Radioactive Atp
Radioactive Atp - Related Videos
01:31
ATP Yield
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2019
Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle). The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
03:18
Radioactivity and Nuclear Equations
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2020
Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element. A nuclide of an element has a specific number of protons and...
08:32
The ATP Bioluminescence Assay
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2023
In fireflies, the luciferase enzyme converts a compound called luciferin into oxyluciferin, and produces light or “luminescence” as a result. This reaction requires energy derived from ATP in order to proceed, so researchers have exploited the luciferase-luciferin interaction to gauge ATP levels in cells. Given ATP’s role as the cell’s currency of energy, the ATP bioluminescence assay can provide insight into cellular metabolism and overall cell health.In this video, JoVE discusses cellular...
01:08
Hydrolysis of ATP
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2019
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids. If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
02:48
Radioactive Decay and Radiometric Dating
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2020
Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time. The SI unit for activity is the becquerel, which is one disintegration per second. Another unit of activity is the...
FAQs
Radioactive ATP produces interpretable signals because the isotope follows the nucleotide through a reaction. When an enzyme transfers ATP’s phosphate group, the label becomes associated with the reaction product. If ATP is bound without phosphate transfer, the label remains associated with the ATP molecule. This distinction helps investigators separate chemical use of ATP from nucleotide binding or molecular interaction.
Tracking the labeled phosphate allows researchers to determine whether a kinase has transferred phosphate from ATP during phosphorylation. Radiation-sensitive measurements can then reveal substrate conversion and reaction rates rather than only showing that ATP was present. This makes the label useful for examining how efficiently phosphorylation occurs and how enzymatic activity changes under investigated biological conditions.
The label can provide information about reaction products, substrate conversion, and interactions involving ATP. Because researchers can follow whether radioactivity remains with ATP or becomes associated with a product, measurements can connect nucleotide use with a specific enzymatic event. These observations help clarify how ATP-dependent reactions contribute to regulated cellular processes.
A typical conceptual workflow connects labeled ATP with the enzyme, substrate, or molecular system being investigated, allows the relevant ATP-dependent process to occur, and then uses radiation-sensitive measurements to assess the label. Researchers interpret whether radioactivity remains associated with ATP or appears with reaction products. The resulting signal can indicate substrate conversion, reaction rate, or molecular interaction.
In kinase assays, radioactive ATP makes phosphate transfer measurable when a kinase phosphorylates a substrate. The resulting radioactive signal can be used to evaluate substrate conversion and estimate the reaction’s progress or rate. In phosphorylation studies, this approach helps connect enzyme activity with regulation of cellular targets, providing a way to investigate ATP-dependent signaling mechanisms.
Studies using radioactive ATP can examine energy metabolism as well as ATP-dependent signaling, transport, and movement. By measuring reaction rates, substrate conversion, or molecular interactions, researchers can relate ATP use to these broader cellular activities. The method therefore contributes to understanding how cells regulate processes that depend on ATP rather than treating energy use as an isolated reaction.