{"id":2830,"date":"2019-03-15T19:18:06","date_gmt":"2019-03-15T10:18:06","guid":{"rendered":"http:\/\/163.180.4.222\/lab\/?p=2830"},"modified":"2019-03-15T19:18:06","modified_gmt":"2019-03-15T10:18:06","slug":"modification-of-histone-proteins-by-serotonin-in-the-nucleus","status":"publish","type":"post","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2830","title":{"rendered":"Modification of histone proteins by serotonin in the nucleus"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h5>The function of histone proteins can be modified through addition or removal of certain chemical groups. The addition of a serotonin molecule is a newly found histone modification that could influence gene expression.<\/h5>\n<p>&nbsp;<\/p>\n<div class=\"article__body serif cleared\">\n<p>Epigenetics has been defined as the study of heritable traits that do not involve changes in the DNA sequence. This view has been broadened by an avalanche of biochemical evidence revealing a complex and versatile array of molecular mechanisms that regulate gene expression without changing DNA sequences. These include chemical modifications of DNA and RNA molecules, as well as post-translational modifications of histones \u2014 the proteins around which DNA coils to form chromatin strands. Post-translational modifications of histones include acetylation, phosphorylation and methylation (addition of acetyl, phosphate and methyl groups, respectively) at specific amino-acid residues of these proteins<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR1\">1<\/a><\/sup>.\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s41586-019-1024-7\" data-track=\"click\" data-label=\"https:\/\/www.nature.com\/articles\/s41586-019-1024-7\" data-track-category=\"body text link\">Writing in\u00a0<i>Nature<\/i><\/a>, Farrelly\u00a0<i>et al<\/i>.<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR2\">2<\/a><\/sup>\u00a0report that histones can also be modified by the addition of serotonin, a molecule with essential roles in regulating neuron activity.<\/p>\n<p>&nbsp;<\/p>\n<aside class=\"recommended pull pull--left sans-serif\" data-label=\"Related\"><a href=\"https:\/\/www.nature.com\/articles\/s41586-019-1024-7\" data-track=\"click\" data-track-label=\"recommended article\"><img decoding=\"async\" class=\"recommended__image\" src=\"https:\/\/media.nature.com\/w400\/magazine-assets\/d41586-019-00532-z\/d41586-019-00532-z_16531928.jpg\" \/><\/a><\/p>\n<p class=\"recommended__title serif\">Read the paper: Histone serotonylation is a permissive modification that enhances TFIID binding to H3K4me3<\/p>\n<\/aside>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Serotonin is generated from the metabolism of the amino acid tryptophan. It functions as a neurotransmitter \u2014 a molecule that acts as a signal between neurons \u2014 and as a trophic factor that helps neurons to grow, survive and differentiate. Psychiatric disorders such as schizophrenia, depression and autism spectrum disorder have been linked to serotonin-dependent signalling during key periods of the development of the nervous system<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR3\">3<\/a><\/sup>.<\/p>\n<p>Signalling through various serotonin receptors leads to chromatin remodelling, whereby the conformation of chromatin changes in a way that permits gene expression<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR4\">4<\/a><\/sup>\u00a0(Fig. 1a). Serotonin-receptor-dependent chromatin remodelling is mediated by signals that include histone post-translational modifications<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR4\">4<\/a><\/sup>. How serotonin-driven signals are integrated with other molecular signals that affect chromatin architecture remains poorly explored.<\/p>\n<p>&nbsp;<\/p>\n<figure class=\"figure\">\n<div class=\"embed intensity--high\">\n<div class=\"embed intensity--high\"><img decoding=\"async\" class=\"figure__image\" src=\"https:\/\/media.nature.com\/w800\/magazine-assets\/d41586-019-00532-z\/d41586-019-00532-z_16529342.jpg\" alt=\"\" data-src=\"\/\/media.nature.com\/w800\/magazine-assets\/d41586-019-00532-z\/d41586-019-00532-z_16529342.jpg\" \/><\/div>\n<\/div><figcaption>\n<p class=\"figure__caption sans-serif\"><span class=\"mr10\"><b>Figure 1 | Serotonylation in cells.<\/b>\u00a0<b>a<\/b>, The molecule serotonin activates specific receptors on the cell membrane, triggering intracellular signalling events that lead to changes in chromatin (DNA plus histone proteins) and gene expression (not shown).\u00a0<b>b<\/b>, Internalization of serotonin through specialized transporters activates calcium-dependent transglutaminase enzymes (TGases) in the cytoplasm. These add serotonin molecules (a reaction called serotonylation) to certain small GTPase enzymes, such as Rab.<b>c,<\/b>\u00a0Farrelly\u00a0<i>et al<\/i>.