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1.
Nucleic Acids Res ; 48(21): 12310-12325, 2020 12 02.
Artigo em Inglês | MEDLINE | ID: mdl-33166396

RESUMO

The Mtq2-Trm112 methyltransferase modifies the eukaryotic translation termination factor eRF1 on the glutamine side chain of a universally conserved GGQ motif that is essential for release of newly synthesized peptides. Although this modification is found in the three domains of life, its exact role in eukaryotes remains unknown. As the deletion of MTQ2 leads to severe growth impairment in yeast, we have investigated its role further and tested its putative involvement in ribosome biogenesis. We found that Mtq2 is associated with nuclear 60S subunit precursors, and we demonstrate that its catalytic activity is required for nucleolar release of pre-60S and for efficient production of mature 5.8S and 25S rRNAs. Thus, we identify Mtq2 as a novel ribosome assembly factor important for large ribosomal subunit formation. We propose that Mtq2-Trm112 might modify eRF1 in the nucleus as part of a quality control mechanism aimed at proof-reading the peptidyl transferase center, where it will subsequently bind during translation termination.


Assuntos
Regulação Fúngica da Expressão Gênica , Metiltransferases/genética , Biogênese de Organelas , Fatores de Terminação de Peptídeos/genética , Subunidades Ribossômicas Maiores de Eucariotos/genética , Proteínas de Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/genética , tRNA Metiltransferases/genética , Sítios de Ligação , Biocatálise , Clonagem Molecular , Cristalografia por Raios X , Escherichia coli/genética , Escherichia coli/metabolismo , Vetores Genéticos/química , Vetores Genéticos/metabolismo , Metiltransferases/química , Metiltransferases/metabolismo , Modelos Moleculares , Terminação Traducional da Cadeia Peptídica , Fatores de Terminação de Peptídeos/metabolismo , Ligação Proteica , Conformação Proteica em alfa-Hélice , Conformação Proteica em Folha beta , Domínios e Motivos de Interação entre Proteínas , RNA Ribossômico/biossíntese , RNA Ribossômico/genética , RNA Ribossômico 5,8S/biossíntese , RNA Ribossômico 5,8S/genética , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Subunidades Ribossômicas Maiores de Eucariotos/metabolismo , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/química , Proteínas de Saccharomyces cerevisiae/metabolismo , Especificidade por Substrato , tRNA Metiltransferases/química , tRNA Metiltransferases/metabolismo
2.
Mol Cell ; 74(6): 1227-1238.e3, 2019 06 20.
Artigo em Inglês | MEDLINE | ID: mdl-31003868

RESUMO

rRNAs and tRNAs universally require processing from longer primary transcripts to become functional for translation. Here, we describe an unsuspected link between tRNA maturation and the 3' processing of 16S rRNA, a key step in preparing the small ribosomal subunit for interaction with the Shine-Dalgarno sequence in prokaryotic translation initiation. We show that an accumulation of either 5' or 3' immature tRNAs triggers RelA-dependent production of the stringent response alarmone (p)ppGpp in the Gram-positive model organism Bacillus subtilis. The accumulation of (p)ppGpp and accompanying decrease in GTP levels specifically inhibit 16S rRNA 3' maturation. We suggest that cells can exploit this mechanism to sense potential slowdowns in tRNA maturation and adjust rRNA processing accordingly to maintain the appropriate functional balance between these two major components of the translation apparatus.


Assuntos
Bacillus subtilis/genética , Regulação Bacteriana da Expressão Gênica , Guanosina Pentafosfato/biossíntese , Iniciação Traducional da Cadeia Peptídica , RNA Ribossômico 16S/genética , RNA de Transferência/genética , Bacillus subtilis/metabolismo , Sequência de Bases , Guanosina Pentafosfato/genética , Guanosina Trifosfato/metabolismo , Ligases/genética , Ligases/metabolismo , Conformação de Ácido Nucleico , RNA Ribossômico 16S/química , RNA Ribossômico 16S/metabolismo , RNA de Transferência/química , RNA de Transferência/metabolismo , Subunidades Ribossômicas Maiores de Bactérias/genética , Subunidades Ribossômicas Maiores de Bactérias/metabolismo , Subunidades Ribossômicas Menores de Bactérias/genética , Subunidades Ribossômicas Menores de Bactérias/metabolismo
3.
Nucleic Acids Res ; 46(16): 8605-8615, 2018 09 19.
Artigo em Inglês | MEDLINE | ID: mdl-29873764

