Adenosine
: a purine nucleoside composed of adenine linked by its N9
nitrogen to the C1 carbon of ribose. It is a component of ribonucleic acid and
its nucleotides (AMP., ADP, ATP, cAMP) play important roles in biochemical
processes such as synthesis of nucleic acids and proteins, photosynthesis,
muscle contraction and intracellular signal transduction (cAMP). AMP., ADP, ATP
are three interconvertible compounds in which adenosine is attached through its
ribose group to one (monophosphate), two (diphosphate), and three (triphosphate)
phosphoric acid molecules.
Adenosine Triphosphate (ATP)
: a nucleotide
composed of adenine, the sugar ribose, and three phosphate groups; involved in
energy metabolism and required for RNA synthesis. It exists in cells in a form
of high-energy phosphate bond to store and transport chemical energy. The
pyrophosphate nature of the bonds between ATP's three phosphate radicals results
in a powerful donor of phosphate groups to suitable acceptors. When it is broken
down by hydrolysis, it yields ADP (adenosine diphosphate), inorganic phosphorus,
and energy. The free energy derived from hydrolysis of ATP is used to drive
metabolic reactions including the synthesis of nucleic acids and proteins, to
move molecules against concentration gradients (active transport), and to
produce mechanical motion (contraction of microfibrils and microtubules). ADP
can be further broken down to yield adenosine monophosphate (AMP), additional
phosphorus, and more energy. When the phosphorus and energy are immediately used
to drive other reactions, such as the synthesis of UDP (uridine diphosphate), an
RNA precursor, from UMP (uridine monophosphate), 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 fat and glucose which is broken down into
pyruvate in the cytosol. Two molecules of ATP are generated for each molecule of
glucose. ADT can be converted back to ATP by the processes of oxidative
phosphorylation and substrate-level phosphorylation.
Adenosine
Diphosphate (ADP) : a nucleotide composed of pyrophosphate of adenosine, involved
in energy metabolism; it is produced by hydrolysis of ATP and converted back to
ATP by the processes of oxidative phosphorylation and substrate-level
phosphorylation.
Adenosine Monophosphate (AMP, also called adenylic
acid.) : a nucleotide, 5'-phosphate of adenosine, produced by the hydrolysis of
ATP and converted to ADP by adenylate kinase. Involved in the reactions of
intracellular energy transfers.
Cyclic Adenosine Monophosphate (cAMP)
: cyclic AMP containing an
additional ester linkage between the phosphate and ribose units; serves as an
intracellular and, in some cases, extracellular secondary messenger mediating
the action of many peptide or amine hormones. It also plays a role in the
transcription of some genes.
Deoxyadenosine (dA) : a purine nucleoside composed of adenine linked by its N9
nitrogen to the C1 carbon of deoxyribose. (deoxy-, also called desoxy, is a prefix for the designation of
compounds which contain one less atom of oxygen than the reference substance).
Deoxyadenosine diphosphate (dADP)
: a nucleotide, 5'-pyrophosphate of deoxyadenosine.
Deoxyadenosine
monophosphate (dAMP) : a nucleotide, 5¢-phosphate of deoxyadenosine, occurring
in deoxyribonucleic acid.
Deoxyadenosine triphosphate (dATP): a nucleotide,
the 5'-triphosphate of deoxyadenosine; activated precursor in DNA
synthesis.
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