Method for biochemical analysis of dna and arrangement associated therewith
First Claim
1. A method for detecting DNA with use being made of a system employing immobilized DNAs as an analytical tool, comprising:
- fixing the enzyme in a stationary manner in the system which is used as an analytical tool and which contains a catcher DNA, an inhibitor and an enzyme, as biocatalytic label;
using the catcher DNA to permit, in a first inactive state of the system, the inhibitor and enzyme to interact;
forming, when the DNA to be analyzed is bound to the catcher DNA, a double strand due to the complementarity and at least one of abolishing and preventing the interaction between enzyme and inhibitor, wherein in this way, the system is switched from the first inactive state to a second, active state; and
measuring the signals of at least one of the active and inactive state via an electrochemically detectable substance whose concentration changes due to the enzyme activity.
2 Assignments
0 Petitions
Accused Products
Abstract
A system with immobilized DNA is used in the fields of medicine, environmentology or criminology as an analytical tool in the analysis of nucleic acid. The immobilized DNA is provided with a biocatalytically active marker, such as an enzyme, an with an inhibitor substance which reversibly inhibits catalytic activity, or in addition to the immobilized biocatalytic marker, the immobilized DNA is provided with a substance which can reversibly inhibit the catalytic activity of the marker. Alternatively, an immobilized biocatalytically active marker can be provided with DNA as a scavenger which includes a substance as an inhibitor which can reversibly inhibit the activity of the marker. In another alternative, it is possible to use a complex including a molecule binding double-stranded DNA and a substance as an inhibitor which can reversibly inhibit the activity of the marker by interacting with the immobilized biocatalytically active marker. In all cases, the inhibitor or compound including an inhibitor and a molecule which can bind double-stranded DNA interacts with the biocatalytically active marker and defines the inactive state of the system. When the DNA, which is to be analyzed, is bonded, especially hybridized, to the DNA scavengers, the interaction between the biocatalytically active marker and the inhibitor is cancelled as a result of the formation of the double strand. The system is thus shifted from a first state into a second state defining the active state. A carrier with integrated microelectrodes is provided in the associated device, whereby the enzyme is either immobilized therein or is contained in a polymer network in the vicinity of the microelectrodes.
-
Citations
32 Claims
-
1. A method for detecting DNA with use being made of a system employing immobilized DNAs as an analytical tool, comprising:
-
fixing the enzyme in a stationary manner in the system which is used as an analytical tool and which contains a catcher DNA, an inhibitor and an enzyme, as biocatalytic label;
using the catcher DNA to permit, in a first inactive state of the system, the inhibitor and enzyme to interact;
forming, when the DNA to be analyzed is bound to the catcher DNA, a double strand due to the complementarity and at least one of abolishing and preventing the interaction between enzyme and inhibitor, wherein in this way, the system is switched from the first inactive state to a second, active state; and
measuring the signals of at least one of the active and inactive state via an electrochemically detectable substance whose concentration changes due to the enzyme activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 28, 29, 30, 31)
-
-
10. The method as claimed in 1, wherein the switching function of the system is effected by the DNA to be analyzed hybridizing to the immobilized DNA, as catcher.
-
20. An arrangement, comprising:
-
a support on which an enzyme is immobilized at a site;
a catcher DNA which is immobilized at the site;
an inhibitor which is covalently linked to the catcher DNA and a substrate, with, in a first state, the catcher DNA being folded by way of intramolecular hydrogen bonds such that the inhibitor inhibits the activity of the enzyme and the substrate is not transformed, and with, in a second state, the catcher DNA hybridizing with a DNA to be detected and thereby being folded such that the inhibitor is separated from the enzyme and the substrate is transformed, wherein the support includes integrated microelectrodes, with the enzyme being at least one of immobilized on the support, and being at least one of enclosed and immobilized in a polymer network in the vicinity of the microelectrodes, and wherein at least one of the product and the substrate of the enzymic reaction is electrochemically detectable at the microelectrodes. - View Dependent Claims (21, 22, 23, 24, 25, 32)
-
-
26. (canceled)
-
27. (canceled)
Specification