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https://www.readbyqxmd.com/read/26438534/insights-into-molecular-plasticity-in-protein-complexes-from-trm9-trm112-trna-modifying-enzyme-crystal-structure
#1
Juliette Létoquart, Nhan van Tran, Vonny Caroline, Alexey Aleksandrov, Noureddine Lazar, Herman van Tilbeurgh, Dominique Liger, Marc Graille
Most of the factors involved in translation (tRNA, rRNA and proteins) are subject to post-transcriptional and post-translational modifications, which participate in the fine-tuning and tight control of ribosome and protein synthesis processes. In eukaryotes, Trm112 acts as an obligate activating platform for at least four methyltransferases (MTase) involved in the modification of 18S rRNA (Bud23), tRNA (Trm9 and Trm11) and translation termination factor eRF1 (Mtq2). Trm112 is then at a nexus between ribosome synthesis and function...
December 15, 2015: Nucleic Acids Research
https://www.readbyqxmd.com/read/21478168/mechanism-of-activation-of-methyltransferases-involved-in-translation-by-the-trm112-hub-protein
#2
Dominique Liger, Liliana Mora, Noureddine Lazar, Sabine Figaro, Julien Henri, Nathalie Scrima, Richard H Buckingham, Herman van Tilbeurgh, Valérie Heurgué-Hamard, Marc Graille
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)...
August 2011: Nucleic Acids Research
https://www.readbyqxmd.com/read/21193388/involvement-of-n-6-adenine-specific-dna-methyltransferase-1-n6amt1-in-arsenic-biomethylation-and-its-role-in-arsenic-induced-toxicity
#3
Xuefeng Ren, Maria Aleshin, William J Jo, Russel Dills, David A Kalman, Christopher D Vulpe, Martyn T Smith, Luoping Zhang
BACKGROUND: In humans, inorganic arsenic (iAs) is metabolized to methylated arsenical species in a multistep process mainly mediated by arsenic (+3 oxidation state) methyltransferase (AS3MT). Among these metabolites is monomethylarsonous acid (MMAIII), the most toxic arsenic species. A recent study in As3mt-knockout mice suggests that unidentified methyltransferases could be involved in alternative iAs methylation pathways. We found that yeast deletion mutants lacking MTQ2 were highly resistant to iAs exposure...
June 2011: Environmental Health Perspectives
https://www.readbyqxmd.com/read/20400505/trm112p-is-a-15-kda-zinc-finger-protein-essential-for-the-activity-of-two-trna-and-one-protein-methyltransferases-in-yeast
#4
Marie-Hélène Mazauric, Léon Dirick, Suresh K Purushothaman, Glenn R Björk, Bruno Lapeyre
The degenerate base at position 34 of the tRNA anticodon is the target of numerous modification enzymes. In Saccharomyces cerevisiae, five tRNAs exhibit a complex modification of uridine 34 (mcm(5)U(34) and mcm(5)s(2)U(34)), the formation of which requires at least 25 different proteins. The addition of the last methyl group is catalyzed by the methyltransferase Trm9p. Trm9p interacts with Trm112p, a 15-kDa protein with a zinc finger domain. Trm112p is essential for the activity of Trm11p, another tRNA methyltransferase, and for Mtq2p, an enzyme that methylates the translation termination factor eRF1/Sup45...
June 11, 2010: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/19749381/production-of-yeast-m2g10-methyltransferase-trm11-and-trm112-complex-in-a-wheat-germ-cell-free-translation-system
#5
Kazuki Okada, Yuki Muneyoshi, Yaeta Endo, Hiroyuki Hori
Transfer RNA (guanine-N(2)-)-methyltransferase [tRNA (m(2)G10) methyltransferase] catalyzes a methyl-transfer from S-adenosyl-L-methionine to N(2)-atom of guanine at position 10 (G10) in tRNA and generates N(2)-methylguanine at position 10 (m(2)G10). Yeast enzyme contains two protein subunits (Trm11 and Trm112). Trm11 protein is expected to be a catalytic subunit and Trm112 contains a Zinc-finger. In yeast cells, Trm112 binds not only to Trm11 but also to other proteins such as Lys9, Trm9, and Mtq2. Therefore, the Trm112 protein may regulate population of several protein complexes...
2009: Nucleic Acids Symposium Series
https://www.readbyqxmd.com/read/18657261/trna-and-protein-methylase-complexes-mediate-zymocin-toxicity-in-yeast
#6
Patrick Studte, Sabrina Zink, Daniel Jablonowski, Christian Bär, Tobias von der Haar, Mick F Tuite, Raffael Schaffrath
Modification of Saccharomyces cerevisiae tRNA anticodons at the wobble uridine (U34) position is required for tRNA cleavage by the zymocin tRNase killer toxin from Kluyveromyces lactis. Hence, U34 modification defects including lack of the U34 tRNA methyltransferase Trm9 protect against tRNA cleavage and zymocin. Using zymocin as a tool, we have identified toxin-resistant mutations in TRM9 that are likely to affect the U34 methylation reaction. Most strikingly, C-terminal truncations in Trm9 abolish interaction with Trm112, a protein shown to individually purify with Lys9 and two more methylases, Trm11 and Mtq2...
September 2008: Molecular Microbiology
https://www.readbyqxmd.com/read/18539146/hemk2-protein-encoded-on-human-chromosome-21-methylates-translation-termination-factor-erf1
#7
Sabine Figaro, Nathalie Scrima, Richard H Buckingham, Valérie Heurgué-Hamard
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...
July 9, 2008: FEBS Letters
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