating variant residues present in corresponding positions in corresponding regions of heterologous species growth hormones. Peptides of the invention are administered to mammals contemporaneously with exogenous insulin to generate hypoglycemic effects greater than available through administration of insulin alone. A presently preferred heptapeptide has the sequence NH2-Glu-Glu-Ala-Tyr-Ile-Pro-Lys-COOH, and has insulin-potentiating activity greater than hGH32-46.
Abstract:
Novel immunologically active polypeptide for use in anti-parvovirus vaccines through structural analysis and characterization of the parvovirus genome. In a preferred embodiment, microbial expression of polypetides is secured through use of DNA vectors comprising DNA sequences duplicative of porcine parvovirus (PPV) genomic DNA. Microbially expressed polypeptides as well as synthetic replicas of polypeptides coded for by DNA sequences of the invention exhibit immunological activity in, e.g., plate binding assays.
Abstract:
Microbial synthesis of indigo dyestuff in indole-free media. Indigo production is preferably accomplished by genetic transformation of selected host cells having the capacity to produce and accumulate indole (either as a result of endogenous genomic capacity or genetic transformation) to incorporate the capacity for synthesis of an aromatic dioxygenase enzyme. Growth of transformed cells under suitable conditions facilitates aromatic dioxygenase enzyme catalyzed oxidative transformation of cellular indole, with consequent formation of indigo from the oxidized reaction products. In a highly preferred embodiment, E.coli cells having endogenous indole production capacity are transformed with a DNA expression vector comprising the structural gene for naphthalene dioxygenase, resulting in the microbial synthesis of isolatable quantities of indigo.
Abstract:
A mutated subtilisin suitable for admixture to washing compositions and exhibiting substantially improved stability over naturally occuring Bacillus serine proteases is prepared by expressing a modified gene encoding subtilisin in Bacillus subtilis. A preferred subtilisin analog product differs from wild-type Bacillus alkaline proteases by having any amino acid, and preferably serine, at position (218) in place of asparagine. The product is preferably produced in a strain of B. subtilis which is mutated to block synthesis of endogenous proteases. The method of replacing an Asn or Gly in an Asn-Gly sequence in order to improve pH and thermal stability may be applied to other sites in substilisin and to other proteins as well.
Abstract:
A method for culturing yeast capable of expressing an exogenous gene product wherein the yeast is cultured at about 25 C in a medium including balanced free amino acids at a concentration between about 20 g/l and about 160 g/l. Alternatively, yeast capable of expressing an exogenous gene product (e.g. the product of a gene introduced by the application of recombinant gene technology) may be introduced into a medium including a total carbon source concentration above but maintained as close to zero as possible, and cultured at about 25 C. A medium for fermentation of yeast capable of expressing an exogenous gene product includes balanced free amino acids at a concentration between about 20 g/l and about 160 g/l. The culture medium is preferably saturated with oxygen at least 30% of air saturation.
Abstract:
A yeast cell lysis buffer for enhancing the recovery of subcellular particles including an aqueous solution of a nonionic detergent at a concentration within the range of about 0.5% to about 1.0% by volume at a temperature within a range from about 3 C to about 8 C. Triton X-100 is a preferred nonionic detergent for use in the lysis buffer. This lysis buffer may be employed in a method of extracting subcellular particles (e.g. HBsAg particles) from cells (e.g. genetically transformed yeast cells) which are broken open in the presence of the lysis buffer.
Abstract:
A method for the preparation of a 3' end functionalized polynucleotide. An amine-functionalized solid phase support is treated sequentially with an anhydride, then with an 1-hydroxylamine. A polynucleotide is chemically synthesized on the treated support and is subsequently cleaved therefrom by hydrolysis of the amide bonds. A polynucleotide having a 3' free primary amine is recovered for use in hybridization assays and other uses.