Nucleolar binding sequences of the ribosomal protein S6e family reside in evolutionary highly conserved peptide clusters.

Abstract:

:Proteomic analyses of the nucleolus have revealed almost 700 functionally diverse proteins implicated in ribosome biogenesis, nucleolar assembly, and regulation of vital cellular processes. However, this nucleolar inventory has not unveiled a specific consensus motif necessary for nucleolar binding. The ribosomal protein family characterized by their basic nature should exhibit distinct binding sequences that enable interactions with the rRNA precursor molecules facilitating subunit assembly. We succeeded in delineating 2 minimal nucleolar binding sequences of human ribosomal protein S6 by fusing S6 cDNA fragments to the 5' end of the LacZ gene and subsequently detecting the intracellular localization of the beta-galactosidase fusion proteins. Nobis1 (nucleolar binding sequence 1), comprising of 4 highly conserved amino acid clusters separated by glycine or proline, functions independently of the 3 authentic nuclear localization signals (NLSs). Nobis2 consists of 2 conserved peptide clusters and requires the authentic NLS2 in its native context. Similarly, we deduced from previous publications that the single Nobis of ribosomal protein S25 is also highly conserved. The functional protein domain organization of the ribosomal protein S6e family consists of 3 modules: NLS, Nobis, and the C-terminal serine cluster of the phosphorylation sites. This modular structure is evolutionary conserved in vertebrates, invertebrates, and fungi. Remarkably, nucleolar binding sequences of small and large ribosomal proteins reside in peptide clusters conserved over millions of years.

journal_name

Mol Biol Evol

authors

Kundu-Michalik S,Bisotti MA,Lipsius E,Bauche A,Kruppa A,Klokow T,Kammler G,Kruppa J

doi

10.1093/molbev/msn002

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

580-90

issue

3

eissn

0737-4038

issn

1537-1719

pii

msn002

journal_volume

25

pub_type

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