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Adenylate cyclase

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G protein signal transduction (epinephrin pathway)

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.

TypesEdit

There are nine known adenylate cyclases in mammals:

ReactionEdit

Adenylate cyclase catalyzes the conversion of ATP to 3',5'-cyclic AMP (cAMP) and pyrophosphate.

Adenylate kinase

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.

StructureEdit

Adenylyl cyclase

Structure of adenylate cyclase

Adenylyl cyclase is a transmembrane protein. It passes through the plasma membrane twelve times.

The important parts for its function are located in the cytoplasm and can be subdivided into the N-terminus, C1a, C1b, C2a and C2b.

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.

RegulationEdit

Adenylate cyclase is stimulated by G proteins, and by forskolin, as well as other class-specific substrates:

  • 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.

Additional imagesEdit

External linksEdit


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