| 2021 |
Cryo-EM structure of human mtRNase P bound to precursor tRNA revealed that TRMT10C (MRPP1) and SDR5C1 (MRPP2) form a subcomplex that binds conserved mitochondrial tRNA elements including the anticodon loop, and positions the tRNA for methylation; PRORP (MRPP3) is then recruited and activated through interactions with its PPR and nuclease domains to ensure precise pre-tRNA cleavage. |
Cryo-EM structure determination with functional validation |
Nature structural & molecular biology |
High |
34489609
|
| 2018 |
X-ray crystallography and SAXS analyses showed that the TRMT10C N-terminus is involved in tRNA binding and monomer-monomer self-interaction, while the C-terminal SPOUT fold contains key residues for SAM binding and N1-methylation. The entire TRMT10C interacts with MRPP2 (SDR5C1) to form the N1-methylation subcomplex, whereas the full MRPP1-MRPP2-MRPP3 RNase P complex assembles only in the presence of precursor tRNA. |
X-ray crystallography, SAXS, interaction assays, activity assays |
The Journal of biological chemistry |
High |
29880640
|
| 2017 |
TRMT10C (MRPP1) and SDR5C1 (MRPP2) form a tRNA-maturation platform: the MRPP1/2 subcomplex retains the tRNA product after 5'-processing by RNase P, significantly enhances efficiency of ELAC2-catalyzed 3'-processing for 17 of 22 mitochondrial tRNAs, and then presents the nascent tRNA to the mitochondrial CCA-adding enzyme. |
In vitro reconstitution assays with purified proteins and mitochondrial tRNA substrates |
Nucleic acids research |
High |
29040705
|
| 2016 |
Patients with TRMT10C missense variants (p.Arg181Leu and p.Thr272Ala) showed decreased MRPP1 protein levels and increased mt-RNA precursors indicative of impaired mt-RNA processing and defective mitochondrial protein synthesis; lentiviral transduction of wild-type TRMT10C rescued mt-RNA processing and mitochondrial protein synthesis defects. The variants affect MRPP1 protein stability and mt-tRNA processing without affecting m1R9 methyltransferase activity. |
Patient fibroblast functional studies, lentiviral rescue, Northern blotting, mitochondrial protein synthesis assay |
American journal of human genetics |
High |
27132592
|
| 2015 |
TRMT10C interacts with SDR5C1 (MRPP2/HSD10); pathogenic SDR5C1 mutations disrupt homotetramerization of SDR5C1 and/or impair its interaction with TRMT10C, leading to impaired tRNA processing and methylation activities of the mtRNase P complex. |
Biochemical characterization of recombinant mutant proteins, co-immunoprecipitation, enzymatic activity assays |
Nucleic acids research |
High |
25925575
|
| 2015 |
Crystal structure of the MRPP3 (PRORP) nuclease subunit showed a distorted, non-productive active site, leading to the proposed mechanism that PRORP switches to a productive state only upon association with MRPP1 (TRMT10C) and MRPP2 through an induced-fit process when pre-tRNA substrate is present. |
X-ray crystallography of MRPP3, structural analysis |
Nucleic acids research |
Medium |
25953853
|
| 2011 |
MRPP1 (TRMT10C) is essential for mt-tRNA processing (5' end), RNA modification, translation, and mitochondrial respiration; MRPP1 and MRPP3 together process the 5' ends of tRNAs and the 5' non-tRNA-containing site of the CO1 transcript. |
Deep sequencing of transcript ends after siRNA knockdown, Northern blotting, mitochondrial translation assay |
Cell cycle |
High |
21857155
|
| 2011 |
MRPP1 (TRMT10C) is required for the processing of mitochondrial long noncoding RNAs generated from the mitochondrial genome. |
Deep sequencing, Northern blotting, strand-specific qRT-PCR with MRPP1 knockdown |
RNA |
Medium |
22028365
|
| 2014 |
