Sandbox Reserved 1647: Difference between revisions
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Here, we show that T-bet acts through enhancers to allow the recruitment of [[Mediator]] and [https://proteopedia.org/wiki/index.php/3mi9 P-TEFb] in the formation of the super elongation complex (SEC). Th1 genes are occupied by [[RNA Polymerase II]] in Thp cells, while T-bet-mediated recruitment of P-TEFb and mediator and activates transcriptional elongation giving place to increased differentiation of Thp into Th1. | Here, we show that T-bet acts through enhancers to allow the recruitment of [[Mediator]] and [https://proteopedia.org/wiki/index.php/3mi9 P-TEFb] in the formation of the super elongation complex (SEC). Th1 genes are occupied by [[RNA Polymerase II]] in Thp cells, while T-bet-mediated recruitment of P-TEFb and mediator and activates transcriptional elongation giving place to increased differentiation of Thp into Th1.<ref name="T-bet Activates Th1 Genes through Mediator and the Super Elongation Complex">DOI 10.1016/j.celrep.2016.05.054</ref> | ||
T-bet can also regulate Th1 cell differentiation by directly initiating gamma interferon ([https://proteopedia.org/wiki/index.php/6f1e IFN-γ]) transcription and by suppressing Th2-specific transcription factor [https://proteopedia.org/wiki/index.php/3dfx GATA-3]. The T-bet induced expression of IFN-γ derives Th precursor cells to differentiate into Th1 effector cells. | T-bet can also regulate Th1 cell differentiation by directly initiating gamma interferon ([https://proteopedia.org/wiki/index.php/6f1e IFN-γ]) transcription and by suppressing Th2-specific transcription factor [https://proteopedia.org/wiki/index.php/3dfx GATA-3]<ref name="A novel transcription factor, T-bet, directs Th1 lineage commitment">DOI 10.1016/s0092-8674(00)80702-3</ref>. The T-bet induced expression of IFN-γ derives Th precursor cells to differentiate into Th1 effector cells. | ||
This stimulation of IFN-γ can take place thanks to the action of a nuclear tyrosine kinase, c-Abl. C-Abl induces phosphorylation of T-bet at tyrosine residues <scene name='86/868180/Tyr219/1'>TYR 219</scene>, <scene name='86/868180/Tyr265/1'>TYR 265</scene>, and <scene name='86/868180/Tyr304/1'>TYR 304</scene>. C-Abl phosphorylates the tyrosine residues within the T-box domain, which is the DNA-binding domain of T-bet. This phosphorylation leads to conformational changes of the T-box domain to facilitate the DNA-binding activity of T-bet and appears to play a crucial role in the IFN-γ promoter-binding activity of T-bet. | This stimulation of IFN-γ can take place thanks to the action of a nuclear tyrosine kinase, c-Abl. C-Abl induces phosphorylation of T-bet at tyrosine residues <scene name='86/868180/Tyr219/1'>TYR 219</scene>, <scene name='86/868180/Tyr265/1'>TYR 265</scene>, and <scene name='86/868180/Tyr304/1'>TYR 304</scene>. C-Abl phosphorylates the tyrosine residues within the T-box domain, which is the DNA-binding domain of T-bet. This phosphorylation leads to conformational changes of the T-box domain to facilitate the DNA-binding activity of T-bet and appears to play a crucial role in the IFN-γ promoter-binding activity of T-bet. | ||
Recently, many studies have reported that T-bet also modulates other Th cell lineages, including [https://en.wikipedia.org/wiki/T_helper_17_cell Th17], [https://en.wikipedia.org/wiki/Regulatory_T_cell Treg], and follicular Th (TFH) cells, in coordination with many transcription factors, such as the retinoic acid-related orphan receptor-𝛾t [https://proteopedia.org/wiki/index.php/6b30 (ROR𝛾t)], runt-related transcription factor 3 [https://proteopedia.org/wiki/index.php/3mpm (RUNX3)], and B-cell lymphoma-6 [https://proteopedia.org/wiki/index.php/3lbz (BCL6)]. These findings suggest that T-bet is a transcription factor that is critical for fine-tuning Th cell development. | Recently, many studies have reported that T-bet also modulates other Th cell lineages, including [https://en.wikipedia.org/wiki/T_helper_17_cell Th17], [https://en.wikipedia.org/wiki/Regulatory_T_cell Treg], and follicular Th (TFH) cells, in coordination with many transcription factors, such as the retinoic acid-related orphan receptor-𝛾t [https://proteopedia.org/wiki/index.php/6b30 (ROR𝛾t)] <ref name="T-bet represses T(H)17 differentiation by preventing Runx1-mediated activation of the gene encoding RORγt">DOI 10.1038/ni.1969</ref>, runt-related transcription factor 3 [https://proteopedia.org/wiki/index.php/3mpm (RUNX3)], and B-cell lymphoma-6 [https://proteopedia.org/wiki/index.php/3lbz (BCL6)]. These findings suggest that T-bet is a transcription factor that is critical for fine-tuning Th cell development. | ||
=== TBX21 as an antiasthmatic regulator === | === TBX21 as an antiasthmatic regulator === | ||
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In T-bet structure, ubiquitination takes place at <scene name='86/868180/Lys313/1'>LYS 313</scene>. It has an impact on the stability of the protein and leads to the degradation of the protein by the proteosome. Some research found the role of deubiquitinases involved in T-bet stability and function. As a deubiquitinase, USP10 belongs to the ubiquitin-specificprotease family of cysteine proteases. Cysteine 424 site on [https://en.wikipedia.org/wiki/USP10 USP10] is crucial for its hydrolase activity. Results have shown that USP10 could interact with T-bet and stabilize it via interaction between Lysine 313 (K313) of T-bet and Cysteine 424 of USP10. Deubiquitination inhibits its degradation by the proteosome and enhance the secretion of IFN- γ. | In T-bet structure, ubiquitination takes place at <scene name='86/868180/Lys313/1'>LYS 313</scene>. It has an impact on the stability of the protein and leads to the degradation of the protein by the proteosome. Some research found the role of deubiquitinases involved in T-bet stability and function. As a deubiquitinase, USP10 belongs to the ubiquitin-specificprotease family of cysteine proteases. Cysteine 424 site on [https://en.wikipedia.org/wiki/USP10 USP10] is crucial for its hydrolase activity. Results have shown that USP10 could interact with T-bet and stabilize it via interaction between Lysine 313 (K313) of T-bet and Cysteine 424 of USP10. Deubiquitination inhibits its degradation by the proteosome and enhance the secretion of IFN- γ. | ||
Researchers believe that the USP10-dependent T-bet deubiquitination and stabilization can regulate antigen induced immune disorder especially in Th1 specific inflammation. Thus, appropriate decreasing USP10 level may contribute to the T-bet degradation and inflammation attenuation. | Researchers believe that the USP10-dependent T-bet deubiquitination and stabilization can regulate antigen induced immune disorder especially in Th1 specific inflammation. Thus, appropriate decreasing USP10 level may contribute to the T-bet degradation and inflammation attenuation. <ref name="Deubiquitination and stabilization of T-bet by USP10">DOI 10.1016/j.bbrc.2014.05.037</ref> | ||
