File:Nuclear proteins during mitosis.jpg
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Integral Membrane Proteins of the Nuclear Envelope Are Dispersed throughout the Endoplasmic Reticulum during Mitosis
Model depicting the dynamics of integral membrane proteins of the NE during mitosis. The interphase NE is morphologically continuous with the peripheral ER but is a specialized ER subcompartment that contains integral membrane proteins specific to the inner nuclear membrane (top) and nuclear pore membrane (not shown). Integral proteins of the inner nuclear membrane may be bound to lamins, lamina-associated proteins, or chromatin. During mitosis when the NE is disassembled, integral membrane proteins of the NE are dispersed throughout all ER membranes, and the NE loses its identity as an ER subcompartment (middle). We propose that integral proteins are resorted to the NE during late anaphase by diffusion through a functionally continuous ER and subsequent association with binding sites at the chromosomes (bottom). The binding sites for inner membrane proteins may include lamins and chromatin (bottom); those for nuclear pore membrane proteins may include other pore complex components (not shown). These binding interactions would result in the net collection of nuclear membrane proteins at the reforming NE (bottom, arrows). Reformation of the NE may involve cooperative assembly of lamins and integral membrane proteins of the inner nuclear membrane (bottom).
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|current||19:40, 28 May 2013||597 × 1,199 (180 KB)||Z3331556||Original file name: JCB.14511f6.jpg Integral Membrane Proteins of the Nuclear Envelope Are Dispersed throughout the Endoplasmic Reticulum during Mitosis http://www.ncbi.nlm.nih.gov.wwwproxy0.library.unsw.edu.au/pmc/articles/PMC2132536/ Model depicti...|