摘要:
A chimeric toxin comprising protein fragments joined together by peptide bonds, the chimeric toxin comprising, in sequential order, beginning at the amino terminal end of the chimeric toxin, (a) the enzymatically active Fragment A of diphtheria toxin, (b) a first fragment including the cleavage domain 1.sub.1 adjacent the Fragment A of diphtheria toxin, (c) a second fragment comprising at least a portion of the hydrophobic transmembrane region of Fragment B of diphtheria toxin, the second fragment having a deletion of at least 50 diphtheria toxin amino acid residues, the deletion being C-terminal to the portion of the transmembrane region, and the second fragment not including domain 1.sub.2, and (d) a third fragment comprising a portion of a cell-specific polypeptide ligand, the portion including at least a portion of the binding domain of the polypeptide ligand, the portion of the binding domain being effective to cause the chimeric toxin to bind selectively to a predetermined class of cells to be attacked by the enzymatically active Fragment A.
摘要:
Disclosed is a recombinant DNA molecule encoding a hybrid protein comprising a first part, a second part, and a third part,(a) wherein said first part comprises a portion of the binding domain of a cell-binding polypeptide ligand effective to cause said hybrid protein to bind to a cell of an animal;(b) wherein said second part comprises a portion of a translocation domain of naturally occurring protein selected from the group consisting of diphtheria toxin, botulinum neurotoxin, ricin, cholera toxin, LT toxin, C3 toxin, Shiga toxin, Shiga-like toxin, pertussis toxin and tetanus toxin, which translocates said third part across the cytoplasmic membrane into the cytosol of the cell; and(c) wherein said third part comprises a polypeptide entity to be introduced into the cell, wherein said third part is non-native with respect to said naturally occurring protein of (b).
摘要:
Polyhydroxybutadiene compounds are storage stabilized against reactivity changes by incorporating therein an effective amount of a di or triphenyl phosphine compound of the formula ##STR1## wherein each x is hydrogen, a halogen or an alkyl or alkoxy group having from 1 to 10 carbon atoms and y is an alkyl group having from 1 to 10 carbon atoms or an aryl group which may be substituted with a halogen or an alkyl or alkoxy group having from 1 to 10 carbon atoms.
摘要:
Polyether-ester polyols are prepared in the presence of from 0.005 percent to 0.01 percent by weight (50-100 ppm) of a trialkylamine. The resulting polyols have improved color and are obtained in markedly reduced reaction times.
摘要:
An oil-operated motor driven from an air-pressurized oil supply tank. The motor has sets of opposing cylinders having oil admission valves and containing drive pistons connected to a crankshaft. The cylinders are connected to the pressurized supply tank through the admission valves and respective ones of a pair of compressed air-controlled pilot valves. The pilot valves are controlled by relay valves alternately opened by a rotating cam driven by the crankshaft. The pilot valves control the delivery of pressurized oil to cylinders arranged to be alternately supplied with pressurized oil, with their pistons acting to drive the crankshaft in a common direction by alternate power pulsations. A common compressed air supply is employed to pressurize the oil reservoir and to operate the pilot valves. The exhaust oil from the motor is returned to the oil reservoir by a hydraulic pump driven by the main oil-operated motor.
摘要:
The invention features methods for identifying compounds that inhibit cell death, and methods for identifying compounds that promote cell death, by blocking or accelerating, respectively, the translocation of the catalytic domain of toxins or transcription factors through the endosomal membrane into the cytosol of a cell. Also featured are methods for inhibiting cell death that include the administration of polypeptides that include a toxin consensus sequence recognized by one or more components of the cytosolic translocation factor complex.
摘要:
The invention features methods for identifying compounds that inhibit cell death, and methods for identifying compounds that promote cell death, by blocking or accelerating, respectively, the translocation of the catalytic domain of toxins or transcription factors through the endosomal membrane into the cytosol of a cell. Also featured are methods for inhibiting cell death that include the administration of polypeptides that include a toxin consensus sequence recognized by one or more components of the cytosolic translocation factor complex.
摘要:
Disclosed is a hybrid molecule comprising a first part, a second part, and a third part connected by covalent bonds,(a) wherein said first part comprises a portion of the binding domain of a cell-binding polypeptide ligand effective to cause said hybrid protein to bind to a cell of an animal;(b) wherein said second part comprises a portion of a translocation domain of naturally occurring protein which translocates said third part across the cytoplasmic membrane into the cytosol of the cell; and(c) wherein said third part comprises a chemical entity to be introduced into the cell, wherein each of said first part and said third part is non-native with respect to said naturally occurring protein, and further wherein said covalent bond connecting said second part and said third part is a cleavable bond, provided that when said second part comprises a portion of a translocation domain of Pseudomonas exotoxin, said third part is not a polypeptide.
摘要:
A hybrid molecule including a first part and a second part connected by a covalent bond,(a) the first part including a portion of the binding domain of a cell-binding ligand, which portion is able to cause the hybrid molecule of the invention to bind to an animal cell; and(b) the second part including a portion of a translocation domain of a protein, provided that (i) the hybrid molecule does not include an enzymatically-active portion of the protein, (ii) the first part and the second part are not segments of the same naturally-occurring polypeptide toxin, and (iii) the portion of the translocation domain, when covalently bonded to the enzymatically-active effector region of a toxin selected from diphtheria toxin, Pseudomonas exotoxin A, cholera toxin, ricin toxin, and Shiga-like toxin, is capable of translocating such effector region across the cytoplasmic membrane of the cell.
摘要:
A hybrid protein toxic to cells having linear neuropeptide receptors such as TRH receptors comprising a linear neuropeptide such as TRH covalently bonded to CRM 45 is useful for treatment of tumors.