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Human pseudouridine synthase 3 (PUS3 R116A mutant) and tRNA-Gln

ABSTRACT:

SUBMITTER: Lukasz Koziej

PROVIDER: EMPIAR-12003 | biostudies-other |

REPOSITORIES: biostudies-other

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The molecular basis of tRNA selectivity by human pseudouridine synthase 3.

Lin Ting-Yu TY Kleemann Leon L Jeżowski Jakub J Dobosz Dominika D Rawski Michał M Indyka Paulina P Ważny Grzegorz G Mehta Rahul R Chramiec-Głąbik Andrzej A Koziej Łukasz Ł Ranff Tristan T Fufezan Christian C Wawro Mateusz M Kochan Jakub J Bereta Joanna J Leidel Sebastian A SA Glatt Sebastian S

Molecular cell 20240701 13

Pseudouridine (Ψ), the isomer of uridine, is ubiquitously found in RNA, including tRNA, rRNA, and mRNA. Human pseudouridine synthase 3 (PUS3) catalyzes pseudouridylation of position 38/39 in tRNAs. However, the molecular mechanisms by which it recognizes its RNA targets and achieves site specificity remain elusive. Here, we determine single-particle cryo-EM structures of PUS3 in its apo form and bound to three tRNAs, showing how the symmetric PUS3 homodimer recognizes tRNAs and positions the tar ...[more]

PMID: 38996458

Similar Datasets

Cryo-EM structure of human pseudouridine synthase 3 and tRNA-Gln

Project description: Not available

| EMPIAR-11511 | biostudies-other

Human pseudouridine synthase 3 (PUS3 D118A mutant) and tRNA-Arg

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| EMPIAR-12004 | biostudies-other

Human pseudouridine synthase 3 (PUS3 D118A mutant) and pre-tRNA-Arg

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| EMPIAR-12005 | biostudies-other

The molecular basis of tRNA selectivity by human pseudouridine synthase 3.

Project description:Pseudouridine (Ψ), the isomer of uridine, is ubiquitously found in RNA, including tRNA, rRNA, and mRNA. Human pseudouridine synthase 3 (PUS3) catalyzes pseudouridylation of position 38/39 in tRNAs. However, the molecular mechanisms by which it recognizes its RNA targets and achieves site specificity remain elusive. Here, we determine single-particle cryo-EM structures of PUS3 in its apo form and bound to three tRNAs, showing how the symmetric PUS3 homodimer recognizes tRNAs and positions the target uridine next to its active site. Structure-guided and patient-derived mutations validate our structural findings in complementary biochemical assays. Furthermore, we deleted PUS1 and PUS3 in HEK293 cells and mapped transcriptome-wide Ψ sites by Pseudo-seq. Although PUS1-dependent sites were detectable in tRNA and mRNA, we found no evidence that human PUS3 modifies mRNAs. Our work provides the molecular basis for PUS3-mediated tRNA modification in humans and explains how its tRNA modification activity is linked to intellectual disabilities.

| S-EPMC11258540 | biostudies-literature

tRNA elbow modifications affect the tRNA pseudouridine synthase TruB and the methyltransferase TrmA.

Project description:tRNAs constitute the most highly modified class of RNA. Every tRNA contains a unique set of modifications, and Ψ55, m5U54, and m7G46 are frequently found within the elbow of the tRNA structure. Despite the abundance of tRNA modifications, we are only beginning to understand the orchestration of modification enzymes during tRNA maturation. Here, we investigated whether pre-existing modifications impact the binding affinity or catalysis by tRNA elbow modification enzymes. Specifically, we focused on the Escherichia coli enzymes TruB, TrmA, and TrmB which generate Ψ55, m5U54, and m7G46, respectively. tRNAs containing a single modification were prepared, and the binding and activity preferences of purified E. coli TrmA, TruB, and TrmB were examined in vitro. TruB preferentially binds and modifies unmodified tRNA. TrmA prefers to modify unmodified tRNA, but binds most tightly to tRNA that already contains Ψ55. In contrast, binding and modification by TrmB is insensitive to the tRNA modification status. Our results suggest that TrmA and TruB are likely to act on mostly unmodified tRNA precursors during the early stages of tRNA maturation whereas TrmB presumably acts on later tRNA intermediates that are already partially modified. In conclusion, we uncover the mechanistic basis for the preferred modification order in the E. coli tRNA elbow region.

| S-EPMC7430675 | biostudies-literature

Cloning and characterization of the Schizosaccharomyces pombe tRNA:pseudouridine synthase Pus1p.