RESUMO

Ribosomal RNAs are processed from primary transcripts containing 16S, 23S and 5S rRNAs in most bacteria. Maturation generally occurs in a two-step process, consisting of a first crude separation of the major species by RNase III during transcription, followed by precise trimming of 5' and 3' extensions on each species upon accurate completion of subunit assembly. The various endo- and exoribonucleases involved in the final processing reactions are strikingly different in Escherichia coli and Bacillus subtilis, the two best studied representatives of Gram-negative and Gram-positive bacteria, respectively. Here, we show that the one exception to this rule is the protein involved in the maturation of the 3' end of 16S rRNA. Cells depleted for the essential B. subtilis YqfG protein, a homologue of E. coli YbeY, specifically accumulate 16S rRNA precursors bearing 3' extensions. Remarkably, the essential nature of YqfG can be suppressed by deleting the ribosomal RNA degrading enzyme RNase R, i.e. a ΔyqfG Δrnr mutant is viable. Our data suggest that 70S ribosomes containing 30S subunits with 3' extensions of 16S rRNA are functional to a degree, but become substrates for degradation by RNase R and are eliminated.


Assuntos
Bacillus subtilis/genética , Proteínas de Bactérias/genética , Exorribonucleases/genética , Deleção de Genes , Processamento de Terminações 3' de RNA , RNA Ribossômico 16S/genética , Sequência de Aminoácidos , Bacillus subtilis/metabolismo , Proteínas de Bactérias/metabolismo , Sequência de Bases , Escherichia coli/genética , Escherichia coli/metabolismo , Proteínas de Escherichia coli/genética , Proteínas de Escherichia coli/metabolismo , Exorribonucleases/metabolismo , Metaloproteínas/genética , Metaloproteínas/metabolismo , Precursores de RNA/genética , Precursores de RNA/metabolismo , RNA Bacteriano/genética , RNA Bacteriano/metabolismo , RNA Ribossômico 16S/metabolismo , Homologia de Sequência de Aminoácidos , Especificidade da Espécie
4.
EMBO J ; 36(9): 1167-1181, 2017 05 02.
Artigo em Inglês | MEDLINE | ID: mdl-28363943

RESUMO

The PIN domain plays a central role in cellular RNA biology and is involved in processes as diverse as rRNA maturation, mRNA decay and telomerase function. Here, we solve the crystal structure of the Rae1 (YacP) protein of Bacillus subtilis, a founding member of the NYN (Nedd4-BP1/YacP nuclease) subfamily of PIN domain proteins, and identify potential substrates in vivo Unexpectedly, degradation of a characterised target mRNA was completely dependent on both its translation and reading frame. We provide evidence that Rae1 associates with the B. subtilis ribosome and cleaves between specific codons of this mRNA in vivo Critically, we also demonstrate translation-dependent Rae1 cleavage of this substrate in a purified translation assay in vitro Multiple lines of evidence converge to suggest that Rae1 is an A-site endoribonuclease. We present a docking model of Rae1 bound to the B. subtilis ribosomal A-site that is consistent with this hypothesis and show that Rae1 cleaves optimally immediately upstream of a lysine codon (AAA or AAG) in vivo.


Assuntos
Bacillus subtilis/enzimologia , Bacillus subtilis/metabolismo , Endorribonucleases/química , Endorribonucleases/metabolismo , Biossíntese de Proteínas , Estabilidade de RNA , Ribossomos/metabolismo , Cristalografia por Raios X , Modelos Biológicos , Modelos Moleculares , Conformação Proteica
5.
Nucleic Acids Res ; 44(7): 3373-89, 2016 Apr 20.
Artigo em Inglês | MEDLINE | ID: mdl-26883633

RESUMO

The recent findings that the narrow-specificity endoribonuclease RNase III and the 5' exonuclease RNase J1 are not essential in the Gram-positive model organism,Bacillus subtilis, facilitated a global analysis of internal 5' ends that are generated or acted upon by these enzymes. An RNA-Seq protocol known as PARE (Parallel Analysis of RNA Ends) was used to capture 5' monophosphorylated RNA ends in ribonuclease wild-type and mutant strains. Comparison of PARE peaks in strains with RNase III present or absent showed that, in addition to its well-known role in ribosomal (rRNA) processing, many coding sequences and intergenic regions appeared to be direct targets of RNase III. These target sites were, in most cases, not associated with a known antisense RNA. The PARE analysis also revealed an accumulation of 3'-proximal peaks that correlated with the absence of RNase J1, confirming the importance of RNase J1 in degrading RNA fragments that contain the transcription terminator structure. A significant result from the PARE analysis was the discovery of an endonuclease cleavage just 2 nts downstream of the 16S rRNA 3' end. This latter observation begins to answer, at least for B. subtilis, a long-standing question on the exonucleolytic versus endonucleolytic nature of 16S rRNA maturation.


