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A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function

  • Authors:
    • Jiong Li
    • Fengming Wu
    • Longfei Cheng
    • Jiaqi Zhang
    • Caihui Cha
    • Li Chen
    • Taoshan Feng
    • Jifeng Zhang
    • Guoqing Guo
  • View Affiliations / Copyright

    Affiliations: Department of Anatomy, Neuroscience Laboratory for Cognitive and Developmental Disorders, Medical College of Jinan University, Guangzhou, Guangdong 510632, P.R. China
    Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 2367-2374
    |
    Published online on: March 26, 2020
       https://doi.org/10.3892/mmr.2020.11040
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Abstract

It is commonly known that the specific function of a given ATPase associated with diverse cellular activities protein (i.e., a member of the AAA superfamily of proteins) depends primarily on its subcellular location. The microtubule‑severing protein fidgetin (Fign) possesses a nuclear localization signal (NLS) that facilitates its translocation to the nucleus, where its assembly is finalized; here, Fign contributes to the regulation of microtubule configuration by cutting and trimming microtubule polymers. In the present study, Fign was found to be a nuclear protein, whose N‑terminal sequence (SSLKRKAFYM; residues 314‑323) acts as an NLS. Following substitution (KR to NN; 317‑318) or deletion (NT; 314‑323) mutations within the NLS, Fign, which is predominantly expressed in the nucleus, was found to reside in the cytoplasm of transfected cells. Furthermore, Fign was found to have an essential role in microtubule severing by preferentially targeting highly‑tyrosinated microtubules (tyr‑MTs). Mutation of the Fign NLS did not affect its microtubule‑severing function or the cleavage of tyr‑MTs, but did affect the cellular distribution of the Fign protein itself. Taken altogether, an NLS for Fign was identified, and it was demonstrated that the basic amino acids K317 and R318 are necessary for regulating its entry into the nucleus, whereas an increase in Fign in the cytosol due to mutations of the NLS did not affect its cleavage function.
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Copy and paste a formatted citation
Spandidos Publications style
Li J, Wu F, Cheng L, Zhang J, Cha C, Chen L, Feng T, Zhang J and Guo G: A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function. Mol Med Rep 21: 2367-2374, 2020.
APA
Li, J., Wu, F., Cheng, L., Zhang, J., Cha, C., Chen, L. ... Guo, G. (2020). A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function. Molecular Medicine Reports, 21, 2367-2374. https://doi.org/10.3892/mmr.2020.11040
MLA
Li, J., Wu, F., Cheng, L., Zhang, J., Cha, C., Chen, L., Feng, T., Zhang, J., Guo, G."A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function". Molecular Medicine Reports 21.6 (2020): 2367-2374.
Chicago
Li, J., Wu, F., Cheng, L., Zhang, J., Cha, C., Chen, L., Feng, T., Zhang, J., Guo, G."A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function". Molecular Medicine Reports 21, no. 6 (2020): 2367-2374. https://doi.org/10.3892/mmr.2020.11040
Copy and paste a formatted citation
x
Spandidos Publications style
Li J, Wu F, Cheng L, Zhang J, Cha C, Chen L, Feng T, Zhang J and Guo G: A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function. Mol Med Rep 21: 2367-2374, 2020.
APA
Li, J., Wu, F., Cheng, L., Zhang, J., Cha, C., Chen, L. ... Guo, G. (2020). A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function. Molecular Medicine Reports, 21, 2367-2374. https://doi.org/10.3892/mmr.2020.11040
MLA
Li, J., Wu, F., Cheng, L., Zhang, J., Cha, C., Chen, L., Feng, T., Zhang, J., Guo, G."A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function". Molecular Medicine Reports 21.6 (2020): 2367-2374.
Chicago
Li, J., Wu, F., Cheng, L., Zhang, J., Cha, C., Chen, L., Feng, T., Zhang, J., Guo, G."A nuclear localization signal is required for the nuclear translocation of Fign and its microtubule‑severing function". Molecular Medicine Reports 21, no. 6 (2020): 2367-2374. https://doi.org/10.3892/mmr.2020.11040
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