TY - JOUR
T1 - Heterodimerization with LBP-1b is necessary for nuclear localization of LBP-1a and LBP-1c
AU - Sato, Fuyuhiko
AU - Yasumoto, Ken Ichi
AU - Kimura, Kota
AU - Numayama-Tsuruta, Keiko
AU - Sogawa, Kazuhiro
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/9
Y1 - 2005/9
N2 - The LBP-1 family consists of four proteins, which act as transcription factors in the formation of dimers with a member of this family. LBP-1a and LBP-1b are splicing variants from one gene, and LBP-1c and LBP-1d also arise from the alternative splicing of another gene. Investigation of subcellular localization of LBP-1 proteins fused to YFP revealed that the LBP-1b was localized in the nucleus, whereas LBP-1a and LBP-1c were exclusively localized in the cytosol. The peptide of 36 amino acids encoded by exon 6, a specific exon used only for LBP-1b, possessed the function of a nuclear localization signal (NLS). Nuclear localization of LBP-1a and LBP-1c occurred when LBP-1b was co-expressed, suggesting that heterodimerization of LBP-1a and LBP-1c with LBP-1b is important for their nuclear transport. Transiently expressed LBP-1 proteins in COS-7 cells formed speckles in the nucleus. Most speckles overlapped with the PML body. The activity of LBP-1a for accumulation in the PML body was mapped in the N-terminal region.
AB - The LBP-1 family consists of four proteins, which act as transcription factors in the formation of dimers with a member of this family. LBP-1a and LBP-1b are splicing variants from one gene, and LBP-1c and LBP-1d also arise from the alternative splicing of another gene. Investigation of subcellular localization of LBP-1 proteins fused to YFP revealed that the LBP-1b was localized in the nucleus, whereas LBP-1a and LBP-1c were exclusively localized in the cytosol. The peptide of 36 amino acids encoded by exon 6, a specific exon used only for LBP-1b, possessed the function of a nuclear localization signal (NLS). Nuclear localization of LBP-1a and LBP-1c occurred when LBP-1b was co-expressed, suggesting that heterodimerization of LBP-1a and LBP-1c with LBP-1b is important for their nuclear transport. Transiently expressed LBP-1 proteins in COS-7 cells formed speckles in the nucleus. Most speckles overlapped with the PML body. The activity of LBP-1a for accumulation in the PML body was mapped in the N-terminal region.
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U2 - 10.1111/j.1365-2443.2005.00884.x
DO - 10.1111/j.1365-2443.2005.00884.x
M3 - Article
C2 - 16115195
AN - SCOPUS:24344491109
VL - 10
SP - 861
EP - 870
JO - Genes to Cells
JF - Genes to Cells
SN - 1356-9597
IS - 9
ER -