GO:0000171 ribonuclease MRP activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0000171 (ribonuclease MRP activity) describes the catalysis of site-specific RNA cleavage by a catalytic RNA-mediated mechanism, with the A3 site in the ITS1 of pre-rRNA as a key substrate.
• RNase MRP is a ribonucleoprotein complex whose RNA subunit is catalytically active and whose protein components include the shared Pop1 protein and the MRP-specific RMP24 and RMP64 subunits.
• The enzyme functions in pre-rRNA processing and has been linked to additional RNA substrates, including certain tRNAs and telomerase-related RNAs.
• Dysregulation of the RNase MRP RNA component (RMRP) is associated with cancer progression and diabetic cardiomyopathy through lncRNA-dependent mechanisms.
• Exosomal RMRP released from type II alveolar epithelial cells contributes to sepsis-induced immunosuppression in alveolar macrophages.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of RNase MRP subunits and their RNA substrates.
Description
Ribonuclease MRP activity (GO:0000171) is a molecular function defined as the catalysis of site-specific cleavage of RNA through a catalytic RNA-mediated mechanism, with the A3 site in the ITS1 of pre-rRNA as a principal substrate. This activity is carried out by the RNase MRP ribonucleoprotein complex, an evolutionarily conserved enzyme related to RNase P. Because RNase MRP couples a catalytic RNA subunit with multiple protein cofactors, it sits at the intersection of RNA catalysis, ribosome biogenesis, and RNA quality control. For researchers, GO:0000171 matters because defects in RNase MRP components perturb pre-rRNA processing and have been connected to altered cell proliferation, stress responses, and disease-associated lncRNA signaling. The RNA subunit, encoded by RMRP, is also studied as a long non-coding RNA with functions beyond the classical enzymatic complex, including exosomal release and miRNA sponging. Understanding the catalytic core and its protein partners is therefore essential for interpreting both canonical and non-canonical roles of RNase MRP. This article integrates the QuickGO definition with verified PubMed literature to summarize the mechanism, subunit composition, disease links, and experimental strategies used to study ribonuclease MRP activity.
ribonuclease MRP activity At A Glance
| GO ID | GO:0000171 |
|---|---|
| GO term | ribonuclease MRP activity |
| Ontology | molecular_function |
| Synonym | RNase MRP |
| Definition | Catalysis of the site-specific cleavage of RNA by a catalytic RNA-mediated mechanism; substrates include the A3 site in the ITS1 of pre-rRNA. |
| Major function | Site-specific endonucleolytic cleavage of RNA within a ribonucleoprotein complex. |
| Catalytic component | The RNase MRP RNA subunit acts as the catalytic RNA, supported by protein cofactors. |
| Representative protein components | Pop1, RMP24, and RMP64 are associated with the human RNase MRP complex. |
| Related enzyme | RNase MRP is evolutionarily and structurally related to RNase P. |
What Is GO:0000171?
GO:0000171, ribonuclease MRP activity, is the catalysis of site-specific RNA cleavage by a catalytic RNA-mediated mechanism. The best-characterized substrate is the A3 site within the internal transcribed spacer 1 (ITS1) of pre-rRNA, making the activity central to ribosome biogenesis. The synonym RNase MRP reflects the mitochondrial RNA processing history of the enzyme, although the activity is now recognized in additional RNA processing contexts.
Why Is ribonuclease MRP activity Important in Cell Biology?
Ribonuclease MRP activity is important because it executes a defined step in pre-rRNA processing that is required for ribosome assembly and protein synthesis capacity. Beyond this canonical role, the RMRP RNA subunit participates in regulatory and exosomal pathways that influence cancer biology, immune suppression, and cardiac stress responses. Consequently, GO:0000171 provides a functional anchor for interpreting genetic, biochemical, and disease data on RNase MRP components.
• Provides a catalytic RNA-mediated cleavage activity essential for pre-rRNA processing at the A3 site in ITS1.
• Links ribosome biogenesis to cell growth and proliferation through its role in rRNA maturation.
• Shares protein components such as Pop1 with RNase P, connecting two major RNA processing machines.
• The RMRP RNA component is studied as an lncRNA with roles in hepatocellular carcinoma biology.
• Exosomal RMRP from type II alveolar epithelial cells promotes sepsis-induced immunosuppression in alveolar macrophages.
• RMRP is targeted by m6A-mediated degradation in diabetic cardiomyopathy, linking RNase MRP RNA to epitranscriptomic regulation.
• RNase MRP activity has been associated with non-telomeric activities of telomerase-related RNAs.
• tRNA trafficking and processing pathways intersect with RNase MRP-related RNA metabolism.
