A Mechanism for Nuclear Positioning in Fission Yeast Based on Microtubule Pushing Export

@article{citeulike:1360783, abstract = {The correct positioning of the nucleus is often important in defining the spatial organization of the cell, for example, in determining the cell division plane. In interphase Schizosaccharomyces pombe cells, the nucleus is positioned in the middle of the cylindrical cell in an active microtubule (MT)-dependent process. Here, we used green fluorescent protein markers to examine the dynamics of MTs, spindle pole body, and the nuclear envelope in living cells. We find that interphase MTs are organized in three to four antiparallel MT bundles arranged along the long axis of the cell, with MT plus ends facing both the cell tips and minus ends near the middle of the cell. The MT bundles are organized from medial MT-organizing centers that may function as nuclear attachment sites. When MTs grow to the cell tips, they exert transient forces produced by plus end MT polymerization that push the nucleus. After an average of 1.5 min of growth at the cell tip, MT plus ends exhibit catastrophe and shrink back to the nuclear region before growing back to the cell tip. Computer modeling suggests that a balance of these pushing MT forces can provide a mechanism to position the nucleus at the middle of the cell. 10.1083/jcb.153.2.397}, author = {Tran, P. T. and Marsh, L. and Doye, V. and Inoue, S. and Chang, F.}, citeulike-article-id = {1360783}, citeulike-linkout-0 = {http://dx.doi.org/10.1083/jcb.153.2.397}, citeulike-linkout-1 = {http://www.jcb.org/cgi/content/abstract/153/2/397}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/11309419}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=11309419}, day = {16}, doi = {10.1083/jcb.153.2.397}, journal = {J. Cell Biol.}, keywords = {mechanism, microtubules, nuclear, nucleus, pombe, positioning, pushing}, month = {April}, number = {2}, pages = {397--412}, posted-at = {2008-11-10 04:40:57}, priority = {2}, title = {A Mechanism for Nuclear Positioning in Fission Yeast Based on Microtubule Pushing}, url = {http://dx.doi.org/10.1083/jcb.153.2.397}, volume = {153}, year = {2001} }

TY - JOUR ID - citeulike:1360783 L3 - citeulike-article-id:1360783 N2 - The correct positioning of the nucleus is often important in defining the spatial organization of the cell, for example, in determining the cell division plane. In interphase Schizosaccharomyces pombe cells, the nucleus is positioned in the middle of the cylindrical cell in an active microtubule (MT)-dependent process. Here, we used green fluorescent protein markers to examine the dynamics of MTs, spindle pole body, and the nuclear envelope in living cells. We find that interphase MTs are organized in three to four antiparallel MT bundles arranged along the long axis of the cell, with MT plus ends facing both the cell tips and minus ends near the middle of the cell. The MT bundles are organized from medial MT-organizing centers that may function as nuclear attachment sites. When MTs grow to the cell tips, they exert transient forces produced by plus end MT polymerization that push the nucleus. After an average of 1.5 min of growth at the cell tip, MT plus ends exhibit catastrophe and shrink back to the nuclear region before growing back to the cell tip. Computer modeling suggests that a balance of these pushing MT forces can provide a mechanism to position the nucleus at the middle of the cell. 10.1083/jcb.153.2.397 IS - 2 JF - J. Cell Biol. EP - 412 TI - A Mechanism for Nuclear Positioning in Fission Yeast Based on Microtubule Pushing VL - 153 SP - 397 KW - mechanism KW - microtubules KW - nuclear KW - nucleus KW - pombe KW - positioning KW - pushing AU - Tran, PT AU - Marsh, L AU - Doye, V AU - Inoue, S AU - Chang, F PY - 2001/04/16/ UR - http://dx.doi.org/10.1083/jcb.153.2.397 ER -