cDNA cloning of nuclear localization signal binding protein NBP60, a rat homologue of lamin B receptor, and identification of binding sites of human lamin B receptor for nuclear localization signals and chromatin

Journal of Biochemistry
S KawahireTsuneyoshi Horigome

Abstract

We previously purified and characterized a nuclear localization signal (NLS) binding protein, NBP60, in rat liver nuclear envelopes. In this study, we cloned and sequenced the cDNA of rat NBP60, and predicted an amino acid sequence comprising 620 amino acids. The sequence revealed that NBP60 is a rat homologue of lamin B receptor (LBR), and is 79 and 63% identical in amino acids to human and chicken LBR, respectively. Using three fusion proteins containing different parts of the amino-terminal domain of human LBR, it was shown that the stretch comprising amino acids 1 to 89, which contains a Ser-Arg rich region (RS region), binds to nucleoplasmin and that the binding was inhibited by a common NLS-peptide. These results suggested that the amino-terminal domain of LBR contains an NLS-binding site. Furthermore, it was shown that the stretch comprising amino acids 1 to 53, which does not contain the RS region or the predicted DNA-binding site, binds to Xenopus laevis sperm chromatin.

Citations

Jan 25, 2007·Chromosoma·Katrin HoffmannDonald E Olins
Feb 16, 2002·European Journal of Biochemistry·Makoto TakanoTsuneyoshi Horigome
Jul 1, 2005·Protein Science : a Publication of the Protein Society·Béatrice Alpha-BazinEric Quéméneur
Oct 27, 2004·Molecular and Biochemical Parasitology·Laurence VayssiéNancy Guillén
Feb 18, 2011·Nucleus·Ada L OlinsDonald E Olins
Sep 2, 1998·Journal of Structural Biology·N StuurmanU Aebi
Jan 12, 1999·FEBS Letters·A ChuU Stochaj
Jun 26, 2003·The Journal of Biological Chemistry·Kuniyoshi IwabuchiAidan J Doherty
Mar 26, 2003·The Journal of Biological Chemistry·Tomoaki NakagawaTsuneyoshi Horigome
Apr 1, 2004·Journal of Cell Science·Nicole WagnerGeorg Krohne
Jun 9, 2006·European Journal of Cell Biology·Kristina Schild-PrüfertGeorg Krohne

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