Enzyme-coupled Receptor: Difference between revisions
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Enzyme-coupled receptors are a major kind of cell membrane receptors characterized either by having an intrinsic enzymatic activity on their cytosolic domain or by being coupled with an enzyme. These receptors are very diverse but they can be classified in six main classes<ref>Alberts, et al. Molecular Biology of the Cell. 5th ed. Garland Science. 2008</ref>:<br> | Enzyme-coupled receptors are a major kind of cell membrane receptors characterized either by having an intrinsic enzymatic activity on their cytosolic domain or by being coupled with an [[Enzyme|enzyme]]. These receptors are very diverse but they can be classified in six main classes<ref>Alberts, et al. Molecular Biology of the Cell. 5th ed. Garland Science. 2008</ref>:<br> | ||
*'''Receptor tyrosine kinases (RTKs)''' usually phophorylate some of their own tyrosine residues. Once phosphorylated they become docking sites for other intracellular signalling proteins. RTKs include the [[Insuline receptor|insuline receptor]] and many growth factor receptors.<br> | *'''Receptor tyrosine kinases (RTKs)''' usually phophorylate some of their own [[Tyrosine|tyrosine]] residues. Once phosphorylated they become docking sites for other intracellular signalling proteins. RTKs include the [[Insuline receptor|insuline receptor]] and many growth factor receptors.<br> | ||
*'''Tyrosine-kinase-associated receptors '''are coupled to tyrosine kinases (such as [[Src|Src]] or [[JAK|JAK]] kinases) on the cytosolic side of the membrane. Receptors for the [[Growth hormone|growth hormone]], [[Prolactin|prolactin]], [[Erythropoietin|erythropoietin]] and [[Alpha-interferon|alpha]] and [[Gamma interferon|gamma interferons]] are part of this group.<br> | *'''Tyrosine-kinase-associated receptors '''are coupled to [[Tyrosine kinase|tyrosine kinases]] (such as [[Src|Src]] or [[JAK|JAK]] kinases) on the cytosolic side of the membrane. Receptors for the [[Growth hormone|growth hormone]], [[Prolactin|prolactin]], [[Erythropoietin|erythropoietin]] and [[Alpha-interferon|alpha]] and [[Gamma interferon|gamma interferons]] are part of this group.<br> | ||
*'''Receptor serine/threonine kinases '''phosphorylate serine and threonine residues on themselves or associated proteins. The receptor for the [[Transforming growth factor β|transforming growth factor β ]](TGFβ) acts as a serine/threonine kinase).<br> | *'''Receptor serine/threonine kinases '''phosphorylate [[Serine|serine]] and [[Threonine|threonine]] residues on themselves or associated proteins. The receptor for the [[Transforming growth factor β|transforming growth factor β ]](TGFβ) acts as a [[Serine/threonine kinase|serine/threonine kinase]]).<br> | ||
*'''Histidine-kinase-associated receptors, '''important in bacterial [[Chemotaxis|chemotaxis]]. | *'''Histidine-kinase-associated receptors, '''important in bacterial [[Chemotaxis|chemotaxis]]. | ||
*'''Receptor guanylyl cyclases''' act through the production of the second messenger [[CGMP|cGMP]]. | *'''Receptor guanylyl cyclases''' act through the production of the second messenger [[CGMP|cGMP]]. | ||
Revision as of 22:24, 14 November 2010
Enzyme-coupled receptors are a major kind of cell membrane receptors characterized either by having an intrinsic enzymatic activity on their cytosolic domain or by being coupled with an enzyme. These receptors are very diverse but they can be classified in six main classes[1]:
- Receptor tyrosine kinases (RTKs) usually phophorylate some of their own tyrosine residues. Once phosphorylated they become docking sites for other intracellular signalling proteins. RTKs include the insuline receptor and many growth factor receptors.
- Tyrosine-kinase-associated receptors are coupled to tyrosine kinases (such as Src or JAK kinases) on the cytosolic side of the membrane. Receptors for the growth hormone, prolactin, erythropoietin and alpha and gamma interferons are part of this group.
- Receptor serine/threonine kinases phosphorylate serine and threonine residues on themselves or associated proteins. The receptor for the transforming growth factor β (TGFβ) acts as a serine/threonine kinase).
- Histidine-kinase-associated receptors, important in bacterial chemotaxis.
- Receptor guanylyl cyclases act through the production of the second messenger cGMP.
- Receptorlike (unknown ligand) tyrosine phosphatases have intrinsic phosphatase
References
- ↑ Alberts, et al. Molecular Biology of the Cell. 5th ed. Garland Science. 2008