Trafficking between the nucleus and cytoplasm of the eukaryotic cell is an essential process and a key regulatory point in many cellular functions. The nuclear pore complex is the mediator of all nucleocytoplasmic transport and the precise function of this structure remains a fundamental question in cell biology. Remarkable strides have been made in our knowledge of the nuclear pore and nuclear trafficking over the past decade. Additionally, new paradigms are emerging for the nuclear pore complex, including the surprisingly dynamic nature of this macromolecular structure and unexpected roles for nuclear pore proteins at other sites during mitosis. One component of the nuclear pore, Nup98, serves as a model nucleoporin through which multiple aspects of nuclear pore function can be addressed. The long term goal of the proposed research is an understanding of how nuclear pore complex function is regulated and integrated with other cellular processes. Such integration is particularly relevant for Nup98 which is a target of chromosomal translocations in myelogenous leukemia. It is hypothesized in this proposal that Nup98 serves as a key regulator of nuclear trafficking and nuclear pore function. The specific goals of this proposal are directed at defining the critical interactions through which this nucleoporin contributes to nuclear export and to the structural organization of the nuclear pore complex. Using a combination of biochemical and molecular techniques, live cell dynamics and the Xenopus extract reconstitution system, the intranuclear functions of this dynamic nucleoporin will be assessed and the mechanism coupling nucleoporin dynamics to ongoing transcription will be determined. Further, the role of phosphorylation in regulating the interactions between Nup98 and other nucleoporins will be addressed. Lastly, possible contributions of Nup98 to mitotic functions following disassembly of the nuclear pore complex will be assessed. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM059975-08
Application #
7440238
Study Section
Special Emphasis Panel (ZRG1-CB-B (03))
Program Officer
Shapiro, Bert I
Project Start
1999-08-01
Project End
2010-05-31
Budget Start
2008-06-01
Budget End
2009-05-31
Support Year
8
Fiscal Year
2008
Total Cost
$309,966
Indirect Cost
Name
Emory University
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
066469933
City
Atlanta
State
GA
Country
United States
Zip Code
30322
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Chow, Kin-Hoe; Elgort, Suzanne; Dasso, Mary et al. (2014) The SUMO proteases SENP1 and SENP2 play a critical role in nucleoporin homeostasis and nuclear pore complex function. Mol Biol Cell 25:160-8
Xu, Songli; Powers, Maureen A (2013) In vivo analysis of human nucleoporin repeat domain interactions. Mol Biol Cell 24:1222-31
Chatel, Guillaume; Desai, Sachin H; Mattheyses, Alexa L et al. (2012) Domain topology of nucleoporin Nup98 within the nuclear pore complex. J Struct Biol 177:81-9
Cross, Marie K; Powers, Maureen A (2011) Nup98 regulates bipolar spindle assembly through association with microtubules and opposition of MCAK. Mol Biol Cell 22:661-72
Xu, Songli; Powers, Maureen A (2010) Nup98-homeodomain fusions interact with endogenous Nup98 during interphase and localize to kinetochores and chromosome arms during mitosis. Mol Biol Cell 21:1585-96
Xu, Songli; Powers, Maureen A (2009) Nuclear pore proteins and cancer. Semin Cell Dev Biol 20:620-30
Ratner, Gary A; Hodel, Alec E; Powers, Maureen A (2007) Molecular determinants of binding between Gly-Leu-Phe-Gly nucleoporins and the nuclear pore complex. J Biol Chem 282:33968-76
Paulillo, Sara M; Powers, Maureen A; Ullman, Katharine S et al. (2006) Changes in nucleoporin domain topology in response to chemical effectors. J Mol Biol 363:39-50
Paulillo, Sara M; Phillips, Erica M; Koser, Joachim et al. (2005) Nucleoporin domain topology is linked to the transport status of the nuclear pore complex. J Mol Biol 351:784-98

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