Epinephrine binds its receptor, that associates with an heterotrimeric G protein. The G protein associates with adenylate cyclase that converts ATP to cAMP, spreading the signal (more details...)

Adenylate cyclase (EC 4.6.1.1, also known as adenylyl cyclase or AC) is a lyase enzyme. Image File history File links Download high-resolution version (837x481, 71 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Adenylate cyclase Cyclic adenosine monophosphate Epinephrine Adrenergic receptor ... Image File history File links Download high-resolution version (837x481, 71 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Adenylate cyclase Cyclic adenosine monophosphate Epinephrine Adrenergic receptor ... The Enzyme Commission number (EC number) is a numerical classification scheme for enzymes, based on the chemical reactions they catalyze. ... In biochemistry, a lyase is an enzyme that breaks various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ...

Types

There are nine known adenylate cyclases in mammals: Subclasses & Infraclasses Subclass †Allotheria* Subclass Prototheria Subclass Theria Infraclass †Trituberculata Infraclass Metatheria Infraclass Eutheria Mammals (class Mammalia) are warm-blooded, vertebrate animals characterized by the production of milk in female mammary glands and the presence of hair, three middle ear bones used in hearing, and a neocortex region in the...

• ADCY1
• ADCY2
• ADCY3
• ADCY4
• ADCY5
• ADCY6
• ADCY7
• ADCY8
• ADCY9

Reaction

Adenylate cyclase catalyzes the conversion of ATP to 3',5'-cyclic AMP (cAMP) and pyrophosphate. In chemistry and biology, catalysis is the acceleration (increase in rate) of a chemical reaction by means of a substance, called a catalyst, that is itself not consumed by the overall reaction. ... Adenosine 5-triphosphate (ATP) is a multifunctional nucleotide that is most important as a molecular currency of intracellular energy transfer. ... Structure of cAMP Cyclic adenosine monophosphate (cAMP, cyclic AMP or 3-5-cyclic adenosine monophosphate) is a molecule that is important in many biological processes; it is derived from adenosine triphosphate (ATP). ... In chemistry, the anion, the salts, and the esters of pyrophosphoric acid are called pyrophosphates. ...

The reaction that Adenylate Cyclase catalyzes is the conversion of ATP to 3',5'-cyclic AMP

cAMP is an important molecule in eukaryotic signal transduction, a so-called second messenger. Adenylate cyclase can be activated or inhibited by G proteins, which are coupled to membrane receptors and thus can respond to hormonal or other stimuli. Image File history File links Download high resolution version (818x369, 10 KB)Redrawn version. ... Image File history File links Download high resolution version (818x369, 10 KB)Redrawn version. ... Adenosine 5-triphosphate (ATP) is a multifunctional nucleotide that is most important as a molecular currency of intracellular energy transfer. ... Structure of cAMP Cyclic adenosine monophosphate (cAMP, cyclic AMP or 3-5-cyclic adenosine monophosphate) is a molecule that is important in many biological processes; it is derived from adenosine triphosphate (ATP). ... Kingdoms Animalia - Animals Fungi Plantae - Plants Protista Alternative Phylogeny Unikonta    Opisthokonta    Amoebozoa Bikonta    Apusozoa    Cabozoa       Rhizaria       Excavata    Corticata       Archaeplastida       Chromalveolata Animals, plants, fungi, and protists are eukaryotes (IPA: ), organisms with a complex cell or cells, where the genetic material is organized into a membrane-bound nucleus or nuclei. ... Overview of signal transduction pathways In biology, signal transduction refers to any process by which a cell converts one kind of signal or stimulus into another, most often involving ordered sequences of biochemical reactions inside the cell, that are carried out by enzymes and linked through second messengers resulting in... In biology, second messengers are low-weight diffusible molecules that are used in signal transduction to relay signals within a cell. ... G-proteins, short for guanine nucleotide binding proteins, are a family of proteins involved in second messenger cascades. ...

Structure

Structure of adenylate cyclase

Adenylyl cyclase is a transmembrane protein. It passes through the plasma membrane twelve times. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Drawing of a cell membrane A component of every biological cell, the cell membrane (or plasma membrane) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ...

The important parts for its function are located in the cytoplasm and can be subdivided into the N-terminus, C1a, C1b, C2a and C2b. It has been suggested that Cytoplast be merged into this article or section. ...

The C1 region exists between transmembrane helices six and seven and the C2 region follows transmembrane helix 12.

The C1a and C2a domains form a catalytic dimer where ATP binds and is converted to cAMP.

Regulation

Adenylate cyclase is stimulated by G proteins, and by forskolin, as well as other class-specific substrates: G-proteins, short for guanine nucleotide binding proteins, are a family of proteins involved in second messenger cascades. ... Chemical structure of forskolin Forskolin is a labdane diterpene that is produced by Coleus forskohlii (synonym: Plectranthus barbatus). ...

• Isoforms I, III and VIII are also stimulated by Ca²⁺/calmodulin.
• Isoforms V and VI are inhibited by Ca²⁺ in a calmodulin-independent manner.

In neurons, adenylate cyclases are located next to calcium ion channels for faster reaction to Ca²⁺ influx; they are suspected of playing an important role in learning processes. This is supported by the fact that adenylate cyclases are coincidence detectors, meaning that they are only activated by several different signals occurring together. General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Standard atomic weight 40. ... oommen sir is a fool. ... Drawing by Santiago Ramón y Cajal of neurons in the pigeon cerebellum. ... Ion channels are pore-forming proteins that help to establish and control the small voltage gradient that exists across the plasma membrane of all living cells (see cell potential) by allowing the flow of ions down their electrochemical gradient. ...

Additional images

Beta adrenergic receptor kinase pathway Image File history File links Download high-resolution version (1000x530, 54 KB) I made this diagram I, the creator of this work, hereby release it into the public domain. ... // Upon stimulation of the B-adrenergic receptor by epinephrine, Gs will be activated. ...

External links

• MeSH Adenylate+cyclase