期刊
FEBS LETTERS
卷 593, 期 1, 页码 107-118出版社
WILEY
DOI: 10.1002/1873-3468.13288
关键词
early growth response; NGFI-A-binding protein; nuclear localization signal
资金
- Department of Biological Sciences at Bridgewater State University
- Adrian Tinsley Program for Undergraduate Research at Bridgewater State University
NAB1 and 2 are coregulators for early growth response (Egr) transcription factors. The NAB1 nuclear localization signal (NLS) was previously described as a bipartite NLS of sequence R(X-2)K(X-11)KRXK. The sequence is conserved in NAB2 as K(X-2)R(X-11)KKXK; however, whether it functions as the NAB2 NLS has not been tested. We show that the KKXK motif in NAB2 is necessary and sufficient to mediate nuclear localization. Mutation of the KKXK motif to AAXA causes cytoplasmic localization of NAB2, while Lys/Arg-to-Ala mutations of the upstream K(X-2)R motif have no effect. Fusion of the KKXK motif to cytoplasmic protein eIF2B epsilon causes nuclear localization. Altogether, this study refines our knowledge of the NAB2 NLS, demonstrating that KKXK343-346 is necessary and sufficient for nuclear localization.
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