HSD10 (SDR5C1/MRPP2) is required for maintaining normal MRPP1 (TRMT10C) protein levels; knockdown of HSD10 causes reduction in MRPP1 protein (but not MRPP3) and impairs processing of precursor tRNAs from the mitochondrial heavy strand. Ectopic expression of HSD10 restores MRPP1 levels and partially rescues RNA processing. |
siRNA knockdown, ectopic overexpression, Western blotting, patient fibroblast studies, RT-PCR of precursor tRNAs |
Human molecular genetics |
Medium |
24549042
|
| 2019 |
Purified mtRNase P (TRMT10C/MRPP1, MRPP2, MRPP3) recognizes, cleaves, and methylates a subset but not all mitochondrial pre-tRNAs in vitro; addition of SAM (the TRMT10C cofactor) enhances binding and cleavage of some mitochondrial pre-tRNAs, and the presence of MRPP3 can enhance the methylation activity of the MRPP1/2 subcomplex. |
In vitro cleavage and methylation assays with purified recombinant mtRNase P components |
RNA |
Medium |
31455609
|
| 2023 |
Kinetic analysis showed that PRORP (MRPP3) alone can bind pre-tRNAs with nanomolar affinity and cleave some at reduced efficiency without TRMT10C-SDR5C1. The main function of the TRMT10C-SDR5C1 subcomplex is to direct PRORP's nuclease domain to the correct cleavage site, increasing the rate and accuracy of cleavage, likely by compensating for structural erosion of canonical features in mitochondrial tRNAs. |
Kinetic analysis with purified recombinant proteins, 12 different mitochondrial pre-tRNA substrates |
Nucleic acids research |
High |
37779095
|
| 2020 |
Disease-linked mutations in mitochondrial pre-tRNAIle, pre-tRNALeu(UUR), and pre-tRNAMet reduce MRPP1 (TRMT10C)-catalyzed methylation activity (up to ~90% reduction) and 5' end processing by mtRNase P; several mutations weaken pre-tRNA binding affinity (2- to 6-fold higher Ks than wild-type). |
In vitro methylation and cleavage assays with recombinant mtRNase P and disease-mutant pre-tRNA substrates, binding assays |
RNA |
Medium |
33380464
|
| 2016 |
In Drosophila, the MRPP1 ortholog Roswell is essential for development, localizes to mitochondria, and its loss causes defective mitochondrial tRNA processing and mitochondrial dysfunction in vivo. |
Homology-based identification, genetic knockdown/overexpression, immunofluorescence localization, mitochondrial tRNA processing assays, lethality assay |
Nucleic acids research |
Medium |
27131785
|
| 2017 |
Novel HSD17B10 missense mutations (p.V12L and p.V176M) reduce dehydrogenase, methyltransferase, and tRNA processing activities of the MRPP2-TRMT10C complex; p.V12L reduces SDR5C1 stability, while p.V176M impairs kinetics and complex formation with TRMT10C. |
Biochemical characterization of recombinant mutant proteins, enzymatic activity assays, complex formation assays |
Biochimica et biophysica acta. Molecular basis of disease |
Medium |
28888424
|
| 2016 |
A novel HSD17B10 p.K212E mutation impairs SDR5C1-dependent mitochondrial RNase P activities (5'-processing and methylation of purine-9 of mitochondrial tRNAs), suggesting pathogenicity through general mitochondrial dysfunction caused by reduced maturation of mitochondrial tRNAs. |
Functional assays of mitochondrial RNase P activity in patient cells and in vitro with recombinant mutant protein |
RNA biology |
Medium |
26950678
|
| 2024 |
Cryo-EM structures of the mitochondrial RNase Z complex (ELAC2/SDR5C1/TRMT10C) bound to mitochondrial tRNAHis revealed that TRMT10C-SDR5C1 participates in the 3'-processing complex and provides the molecular rationale for the 5'-to-3' tRNA processing order in mitochondria. |
Cryo-EM structure determination of the ELAC2/SDR5C1/TRMT10C complex with tRNA substrate |
The EMBO journal |
High |
39516281
|
| 2025 |
