1
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Kharde S, Calviño FR, Gumiero A, Wild K, Sinning I. The structure of Rpf2-Rrs1 explains its role in ribosome biogenesis. Nucleic Acids Res 2015; 43:7083-95. [PMID: 26117542 PMCID: PMC4538828 DOI: 10.1093/nar/gkv640] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 06/07/2015] [Indexed: 12/02/2022] Open
Abstract
The assembly of eukaryotic ribosomes is a hierarchical process involving about 200 biogenesis factors and a series of remodeling steps. The 5S RNP consisting of the 5S rRNA, RpL5 and RpL11 is recruited at an early stage, but has to rearrange during maturation of the pre-60S ribosomal subunit. Rpf2 and Rrs1 have been implicated in 5S RNP biogenesis, but their precise role was unclear. Here, we present the crystal structure of the Rpf2–Rrs1 complex from Aspergillus nidulans at 1.5 Å resolution and describe it as Brix domain of Rpf2 completed by Rrs1 to form two anticodon-binding domains with functionally important tails. Fitting the X-ray structure into the cryo-EM density of a previously described pre-60S particle correlates with biochemical data. The heterodimer forms specific contacts with the 5S rRNA, RpL5 and the biogenesis factor Rsa4. The flexible protein tails of Rpf2–Rrs1 localize to the central protuberance. Two helices in the Rrs1 C-terminal tail occupy a strategic position to block the rotation of 25S rRNA and the 5S RNP. Our data provide a structural model for 5S RNP recruitment to the pre-60S particle and explain why removal of Rpf2–Rrs1 is necessary for rearrangements to drive 60S maturation.
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Affiliation(s)
- Satyavati Kharde
- Heidelberg University Biochemistry Center (BZH), INF 328, D-69120 Heidelberg, Germany
| | - Fabiola R Calviño
- Heidelberg University Biochemistry Center (BZH), INF 328, D-69120 Heidelberg, Germany
| | - Andrea Gumiero
- Heidelberg University Biochemistry Center (BZH), INF 328, D-69120 Heidelberg, Germany
| | - Klemens Wild
- Heidelberg University Biochemistry Center (BZH), INF 328, D-69120 Heidelberg, Germany
| | - Irmgard Sinning
- Heidelberg University Biochemistry Center (BZH), INF 328, D-69120 Heidelberg, Germany
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2
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Lye CM, Naylor HW, Sanson B. Subcellular localisations of the CPTI collection of YFP-tagged proteins in Drosophila embryos. Development 2014; 141:4006-17. [PMID: 25294944 PMCID: PMC4197698 DOI: 10.1242/dev.111310] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A key challenge in the post-genomic area is to identify the function of the genes discovered, with many still uncharacterised in all metazoans. A first step is transcription pattern characterisation, for which we now have near whole-genome coverage in Drosophila. However, we have much more limited information about the expression and subcellular localisation of the corresponding proteins. The Cambridge Protein Trap Consortium generated, via piggyBac transposition, over 600 novel YFP-trap proteins tagging just under 400 Drosophila loci. Here, we characterise the subcellular localisations and expression patterns of these insertions, called the CPTI lines, in Drosophila embryos. We have systematically analysed subcellular localisations at cellularisation (stage 5) and recorded expression patterns at stage 5, at mid-embryogenesis (stage 11) and at late embryogenesis (stages 15-17). At stage 5, 31% of the nuclear lines (41) and 26% of the cytoplasmic lines (67) show discrete localisations that provide clues on the function of the protein and markers for organelles or regions, including nucleoli, the nuclear envelope, nuclear speckles, centrosomes, mitochondria, the endoplasmic reticulum, Golgi, lysosomes and peroxisomes. We characterised the membranous/cortical lines (102) throughout stage 5 to 10 during epithelial morphogenesis, documenting their apico-basal position and identifying those secreted in the extracellular space. We identified the tricellular vertices as a specialized membrane domain marked by the integral membrane protein Sidekick. Finally, we categorised the localisation of the membranous/cortical proteins during cytokinesis.