Assuntos
Bacillus subtilis/genética , Exorribonucleases/metabolismo , RNA Mensageiro/metabolismo , RNA Ribossômico/metabolismo , Ribonuclease III/metabolismo , Sistemas de Transporte de Aminoácidos Neutros/genética , Bacillus subtilis/enzimologia , Bacillus subtilis/metabolismo , Mutação , Óperon , Processamento Pós-Transcricional do RNA , RNA Bacteriano/química , RNA Bacteriano/metabolismo , RNA Mensageiro/química , RNA Ribossômico/química , RNA Ribossômico 16S/metabolismo , RNA Citoplasmático Pequeno/metabolismo , Análise de Sequência de RNA
7.
Mol Microbiol ; 95(2): 270-82, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25402410

RESUMO

Stable RNA maturation is a key process in the generation of functional RNAs, and failure to correctly process these RNAs can lead to their elimination through quality control mechanisms. Studies of the maturation pathways of ribosomal RNA and transfer RNA in Bacillus subtilis showed they were radically different from Escherichia coli and led to the identification of new B. subtilis-specific enzymes. We noticed that, despite their important roles in translation, a number of B. subtilis small stable RNAs still did not have characterised maturation pathways, notably the tmRNA, involved in ribosome rescue, and the RNase P RNA, involved in tRNA maturation. Here, we show that tmRNA is matured by RNase P and RNase Z at its 5' and 3' extremities, respectively, whereas the RNase P RNA is matured on its 3' side by RNase Y. Recent evidence that several RNases are not essential in B. subtilis prompted us to revisit maturation of the scRNA, a component of the signal recognition particle involved in co-translational insertion of specific proteins into the membrane. We show that RNase Y is also involved in 3' processing of scRNA. Lastly, we identified some of the enzymes involved in the turnover of these three stable RNAs.


Assuntos
Bacillus subtilis/genética , RNA Bacteriano/metabolismo , RNA Citoplasmático Pequeno/metabolismo , Ribonuclease P/metabolismo , Sequência de Bases , Endorribonucleases/metabolismo , Exorribonucleases/metabolismo , Genótipo , RNA Bacteriano/genética , RNA Ribossômico/metabolismo , RNA Citoplasmático Pequeno/genética , Ribonucleases/metabolismo
8.
J Bacteriol ; 195(10): 2340-8, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23504012

RESUMO

The genes encoding the ribonucleases RNase J1 and RNase Y have long been considered essential for Bacillus subtilis cell viability, even before there was concrete knowledge of their function as two of the most important enzymes for RNA turnover in this organism. Here we show that this characterization is incorrect and that ΔrnjA and Δrny mutants are both viable. As expected, both strains grow relatively slowly, with doubling times in the hour range in rich medium. Knockout mutants have major defects in their sporulation and competence development programs. Both mutants are hypersensitive to a wide range of antibiotics and have dramatic alterations to their cell morphologies, suggestive of cell envelope defects. Indeed, RNase Y mutants are significantly smaller in diameter than wild-type strains and have a very disordered peptidoglycan layer. Strains lacking RNase J1 form long filaments in tight spirals, reminiscent of mutants of the actin-like proteins (Mre) involved in cell shape determination. Finally, we combined the rnjA and rny mutations with mutations in other components of the degradation machinery and show that many of these strains are also viable. The implications for the two known RNA degradation pathways of B. subtilis are discussed.


Assuntos
Bacillus subtilis/enzimologia , Proteínas de Bactérias/metabolismo , Ribonucleases/metabolismo , Bacillus subtilis/fisiologia , Bacillus subtilis/ultraestrutura , Proteínas de Bactérias/genética , Regulação Bacteriana da Expressão Gênica , Microscopia Eletrônica de Transmissão , Mutação , Ribonucleases/genética
9.
Mol Cell Biol ; 32(12): 2254-67, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22493060

RESUMO

Posttranscriptional and posttranslational modification of macromolecules is known to fine-tune their functions. Trm112 is unique, acting as an activator of both tRNA and protein methyltransferases. Here we report that in Saccharomyces cerevisiae, Trm112 is required for efficient ribosome synthesis and progression through mitosis. Trm112 copurifies with pre-rRNAs and with multiple ribosome synthesis trans-acting factors, including the 18S rRNA methyltransferase Bud23. Consistent with the known mechanisms of activation of methyltransferases by Trm112, we found that Trm112 interacts directly with Bud23 in vitro and that it is required for its stability in vivo. Consequently, trm112Δ cells are deficient for Bud23-mediated 18S rRNA methylation at position G1575 and for small ribosome subunit formation. Bud23 failure to bind nascent preribosomes activates a nucleolar surveillance pathway involving the TRAMP complexes, leading to preribosome degradation. Trm112 is thus active in rRNA, tRNA, and translation factor modification, ideally placing it at the interface between ribosome synthesis and function.