<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR2\">2<\/a><\/sup>\u00a0show that serotonylation also occurs in the nucleus, in a serotonin-receptor-independent manner. A nuclear TGase called transglutaminase 2 (TGM2) adds serotonin to the glutamine amino-acid residue in position 5 of histone H3. This post-translational modification, dubbed Q5ser, occurs predominantly in combination with another modification of histone H3, the trimethylation of the lysine amino-acid residue at position 4 (K4me3). This modification is mediated by methyltransferase enzymes such as MLL1, which transfer a methyl group from\u00a0<i>S<\/i>-adenosylmethionine (SAM) to histone H3. The presence of K4me3 indicates that chromatin is in a transcriptionally active state, and the double mark K4me\/Q5ser might reinforce this state.<\/span><\/p>\n<\/figcaption><\/figure>\n<p>The study by Farrelly and colleagues reveals that serotonin can act on chromatin in a receptor-independent manner, by directly targeting histones through a post-translational modification called serotonylation. This chemical modification has been known for more than a decade on some non-nuclear proteins. Some small enzymes belonging to the GTPase family are serotonylated at specific glutamine amino-acid residues by other enzymes called calcium-dependent transglutaminases<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR5\">5<\/a><\/sup><sup>\u2013<\/sup><sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR7\">7<\/a><\/sup>\u00a0(Fig. 1b). This process has a role in the induction of cell division in smooth-muscle cells<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR5\">5<\/a><\/sup>, the regulation of insulin secretion by \u03b2-cells in the pancreas<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR6\">6<\/a><\/sup>\u00a0and the internalization of the protein that transports serotonin from blood into platelets<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR7\">7<\/a><\/sup>.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Although serotonylation in the nucleus had not previously been described, some intriguing hints supported its existence. A small fraction of the total amount of the enzyme transglutaminase 2 (TGM2) in cells<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR8\">8<\/a><\/sup>, as well as a portion of the cells\u2019 serotonin content<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR9\">9<\/a><\/sup>, were found in the nucleus. These observations suggested that serotonylation could target nuclear proteins, and thereby influence gene expression independently of serotonin receptors and their signalling pathways. Farrelly and colleagues detected serotonylation on the glutamine residue at position 5 of histone H3 (the H3Q5 position). As with many other targets of post-translational modifications of histones, this residue is located on the protein\u2019s amino-terminal region. No other serotonylation sites seem to exist on histones H3, H2A, H2B or H4, which highlights the remarkable specificity of this modification.<\/p>\n<p>The N-terminal tail of histone H3 is the best-characterized region of all histones. Many modifications that have functional significance (alone or in combination) have been described in this protein region over the past decade<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR10\">10<\/a><\/sup>. The trimethylation (addition of three methyl groups) of the lysine amino-acid residue at position 4 of histone H3 (H3K4) is considered the most reliable mark for identifying parts of the genome that are in a state that enables transcription. Notably, the enzymes responsible for transferring the first, second and third methyl groups to this lysine residue are unique<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR11\">11<\/a><\/sup>.<\/p>\n<p>Farrelly and colleagues report that TGM2 serotonylates H3Q5 when H3K4 is trimethylated (Fig. 1c). The combination of these two post-translational modifications is called H3K4me3Q5ser. Given that the modified lysine and glutamine residues are adjacent, the stability (or half-life) of the two modifications might be co-dependent. This proximity might also aid the recruitment of specialized chromatin-remodelling protein complexes. Indeed, the authors\u2019 findings suggest that H3K4me3Q5ser might help the function of the transcription factor TFIID, which acts on chromatin to promote transcription.<\/p>\n<p>These findings raise other compelling questions. Does TGM2 have a role in the function of the enzymes that methylate H3K4, such as MLL1? If so, future studies should try to clarify the functional interplay between these enzymes. Does serotonylation of H3Q5 influence other post-translational modifications, in a similar way to how the trimethylation of H3K4 and the acetylation of lysine residues at positions 9 and 14 of histone H3 influence each other<sup><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29#ref-CR12\">12<\/a><\/sup>? Are the intracellular pools of serotonin replenished in different ways depending on how serotonin is being used in various cellular compartments at any given time? Does extra-nuclear serotonin influence the serotonylation of histones by being transported into the nucleus on demand?