adenosine triphosphate

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adenosine triphosphate

(ATP) (ədĕn`əsēn trī'fŏs`fāt), organic compound composed of adenineadenine
, organic base of the purine family. Adenine combines with the sugar ribose to form adenosine, which in turn can be bonded with from one to three phosphoric acid units, yielding the three nucleotides adenosine monophosphate, adenosine diphosphate, and adenosine
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, the sugar riboseribose
, monosaccharide carbohydrate of universal distribution in living tissue, found in ribonucleic acid (RNA; see nucleic acid), free nucleotides, and various coenzymes.
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, and three phosphate groups. ATP serves as the major energy source within the cell to drive a number of biological processes such as photosynthesis, muscle contraction, and the synthesis of proteins. It is broken down by hydrolysis to yield adenosine diphosphate (ADP), inorganic phosphorus, and energy. ADP can be further broken down to yield adenosine monophosphateadenosine monophosphate
(AMP) , organic compound composed of an adenine base, the sugar ribose, and one phosphate unit. AMP is one of the possible products of the hydrolysis of adenosine triphosphate (ATP) and is therefore important in the transfer of chemical energy during
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 (AMP), additional phosphorus, and more energy. When the phosphorus and energy are immediately used to drive other reactions, such as the synthesis of uridine diphosphate (UDP), an RNA precursor, from uridine monophosphate (UMP), the pair of reactions are said to be coupled. New ATP is produced from AMP using the energy released from the breakdown of fuel molecules, such as fats and sugars.

Extracellularly, ATP has been found to act as a neurotransmitterneurotransmitter,
chemical that transmits information across the junction (synapse) that separates one nerve cell (neuron) from another nerve cell or a muscle. Neurotransmitters are stored in the nerve cell's bulbous end (axon).
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. ATP receptors are widespread through the body. On its own it is known to have effects in the arteries, intestines, lungs, and bladder. It is also often released in tandem with other neurotransmitters, perhaps to add chemical stability. See phosphorylationphosphorylation,
chemical process in which a phosphate group is added to an organic molecule. In living cells phosphorylation is associated with respiration, which takes place in the cell's mitochondria, and photosynthesis, which takes place in the chloroplasts.
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Adenosine triphosphate (ATP)

A coenzyme and one of the most important compounds in the metabolism of all organisms, since it serves as a coupling agent between different enzymatic reactions. Adenosine triphosphate is adenosine diphosphate (ADP) with an additional phosphate group attached through a pyrophosphate linkage to the terminal phosphate group (see illustration). ATP is a powerful donor of phosphate groups to suitable acceptors because of the pyrophosphate nature of the bonds between its three phosphate radicals. For instance, in the phosphorylation of glucose, which is an essential reaction in carbohydrate metabolism, the enzyme hexokinase catalyzes the transfer of the terminal phosphate group.

Structure of adenylic acid and phosphate derivatives ADP and ATPenlarge picture
Structure of adenylic acid and phosphate derivatives ADP and ATP

ATP serves as the immediate source of energy for the mechanical work performed by muscle. In its presence, the muscle protein actomyosin contracts with the formation of adenosine diphosphate and inorganic phosphate. ATP is also involved in the activation of amino acids, a necessary step in the synthesis of protein. See Muscle

In metabolism, ATP is generated from adenosine diphosphate and inorganic phosphate mainly as a consequence of energy-yielding oxidation-reduction reactions. In respiration, ATP is generated during the transport of electrons from the substrate to oxygen via the cytochrome system. In photosynthetic organisms, ATP is generated as a result of photochemical reactions. See Carbohydrate metabolism, Cytochrome

By virtue of its energy-rich pyrophosphate bonds, ATP serves as a link between sources of energy available to a living system and the chemical and mechanical work which is associated with growth, reproduction, and maintenance of living substance. For this reason, it has been referred to as the storehouse of energy of living systems. Because ATP, ADP, and adenylic acid are constantly interconverted through participation in various metabolic processes, they act as coenzymes for the coupled reactions in which they function. See Biochemistry, Coenzyme, Metabolism

adenosine triphosphate

[ə¦dēn·ə‚sēn ‚tri·′fäs‚fāt]
C10H16N5O12P3 A coenzyme composed of adenosine diphosphate with an additional phosphate group; an important energy compound in metabolism. Abbreviated ATP.
References in periodicals archive ?
Mitochondria: Structures within cells that generate most of the cells' energy through the production of adenosine triphosphate (ATP).
(*) Adenosine triphosphate (ATP) is a molecule that supplies energy to cells for process like muscle contraction and sugar metabolism.
Creatine serves as a reservoir to replenish adenosine triphosphate (ATP), a substance involved in energy production.
He became the first Japanese to receive the grand prize for his discovering of the rotation of adenosine triphsphatase (ATPase), an enzyme that catalyzes the hydrolysis of adenosine triphosphate (ATP), which is an important energy compound in metabolism.
The most versatile of the high-energy configurations is a compound called adenosine triphosphate (ATP), each molecule of which contains two high-energy phosphates and which has been found to be concerned with body chemistry at almost every point where energy is required.
Kinase is a class of enzyme that helps to transfer phosphate groups to the targeted substrate from molecules with high energy such as adenosine triphosphate (ADP).
Summary: Kinase is a class of enzyme that helps to transfer phosphate groups to the targeted substrate from molecules with high energy such as adenosine triphosphate (ADP).
According to the company, Onvansertib is a first-in-class, third generation, oral and highly-selective adenosine triphosphate (ATP) competitive inhibitor of the serine/threonine polo-like-kinase 1 (PLK 1) enzyme, which is over-expressed in multiple cancers, including leukemias, lymphomas and solid tumors.
For their research, the scientists extracted microtubules from the brain tissue of cows, and mixed them kinesin - a protein that attaches to the microtubules - and adenosine triphosphate (ATP) - often called the "molecular unit of currency" of intracellular energy transfer.
In both cases, results confirmed that orally supplemented adenosine triphosphate (ATP) stimulates vasodilation following exercise.
Additionally, it is a well known fact that creatine helps to build muscle by regulating the ATP (Adenosine Triphosphate) and ADP (Adenosine Diphosphate) ratio during workouts so it is definitely something to be considered by persons who are into body building and fitness.

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