Abstract
Proteins anchor to the nucleolus because of a retardation of their movement by transient binding to nucleolar constituents. It is achieved due to a targeting signal present in the anchored protein that interacts with target constituents in the nucleolus. Critical targets are rDNA, pre-rRNA and key proteins that usually appear early during formation of the nucleolus. Residents of the nucleolus form a net of interactions that includes hub proteins serving as platforms for binding other ones. In several cases anchoring is regulated by posttranslational modifications (e.g. nucleophosmin), GTP binding (nucleostemin), enzymatic activity (DNA topoisomerase I), stress conditions (Hsc70) or cellular pH (von Hippel-Lindau tumor suppressor). Several proteins use more than one mechanism to anchor to the nucleolus (e.g. DNA topoisomerase I).
Impairment of basic nucleolar processes like pre-rRNA synthesis or processing by DNA damage or inhibitors leads to translocation of numerous proteins and in effect to nucleolar reorganization. Ordered translocations of nucleolar proteins occur during disassembly and reassembly of the nucleolus in the course of mitosis. A specific sequence of translocations activated in a chain of events (that initially removes DNA topoisomerase I from the nucleoli) is observed in cells treated with camptothecin.
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- Cdk:
-
Cyclin dependent kinase
- CPT:
-
Camptothecin
- DFC:
-
Dense fibrillar component
- DRB:
-
5,6-dichloro-1-β-D-ribofuranosylbenzimidazole
- FC:
-
Fibrillar center
- GAR:
-
Glycine- and arginine-rich
- GC:
-
Granular component
- HMG:
-
High mobility group
- IR:
-
Ionizing radiation
- MNNG:
-
N-methyl-N’-nitro-N-nitrosoguanidine
- mTOR:
-
Mammalian target of rapamycin kinase
- NLS:
-
Nuclear localization signal
- NoDSH+ :
-
Nucleolar detention signal regulated by H+
- NoLS:
-
Nucleolar localization signal
- NOR:
-
Nucleolar organization region
- Pol I (II, III):
-
RNA polymerase I (II, III)
- PTM:
-
Posttranslational modifications
- rDNA:
-
Ribosomal DNA
- RNP:
-
Ribonucleoprotein
- RP:
-
Ribosomal protein
- RRM:
-
RNA-recognition motif
- snoRNA:
-
Small nucleolar RNA
- SSU:
-
Small subunit
- Topo I:
-
DNAtopoisomerase I
- TTF:
-
Transcription termination factor
- UBF:
-
Upstream binding factor
- VHL:
-
Von Hippel-Lindau tumor suppressor
- WRN:
-
Werner Syndrome protein
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Staroń, K., Girstun, A. (2013). Nucleolar Protein Anchoring and Translocation. In: O'Day, D., Catalano, A. (eds) Proteins of the Nucleolus. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5818-6_10
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