Researcher:
Mollaoğlu, Gürkan

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Master Student

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Gürkan

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Mollaoğlu

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Mollaoğlu, Gürkan

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2015 - 20202

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Researcher Of Publications: search.filters.isAuthorOfPublication.8b1bed98-2634-432a-85d7-7297a572b77f

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    Quantitative comparison of a human cancer cell surface proteome between interphase and mitosis
    (Wiley, 2015) Toyoda, Yusuke; Renard, Bernhard Y.; Mollaoglu, Gurkan; Poser, Ina; Timm, Wiebke; Hyman, Anthony A.; Mitchison, Timothy J.; Steen, Judith A.; Department of Molecular Biology and Genetics; N/A; N/A; N/A; N/A; Qureshi, Mohammad Haroon; Mollaoğlu, Gürkan; Küçük, Nazlı Ezgi Özkan; Bülbül, Selda; Faculty Member; PhD Student; Master Student; Researcher; Master Student; Department of Molecular Biology and Genetics; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); College of Sciences; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; N/A; Graduate School of Sciences and Engineering; 105301; N/A; N/A; N/A; N/A
    The cell surface is the cellular compartment responsible for communication with the environment. The interior of mammalian cells undergoes dramatic reorganization when cells enter mitosis. These changes are triggered by activation of the CDK1 kinase and have been studied extensively. In contrast, very little is known of the cell surface changes during cell division. We undertook a quantitative proteomic comparison of cell surface-exposed proteins in human cancer cells that were tightly synchronized in mitosis or interphase. Six hundred and twenty-eight surface and surface-associated proteins in HeLa cells were identified; of these, 27 were significantly enriched at the cell surface in mitosis and 37 in interphase. Using imaging techniques, we confirmed the mitosis-selective cell surface localization of protocadherin PCDH7, a member of a family with anti-adhesive roles in embryos. We show that PCDH7 is required for development of full mitotic rounding pressure at the onset of mitosis. Our analysis provided basic information on how cell cycle progression affects the cell surface. It also provides potential pharmacodynamic biomarkers for anti-mitotic cancer chemotherapy.
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    PublicationOpen Access
    CLIC4 and CLIC1 bridge plasma membrane and cortical actin network for a successful cytokinesis
    (Life Science Alliance LLC, 2020) Department of Molecular Biology and Genetics; Kagiali, Zeynep Cansu Üretmen; Şanal, Erdem; Değirmenci, Beste Senem; Mollaoğlu, Gürkan; Saner, Nazan; Master Student; Faculty Member; Researcher; Department of Molecular Biology and Genetics; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A; N/A; 105301; 227757
    CLIC4 and CLIC1 are members of the well-conserved chloride intracellular channel proteins (CLICs) structurally related to glutathione-S-transferases. Here, we report new roles of CLICs in cytokinesis. At the onset of cytokinesis, CLIC4 accumulates at the cleavage furrow and later localizes to the midbody in a RhoA-dependent manner. The cell cycle-dependent localization of CLIC4 is abolished when its glutathione S-transferase activity-related residues (C35A and F37D) are mutated. Ezrin, anillin, and ALIX are identified as interaction partners of CLIC4 at the cleavage furrow and midbody. Strikingly, CLIC4 facilitates the activation of ezrin at the cleavage furrow and reciprocally inhibition of ezrin activation diminishes the translocation of CLIC4 to the cleavage furrow. Furthermore, knockouts of CLIC4 and CLIC1 cause abnormal blebbing at the polar cortex and regression of the cleavage furrow at late cytokinesis leading to multinucleated cells. We conclude that CLIC4 and CLIC1 function together with ezrin where they bridge plasma membrane and actin cytoskeleton at the polar cortex and cleavage furrow to promote cortical stability and successful completion of cytokinesis in mammalian cells.