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  • 1
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    Structural basis for recognition of hemi-methylated DNA by the SRA domain of human UHRF1 (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-09-06
    Description: Epigenetic inheritance in mammals is characterized by high-fidelity replication of CpG methylation patterns during development. UHRF1 (also known as ICBP90 in humans and Np95 in mouse) is an E3 ligase important for the maintenance of global and local DNA methylation in vivo. The preferential affinity of UHRF1 for hemi-methylated DNA over symmetrically methylated DNA by means of its SET and RING-associated (SRA) domain and its association with the maintenance DNA methyltransferase 1 (DNMT1) suggests a role in replication of the epigenetic code. Here we report the 1.7 A crystal structure of the apo SRA domain of human UHRF1 and a 2.2 A structure of its complex with hemi-methylated DNA, revealing a previously unknown reading mechanism for methylated CpG sites (mCpG). The SRA-DNA complex has several notable structural features including a binding pocket that accommodates the 5-methylcytosine that is flipped out of the duplex DNA. Two specialized loops reach through the resulting gap in the DNA from both the major and the minor grooves to read the other three bases of the CpG duplex. The major groove loop confers both specificity for the CpG dinucleotide and discrimination against methylation of deoxycytidine of the complementary strand. The structure, along with mutagenesis data, suggests how UHRF1 acts as a key factor for DNMT1 maintenance methylation through recognition of a fundamental unit of epigenetic inheritance, mCpG.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Avvakumov, George V -- Walker, John R -- Xue, Sheng -- Li, Yanjun -- Duan, Shili -- Bronner, Christian -- Arrowsmith, Cheryl H -- Dhe-Paganon, Sirano -- Wellcome Trust/United Kingdom -- England -- Nature. 2008 Oct 9;455(7214):822-5. doi: 10.1038/nature07273. Epub 2008 Sep 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural Genomics Consortium, University of Toronto, 100 College Street, Toronto, Ontario M5G 1L5, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18772889" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine/metabolism ; Binding Sites ; CCAAT-Enhancer-Binding Proteins/*chemistry/*metabolism ; CpG Islands/genetics ; Crystallography, X-Ray ; DNA/*chemistry/genetics/*metabolism ; DNA (Cytosine-5-)-Methyltransferase/metabolism ; *DNA Methylation ; Epigenesis, Genetic ; Humans ; Models, Molecular ; Molecular Conformation ; Protein Structure, Tertiary
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    FBXO11 targets BCL6 for degradation and is inactivated in diffuse large B-cell lymphomas (2011)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2011-11-25
    Description: BCL6 is the product of a proto-oncogene implicated in the pathogenesis of human B-cell lymphomas. By binding specific DNA sequences, BCL6 controls the transcription of a variety of genes involved in B-cell development, differentiation and activation. BCL6 is overexpressed in the majority of patients with aggressive diffuse large B-cell lymphoma (DLBCL), the most common lymphoma in adulthood, and transgenic mice constitutively expressing BCL6 in B cells develop DLBCLs similar to the human disease. In many DLBCL patients, BCL6 overexpression is achieved through translocation (~40%) or hypermutation of its promoter (~15%). However, many other DLBCLs overexpress BCL6 through an unknown mechanism. Here we show that BCL6 is targeted for ubiquitylation and proteasomal degradation by a SKP1-CUL1-F-box protein (SCF) ubiquitin ligase complex that contains the orphan F-box protein FBXO11 (refs 5, 6). The gene encoding FBXO11 was found to be deleted or mutated in multiple DLBCL cell lines, and this inactivation of FBXO11 correlated with increased levels and stability of BCL6. Similarly, FBXO11 was either deleted or mutated in primary DLBCLs. Notably, tumour-derived FBXO11 mutants displayed an impaired ability to induce BCL6 degradation. Reconstitution of FBXO11 expression in FBXO11-deleted DLBCL cells promoted BCL6 ubiquitylation and degradation, inhibited cell proliferation, and induced cell death. FBXO11-deleted DLBCL cells generated tumours in immunodeficient mice, and the tumorigenicity was suppressed by FBXO11 reconstitution. We reveal a molecular mechanism controlling BCL6 stability and propose that mutations and deletions in FBXO11 contribute to lymphomagenesis through BCL6 stabilization. The deletions/mutations found in DLBCLs are largely monoallelic, indicating that FBXO11 is a haplo-insufficient tumour suppressor gene.