摘要:
Modified signal peptides derived from wild-type signal peptides of the type that are capable of forming membrane-bound lipoproteins and methods for making such modified signal peptides and DNA sequences encoding them. Modified signal peptides of the invention and DNA sequences encoding them are useful for increasing the secretion of heterologous gene products produced by transformed host organisms. The invention further discloses a method for producing recombinant DNA sequences in vivo.
摘要:
Novel plasminogen activators are disclosed. Of the novel plasminogen activators, one is a modified urokinase that is altered to make it less susceptible to forming two chain-urokinase and to increase the fibrin specificity of urokinase. Also among the novel plasminogen activators are fibrinolytic proteins comprised of at least one domain capable of interacting with fibrin and the protease domain of urokinase. The domain capable of interacting with fibrin may have an amino acid sequences substantially the same as those of kringle-2 of t-PA, kringle-1 and/or -4 of plasminogen and the finger domain of t-PA. The protease domain may have an amino acid sequence substantially the same as that of 30 Kd urokinase. DNA sequences encoding the novel plasminogen activators, expression vectors and expression systems therefor are also disclosed and claimed.
摘要:
A biologically active reference (e.g. human) IL-2 (interleukin-2) protein is protected against oxidation by a method involving substituting a conservative amino acid for each methionine residue susceptible to chloramine T or peroxide oxidation and wherein additional, non-susceptible methionine residues are not so substituted.
摘要:
Novel plasminogen activators are disclosed. Of the novel plasminogen activators, one is a modified urokinase that is altered to make it less susceptible to forming two chain-urokinase and to increase the fibrin specificity of urokinase. Also among the novel plasminogen activators are fibrinolytic proteins comprised of at least one domain capable of interacting with fibrin and the protease domain of urokinase. The domain capable of interacting with fibrin may have an amino acid sequences substantially the same as those of kringle-2 of t-PA, kringle-1 and/or -4 of plasminogen and the finger domain of t-PA. The protease domain may have an amino acid sequence substantially the same as that of 30 Kd urokinase. DNA sequences encoding the novel plasminogen activators, expression vectors and expression systems therefor are also disclosed and claimed.
摘要:
Immunotoxins comprising a cytotoxic moiety and monoclonal antibodies which bind to human ovarian cancer tissue having at least one of the following capabilities are claimed: cytotoxic ID 50 of 10 nM or less against human ovarian cancer cells, retardation of human ovarian cancer tumor growth in mammals or extension of survival of a mammal carrying a human ovarian cancer tumor. Antigens to which the monoclonal antibody of the immunotoxin bind are identified and characterize the immunotoxins. Methods of killing human ovarian cancer cells, retarding the growth of human ovarian cancer tumors in mammals or extending the survival of mammals carrying human ovarian cancer tumors are claimed.
摘要:
Antibodies exhibit specificity toward single amino acid differences between proteins. These antibodies may be produced by synthesizing a peptide of the appropriate amino acid sequence contained in the protein, immunizing a host with the peptide, and extracting sera from the host to obtain the antibodies. The antibodies and the desired protein are then immunoprecipiated under conditions of partial denaturation to expose the epitope of the protein. The antibodies may be used for diagnostic or therapeutic purposes.
摘要:
Anti-tumor activity in mammals can be augmented by administering to the mammalian host a synergistically effective amount of TNF and IL-2 or of TNF and IFN-β, or of TNF, IL-2 and IFN-β in combination. The composition of TNF and IL-2 and/or IFN-p may be prepared in vitro or administered separately to the host. If the TNF and IL-2 are administered sequentially, the TNF must be administered prior to the IL-2 to obtain synergy. The composition is useful for treating such cancers as mastocytoma, melanoma, leukemia, and lymphoma.