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Affiliation(s)
- Claire M Lye
- The Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Huw W Naylor
- The Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Bénédicte Sanson
- The Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
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3
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Feng JM, Tian HF, Wen JF. Origin and evolution of the eukaryotic SSU processome revealed by a comprehensive genomic analysis and implications for the origin of the nucleolus. Genome Biol Evol 2014; 5:2255-67. [PMID: 24214024 PMCID: PMC3879963 DOI: 10.1093/gbe/evt173] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
As a nucleolar complex for small-subunit (SSU) ribosomal RNA processing, SSU processome
has been extensively studied mainly in Saccharomyces cerevisiae but not
in diverse organisms, leaving open the question of whether it is a ubiquitous mechanism
across eukaryotes and how it evolved in the course of the evolution of eukaryotes.
Genome-wide survey and identification of SSU processome components showed that the
majority of all 77 yeast SSU processome proteins possess homologs in almost all of the
main eukaryotic lineages, and 14 of them have homologs in archaea but few in bacteria,
suggesting that the complex is ubiquitous in eukaryotes, and its evolutionary history
began with abundant protein homologs being present in archaea and then a fairly complete
form of the complex emerged in the last eukaryotic common ancestor (LECA). Phylogenetic
analysis indicated that ancient gene duplication and functional divergence of the protein
components of the complex occurred frequently during the evolutionary origin of the LECA
from prokaryotes. We found that such duplications not only increased the complex’s
components but also produced some new functional proteins involved in other nucleolar
functions, such as ribosome biogenesis and even some nonnucleolar (but nuclear) proteins
participating in pre-mRNA splicing, implying the evolutionary emergence of the subnuclear
compartment—the nucleolus—has occurred in the LECA. Therefore, the LECA
harbored not only complicated SSU processomes but also a nucleolus. Our analysis also
revealed that gene duplication, innovation, and loss, caused further divergence of the
complex during the divergence of eukaryotes.
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Affiliation(s)
- Jin-Mei Feng
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
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4
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Mura C, Randolph PS, Patterson J, Cozen AE. Archaeal and eukaryotic homologs of Hfq: A structural and evolutionary perspective on Sm function. RNA Biol 2013; 10:636-51. [PMID: 23579284 PMCID: PMC3710371 DOI: 10.4161/rna.24538] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Hfq and other Sm proteins are central in RNA metabolism, forming an evolutionarily conserved family that plays key roles in RNA processing in organisms ranging from archaea to bacteria to human. Sm-based cellular pathways vary in scope from eukaryotic mRNA splicing to bacterial quorum sensing, with at least one step in each of these pathways being mediated by an RNA-associated molecular assembly built upon Sm proteins. Though the first structures of Sm assemblies were from archaeal systems, the functions of Sm-like archaeal proteins (SmAPs) remain murky. Our ignorance about SmAP biology, particularly vis-à-vis the eukaryotic and bacterial Sm homologs, can be partly reduced by leveraging the homology between these lineages to make phylogenetic inferences about Sm functions in archaea. Nevertheless, whether SmAPs are more eukaryotic (RNP scaffold) or bacterial (RNA chaperone) in character remains unclear. Thus, the archaeal domain of life is a missing link, and an opportunity, in Sm-based RNA biology.
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Affiliation(s)
- Cameron Mura
- Department of Chemistry, University of Virginia, Charlottesville, VA, USA
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5
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Furtado C, Regis-da-Silva CG, Passos-Silva DG, Franco GR, Macedo AM, Pena SDJ, Machado CR. Schistosoma mansoni: The IMP4 gene is involved in DNA repair/tolerance after treatment with alkylating agent methyl methane sulfonate. Exp Parasitol 2007; 116:25-34. [PMID: 17189633 DOI: 10.1016/j.exppara.2006.11.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2006] [Revised: 09/19/2006] [Accepted: 11/07/2006] [Indexed: 01/31/2023]
Abstract
Using a functional complementation strategy, we have isolated a Schistosoma mansoni cDNA that complemented Escherichia coli mutant strains which are defective in the DNA base excision repair pathway. This cDNA partially complemented the MMS-sensitive phenotype of these strains. The sequence of the isolated cDNA was homologous to genes involved in the RNA metabolism pathway, especially ScIMP4 of Saccharomyces cerevisiae. To establish whether the S. mansoni cDNA clone could complement yeast ScIMP4-defective mutants, we constructed a yeast haploid strain that coded for a truncated Imp4p protein. This mutant strain was treated with different DNA damaging agents, but showed only MMS sensitivity. The functional homology between the ScIMP4 gene and the cDNA from S. mansoni was verified by partial complementation of the mutant yeast with the worm's gene. This gene appears to be involved in DNA repair and RNA metabolism in both S. mansoni and S. cerevisiae.