TRMT10C and SDR5C1 specifically facilitate ELAC2-mediated 3'-end processing of structurally degenerate mitochondrial tRNAs lacking the canonical elbow; processing of noncanonical mt-tRNAs depends on direct protein-protein interactions between ELAC2 and TRMT10C rather than direct ELAC2-RNA contacts. This identifies TRMT10C-SDR5C1 as a mitochondrial tRNA maturation platform that compensates for structural erosion of mt-tRNAs. |
Cryo-EM structures of ELAC2 in complex with TRMT10C, SDR5C1, and divergent mt-tRNA substrates; biochemical processing assays |
Nature structural & molecular biology |
High |
39747487
|
| 2025 |
Kinetic analysis showed that TRMT10C-SDR5C1 encases the entire tRNA substrate; mtRNase P processes pre-tRNAs more efficiently with longer 5' extensions and uses a rigid measuring mechanism for cleavage-site selection. Without interactions with the pre-tRNA, TRMT10C-SDR5C1 cannot stimulate cleavage by PRORP, explaining the complex's inability to process D-armless mitochondrial tRNASer(AGY). |
Kinetic analysis with substrate and protein variants, cleavage assays with multiple mitochondrial pre-tRNAs |
Nucleic acids research |
Medium |
41261864
|
| 2024 |
N6AMT1 is required for cytosolic translation of TRMT10C (MRPP1) and PRORP (MRPP3); in the absence of N6AMT1, TRMT10C and PRORP protein levels decrease, RNA processing within mitochondria is impaired, leading to accumulation of unprocessed and double-stranded RNA, preventing mitochondrial protein synthesis. |
Translational profiling, N6AMT1 knockdown/knockout, Western blotting, mitochondrial RNA processing assays |
Proceedings of the National Academy of Sciences |
Medium |
39503847
|
| 2013 |
MRPP1 (TRMT10C) co-immunoprecipitates with P32, a mitochondrial protein that also interacts with RNase H1, suggesting MRPP1 participates in a mitochondrial RNA processing complex. |
Co-immunoprecipitation |
PloS one |
Low |
23990920
|
| 2025 |
A lncRNA-derived micropeptide MRPIP inhibits mtRNase P complex assembly by interacting with HSD17B10 (MRPP2/SDR5C1) at the R25 residue, disrupting HSD17B10 tetramerization and the subsequent HSD17B10-TRMT10C (MRPP1) subcomplex formation, leading to perturbed post-transcriptional RNA processing. |
Protein-protein interaction studies, site-directed mutagenesis, biochemical complex assembly assays |
Molecular cell |
Medium |
40513568
|
| 2025 |
In the context of coronary microembolization, reduced succinylation of TRMT10C (at sites recognized by CPT1A) promotes KPNA4-mediated nuclear import via two NLS sequences (KAKR and KKK(X)10KVKK); nuclear TRMT10C then catalyzes m1A modifications on TAFAZZIN and NLRX1 mRNAs, leading to YTHDF2-mediated decay of these transcripts and consequent inflammation, ROS production, and suppression of mitophagy. |
Subcellular fractionation, nuclear localization signal mutagenesis, m1A-RIP, TRMT10C knockdown and CPT1A overexpression rescue experiments |
International journal of biological sciences |
Medium |
40384859
|
| 2024 |
TRMT10C-mediated m1A methylation of ND5 mRNA is enhanced in an Alzheimer's disease cell model and in AD patients; increased TRMT10C protein levels cause m1A modification of ND5 mRNA leading to translation repression of ND5 and mitochondrial complex I dysfunction. |
m1A methylation mapping, TRMT10C overexpression, mitochondrial function assays, patient sample analysis |
Molecular psychiatry |
Medium |
38287100
|
| 2024 |
HSD17B10 K99 succinylation (mediated by CPT1A) maintains mitochondrial RNase P stability; K99R mutation of HSD17B10 impairs its binding to TRMT10C (MRPP1), disrupts RNase P activity, and induces oxidative stress. ASIV treatment restores HSD17B10-TRMT10C interaction and RNase P activity. |
Succinylated proteomics, site-directed mutagenesis (K99R), co-immunoprecipitation, RNase P activity assay, molecular docking |
Phytotherapy research |
Medium |
39038923
|