Assuntos
Metiltransferases/metabolismo , RNA Ribossômico 18S/metabolismo , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomyces cerevisiae , tRNA Metiltransferases/metabolismo , Guanina , Metilação , Proteínas Metiltransferases/metabolismo , Processamento Pós-Transcricional do RNA , RNA de Transferência/metabolismo , Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/metabolismo
10.
Biochimie ; 94(7): 1533-43, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22266024

RESUMO

During protein synthesis, release of polypeptide from the ribosome occurs when an in frame termination codon is encountered. Contrary to sense codons, which are decoded by tRNAs, stop codons present in the A-site are recognized by proteins named class I release factors, leading to the release of newly synthesized proteins. Structures of these factors bound to termination ribosomal complexes have recently been obtained, and lead to a better understanding of stop codon recognition and its coordination with peptidyl-tRNA hydrolysis in bacteria. Release factors contain a universally conserved GGQ motif which interacts with the peptidyl-transferase centre to allow peptide release. The Gln side chain from this motif is methylated, a feature conserved from bacteria to man, suggesting an important biological role. However, methylation is catalysed by completely unrelated enzymes. The function of this motif and its post-translational modification will be discussed in the context of recent structural and functional studies.


Assuntos
Terminação Traducional da Cadeia Peptídica , Fatores de Terminação de Peptídeos/química , Fatores de Terminação de Peptídeos/metabolismo , Animais , Humanos , Metilação , tRNA Metiltransferases/metabolismo
11.
Nucleic Acids Res ; 39(14): 6249-59, 2011 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-21478168

RESUMO

Methylation is a common modification encountered in DNA, RNA and proteins. It plays a central role in gene expression, protein function and mRNA translation. Prokaryotic and eukaryotic class I translation termination factors are methylated on the glutamine of the essential and universally conserved GGQ motif, in line with an important cellular role. In eukaryotes, this modification is performed by the Mtq2-Trm112 holoenzyme. Trm112 activates not only the Mtq2 catalytic subunit but also two other tRNA methyltransferases (Trm9 and Trm11). To understand the molecular mechanisms underlying methyltransferase activation by Trm112, we have determined the 3D structure of the Mtq2-Trm112 complex and mapped its active site. Using site-directed mutagenesis and in vivo functional experiments, we show that this structure can also serve as a model for the Trm9-Trm112 complex, supporting our hypothesis that Trm112 uses a common strategy to activate these three methyltransferases.


Assuntos
Proteínas Metiltransferases/química , Subunidades Proteicas/química , Domínio Catalítico , Cristalografia , Ativação Enzimática , Proteínas Fúngicas/química , Deleção de Genes , Modelos Moleculares , Mutagênese Sítio-Dirigida , Ligação Proteica , Biossíntese de Proteínas , Proteínas Metiltransferases/genética , Subunidades Proteicas/genética , S-Adenosilmetionina/química , Proteínas de Saccharomyces cerevisiae/genética , tRNA Metiltransferases/genética
12.
FEBS Lett ; 582(16): 2352-6, 2008 Jul 09.
Artigo em Inglês | MEDLINE | ID: mdl-18539146

RESUMO

The ubiquitous tripeptide Gly-Gly-Gln in class 1 polypeptide release factors triggers polypeptide release on ribosomes. The Gln residue in both bacterial and yeast release factors is N5-methylated, despite their distinct evolutionary origin. Methylation of eRF1 in yeast is performed by the heterodimeric methyltransferase (MTase) Mtq2p/Trm112p, and requires eRF3 and GTP. Homologues of yeast Mtq2p and Trm112p are found in man, annotated as an N6-DNA-methyltransferase and of unknown function. Here we show that the human proteins methylate human and yeast eRF1.eRF3.GTP in vitro, and that the MTase catalytic subunit can complement the growth defect of yeast strains deleted for mtq2.


Assuntos
Metiltransferases/metabolismo , Fatores de Terminação de Peptídeos/metabolismo , Proteínas Metiltransferases/metabolismo , Sequência de Aminoácidos , Animais , Cromossomos Humanos Par 21 , Teste de Complementação Genética , Humanos , Metiltransferases/química , Metiltransferases/genética , Camundongos , Dados de Sequência Molecular , Proteínas Metiltransferases/química , Proteínas Metiltransferases/genética , Proteínas de Saccharomyces cerevisiae/metabolismo , Homologia de Sequência de Aminoácidos
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