Project description:Saccharomyces cerevisiae cells that carry deletions in both the LOS1 (a tRNA export receptor) and the PUS1 (a tRNA:pseudouridine synthase) genes exhibit a thermosensitive growth defect. A Schizosaccharomyces pombe gene, named spPUS1, was cloned from a cDNA library by complementation of this conditional lethal phenotype. The corresponding protein, spPus1p, shows sequence similarity to S. cerevisiae and murine Pus1p as well as other known members of the pseudouridine synthase family. Accordingly, recombinant spPus1p can catalyze in vitro the formation of pseudouridines at positions 27, 28, 34, 35 and 36 of yeast tRNA transcripts. The sequence and functional conservation of the Pus1p proteins in fungi and mammalian species and their notable absence from prokaryotes suggest that this family of pseudouridine synthases is required for a eukaryote-specific step of tRNA biogenesis, such as nuclear export.

| S-EPMC115158 | biostudies-literature

The tRNA pseudouridine synthase TruB1 regulates the maturation of let-7 miRNA.

Project description:Let-7 is an evolutionary conserved microRNA that mediates post-transcriptional gene silencing to regulate a wide range of biological processes, including development, differentiation, and tumor suppression. Let-7 biogenesis is tightly regulated by several RNA-binding proteins, including Lin28A/B, which represses let-7 maturation. To identify new regulators of let-7, we devised a cell-based functional screen of RNA-binding proteins using a let-7 sensor luciferase reporter and identified the tRNA pseudouridine synthase, TruB1. TruB1 enhanced maturation specifically of let-7 family members. Rather than inducing pseudouridylation of the miRNAs, high-throughput sequencing crosslinking immunoprecipitation (HITS-CLIP) and biochemical analyses revealed direct binding between endogenous TruB1 and the stem-loop structure of pri-let-7, which also binds Lin28A/B. TruB1 selectively enhanced the interaction between pri-let-7 and the microprocessor DGCR8, which mediates miRNA maturation. Finally, TruB1 suppressed cell proliferation, which was mediated in part by let-7. Altogether, we reveal an unexpected function for TruB1 in promoting let-7 maturation.

| S-EPMC7560213 | biostudies-literature

The molecular basis of tRNA selectivity by human pseudouridine synthase 3 (PUS3)

Project description:Pseudouridine (Ψ), the isomer of uridine, is ubiquitous in most RNA families, including tRNA, rRNA and mRNA. Pseudouridine synthase 3 (PUS3) catalyzes pseudouridylation of position 38/39 in tRNAs, but whether it can modify other RNA types, including mRNA, remains elusive. Here, we determine the single particle cryo-EM structure of apo and tRNA-bound human PUS3, showing how it forms a symmetric homodimer that recognizes the characteristic L-shape of tRNA across two distinct interaction interfaces. Structure-guided and patient-derived mutations validate our structural findings in complementary biochemical assays. Furthermore, we deleted PUS1 and PUS3 in HEK293 cells and used Pseudo-seq to detect Ψ sites in the transcriptome. Although PUS1-dependent sites were detectable in tRNA and mRNA, we did not find any evidence for PUS3 modifying other RNA classes than tRNA. In summary, our work provides the molecular basis for PUS3-mediated tRNA modification in humans and aids in understanding how impairments in its activity lead to intellectual disabilities through defects in tRNA modifications.

2024-07-10 | GSE255287 | GEO

A Structural Motif for mRNA Target Recognition by a tRNA Pseudouridine Synthase

Project description:We used an in vitro pool based strategy to probe the sequence and structural requirements for mRNA target recognition by the yeast tRNA pseudouridine synthase Pus1.

2019-08-14 | GSE99487 | GEO

Purification, crystallization and preliminary X-ray crystallographic study of the tRNA pseudouridine synthase TruB from Streptococcus pneumoniae.

Project description:The RNA pseudouridine synthase TruB catalyses the isomerization of uridine to pseudouridine (?) at residue 55 of elongator tRNAs. In order to better elucidate the functions of TruB in the formation of pseudouridine, the three-dimensional structure of full-length TruB was determined by X-ray crystallography. Here, the expression, purification, crystallization and preliminary crystallographic analysis of TruB from Streptococcus pneumoniae are reported. The crystal belonged to space group P2, with unit-cell parameters a = 37.65, b = 78.09, c = 56.33 Å, ? = 102.05°, and diffracted to a resolution of 1.7 Å. The crystal is most likely to contain one molecule in the asymmetric unit, with a VM value of 2.40 Å(3) Da(-1).

| S-EPMC3702319 | biostudies-literature

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