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Affiliation(s)
- Carolina Furtado
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CP 486, 31270-010 Belo Horizonte, Minas Gerais, Brazil
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6
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Ng CL, Waterman D, Koonin EV, Antson AA, Ortiz-Lombardía M. Crystal structure of Mil (Mth680): internal duplication and similarity between the Imp4/Brix domain and the anticodon-binding domain of class IIa aminoacyl-tRNA synthetases. EMBO Rep 2005; 6:140-6. [PMID: 15654320 PMCID: PMC1299238 DOI: 10.1038/sj.embor.7400328] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2004] [Revised: 11/08/2004] [Accepted: 12/03/2004] [Indexed: 11/08/2022] Open
Abstract
Proteins of the Imp4/Brix superfamily are involved in ribosomal RNA processing, an essential function in all cells. We report the first structure of an Imp4/Brix superfamily protein, the Mil (for Methanothermobacter thermautotrophicus Imp4-like) protein (gene product Mth680), from the archaeon M. thermautotrophicus. The amino- and carboxy-terminal halves of Mil show significant structural similarity to one another, suggesting an origin by means of an ancestral duplication. Both halves show the same fold as the anticodon-binding domain of class IIa aminoacyl-tRNA synthetases, with greater conservation seen in the N-terminal half. This structural similarity, together with the charge distribution in Mil, suggests that Imp4/Brix superfamily proteins could bind single-stranded segments of RNA along a concave surface formed by the N-terminal half of their beta-sheet and a central alpha-helix. The crystal structure of Mil is incompatible with the presence, in the Imp4/Brix domain, of a helix-turn-helix motif that was proposed to comprise the RNA-binding moiety of the Imp4/Brix proteins.
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Affiliation(s)
- Chyan Leong Ng
- York Structural Biology Laboratory, Chemistry Department, University of York, York YO10 5YW, UK
| | - David Waterman
- York Structural Biology Laboratory, Chemistry Department, University of York, York YO10 5YW, UK
| | - Eugene V Koonin
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, USA
| | - Alfred A Antson
- York Structural Biology Laboratory, Chemistry Department, University of York, York YO10 5YW, UK
| | - Miguel Ortiz-Lombardía
- York Structural Biology Laboratory, Chemistry Department, University of York, York YO10 5YW, UK
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7
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Staub E, Fiziev P, Rosenthal A, Hinzmann B. Insights into the evolution of the nucleolus by an analysis of its protein domain repertoire. Bioessays 2004; 26:567-81. [PMID: 15112237 DOI: 10.1002/bies.20032] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Recently, the first investigation of nucleoli using mass spectrometry led to the identification of 271 proteins. This represents a rich resource for a comprehensive investigation of nucleolus evolution. We applied a protocol for the identification of known and novel conserved protein domains of the nucleolus, resulting in the identification of 115 known and 91 novel domain profiles. The phyletic distribution of nucleolar protein domains in a collection of complete proteomes of selected organisms from all domains of life confirms the archaebacterial origin of the core machinery for ribosome maturation and assembly, but also reveals substantial eubacterial and eukaryotic contributions to nucleolus evolution. We predict that, in different phases of nucleolus evolution, protein domains with different biochemical functions were recruited to the nucleolus. We suggest a model for the late and continuous evolution of the nucleolus in early eukaryotes and argue against an endosymbiotic origin of the nucleolus and the nucleus. Supplementary material for this article can be found on the BioEssays website at http://www.interscience.wiley.com/jpages/0265-9247/suppmat/index.html.
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Affiliation(s)
- Eike Staub
- metaGen Pharmaceuticals GmbH, Berlin, Germany.