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3344385/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3344385/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Duan, Shanshan -- Cermak, Lukas -- Pagan, Julia K -- Rossi, Mario -- Martinengo, Cinzia -- di Celle, Paola Francia -- Chapuy, Bjoern -- Shipp, Margaret -- Chiarle, Roberto -- Pagano, Michele -- 242965/European Research Council/International -- P01-CA092625/CA/NCI NIH HHS/ -- R01 GM057587/GM/NIGMS NIH HHS/ -- R01 GM057587-13/GM/NIGMS NIH HHS/ -- R01 GM057587-14/GM/NIGMS NIH HHS/ -- R01-GM57587/GM/NIGMS NIH HHS/ -- R21 CA161108/CA/NCI NIH HHS/ -- R21 CA161108-01/CA/NCI NIH HHS/ -- R21-CA161108/CA/NCI NIH HHS/ -- R37 CA076584/CA/NCI NIH HHS/ -- R37 CA076584-14/CA/NCI NIH HHS/ -- R37 CA076584-15/CA/NCI NIH HHS/ -- R37-CA76584/CA/NCI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2012 Jan 5;481(7379):90-3. doi: 10.1038/nature10688.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, NYU Cancer Institute, New York University School of Medicine, New York, New York 10016, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22113614" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Apoptosis ; Cell Line, Tumor ; Cell Proliferation ; DNA-Binding Proteins/genetics/*metabolism ; F-Box Proteins/*genetics/*metabolism ; Gene Deletion ; Genes, Tumor Suppressor ; HEK293 Cells ; Humans ; Lymphoma, Large B-Cell, Diffuse/enzymology/*genetics/*metabolism/pathology ; Mice ; Mutation/*genetics ; Neoplasm Transplantation ; Proteasome Endopeptidase Complex/metabolism ; Protein Stability ; Protein-Arginine N-Methyltransferases/deficiency/*genetics/*metabolism ; *Proteolysis ; SKP Cullin F-Box Protein Ligases/metabolism ; Ubiquitination
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Frequent mutation of BAP1 in metastasizing uveal melanomas (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-11-06
    Description: Metastasis is a defining feature of malignant tumors and is the most common cause of cancer-related death, yet the genetics of metastasis are poorly understood. We used exome capture coupled with massively parallel sequencing to search for metastasis-related mutations in highly metastatic uveal melanomas of the eye. Inactivating somatic mutations were identified in the gene encoding BRCA1-associated protein 1 (BAP1) on chromosome 3p21.1 in 26 of 31 (84%) metastasizing tumors, including 15 mutations causing premature protein termination and 5 affecting its ubiquitin carboxyl-terminal hydrolase domain. One tumor harbored a frameshift mutation that was germline in origin, thus representing a susceptibility allele. These findings implicate loss of BAP1 in uveal melanoma metastasis and suggest that the BAP1 pathway may be a valuable therapeutic target.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3087380/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3087380/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harbour, J William -- Onken, Michael D -- Roberson, Elisha D O -- Duan, Shenghui -- Cao, Li -- Worley, Lori A -- Council, M Laurin -- Matatall, Katie A -- Helms, Cynthia -- Bowcock, Anne M -- AR007279-31A1/AR/NIAMS NIH HHS/ -- P30 EY02687C/EY/NEI NIH HHS/ -- R01 CA125970/CA/NCI NIH HHS/ -- R01 CA125970-06/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2010 Dec 3;330(6009):1410-3. doi: 10.1126/science.1194472. Epub 2010 Nov 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA. harbour@vision.wustl.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21051595" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line, Tumor ; Chromosome Deletion ; Chromosomes, Human, Pair 3/genetics ; Frameshift Mutation ; Germ-Line Mutation ; Humans ; Melanoma/*genetics/*secondary ; *Mutation ; Mutation, Missense ; *Neoplasm Metastasis ; Protein Structure, Tertiary ; RNA Interference ; RNA, Messenger/genetics/metabolism ; RNA, Neoplasm/genetics/metabolism ; Sequence Analysis, DNA ; Tumor Suppressor Proteins/chemistry/*genetics/metabolism ; Ubiquitin Thiolesterase/chemistry/*genetics/metabolism ; Uveal Neoplasms/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Aging stem cells. A Werner syndrome stem cell model unveils heterochromatin alterations as a driver of human aging (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-05-02
