摘要:
A novel translational activating sequence is disclosed, said translational activating sequence having an oligonucleotide sequence comprising : Recombinant DNA vectors comprising the novel translational activating sequence and utilities thereof are also disclosed.
摘要:
A novel translational activating sequence is disclosed, said translational activating sequence having an oligonucleotide sequence comprising : Recombinant DNA vectors comprising the novel translational activating sequence and utilities thereof are also disclosed.
摘要:
The present invention concerns novel DNA compounds which function as transcriptional activating sequences. Recombinant DNA expression vectors which contain the transcriptional activating sequences and host cells transformed with these expression vectors are also provided. When properly positioned in an expression vector, the novel transcriptional activating sequences enable regulatable expression of an operably linked gene and enhance the structural stability of the expression vector.
摘要:
Stabilized human prourokinase-like polypeptides wherein the 135th lysine from the N-terminal of human prourokinase is substituted by an amino acid other than basic amino acids, the 157th phenylalanine is substituted by an acidic amino acid, or both of the amino acids are substituted as described above; DNA segment which codes said polypeptides; plasmid which contains said DNA segment; E. coli transformed by said plasmid; and a process for preparing said polypeptide by using said E. coli. The polypeptides are stable against proteases such as plasmin, thrombin, trypsin, etc., thus being easily purified and collected in a pure form. When applied to a living body, the polypeptides are expected to provide a persistent fibrinolytic activity.
摘要:
(57) The invention provides 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 a functional polypeptide gene under the control of the Escherichia coli bacteriophage λp L promoter.
摘要:
An improved vector which upon introduction into a suitable host containing the thermolabile repressor C 1 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 ci 434 which includes the gene for the cl 343 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 T,T 2 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 ana- loges thereof In host cells. Such superoxide dismutase or analogs thereof may be used to catalyze the reduction of superoxide radicais, 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 2 ppm. . The invention also concerns improved methods of ro- covering purified enzymatically active eucaryotic superoxide dismutase or analogs thereof.
摘要:
The DNA of a novel bacteriophage is characterized in that (1) in the upstream portion from the late promoter necessary for the transcription of genetic information for the biosynthesis of coat proteins up to the cohesive end, there is no endonuclease cleavage site or there are endonuclease cleavage sites permissible in number for the reconstruction of a DNA molecule when the DNA is cleaved with endonuclease into fragments and then these fragments are rejoined with DNA ligase, and (2) in the downstream portion from the late promoter down to the cohesive end, there is one or more endonuclease cleavage sites.
摘要:
Improved vectors and methods for expressing cloned genes of prokaryotic or eukaryotic origin and methods of making such vectors are disclosed, the improved vectors comprising promoters and operators from λ phages and preferably do not include an active cro gene or an active N gene, the vectors having at least one endonuclease recognition site forcloning desired genes less than about 300 base pairs from the promoters and operators and being useful, as are methods utilizing the vectors, in producing a wide variety of prokaryotic, eukaryotic and viral polypeptides, hormones, enzymes, antigens, proteins and amino acids.