SPINDOC promotes genome-wide redistribution of Spindlin1
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE247551 | GEO | 2023/11/18
REPOSITORIES: GEO
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Project description:Lysine and arginine methylation are amongst the most frequent modifications on unstructured histone tails and in combination with other modifications provide the basis for a combinatorial 'chromatin or histone code'. Recognition of modified histone residues is accomplished in a specific manner by 'reader' domains that recognize chromatin modifications allowing to associate with specific effector complexes mediating chromatin functions. The methyl-lysine and methyl-arginine reader domain protein SPINDLIN1 (SPIN1) belongs to a family of 5 human genes, and has been identified as a putative oncogene and transcriptional co-activator containing three Tudor domains, able to mediate chromatin binding. Here we report on the discovery of the potent and selective bivalent Tudor domain inhibitor VinSPINIn* (see Footnote), which simultaneously engages Tudor domains 1 and 2 and effectively competes with chromatin binding. Inhibitor, chemoproteomic and knockdown studies in squamous cell carcinoma suggest an un-anticipated complexity of SPIN isoform mediated interactions in regulating cellular phenotypes.
2022-02-23 | PXD011703 | Pride
Project description:Lysine and arginine methylation are amongst the most frequent modifications on unstructured histone tails and in combination with other modifications provide the basis for a combinatorial 'chromatin or histone code'. Recognition of modified histone residues is accomplished in a specific manner by 'reader' domains that recognize chromatin modifications allowing to associate with specific effector complexes mediating chromatin functions. The methyl-lysine and methyl-arginine reader domain protein SPINDLIN1 (SPIN1) belongs to a family of 5 human genes, and has been identified as a putative oncogene and transcriptional co-activator containing three Tudor domains, able to mediate chromatin binding. Here we report on the discovery of the potent and selective bivalent Tudor domain inhibitor VinSPINIn, which simultaneously engages Tudor domains 1 and 2 and effectively competes with chromatin binding. Inhibitor, chemoproteomic and knockdown studies in squamous cell carcinoma suggest an un-anticipated complexity of SPIN isoform mediated interactions in regulating cellular phenotypes.
2018-11-29 | GSE123084 | GEO
Project description:The histone lysine acetyltransferase TIP60 is the main enzyme that catalyzes histone H4 acetylation in cells. Domains on TIP60 regulate its enzymatic activity from different aspects. Here we use a CRISPR-Cas9 tiling screen to scan for essential domains on TIP60 protein and found that the Tudor-knot domain is essential for cell survival and intercellular H4 acetylation. We performed in-vitro biochemical assays and demonstrated Tudor-knot domain is not a histone reader. And deficiency of the Tudor-knot domain has mild effects on TIP60 intracellular localization, as well as the TIP60 complex’s constitution. But Tudor-knot deficiency significantly reduces TIP60 HAT activity both in vivo and in vitro. By comparing the catalytic efficiency of nucleosome substrate and histone octamer substrate, as well as TIP60 protein alone or TIP60 complex, we found the nucleosomal structure and other TIP60 complex components are required for Tudor-knot relative HAT activity regulation. We propose that the Tudor-knot domain function to increase nucleosome accessibility. Finally, we show that the Tudor-knot domain is required for TIP60-dependent transcription regulation. Altogether, our study reveals a mechanism that the Tudor-knot domain that regulates TIP60-dependent transcription through the regulation of TIP60 substrate catalytic efficiency.
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Project description:The histone lysine acetyltransferase TIP60 is the main enzyme that catalyzes histone H4 acetylation in cells. Domains on TIP60 regulate its enzymatic activity from different aspects. Here we use a CRISPR-Cas9 tiling screen to scan for essential domains on TIP60 protein and found that the Tudor-knot domain is essential for cell survival and intercellular H4 acetylation. We performed in-vitro biochemical assays and demonstrated Tudor-knot domain is not a histone reader. And deficiency of the Tudor-knot domain has mild effects on TIP60 intracellular localization, as well as the TIP60 complex’s constitution. But Tudor-knot deficiency significantly reduces TIP60 HAT activity both in vivo and in vitro. By comparing the catalytic efficiency of nucleosome substrate and histone octamer substrate, as well as TIP60 protein alone or TIP60 complex, we found the nucleosomal structure and other TIP60 complex components are required for Tudor-knot relative HAT activity regulation. We propose that the Tudor-knot domain function to increase nucleosome accessibility. Finally, we show that the Tudor-knot domain is required for TIP60-dependent transcription regulation. Altogether, our study reveals a mechanism that the Tudor-knot domain that regulates TIP60-dependent transcription through the regulation of TIP60 substrate catalytic efficiency.
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Project description:SPINDOC promotes genome-wide redistribution of Spindlin1
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Project description:Using a library of tagged UNC1215 analogs, we screened a protein domain microarray of methyl-lysine effector molecules to rapidly detect compounds with novel binding profiles. Using this approach, we identified a compound (EML405) that acquired a novel interaction with the Tudor domain-containing protein Spindlin1 (SPIN1). Structural studies revealed that the symmetric nature of EML405 allows it to simultaneously engage two of SPIN1’s Tudor domains, and also facilitated the rational synthesis of more selective SPIN1 inhibitor (EML631). The EML631 compound engages SPIN1 in cells, blocks its ability to “read” H3K4me3 marks, and inhibits its transcriptional coactivator activity.
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Project description:Specific sites of histone tail methylation are associated with transcriptional activity at gene loci. These methyl-marks are interpreted by effector molecules, which harbor protein domains that bind the methylated motifs and facilitate either active or inactive states of transcription. CARM1 and PRMT1 are transcriptional coactivators that deposit H3R17me2a and H4R3me2a marks, respectively. We used a protein domain microarray approach to identify the tudor domain-containing protein TDRD3 as a “reader” of these marks. Importantly, TDRD3 itself is a transcriptional coactivator. This coactivator activity requires an intact tudor domain. TDRD3 is recruited to an estrogen responsive element in a CARM1-dependent manner. Furthermore, ChIP-seq analysis of TDRD3 reveals that it is predominantly localized to transcriptional start site. Thus, TDRD3 is an effector molecule that promotes transcription by binding methylarginine marks on histone tails.
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