摘要:
The present invention relates to the visualization of acidic organelles based upon organelle enzyme activity. The organelle substrates of the invention are specific for enzyme activity of the organelle and label these organelles, such as lysosomes, rendering them visible and easily observed. Substrates of the present invention include substrates that produce a fluorescent signal. The fluorogenic acidic organelle enzyme substrates of this invention are designed to provide high fluorescence at low pH values and are derivatized to permit membrane permeation through both outer and organelle membranes of intact cells and can be used for staining cells at very low concentrations. They can be used for monitoring enzyme activity in cells at very low concentrations and are not toxic to living cells or tissues.
摘要:
A codon optimized and stabilized luciferase gene based upon the sequence of the natural luciferase gene isolated from Luciola cruciata (Japanese firefly) and a novel recombinant DNA characterized by incorporating this new gene coding for a novel luciferase into a vector DNA for improved activities in mammalian cells, are disclosed. This new luciferase exhibits long-wavelength light emission, as well as improved thermostability and higher expression levels in mammalian cell systems, compared to native luciferase. Assays using this new enzyme for measuring various biological metabolic functions are described.
摘要:
A codon optimized and stabilized luciferase gene based upon the sequence of the natural luciferase gene isolated from Luciola cruciata (Japanese firefly) and a novel recombinant DNA characterized by incorporating this new gene coding for a novel luciferase into a vector DNA for improved activities in mammalian cells, are disclosed. This new luciferase exhibits long-wavelength light emission, as well as improved thermostability and higher expression levels in mammalian cell systems, compared to native luciferase.
摘要:
Triterpenoid acid derivatives have been found to have structures similar to natural ligands to the extent that these derivatives bind to natural selectin receptors including endothelial leukocyte adhesion molecule-1 (ELAM-1) and leukocyte/endothelial cell adhesion molecule-1 (LECAM-1). The molecules can be administered to the patients by themselves or in pharmaceutical formulations in order to alleviate inflammation and/or treat other abnormalities associated with the excessive binding of leukocytes to endothelial receptors.
摘要:
The subject invention provides a method for analyzing the metabolic activity in cells by improving the retention of a detectable reporter molecule only in intact cells where a particular enzyme is present. In particular, improved retention results from a two part process involving conjugation of haloalkyl-substituted derivatives of a reporter molecule with intracellular cysteine-containing peptides while unblocking the reporter molecule. The method for analyzing metabolic activity of cells involves the use of a substrate having the formXR-REPORTER-BLOCKwherein -BLOCK is a group selected to be removable by action of a specific analyte, to give REPORTER spectral properties different from those of the substrate,-REPORTER- is a molecule that, when no longer bound to BLOCK by a BLOCK-REPORTER bond, has spectral properities different from those of the substrate, andXR-- is a haloalkyl moiety that can covalently react with an intracellular thiol (Z--S--H) to form a thioether conjugate (Z--S--R--).After the substrate enters the cells, the analyte removes BLOCK to make REPORTER detectable by the change in spectral properties, and the haloalkyl XR reacts with the intracellular thiol to form the thioether conjugate inside the cells, which is well-retained in the cells.
摘要:
A codon optimized and stabilized luciferase gene based upon the sequence of the natural luciferase gene isolated from Luciola cruciata (Japanese firefly) and a novel recombinant DNA characterized by incorporating this new gene coding for a novel luciferase into a vector DNA for improved activities in mammalian cells, are disclosed. This new luciferase exhibits long-wavelength light emission, as well as improved thermostability and higher expression levels in mammalian cell systems, compared to native luciferase.
摘要:
Triterpenoid acid derivatives have been found to have structures similar to natural ligands to the extent that these derivatives bind to natural selectin receptors including endothelial leukocyte adhesion molecule-1 (ELAM-1) and leukocyte/endothelial cell adhesion molecule-1 (LECAM-1). The molecules can be administered to the patients by themselves or in pharmaceutical formulations; in order to alleviate inflammation and/or treat other abnormalities associated with the excessive binding of leukocytes to endothelial receptors.
摘要:
The claimed invention relates to a substrate for evaluating glycosidic enzymes comprising a resorufin derivative of the general formula: ##STR1## wherein Gly is a carbohydrate bonded to resorufin by a glycosidic linkage; where at least one of substituents R.sub.1, R.sub.2, R.sub.4, R.sub.6, R.sub.8, and R.sub.9 is a lipophilic residue of the formula --L(CH.sub.2).sub.n CH.sub.3, where n is greater than 3 and less than 22, and where L is a methylene --CH.sub.2 --, an amide --NHCO--, a sulfonamide --NHSO.sub.2 --, a carboxamide --CONH--, a carboxylate ester --COO--, a urethane --NHCOO--, a urea --NHCONH--, or a thiourea --NHCSNH--; andwhere the remainder of substituents R.sub.1, R.sub.2, R.sub.4, R.sub.6, R.sub.8, and R.sub.9, which may be the same or different, are hydrogen, halogen, or other lipophilic residues, which may be the same or different, containing from about 1 to about 22 carbon atoms of the formula --L'(CH.sub.2).sub.m CH.sub.3, where m is less than 22, and where L' is a methylene --CH.sub.2 --, an amide --NHCO--, a sulfonamide --NHSO.sub.2 --, a carboxamide --CONH--, a carboxylate ester --COO--, a urethane --NHCOO--, a urea --NHCONH--, or a thiourea --NHCSNH--.A preferred embodiment of the invention is a non-fluorescent substrate specifically hydrolyzable by a glycosidase inside a cell to yield, after greater than about 2 minutes, an orange to red fluorescent detection product which is retained inside a viable cell more than about 2 hours at greater than about 15.degree. C. and which is non-toxic to the cell. The substrates are used for evaluating a glycosidic enzyme in living plant or animal cells whether the enzyme is present endogenously; present as a result of manipulation of the cell's genome, or added to the cell exogenously, such as by covalently binding the enzyme to a protein to form an enzyme-protein complex that enters the cell.
摘要:
The present invention provides systems and methods for production of activatable diazo-derivatives for use in labeling nucleotides. Labeling nucleotides is accomplished by contacting a stable hydrazide derivative of a detectable moiety with an activating polymer reagent which is used to directly label the nucleotide sample. Labeling occurs on the phosphate backbone of the nucleotide which does not perturb hybridization of the labeled nucleotide with its anti-sense strand. Since the method involves direct labeling, all types of nucleotides can be labeled without prior amplification or alteration.
摘要:
The present invention relates to the visualization of acidic organelles based upon organelle enzyme activity. The organelle substrates of the invention are specific for enzyme activity of the organelle and label these organelles, such as lysosomes, rendering them visible and easily observed. Substrates of the present invention include substrates that produce a fluorescent signal. The fluorogenic acidic organelle enzyme substrates of this invention are designed to provide high fluorescence at low pH values and are derivatized to permit membrane permeation through both outer and organelle membranes of intact cells and can be used for staining cells at very low concentrations. They can be used for monitoring enzyme activity in cells at very low concentrations and are not toxic to living cells or tissues.