Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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The I/LWEQ Domain in RapGAP3 Required for Posterior Localization in Migrating Cells

  • Lee, Mi-Rae (Department of Biology and Brain Korea 21- Plus Research Team for Bioactive Control Technology, College of Natural Sciences, Chosun University) ;
  • Kim, Hyeseon (Department of Biology and Brain Korea 21- Plus Research Team for Bioactive Control Technology, College of Natural Sciences, Chosun University) ;
  • Jeon, Taeck J. (Department of Biology and Brain Korea 21- Plus Research Team for Bioactive Control Technology, College of Natural Sciences, Chosun University)
  • Received : 2013.10.29
  • Accepted : 2013.12.09
  • Published : 2014.04.30
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Abstract

Cell migration requires a defined cell polarity which is formed by diverse cytoskeletal components differentially localized to the poles of cells to extracellular signals. Rap-GAP3 transiently and rapidly translocates to the cell cortex in response to chemoattractant stimulation and localizes to the leading edge of migrating cells. Here, we examined localization of truncated RapGAP3 proteins and found that the I/LWEQ domain in the central region of RapGAP3 was sufficient for posterior localization in migrating cells, as opposed to leading-edge localization of full-length Rap-GAP3. All truncated proteins accumulated at the leading edge of migrating cells exhibited clear translocation to the cell cortex in response to stimulation, whereas proteins localized to the posterior in migrating cells displayed no translocation to the cortex. The I/LWEQ domain appears to passively accumulate at the posterior region in migrating cells due to exclusion from the extended front region in response to chemoattractant stimulation rather than actively being localized to the back of cells. Our results suggest that posterior localization of the I/LWEQ domain of RapGAP3 is likely related to F-actin, which has probably different properties compared to newly formed F-actin at the leading edge of migrating cells, at the lateral and posterior regions of the cell.

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References

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