<\/p>\n<p>Serotonylation of histones and its potential influence on transcription might be only the tip of the iceberg in an ever-expanding scenario of post-translational modifications associated with chromatin changes. Histaminylation and dopaminylation (addition of histamine, an amino acid, and dopamine, a neurotransmitter, respectively) are likely to join the party, which could complicate the task of deciphering the language of histone modifications. However, an exciting road to discovery seems to lie ahead.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"emphasis\">doi: 10.1038\/d41586-019-00532-z<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>(\uc6d0\ubb38: <a href=\"https:\/\/www.nature.com\/articles\/d41586-019-00532-z?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+nature%2Frss%2Fcurrent+%28Nature+-+Issue%29\">\uc5ec\uae30<\/a>\ub97c \ud074\ub9ad\ud558\uc138\uc694~)<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp; The function of histone proteins can be modified through addition or removal of certain chemical groups. The addition of a serotonin molecule is<a href=\"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2830\" class=\"more-link\">(more&#8230;)<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[33,34,29,30],"tags":[],"class_list":["post-2830","post","type-post","status-publish","format-standard","hentry","category-do-biology","category-lets-do-chemistry","category-lets-do-science","category-recent-science-news"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":4562,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=4562","url_meta":{"origin":2830,"position":0},"title":"Histone lactylation links metabolism and gene regulation","author":"biochemistry","date":"October 24, 2019","format":false,"excerpt":"\u00a0 \u00a0 Cells regulate gene expression in part through the chemical labelling of histone proteins. Discovery of a label derived from lactate molecules reveals a way in which cells link gene expression to nutrient metabolism. \u00a0 \u00a0 Cellular metabolism involves the uptake, release and biochemical interconversion of nutrients to produce\u2026","rel":"","context":"In &quot;Let's Do Biology!&quot;","block_context":{"text":"Let's Do Biology!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=33"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4191,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=4191","url_meta":{"origin":2830,"position":1},"title":"Remodeling the genome with DNA twists","author":"biochemistry","date":"October 6, 2019","format":false,"excerpt":"\u00a0 \u00a0 In complex organisms such as humans, a single genetic blueprint can give rise to a multitude of different cell types, from nerve to liver to muscle. 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But innate immunity, the first response to infection\u2026","rel":"","context":"In &quot;Let's Do Biology!&quot;","block_context":{"text":"Let's Do Biology!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=33"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2904,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2904","url_meta":{"origin":2830,"position":4},"title":"\uc778\uac04 \uc138\ud3ec\uc758 &#8216;DNA \ubcf5\uad6c&#8217; \ubbf8\uc2a4\ud130\ub9ac \ud480\ub838\ub2e4","author":"biochemistry","date":"March 22, 2019","format":false,"excerpt":"\u00a0 \u00a0 \ub3c5\uc77c \uc5f0\uad6c\uc9c4, '\ud788\uc2a4\ud1a4 \ucf54\ub4dc' \uc791\ub3d9 \uc6d0\ub9ac \uaddc\uba85 \u00a0 BARD\u00a01\ubd84\uc790\uc758\u00a0DNA\u00a0\ubcf5\uad6c \uba54\ucee4\ub2c8\uc998 \uacb0\uc815 \uacfc\uc815[\ud5ec\ub984\ud640\uce20 \uccb8\ud2b8\ub8f8 \ubb8c\ud5e8 \uc81c\uacf5] \u00a0 \uc138\ud3ec\uc758 \ub2e4\uc591\ud55c DNA\u00a0\ubcf5\uad6c \uba54\ucee4\ub2c8\uc998 \uac00\uc6b4\ub370 \ud2b9\uc815 \uba54\ucee4\ub2c8\uc998\uc774 \uc120\ud0dd\ub418\ub294 \uae30\uc900\uacfc \uacfc\uc815\uc744 \ub3c5\uc77c\uc758 \ud658\uacbd\ubcf4\uac74 \uc5f0\uad6c\uae30\uad00\uc778 '\ud5ec\ub984\ud640\uce20 \uccb8\ud2b8\ub8f8 \ubb8c\ud5e8(Helmholtz\u00a0ZentrumMuenchen)' \uacfc\ud559\uc790\ub4e4\uc774 \ubc1d\ud600\ub0c8\ub2e4. \ubcf4\uace0\uc11c\ub294 \uacfc\ud559 \uc800\ub110 '\ub124\uc774\ucc98 \uc138\ud3ec \uc0dd\ubb3c\ud559(Nature\u00a0CellBiology)'\uc5d0 \uc2e4\ub838\ub2e4. 27\uc77c(\ud604\uc9c0\uc2dc\uac04) \uc628\ub77c\uc778(www.eurekalert.org)\uc5d0 \ubc30\ud3ec\ub41c \ubcf4\ub3c4\uc790\ub8cc\uc5d0 \ub530\ub974\uba74 \uc5f0\uad6c\ud300\uc740 \uc138\ud3ec\ud575\uc5d0\uc11c\u2026","rel":"","context":"In &quot;Let's Do Biology!&quot;","block_context":{"text":"Let's Do Biology!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=33"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4197,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=4197","url_meta":{"origin":2830,"position":5},"title":"DNA pushes back the microbiome frontier","author":"biochemistry","date":"October 6, 2019","format":false,"excerpt":"\u00a0 \u00a0 Over the past 15 years, researchers have come to appreciate how profoundly the diverse zoo of microbes in the human gut, skin, and mouth affects our health. 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