ATP

ATP
Name	Adenosine triphosphate
Formula	C10H16N5O13P3
Molar mass	507.18 g·mol−1
Melting point	Decomposes

ATP Adenosine triphosphate is a nucleotide that serves as the primary short-term energy carrier in many cells, participating in metabolism, signaling, and macromolecular synthesis. It consists of an adenine base, a ribose sugar, and three phosphate groups and is produced and consumed across diverse pathways in organisms from Escherichia coli to Homo sapiens. Its high-energy phosphate bonds link biochemical processes in organelles such as the Mitochondrion and Chloroplast and are central to functions studied by researchers at institutions like the National Institutes of Health and the Max Planck Society.

Structure and chemical properties

The molecule comprises an adenine moiety derived from purine biosynthesis pathways characterized in studies by Arthur Kornberg and colleagues, attached to a ribofuranose and a triphosphate chain similar to intermediates in work by Robert Burns Woodward. The distal phosphoanhydride bonds exhibit high standard free energy change on hydrolysis, a property exploited in enzymology investigations at the Cold Spring Harbor Laboratory and the European Molecular Biology Laboratory. Its protonation state and metal coordination, notably with Magnesium ions as observed in crystallographic studies from the Protein Data Bank, influence binding to enzymes such as kinases characterized by groups at the European Bioinformatics Institute. The molecule's UV absorbance and chromatographic behavior were elucidated in analytical chemistry research at the American Chemical Society meetings.

Biosynthesis and cellular production

Biosynthetic routes include phosphorylation of adenosine diphosphate catalyzed by oxidative phosphorylation complexes in the inner membrane of the Mitochondrion, mechanisms described in classical work from the Max Planck Institute for Biophysical Chemistry and models proposed by Peter Mitchell. Substrate-level phosphorylation occurs during glycolysis enzymes studied by Otto Meyerhof and in the tricarboxylic acid cycle characterized by Hans Krebs. Photophosphorylation in Chloroplast thylakoid membranes drives synthesis during photosynthesis described by researchers at the Royal Society and the Carnegie Institution for Science. Salvage pathways, involving enzymes analyzed by groups at the University of Cambridge and the Massachusetts Institute of Technology, recycle adenine derivatives to maintain nucleotide pools.

Role in cellular metabolism and energy transfer

The nucleotide functions as a phosphoryl donor in reactions catalyzed by protein kinases such as those identified in cancer research at Memorial Sloan Kettering Cancer Center and by metabolic enzymes in studies from the Salk Institute. It couples exergonic and endergonic reactions in processes studied by investigators at the European Molecular Biology Organization and supports mechanical work by motor proteins like Myosin and Kinesin, elucidated in structural studies from the Royal Institution. In photosynthetic organisms studied at the John Innes Centre, it links light-driven electron transport to biosynthesis, while in anaerobes such as members of the Clostridium genus substrate-level processes predominate.

Regulation and signaling functions

Beyond bioenergetics, adenine nucleotides regulate ion channels characterized by the Nobel Prize-winning work on membrane proteins and modulate signaling cascades mediated by kinases and phosphatases examined at the Howard Hughes Medical Institute. Changes in nucleotide concentration influence AMP-activated protein kinase activity, a regulatory axis investigated by teams at University College London and Harvard University Medical School. Extracellular conversion to nucleoside ligands engages purinergic receptors mapped by researchers at the Pasteur Institute and implicated in inflammation studied by groups at the World Health Organization and the Centers for Disease Control and Prevention.

Clinical significance and disease associations

Dysregulation of nucleotide metabolism contributes to inherited disorders identified by clinicians at the Mayo Clinic and geneticists collaborating with the Wellcome Trust. Mitochondrial dysfunction affecting oxidative phosphorylation is central to diseases described in case series from the Johns Hopkins Hospital and metabolic syndromes researched at the National Institute of Diabetes and Digestive and Kidney Diseases. Altered kinase signaling involving phosphoryl transfer is a hallmark of many cancers profiled by the American Association for Cancer Research and targeted by therapeutics developed by pharmaceutical companies such as Pfizer and Roche. Purinergic signaling abnormalities are implicated in neurological conditions investigated at the Neuroscience Research Australia and autoimmunity studied at the Karolinska Institutet.

Measurement and experimental methods

Quantification methods include luciferase-based bioluminescence assays originally refined at the Marine Biological Laboratory and chromatographic separation coupled to mass spectrometry standardized in laboratories at the European Molecular Biology Laboratory. Nuclear magnetic resonance spectroscopy used by teams at the Max Planck Institute for Biophysical Chemistry permits structural and dynamic studies, while crystallography at facilities such as the Diamond Light Source reveals enzyme–nucleotide complexes. In vivo imaging approaches using genetically encoded sensors were developed by groups at the Broad Institute and the Massachusetts General Hospital, enabling real-time monitoring in model organisms maintained at repositories like the Jackson Laboratory.

Category:Nucleotides