Hay-Oak Park
Professor
226 Biological Sciences Building
484 West 12th Avenue
Columbus, OH
43210-1292
Areas of Expertise
- Cell Polarity and Asymmetry
- Cellular Aging
- Stress Response and Cell Death
Living cells are often polarized with a distinct front and back or top and bottom. Cell asymmetry and polarity are critical for cell proliferation and development. Indeed, the loss of cell polarity and asymmetry has been implicated in many diseases including cancer and cellular aging. Our current research has two main focuses: 1) spatial and temporal regulation of cell polarization; and 2) regulation of cellular lifespan. Some of our recent work is highlighted below.
Spatial and Temporal Control of Cell Polarity
Biphasic activation of the Cdc42 GTPase in G1 (Kang et al., J Cell Biol 2014; see also– “In This Issue” of the J Cell Biol. July 7, 2014)
Dynamics of Bem1-GFP at the division site at two temporal steps in the G1 phase in wild type and rsr1 mutants (Miller et al. 2019 Mol Biol Cell)
Modeling and simulations of Cdc42 polarization in wild type and rsr1 mutants. Miller et al. (2019) Mol Biol Cell 15; 30(20): 2543-2557. https://www.molbiolcell.org/doi/full/10.1091/mbc.E19-02-0106?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed
Cellular Aging and Stress Response
Most eukaryotic cells are constantly exposed to reactive oxygen species (ROS), which are produced as byproducts of metabolism and upon exposure to diverse environmental stresses. The increased production of ROS also leads to the induction of defense mechanisms to avoid molecular damage, but the redox balance is disturbed under excessive stress. We discovered that the Rho5 GTPase is necessary for apoptotic cell death induced by oxidants (Singh et al., PNAS 2008). We investigate how asymmetric cell division and cell polarity are involved in maintaining cellular damage in mother cells and what limits cellular lifespan.
A microfluidics-based imaging platform to image yeast cells for their entire lifetime. A single “trap” with a yeast cell expressing red and green fluorescent protein is enlarged. From P. J. Kang & H.-O. Park.
The screen of VN fusion library for Rho5 interacting proteins by bimolecular fluorescence complementation (BiFC) assays. Singh et al. (2019) G3, 7;9(3):921-931. https://www.g3journal.org/content/9/3/921.long
SELECTED PUBLICATIONS since 2007 (*Corresponding Author):
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Kang, P. J., R. Mullner, K. Lian, H.-O. Park* (2023). Cdc42 couples septin recruitment to the axial landmark assembly via Axl2 in budding yeast. J Cell Sci. 2023 Sep 15;. doi: 10.1242/jcs.261080. [Epub ahead of print] PMID: 37712304.
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Liu, Y., J. Xie, H.-O. Park, W.-C. Lo* (2023). Mathematical modeling of cell polarity establishment of budding Yeast. Commun. Appl. Math. Comput.. 2023 February. doi: https://doi.org/10.1007/s42967-022-00240-y.
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Kang, P. J., R. Mullner, H. Li, D. Hansford, H. W. Shen, and H.-O. Park* (2022) Upregulation of the Cdc42 GTPase limits the replicative lifespan of budding yeast. Mol Biol Cell. 2022 Jan 19: Online ahead of print. PMID: 35044837
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Miller, K. E., P. J. Kang, and H.-O. Park* (2020) Regulation of Cdc42 for polarized growth in budding yeast. Microb Cell. 2020 May 19;7(7):175-189. PMID: 32656257. https://pubmed.ncbi.nlm.nih.gov/32656257/
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Miller, K. E., W.-C. Lo, C.-S. Chou, and H.-O. Park* “Temporal regulation of cell polarity via the interaction of the Ras GTPase Rsr1 and the scaffold protein Bem1”. Mol Biol Cell. (2019) Epub 2019 Aug 14.
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Singh, K., M.E. Lee, M. Entezari, C.-H. Jung, Y. Kim, Y. Park, J. D. Fioretti, W.-K. Huh*, H.-O. Park* and P. J. Kang* (2019) Genome-Wide Studies of Rho5-Interacting Proteins That Are Involved in Oxidant-Induced Cell Death in Budding Yeast. G3 (Genes/Genomes/Genetics), Epub 2019 Jan 22.
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Kang, P. J., K. E. Miller, J. Guegueniat, L. Beven, and H.-O. Park* (2018) The shared role of the Rsr1 GTPase and Gic1/Gic2 in Cdc42 polarization. Mol Biol Cell. 2018 Oct 1;29(20):2359-2369. doi: 10.1091/mbc.E18-02-0145. Epub 2018 Aug 9.
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Carmona-Gutiérrez, D.* et al., …… H.-O. Park, ….…, F. Madeo* (2018) “Guidelines and recommendations on yeast cell death nomenclature” Microb Cell. 2018 Jan 1; 5(1): 4–31.
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Miller, K. E., W.-C. Lo, M.E. Lee, P. J. Kang, and H.-O. Park* (2017) “Fine-tuning the orientation of the polarity axis by Rga1, a Cdc42 GTPase activating protein”,Mol Biol Cell. 2017 Dec 15;28(26):3773-3788. Epub 2017 Oct 26.
