Navigation Links
Adenosine triphosphate


For other uses of the initials ATP, see ATP (disambiguation)


Adenosine triphosphate (ATP) is the nucleotide known in biochemistry as the "molecular currency" of intracellular energy transfer; that is, ATP is able to store and transport chemical energy within cells. ATP also plays an important role in the synthesis of nucleic acids. ATP molecules are also used to store the energy plants make in cellular respiration.

Contents

Chemical properties

Chemically, ATP consists of adenosine and three phosphate groups. It has the empirical formula C10H16N5O13P3, and the chemical formula C10H8N4O2NH2(OH)2(PO3H)3H, with a molecular mass of 507.184 u. The phosphoryl groups starting with that on AMP are referred to as the alpha, beta, and gamma phosphates. The biochemical name for ATP is 9--D-ribofuranosyladenine-5'-triphosphate.

Synthesis

ATP can be produced by various cellular processes, most typically in mitochondria by oxidative phosphorylation under the catalytic influence of ATP synthase or in the case of plants in chloroplasts by photosynthesis. The main fuels for ATP synthesis are glucose and fatty acids. Initially glucose is broken down into pyruvate in the cytosol. Two molecules of ATP are generated for each molecule of glucose. The terminal stages of ATP synthesis are carried out in the mitochondrion and can generate up to 36 ATP.

ATP in the human body

The total quantity of ATP in the human body is about 0.1 mole. The energy used by human cells requires the hydrolysis of 200 to 300 moles of ATP daily. This means that each ATP molecule is recycled 2000 to 3000 times during a single day. ATP cannot be stored, hence its synthesis must closely follow its consumption.

Other triphosphates

Living cells also have other "high-energy" nucleoside triphosphates, such as guanosine triphosphate. Between them and ATP, energy can be easily transferred with reactions such as those catalyzed by nucleoside diphosphokinase : Energy is released when hydrolysis of the phosphate-phosphate bonds is carried out. This energy can be used by a variety of enzymes, motor proteins , and transport proteins to carry out the work of the cell. Also, the hydrolysis yields free inorganic phosphate and adenosine diphosphate, which can be broken down further to another phosphate ion and adenosine monophosphate. ATP can also be broken down to adenosine monophosphate directly, with the formation of pyrophosphate. This last reaction has the advantage of being an effectively irreversible process in aqueous solution.

Reaction of ADP with GTP

ADP + GTP ATP + GDP

There is talk of using ATP as a power source for nanotechnology and implants. Artificial pacemakers could become independent of batteries.

See also

External link


'"/>


(Date:4/17/2014)... Marc Andr Gauthier and Professor Luca Razzari of ... been awarded large grants from the John R. ... Innovation (CFI) for the acquisition of state-of-the-art biotech ... added matching grants from the Ministre de l,Enseignement ... de la Technologie (MESRST). These new laboratories will ...
(Date:4/17/2014)... hydrogen sulfide in order to properly multiply and form ... Center for Craniofacial Molecular Biology at the Herman Ostrow ... principal investigator on the project, said the presence of ... of calcium ions. The essential ions activate a chain ... creation of new bone tissue, and keeps the breakdown ...
(Date:4/17/2014)... the Amazon help create tinderbox conditions for wildfires ... forest loss during drought years, according to a ... in the Amazon could reach a "tipping point" ... to large-scale loss of trees, making recovery more ... Penn State. , "We documented one of the ...
Breaking Biology News(10 mins):New state-of-the-art biotech and nanotech equipment for INRS 2Drought and fire in the Amazon lead to sharp increases in forest tree mortality 2Drought and fire in the Amazon lead to sharp increases in forest tree mortality 3
... Oklahoma Medical Research Foundation, has found a way to reverse ... important implications for the treatment of cancer, birth defects and ... April 13 issue of the journal Nature. , "No one ... said Gorbsky, who holds the W.H. and Betty Phelps Chair ...
... up to 80 percent of cases, according to a ... pairs. , The study appears in the February 2006 ... the American Medical Association. , Margaret Gatz, professor of ... Sciences, led an international team of researchers from Göteborg ...
... An expedition to one of Asia's most isolated jungles ... ?discovered a virtual ''Lost World" of new species, giant ... , The December 2005 trip by a team of ... (CI) found dozens of new species including frogs, butterflies, ...
Cached Biology News:Rewind, please: Nature paper shows that cell division is reversible 2Alzheimer's found to be mostly genetic 2Scientists discover dozens of new species in 'Lost World' of western New Guinea 2
Other biology definitionOther Tags