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8
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Granneman S, Gallagher JEG, Vogelzangs J, Horstman W, van Venrooij WJ, Baserga SJ, Pruijn GJM. The human Imp3 and Imp4 proteins form a ternary complex with hMpp10, which only interacts with the U3 snoRNA in 60-80S ribonucleoprotein complexes. Nucleic Acids Res 2003; 31:1877-87. [PMID: 12655004 PMCID: PMC152815 DOI: 10.1093/nar/gkg300] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Ribosome biogenesis requires a vast number of trans-acting factors many of which are required for the chemical modification and processing of the pre-rRNA component. The U3 snoRNP complex is required for the early cleavage steps in pre-rRNA processing. We have cloned cDNAs encoding the human and mouse homologs of the yeast U3 snoRNP-associated proteins Imp3 and Imp4. Both human proteins localize to nucleoli and interact with the U3 snoRNA. The results of complementation experiments show that, in contrast to mouse Imp4, mouse Imp3 can partially alleviate the growth defect of the corresponding yeast null strain, indicating that the role of Imp3 in pre-rRNA processing is evolutionarily conserved. The results of density gradient centrifugation experiments show that, in contrast to hU3-55K, the human Imp3 and Imp4 proteins predominantly interact with the U3 snoRNA in 60-80S ribonucleoprotein complexes. In addition, we have found that hImp3, hImp4 and hMpp10 can form a stable hetero-trimeric complex in vitro, which is generated by direct interactions of both hImp3 and hImp4 with hMpp10. The analysis of hImp3 and hImp4 mutants indicated that their binding to hMpp10 correlates with their nucleolar accumulation, strongly suggesting that the formation of the ternary complex of hImp3, hImp4 and hMpp10 is required for their association with nucleolar components.
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Affiliation(s)
- Sander Granneman
- Department of Biochemistry, Nijmegen Center for Molecular Life Sciences, University of Nijmegen, Nijmegen, The Netherlands
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9
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Cohen GN, Barbe V, Flament D, Galperin M, Heilig R, Lecompte O, Poch O, Prieur D, Quérellou J, Ripp R, Thierry JC, Van der Oost J, Weissenbach J, Zivanovic Y, Forterre P. An integrated analysis of the genome of the hyperthermophilic archaeon Pyrococcus abyssi. Mol Microbiol 2003; 47:1495-512. [PMID: 12622808 DOI: 10.1046/j.1365-2958.2003.03381.x] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The hyperthermophilic euryarchaeon Pyrococcus abyssi and the related species Pyrococcus furiosus and Pyrococcus horikoshii, whose genomes have been completely sequenced, are presently used as model organisms in different laboratories to study archaeal DNA replication and gene expression and to develop genetic tools for hyperthermophiles. We have performed an extensive re-annotation of the genome of P. abyssi to obtain an integrated view of its phylogeny, molecular biology and physiology. Many new functions are predicted for both informational and operational proteins. Moreover, several candidate genes have been identified that might encode missing links in key metabolic pathways, some of which have unique biochemical features. The great majority of Pyrococcus proteins are typical archaeal proteins and their phylogenetic pattern agrees with its position near the root of the archaeal tree. However, proteins probably from bacterial origin, including some from mesophilic bacteria, are also present in the P. abyssi genome.
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Affiliation(s)
- Georges N Cohen
- Institut Pasteur, 25,28 rue du Docteur Roux, 75724 Paris CEDEX 15, France
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10
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Thore S, Mayer C, Sauter C, Weeks S, Suck D. Crystal structures of the Pyrococcus abyssi Sm core and its complex with RNA. Common features of RNA binding in archaea and eukarya. J Biol Chem 2003; 278:1239-47. [PMID: 12409299 DOI: 10.1074/jbc.m207685200] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Sm proteins are conserved in all three domains of life and are always associated with U-rich RNA sequences. Their proposed function is to mediate RNA-RNA interactions. We present here the crystal structures of Pyrococcus abyssi Sm protein (PA-Sm1) and its complex with a uridine heptamer. The overall structure of the protein complex, a heptameric ring with a central cavity, is similar to that proposed for the eukaryotic Sm core complex and found for other archaeal Sm proteins. RNA molecules bind to the protein at two different sites. They interact specifically inside the ring with three highly conserved residues, defining the uridine-binding pocket. In addition, nucleotides also interact on the surface formed by the N-terminal alpha-helix as well as a conserved aromatic residue in beta-strand 2 of the PA-Sm1 protein. The mutation of this conserved aromatic residue shows the importance of this second site for the discrimination between RNA sequences. Given the high structural homology between archaeal and eukaryotic Sm proteins, the PA-Sm1.RNA complex provides a model for how the small nuclear RNA contacts the Sm proteins in the Sm core. In addition, it suggests how Sm proteins might exert their function as modulators of RNA-RNA interactions.
