Abstract
We previously reported that the nuclear localization signal (NLS) peptides stimulate the in vitro phosphorylation of several proteins, including a 34 kDa protein. In this study, we show that this specific 34 kDa protein is a novel murine leucine-rich acidic nuclear protein (LANP)-like large protein (mLANP-L). mLANP-L was found to have a basic type NLS. The co-injection of Q69LRan-GTP or SV40 T-antigen NLS peptides prevented the nuclear import of mLANP-L. mLANP-L NLS bound preferentially to Rch1 and NPI-1, but not to the Qip1 subfamily of importin α. These findings suggest that mLANP-L is transported into the nucleus by Rch1 and/or NPI-1.
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