    Description: Werner syndrome (WS) is a premature aging disorder caused by WRN protein deficiency. Here, we report on the generation of a human WS model in human embryonic stem cells (ESCs). Differentiation of WRN-null ESCs to mesenchymal stem cells (MSCs) recapitulates features of premature cellular aging, a global loss of H3K9me3, and changes in heterochromatin architecture. We show that WRN associates with heterochromatin proteins SUV39H1 and HP1alpha and nuclear lamina-heterochromatin anchoring protein LAP2beta. Targeted knock-in of catalytically inactive SUV39H1 in wild-type MSCs recapitulates accelerated cellular senescence, resembling WRN-deficient MSCs. Moreover, decrease in WRN and heterochromatin marks are detected in MSCs from older individuals. Our observations uncover a role for WRN in maintaining heterochromatin stability and highlight heterochromatin disorganization as a potential determinant of human aging.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4494668/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4494668/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Weiqi -- Li, Jingyi -- Suzuki, Keiichiro -- Qu, Jing -- Wang, Ping -- Zhou, Junzhi -- Liu, Xiaomeng -- Ren, Ruotong -- Xu, Xiuling -- Ocampo, Alejandro -- Yuan, Tingting -- Yang, Jiping -- Li, Ying -- Shi, Liang -- Guan, Dee -- Pan, Huize -- Duan, Shunlei -- Ding, Zhichao -- Li, Mo -- Yi, Fei -- Bai, Ruijun -- Wang, Yayu -- Chen, Chang -- Yang, Fuquan -- Li, Xiaoyu -- Wang, Zimei -- Aizawa, Emi -- Goebl, April -- Soligalla, Rupa Devi -- Reddy, Pradeep -- Esteban, Concepcion Rodriguez -- Tang, Fuchou -- Liu, Guang-Hui -- Belmonte, Juan Carlos Izpisua -- F32 AG047770/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 2015 Jun 5;348(6239):1160-3. doi: 10.1126/science.aaa1356. Epub 2015 Apr 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China. ; Biodynamic Optical Imaging Center, College of Life Sciences, Peking University, Beijing 100871, China. ; Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA. ; State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. ; Diagnosis and Treatment Center for Oral Disease, the 306th Hospital of the PLA, Beijing, China. ; Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA. ; College of Life Sciences, Peking University, Beijing 100871, China. ; The Center for Anti-aging and Regenerative Medicine, Shenzhen University, Shenzhen 518060, China. ; Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA. Universidad Catolica San Antonio de Murcia, Campus de los Jeronimos s/n, 30107 Guadalupe, Murcia, Spain. ; Biodynamic Optical Imaging Center, College of Life Sciences, Peking University, Beijing 100871, China. Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Beijing 100871, China. Center for Molecular and Translational Medicine (CMTM), Beijing 100101, China. Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China. ghliu@ibp.ac.cn tangfuchou@pku.edu.cn belmonte@salk.edu. ; National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China. The Center for Anti-aging and Regenerative Medicine, Shenzhen University, Shenzhen 518060, China. Center for Molecular and Translational Medicine (CMTM), Beijing 100101, China. Beijing Institute for Brain Disorders, Beijing 100069, China. ghliu@ibp.ac.cn tangfuchou@pku.edu.cn belmonte@salk.edu. ; Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA. ghliu@ibp.ac.cn tangfuchou@pku.edu.cn belmonte@salk.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25931448" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/genetics/*metabolism ; Animals ; *Cell Aging ; Cell Differentiation ; Centromere/metabolism ; Chromosomal Proteins, Non-Histone/metabolism ; DNA-Binding Proteins/metabolism ; Epigenesis, Genetic ; Exodeoxyribonucleases/genetics/*metabolism ; Gene Knockout Techniques ; HEK293 Cells ; Heterochromatin/chemistry/*metabolism ; Humans ; Membrane Proteins/metabolism ; Mesenchymal Stromal Cells/*metabolism ; Methyltransferases/genetics/metabolism ; Mice ; Models, Biological ; RecQ Helicases/genetics/*metabolism ; Repressor Proteins/genetics/metabolism ; Werner Syndrome/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
    Electronic Resource
    Electronic Resource
    Aseptic culture of gynophores to obtain peanut intersectional hybrids (1995)
    Springer
    Euphytica 81 (1995), S. 245-249 
    Details
    ISSN: 1573-5060
    Keywords: peanut ; gynophore culture ; intersectional hybrid ; Arachis hypogaea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Cross-incompatibility between cultivated peanuts and their wild relatives outside the section Arachis has impeded the utilization of many species possessing high resistances or good qualities. Despite the great efforts made to culture immature ovules or embryos, few hybrid offspring have been obtained. In this study, gynophores from Arachis hypogaea L. pollinated with A. glabrata Benth. were cultured and F1 hybrids seeds were harvested, and F2 and F3 generations produced. The characters of F2 generation exhibited a wide range of segregation. Leaf peroxidase isozyme PAGE analysis revealed that the hybrids were quite different from their parents in relation to band number, width and isozyme activity. The zymograms of the hybrids and their parents were partially alike. This verified the authenticity of the hybrids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025613
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