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Okada, S., M. E. Lee, E. Bi E, H.-O. Park* (2017) Probing Cdc42 Polarization Dynamics in Budding Yeast Using a Biosensor. Methods Enzymol. 2017;589:171-190. Epub 2017 Feb 20.
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Lee, M. E.@, W.-C Lo@, K. E. Miller, C.-S. Chou, and H.-O. Park* (2015) Regulation of Cdc42 polarization by the Rsr1 GTPase and Rga1, a Cdc42 GTPase activating protein, in budding yeast. J Cell Sci 128: 2106-2117 (@ equal contribution)
Highlighted in “In This Issue” of the J Cell Sci 2015 128:e1103: -
Miller, K. E., Y. Kim, W.-K. Huh, and H.-O. Park* (2015) Bimolecular Fluorescence Complementation (BiFC Analysis): advances and recent applications for genome-wide interaction studies J Mol Biol [2015 Mar 12; Epub ahead of print] — invited review
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Lam, M. H. Y., J. Snider1, M. Rehal, V. Wong, F. Aboualizadeh, L. Drecun, O. Wong, B. Jubran, M. Li, M. Ali, M. Jessulat; V. Dieneko, R. Miller, M. E. Lee, H.-O. Park, A. Davidson, M. Babu, and I. Stagljar* (2015) A comprehensive membrane interactome mapping of Sho1p reveals Fps1p as a novel key player in the regulation of the HOG Pathway in S. cerevisiae. J Mol Biol [2015 Jan 30; Epub ahead of print]
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Kang, P.J., M.E. Lee, and H.-O. Park* (2014) Bud3 activates Cdc42 to establish a proper growth site in budding yeast. J Cell Biol 206: 19 - 28. Highlighted in “In This Issue” of the J Cell Biol.
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Lo, W.-C.*, H.-O. Park, and C.-S. Chou (2014) Mathematical Analysis of Spontaneous Emergence of Cell Polarity Bull. Math. Biol. 76(8): 1835-65.
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Snider, J., A. Hanif, M. E. Lee, K. Jin, A. R Yu, C. Graham, M. Chuk, D. Damjanovic, M. Wierzbicka, P. Tang, D. Balderes, V. Wong, M. Jessulat, K. D. Darowski, B.-J. San Luis, I. Shevelev, S. L. Sturley, C. Boone, J. F. Greenblatt, Z. Zhang, C. M. Paumi, M. Babu, H.-O. Park, S. Michaelis, and I. Stagljar* (2013) Mapping the functional yeast ABC transporter interactome. Nature Chem Biol. 9(9):565-72 [Epub 2013 Jul 7].
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Lo, W.-C. #,M. Lee#,M. Narayan,C.-S. Chou,and H.-O. Park* (2013) Polarization of diploid daughter cells directed by spatial cues and GTP hydrolysis of Cdc42 in budding yeast. PLoS ONE 8(2):e56665. [Epub 2013 Feb 20]; #equal contribution to the work.
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Kang, P. J., J. K. Hood-DeGrenier, and H.-O. Park* (2013) Coupling of septins to the axial landmark by Bud4 in budding yeast. J Cell Sci. 126:1218-26 [Epub 2013 Jan 23].
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Bi, E. and H.-O. Park (2012) Cell polarization and cytokinesis in budding yeast. Genetics 191: 347-387.
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Nelson, S. A., A. M. Sanson, H.-O. Park, and J. A. Cooper* (2012) A novel role for the GTPase activating protein Bud2 in the spindle position checkpoint. PLoS ONE 7(4): e36127.
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Kang, P. J., E. Angerman, C.-H. Jung, and H.-O. Park* (2012) Bud4 mediates the cell-type-specific assembly of the axial landmark in budding yeast. J Cell Sci. 125:3840-9
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Lee ME, Singh K, Snider J, Shenoy A, Paumi CM, Stagljar I, Park HO* (2011) The Rho1 GTPase Acts Together With a Vacuolar Glutathione S-conjugate Transporter to Protect Yeast Cells from Oxidative Stress. Genetics. 188(4):859-70.
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Kang, P. J., L. Beven, S. Hariharan and H.-O. Park* (2010) The Rsr1/Bud1 GTPase interacts with itself and the Cdc42 GTPase during bud-site selection and polarity establishment in budding yeast. Mol. Biol. Cell 21: 3007-3016.
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Kozminski, K. G. and Park, H.-O.* (2009) Yeast small G protein function: Molecular basis of cell polarity in yeast, in Handbook of Cell Signaling, Second Ed., eds. R. A. Bradshaw & E. A. Dennis, Vol. 2, pp. 1813-1817, Academic Press, Elsevier Inc.
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Singh, K., P. J. Kang, and H.-O. Park* (2008) The Rho5 GTPase is necessary for oxidant-induced cell death in budding yeast. Proc. Natl. Acad. Sci. USA 105: 1522-1527
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Park, H.-O.* and E. Bi (2007) Central roles of small GTPases in the development of cell polarity in yeast and beyond. Microbiology & Molecular Biology Reviews, 71: 48-96