Xenopus LAP2[beta] protein knockdown affects location of lamin B and nucleoporins and has effect on assembly of cell nucleus and cell viability
Issue Title: Special Issue on Cell Biology in Agricultural and Food Science Xenopus LAP2[beta] protein is the single isoform expressed in XTC cells. The protein localizes on heterochromatin clusters both at the nuclear envelope and inside a cell nucleus. The majority of XLAP2[beta] fraction neither...
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Veröffentlicht in: | Protoplasma 2016-05, Vol.253 (3), p.943 |
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description | Issue Title: Special Issue on Cell Biology in Agricultural and Food Science Xenopus LAP2[beta] protein is the single isoform expressed in XTC cells. The protein localizes on heterochromatin clusters both at the nuclear envelope and inside a cell nucleus. The majority of XLAP2[beta] fraction neither colocalizes with TPX2 protein during interphase nor can be immunoprecipitated with XLAP2[beta] antibody. Knockdown of the XLAP2[beta] protein expression in XTC cells by synthetic siRNA and plasmid encoded siRNA resulted in nuclear abnormalities including changes in shape of nuclei, abnormal chromatin structure, loss of nuclear envelope, mislocalization of integral membrane proteins of INM such as lamin B2, mislocalization of nucleoporins, and cell death. Based on timing of cell death, we suggest mechanism associated with nucleus reassembly or with entry into mitosis. This confirms that Xenopus LAP2 protein is essential for the maintenance of cell nucleus integrity and the process of its reassembly after mitosis. |
doi_str_mv | 10.1007/s00709-015-0861-y |
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The protein localizes on heterochromatin clusters both at the nuclear envelope and inside a cell nucleus. The majority of XLAP2[beta] fraction neither colocalizes with TPX2 protein during interphase nor can be immunoprecipitated with XLAP2[beta] antibody. Knockdown of the XLAP2[beta] protein expression in XTC cells by synthetic siRNA and plasmid encoded siRNA resulted in nuclear abnormalities including changes in shape of nuclei, abnormal chromatin structure, loss of nuclear envelope, mislocalization of integral membrane proteins of INM such as lamin B2, mislocalization of nucleoporins, and cell death. Based on timing of cell death, we suggest mechanism associated with nucleus reassembly or with entry into mitosis. 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The protein localizes on heterochromatin clusters both at the nuclear envelope and inside a cell nucleus. The majority of XLAP2[beta] fraction neither colocalizes with TPX2 protein during interphase nor can be immunoprecipitated with XLAP2[beta] antibody. Knockdown of the XLAP2[beta] protein expression in XTC cells by synthetic siRNA and plasmid encoded siRNA resulted in nuclear abnormalities including changes in shape of nuclei, abnormal chromatin structure, loss of nuclear envelope, mislocalization of integral membrane proteins of INM such as lamin B2, mislocalization of nucleoporins, and cell death. Based on timing of cell death, we suggest mechanism associated with nucleus reassembly or with entry into mitosis. 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title | Xenopus LAP2[beta] protein knockdown affects location of lamin B and nucleoporins and has effect on assembly of cell nucleus and cell viability |
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