O-methyltransferase: Difference between revisions

Latest revision as of 20:31, 30 December 2024

O-methyltransferase

O-methyltransferase is an enzyme that catalyzes the transfer of a methyl group from S-adenosyl methionine (SAM) to a substrate, resulting in the methylation of the substrate. This enzyme is involved in various biochemical pathways and plays a crucial role in the metabolism of xenobiotics, hormones, and neurotransmitters.

Function[edit]

O-methyltransferases are responsible for the methylation of hydroxyl groups on catecholamines, phenols, and other compounds. This process is essential for the inactivation and elimination of these compounds from the body. For example, the methylation of catecholamines such as dopamine, epinephrine, and norepinephrine is a key step in their metabolic degradation.

Types[edit]

There are several types of O-methyltransferases, each with specific substrate preferences:

Catechol-O-methyltransferase (COMT) - involved in the methylation of catecholamines and catechol estrogens.
Phenol-O-methyltransferase (POMT) - involved in the methylation of phenolic compounds.

Clinical Significance[edit]

O-methyltransferases have significant clinical implications. For instance, variations in the COMT gene can affect the metabolism of neurotransmitters and influence neurological disorders such as schizophrenia, bipolar disorder, and Parkinson's disease.

References[edit]

External Links[edit]

O-methyltransferase on WikiMD

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-'''O-methyltransferase''' ('''OMT''') is a type of [[enzyme]] that catalyzes the transfer of a [[methyl group]] from [[S-adenosyl methionine]] (SAM) to a specific [[substrate]]. This process is known as [[methylation]]. O-methyltransferases are found in a wide range of organisms, including [[bacteria]], [[plants]], and [[animals]], and play a crucial role in many biological processes.
+{{Infobox enzyme
+| name = O-methyltransferase
+| image = <!-- Image removed -->
+| width =
+| caption =
+| EC_number = 2.1.1.6
+| CAS_number = 9030-79-1
+| IUBMB_EC_number = 2/1/1/6
+| GO_code = 0008171
+}}
+'''O-methyltransferase''' is an [[enzyme]] that catalyzes the transfer of a [[methyl group]] from [[S-adenosyl methionine]] (SAM) to a substrate, resulting in the methylation of the substrate. This enzyme is involved in various [[biochemical pathways]] and plays a crucial role in the [[metabolism]] of [[xenobiotics]], [[hormones]], and [[neurotransmitters]].
 == Function ==
+O-methyltransferases are responsible for the [[methylation]] of [[hydroxyl]] groups on [[catecholamines]], [[phenols]], and other compounds. This process is essential for the [[inactivation]] and [[elimination]] of these compounds from the body. For example, the methylation of [[catecholamines]] such as [[dopamine]], [[epinephrine]], and [[norepinephrine]] is a key step in their [[metabolic degradation]].
-O-methyltransferases are involved in the methylation of a variety of substrates, including [[proteins]], [[nucleic acids]], and small molecules. This methylation can have a wide range of effects, depending on the substrate and the specific location of the methylation. For example, methylation of [[DNA]] can affect [[gene expression]], while methylation of proteins can alter their function or localization.
+== Types ==
+There are several types of O-methyltransferases, each with specific substrate preferences:
-In addition to their role in methylation, some O-methyltransferases also have other functions. For example, some are involved in the synthesis of [[secondary metabolites]], which are small molecules that are not necessary for the basic metabolic processes of an organism, but can have important roles in interactions with the environment or other organisms.
+* '''Catechol-O-methyltransferase''' (COMT) - involved in the methylation of catecholamines and catechol estrogens.
+* '''Phenol-O-methyltransferase''' (POMT) - involved in the methylation of phenolic compounds.
-== Structure ==
+== Clinical Significance ==
+O-methyltransferases have significant clinical implications. For instance, variations in the [[COMT gene]] can affect the [[metabolism]] of [[neurotransmitters]] and influence [[neurological disorders]] such as [[schizophrenia]], [[bipolar disorder]], and [[Parkinson's disease]].
-O-methyltransferases are typically composed of a single polypeptide chain, which folds into a specific three-dimensional structure. The active site of the enzyme, where the methylation reaction takes place, is usually located in a cleft or pocket in this structure. The structure of the enzyme can vary depending on the specific substrate it acts on.
+== See Also ==
+* [[Methylation]]
-== Clinical significance ==
+* [[Enzyme]]
-Alterations in the function of O-methyltransferases can have significant clinical implications. For example, mutations in the genes encoding these enzymes can lead to diseases such as [[cancer]], [[neurodegenerative diseases]], and [[cardiovascular diseases]]. In addition, some drugs work by inhibiting the activity of specific O-methyltransferases, making these enzymes important targets for [[drug discovery]] and development.
-[[File:O-methyltransferase.png|thumb|right|300px|Structure of an O-methyltransferase enzyme.]]
-== See also ==
-* [[Methyltransferase]]
 * [[S-adenosyl methionine]]
-* [[Methylation]]
+* [[Catecholamine]]
 == References ==
+{{Reflist}}
-<references />
+== External Links ==
+* [https://www.wikimd.com/wiki/O-methyltransferase O-methyltransferase on WikiMD]
-{{medicine-stub}}
 [[Category:Enzymes]]
-[[Category:EC 2.1.1]]
+[[Category:Methylation]]
-[[Category:Molecular biology]]
+[[Category:Metabolism]]
 [[Category:Biochemistry]]
-{{NoIndexOrphaned}}