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2025-02-18T04:48:44Z

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← Older revision		Revision as of 04:48, 18 February 2025
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	[[Category:Epigenetics]]		[[Category:Epigenetics]]
	[[Category:Gene expression]]		[[Category:Gene expression]]
			<gallery>
			File:Lysine_demethylation.svg\|Lysine demethylation process
			File:Jmjd2a(2UXX)_with_domains_highlighted.png\|Jmjd2a structure with domains highlighted
			File:Lysine_specific_demethylase_1.png\|Lysine specific demethylase 1
			File:1a2o_structure.png\|1a2o structure
			File:Chemotaxis_Regulation_within_E._coli.png\|Chemotaxis regulation within E. coli
			</gallery>

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2024-12-03T21:17:10Z

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{{Short description|Enzyme that removes methyl groups from molecules}}
{{Infobox enzyme
| name = Demethylase
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'''Demethylases''' are a class of [[enzymes]] that remove [[methyl groups]] from [[methylated]] molecules, a process known as [[demethylation]]. These enzymes play a crucial role in the regulation of [[gene expression]], [[epigenetic]] modifications, and the metabolism of various compounds within the cell.

==Function==
Demethylases are involved in the removal of methyl groups from [[DNA]], [[RNA]], and [[histones]], which are proteins that help package DNA into [[chromatin]]. This process is essential for the regulation of gene expression, as methylation typically acts to repress gene activity. By removing methyl groups, demethylases can activate genes that were previously silenced.

===DNA Demethylation===
DNA demethylation is a critical process in [[epigenetics]], where demethylases remove methyl groups from [[cytosine]] bases in DNA. This can lead to the reactivation of genes that are important for development and differentiation. The [[TET family]] of enzymes is known to play a significant role in DNA demethylation.

===Histone Demethylation===
Histone demethylases remove methyl groups from lysine and arginine residues on histone proteins. This modification can alter the chromatin structure and influence gene expression. The [[LSD1]] and [[JmjC]] domain-containing families are well-known histone demethylases.

==Types of Demethylases==
Demethylases can be broadly categorized based on their substrate specificity and the type of methylation they reverse. Some of the major types include:

* '''DNA Demethylases''': Enzymes like TET1, TET2, and TET3 that are involved in the oxidation of 5-methylcytosine to 5-hydroxymethylcytosine, leading to DNA demethylation.
* '''Histone Demethylases''': Enzymes such as LSD1 (lysine-specific demethylase 1) and the JmjC domain-containing demethylases, which remove methyl groups from histone proteins.

==Mechanism==
Demethylases typically function by oxidizing the methyl group, which can then be removed as formaldehyde or further processed. The specific mechanism can vary depending on the type of demethylase and its substrate.

==Clinical Significance==
Aberrant demethylation is associated with various diseases, including [[cancer]], [[neurological disorders]], and [[autoimmune diseases]]. Understanding the role of demethylases in these conditions can lead to the development of targeted therapies.

==Research and Applications==
Research into demethylases is ongoing, with a focus on understanding their role in normal physiology and disease. Inhibitors of specific demethylases are being explored as potential therapeutic agents in cancer and other diseases.

==Also see==
* [[Methylation]]
* [[Epigenetics]]
* [[Histone modification]]
* [[Gene expression]]
* [[TET enzymes]]

{{Enzymes}}
{{Epigenetics}}

[[Category:Enzymes]]
[[Category:Epigenetics]]
[[Category:Gene expression]]

Demethylase - Revision history

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Prab: CSV import