摘要:
The invention relates to a method of producing a human growth hormone having the amino acid sequence of naturally occurring human growth hormone which comprises
a) producing in a microbial host a first polypeptide which is characterized by the presence of one or more additional amino acids at the N-terminus of the amino acid sequence of naturally occurring human growth hormone; b) contacting the first polypeptide so produced with an enzyme, preferably an aminopeptidase, so as to produce a second polypeptide having the amino acid sequence of naturally occurring human growth hormone; and c) recovering the second polypeptide so produced.
A preferred microbial host is a bacterium, especially E. coli .
摘要:
An improved vector which upon introduction into a suitable host containing the thermolabile repressor C I renders the host capable of effecting expression of a desired gene. The vector is a double-stranded DNA molecule which includes in 5' to 3' order the following: the promoter and operator P L O L from lambda bacteriophage; the N utilization site; a first restriction enzyme site which follows thereafter; a ribosomal binding site; an ATG initiation codon or DNA which is converted into an ATG initiation codon upon insertion of the desired gene into the vector; a second restriction enzme site for inserting the gene in phase with the ATG initiation codon; an origin of replication and either a gene associated with a selectable or identifiable phenotypic trait manifested when the vector is present in the host or a fragment designated cI⁴³⁴ which includes the gene for the cI⁴³⁴ repressor protein and its associated promoter and operator. The distance between the 3' end of P L O L and the 5' end of the N utilization site is less than about 80 base pairs. The distance between the 3' end of the N utilization site and the 5' end of the ribosomal binding site is less than about 300 base pairs. Vectors of the invention may also include a T₁T₂ rRNA transcription termination sequence located 3' of the second restriction enzyme site. The inventive vectors may have origin of replications capable of autonomous production in the host of at least 400 constitutive copies. Plasmids have been constructed from the vectors and used to produce bovine, chicken, porcine and human growth hormones, human apolipoprotein E and human superoxide dismutase and analogs thereof in host cells. Such superoxide dismutase or analogs thereof may be used to catalyze the reduction of superoxide radicals, reduce reperfusion injury, prolong the survival time of isolated organs and prevent neurological injury. Enzymatically active eucaryotic superoxide dismutase or an analog thereof may also be produced by an improved method of this invention which employs a production medium having a concentration of Cu⁺⁺ greater than about about 2ppm. The invention also concerns improved methods of recovering purified enzymatically active eucaryotic superoxide dismutase or analogs thereof.
摘要:
An improved vector which upon introduction into a suitable host containing the thermolabile repressor C I renders the host capable of effecting expression of a desired gene. The vector is a double-stranded DNA molecule which includes in 5' to 3' order the following: the promoter and operator P L O L from lambda bacteriophage; the N utilization site; a first restriction enzyme site which follows thereafter; a ribosomal binding site; an ATG initiation codon or DNA which is converted into an ATG initiation codon upon insertion of the desired gene into the vector; a second restriction enzme site for inserting the gene in phase with the ATG initiation codon; an origin of replication and either a gene associated with a selectable or identifiable phenotypic trait manifested when the vector is present in the host or a fragment designated cI⁴³⁴ which includes the gene for the cI⁴³⁴ repressor protein and its associated promoter and operator. The distance between the 3' end of P L O L and the 5' end of the N utilization site is less than about 80 base pairs. The distance between the 3' end of the N utilization site and the 5' end of the ribosomal binding site is less than about 300 base pairs. Vectors of the invention may also include a T₁T₂ rRNA transcription termination sequence located 3' of the second restriction enzyme site. The inventive vectors may have origin of replications capable of autonomous production in the host of at least 400 constitutive copies. Plasmids have been constructed from the vectors and used to produce bovine, chicken, porcine and human growth hormones, human apolipoprotein E and human superoxide dismutase and analogs thereof in host cells. Such superoxide dismutase or analogs thereof may be used to catalyze the reduction of superoxide radicals, reduce reperfusion injury, prolong the survival time of isolated organs and prevent neurological injury. Enzymatically active eucaryotic superoxide dismutase or an analog thereof may also be produced by an improved method of this invention which employs a production medium having a concentration of Cu⁺⁺ greater than about about 2ppm. The invention also concerns improved methods of recovering purified enzymatically active eucaryotic superoxide dismutase or analogs thereof.
