Identification of a Karyopherin α2 Recognition Site in PLAG1, Which Functions As a Nuclear Localization Signal *
Journal of Biological Chemistry, ISSN: 0021-9258, Vol: 277, Issue: 22, Page: 19673-19678
2002
- 27Citations
- 14Captures
- 4Mentions
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Metrics Details
- Citations27
- Citation Indexes27
- 27
- CrossRef22
- Captures14
- Readers14
- 14
- Mentions4
- References4
- Wikipedia4
Article Description
The activation of the pleomorphic adenoma gene 1 ( PLAG1 ) is the most frequent gain-of-function mutation found in pleomorphic adenomas of the salivary glands. To gain more insight into the regulation of PLAG1 function, we searched for PLAG1-interacting proteins. Using the yeast two-hybrid system, we identified karyopherin α2 as a PLAG1-interacting protein. Physical interaction between PLAG1 and karyopherin α2 was confirmed by an in vitro glutathione S -transferase pull-down assay. Karyopherin α2 escorts proteins into the nucleus via interaction with a nuclear localization sequence (NLS) composed of short stretches of basic amino acids. Two putative NLSs were identified in PLAG1. The predicted NLS1 (KRKR) was essential for physical interaction with karyopherin α2 in glutathione S -transferase pull-down assay, and its mutation resulted in decreased nuclear import of PLAG1. Moreover, NLS1 was able to drive the nuclear import of the cytoplasmic protein β-galactosidase. In contrast, predicted NLS2 of PLAG1 (KPRK) was not involved in karyopherin α2 binding nor in its nuclear import. The residual nuclear import of PLAG1 after mutation of the NLS1 was assigned to the zinc finger domain of PLAG1. These observations indicate that the nuclear import of PLAG1 is governed by its zinc finger domain and by NLS1, a karyopherin α2 recognition site.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0021925820850315; http://dx.doi.org/10.1074/jbc.m112112200; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0037205419&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/11882654; https://linkinghub.elsevier.com/retrieve/pii/S0021925820850315; http://www.jbc.org/lookup/doi/10.1074/jbc.M112112200; https://syndication.highwire.org/content/doi/10.1074/jbc.M112112200; https://dx.doi.org/10.1074/jbc.m112112200
Elsevier BV
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