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Affiliation(s)
- Stéphane Thore
- Structural Biology Program, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
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11
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Fatica A, Cronshaw AD, Dlakić M, Tollervey D. Ssf1p prevents premature processing of an early pre-60S ribosomal particle. Mol Cell 2002; 9:341-51. [PMID: 11864607 DOI: 10.1016/s1097-2765(02)00458-6] [Citation(s) in RCA: 147] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Ssf1p and Ssf2p are two nearly identical and functionally redundant nucleolar proteins. In the absence of Ssf1p and Ssf2p, the 27SA(2) pre-rRNA was prematurely cleaved, inhibiting synthesis of the 27SB and 7S pre-rRNAs and the 5.8S and 25S rRNA components of the large ribosomal subunit. On sucrose gradients, Ssf1p sedimented with pre-60S ribosomal particles. The 27SA(2), 27SA(3), and 27SB pre-rRNAs were copurified with tagged Ssf1p, as were 23 large subunit ribosomal proteins and 21 other proteins implicated in ribosome biogenesis. These included four Brix family proteins, Ssf1p, Rpf1p, Rpf2p, and Brx1p, indicating that the entire family functions in ribosome synthesis. This complex is distinct from recently reported pre-60S complexes in RNA and protein composition. We describe a multistep pathway of 60S preribosome maturation.
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12
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Kaser A, Bogengruber E, Hallegger M, Doppler E, Lepperdinger G, Jantsch M, Breitenbach M, Kreil G. Brix from xenopus laevis and brx1p from yeast define a new family of proteins involved in the biogenesis of large ribosomal subunits. Biol Chem 2001; 382:1637-47. [PMID: 11843177 DOI: 10.1515/bc.2001.199] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A clone was isolated from a cDNA library from early embryos of Xenopus laevis that codes for a highly charged protein containing 339 amino acids. Two putative nuclear localization signals could be identified in its sequence, but no other known motifs or domains. Closely related ORFs are present in the genomes of man, C. elegans, yeast and Arabidopsis. A fusion protein with GFP expressed in HeLa cells or Xenopus oocytes was found to be localized in the nucleolus and coiled (Cajal) bodies. Moreover, immunoprecipitation experiments demonstrated that the new Xenopus protein interacts with 5S, 5.8S and 28S RNAs of large ribosomal subunits. The name Brix (biogenesis of ribosomes in Xenopus) is proposed for this protein and the corresponding gene. In Saccharomyces cerevisiae, the essential gene YOL077c, now named BRX1, codes for the Brix homolog, which is also localized in the nucleolus. Depletion of Brx1 p in a conditional yeast mutant leads to defects in rRNA processing, and a block in the assembly of large ribosomal subunits.
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MESH Headings
- Amino Acid Sequence
- Animals
- Base Sequence
- Blotting, Northern
- Cell Nucleolus/ultrastructure
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/genetics
- Fluorescent Antibody Technique
- HeLa Cells
- Humans
- Molecular Sequence Data
- Precipitin Tests
- RNA, Ribosomal, 28S/chemistry
- RNA, Ribosomal, 28S/genetics
- RNA, Ribosomal, 5.8S/chemistry
- RNA, Ribosomal, 5.8S/genetics
- RNA, Ribosomal, 5S/chemistry
- RNA, Ribosomal, 5S/genetics
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism
- Ribosomal Proteins/biosynthesis
- Ribosomal Proteins/genetics
- Saccharomyces cerevisiae/genetics
- Saccharomyces cerevisiae Proteins/genetics
- Saccharomyces cerevisiae Proteins/metabolism
- Sequence Homology, Amino Acid
- Xenopus laevis/genetics
- Xenopus laevis/metabolism
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Affiliation(s)
- A Kaser
- Institute of Molecular Biology, Austrian Academy of Sciences, Salzburg
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13
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Eisenhaber F, Wechselberger C, Kreil G. The Brix domain protein family -- a key to the ribosomal biogenesis pathway? Trends Biochem Sci 2001; 26:345-7. [PMID: 11406393 DOI: 10.1016/s0968-0004(01)01851-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Six (one archaean and five eukaryotic) protein families have similar domain architecture that includes a central globular Brix domain, and optional N- and obligatory C-terminal segments, both with charged low-complexity regions. Biological data for some proteins in this superfamily suggest a role in ribosome biogenesis and rRNA binding.
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Affiliation(s)
- F Eisenhaber
- Research Institute of Molecular Pathology, Dr.Bohr-Gasse 7, A-1030 Vienna, Rep. Austria.
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