摘要:
Plasmids are provided which upon introduction into a suitable Escherichia coli host render the host capable of effecting expression of DNA encoding a desired naturally-occurring polypeptide or polypeptide analog thereof under the control of the deo P1-P2 promoter. Further plasmids are also provided which thermoinducibly direct expression of eucaryotic genes under the control of a λ P L promoter and a thermolabile repressor protein present on the same plasmid under the control of a deo P1 promoter. These plasmids have been inserted into various hosts, some of which contain DNA encoding the repressor protein. Such plasmids may be used to produce polypeptides such as human copper/zinc superoxide dismutase, hMnSOD-hGPX fusion polypeptides, human manganese superoxide dismutase, human growth hormone, bovine growth, porcine growth, human growth hormone-apolipoprotein E fused polypeptides, apolipoprotein E and various fibronectin domains.
摘要:
A double-stranded cDNA molecule which includes DNA encoding human manganese superoxide dismutase has been created. The sequence of one strand of a double-stranded DNA molecule which encodes human manganese superoxide dismutase has been discovered. Such molecules may be introduced in prokaryotic, e.g., bacterial, or eucaryotic, e.g., yeast or mammalian, cells and the resulting cells cultured or grown under suitable conditions so as to produce human manganese superoxide dismutase, human manganese superoxide dismutase analogs or human manganese superoxide dismutase mutants which may then be recovered. By this invention, human manganese superoxide dismutase gene fragments from various plasmids may be ligated to yield a complete genomic human manganese superoxide dismutase gene fragment. Human manganese superoxide dismutase, analogs, or mutants may be used to catalyze the reduction of superoxide radicals, reduce reperfusion injury, prolong the survival time of isolated organs, or treat inflammations. The invention also concerns a method of producing enzymatically active human manganese superoxide dismutase compounds in a bacterial cell which contains and is capable of expressing a DNA sequence encoding the superoxide dismutase compound by maintaining the bac terial cell under suitable conditions and in a suitable production medium. The production medium is supplemented with an amount of Mn⁺⁺ so that the concentration of Mn⁺⁺ in the medium is greater than about 2 ppm. Genomic manganese superoxide dismutase DNA should also be capable of expression in eucaryotic cells under suitable conditions. This invention also concerns a method of recovering purified enzymatically active manganese superoxide dismutase, analogs or mutants from bacterial cells. It should also be possible to recover manganese SOD from genomic manganese superoxide dismutase DNA expressed in eucaryotic cells using similar methods. The invention further concerns uses of the human manganese superoxide dismutase, human manganese superoxide dismutase analogs or human manganese superoxide dismutase mutants, various new analogs, compositions of the compounds and methods of treating various disorders using these compositions.
摘要:
Sels de métaux lourds de l'acide hyaluronique et notamment sels d'argent, d'or, de cérium et de tungstène de l'acide hyaluronique. Ces sels de métaux lourds de l'acide hyaluronique sont utiles en tant qu'agents antimicrobiens. L'hyaluronate d'or peut également être utilisé pour traiter l'arthrite. L'invention se rapporte également à des procédés de production de sels d'argent de l'acide hyaluronique ainsi qu'à des compositions contenant l'hyaluronate d'argent ou l'hyaluronate d'or. L'invention se rapporte également à des sels de métaux lourds possédant des moitiés d'hyaluronates marquées radioactivement.
摘要:
Un nouveau microorganisme surtout, le Streptococcus zooepidemicus HA-116 ATCC 39920, produit de grandes quantités d'acide hyalyronique de poids moléculaire élevé. L'invention décrit un procédé permettant d'obtenir ces microorganismes, ainsi qu'un procédé de production d'hyaluronate de sodium consistant à cultiver sous agitation vigoureuse un microorganisme du genre Streptococcus dans des conditions et dans un milieu nutritif appropriés contenant un composant de sucre comme source de carbone. Le composant du sucre a une teneur sensiblement constante comprise entre 0,2 et 10 grammes par litre. Le milieu présente un pH sensiblement constant compris entre 6,0 et 7,5 et comprend une teneur en ions magnésium sensiblement constante et supérieure à 0,05 grammes par litre. L'hyaluronate de sodium excrété dans le milieu par l'organisme est purifié par des procédés consistant à précipiter, redissoudre et reprécipiter l'hyaluronate. On obtient ainsi des compositions à base d'hyaluronate de sodium caractérisées par l'absence de pyrogénicité et n'irritant pas la peau.