Identification of an unconventional nuclear localization signal in human ribosomal protein S2
- Institute of Clinical Chemistry and Pathobiochemistry, RWTH Aachen, (Germany)
- Department for Plastic, Hand and Reconstructive Surgery, Medical School Hannover, Podbielskistrasse 380, D-30659 Hannover, (Germany)
Ribosomal proteins must be imported into the nucleus after being synthesized in the cytoplasm. Since the rpS2 amino acid sequence does not contain a typical nuclear localization signal, we used deletion mutant analysis and rpS2-{beta}-galactosidase chimeric proteins to identify the nuclear targeting domains in rpS2. Nuclear rpS2 is strictly localized in the nucleoplasm and is not targeted to the nucleoli. Subcellular localization analysis of deletion mutants of rpS2-{beta}-galactosidase chimeras identified a central domain comprising 72 amino acids which is necessary and sufficient to target the chimeric {beta}-galactosidase to the nucleus. The nuclear targeting domain shares no significant similarity to already characterized nuclear localization signals in ribosomal proteins or other nuclear proteins. Although a Nup153 fragment containing the importin{beta} binding site fused to VP22 blocks nuclear import of rpS2-{beta}-galactosidase fusion proteins, nuclear uptake of rpS2 could be mediated by several import receptors since it binds to importin{alpha}/{beta} and transportin.
- OSTI ID:
- 20710968
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 335, Issue 1; Other Information: DOI: 10.1016/j.bbrc.2005.07.069; PII: S0006-291X(05)01514-7; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mapping of nuclear import signal and importin {alpha}3 binding regions of 52K protein of bovine adenovirus-3
Localization of the importin-{beta} gene to mouse chromosome 11D and rat chromosome 10q32.1