• The complex is conserved in plants, where RNase MRP RNA and RNase P activity associate with a Pop1p-containing complex.
• CRISPR-based models allow causal testing of individual RNase MRP subunits and their contributions to disease phenotypes.
What Happens During ribonuclease MRP activity?
Recognition of the A3 site in pre-rRNA ITS1
In simple terms: The enzyme finds a specific spot in the precursor ribosomal RNA and prepares to cut it.
RNase MRP activity catalyzes site-specific cleavage of RNA, with the A3 site in the ITS1 of pre-rRNA as a principal substrate. This cleavage event is part of the broader pre-rRNA processing pathway required for ribosome biogenesis. The catalytic RNA subunit provides the site-specific recognition and cleavage chemistry within the ribonucleoprotein complex.
Catalytic RNA-mediated cleavage
In simple terms: The RNA part of the enzyme itself performs the cutting chemistry.
The defining feature of GO:0000171 is that catalysis proceeds through a catalytic RNA-mediated mechanism rather than solely through protein-based catalysis. This places RNase MRP among ribozyme-containing ribonucleoprotein enzymes, similar in principle to RNase P. The protein subunits are thought to stabilize the RNA fold and support substrate positioning.
Assembly with shared and specific protein subunits
In simple terms: The catalytic RNA needs a set of proteins to become a working enzyme.
Human RNase MRP includes the shared Pop1 protein and the MRP-specific components RMP24 and RMP64. In plants, RNase MRP RNA and RNase P activity are associated with a Pop1p-containing complex, indicating conservation of core assembly principles. These protein components are required for stable complex formation and activity in vivo.
Additional RNA substrates and related pathways
In simple terms: The enzyme may act on more than one type of RNA.
Beyond pre-rRNA, RNase MRP-related activities have been discussed in the context of tRNA biology and telomerase-associated non-telomeric functions. These observations broaden the functional scope of RNase MRP beyond a single substrate while the QuickGO definition remains centered on the A3 site in ITS1. Careful biochemical validation is required to distinguish direct substrates from indirect effects.
Key Genes Involved in GO:0000171 ribonuclease MRP activity
The following genes and proteins are directly or functionally associated with ribonuclease MRP activity (GO:0000171) based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RMRP | Encodes the catalytic RNA subunit of RNase MRP | Central to GO:0000171; studied as an lncRNA in cancer, immunity, and cardiac disease |
| POP1 | Shared protein component of RNase MRP and RNase P complexes | Required for complex assembly and activity; conserved in plants |
| RMP24 | MRP-specific protein component identified in human RNase MRP | Defines the human MRP-specific subunit set |
| RMP64 | MRP-specific protein component identified in human RNase MRP | Defines the human MRP-specific subunit set |
| TERT | Telomerase reverse transcriptase with non-telomeric activities | Links RNase MRP-related RNA metabolism to telomerase biology |
| DICER1 | RNA processing enzyme in small RNA pathways | Context for RNA processing networks intersecting with RNase MRP substrates |
| XPO1 | Nuclear export receptor for RNA cargo | Relevant to tRNA and RNA trafficking pathways linked to RNase MRP biology |
| LOS1 | tRNA export factor | Model for RNA trafficking studies related to RNase MRP substrates |
| MTR10 | Nuclear import factor for RNA-binding proteins | Context for RNA localization studies in RNase MRP research |
| NLRP3 | Inflammasome sensor in pyroptosis | Downstream of RMRP regulation in diabetic cardiomyopathy |
| TACR1 | Tachykinin receptor 1 | Target of miRNA-206 regulation downstream of RMRP in hepatocellular carcinoma |
| YTHDF2 | m6A reader mediating RNA degradation | Regulates RMRP stability in diabetic cardiomyopathy |
| MIR206 | MicroRNA-206 | Mediates RMRP-dependent regulation of TACR1 in hepatocellular carcinoma |
| IL-6 | Inflammatory cytokine | Associated with alveolar macrophage immunosuppression involving exosomal RMRP |
| TNF-alpha | Inflammatory cytokine | Associated with immune responses in sepsis models involving RMRP |
| CD63 | Exosomal marker protein | Used to characterize exosomal RMRP release |
| CD81 | Exosomal marker protein | Used to characterize exosomal RMRP release |
How Is ribonuclease MRP activity Regulated?
RNase MRP activity is regulated at multiple levels. The stability of the RMRP RNA transcript is controlled by m6A-dependent degradation mediated by YTHDF2, linking epitranscriptomic marks to RNase MRP RNA abundance. In cancer cells, RMRP levels influence miRNA-206/TACR1 signaling, indicating that downstream regulatory circuits can feed back on RMRP-dependent phenotypes. Exosomal release of RMRP from type II alveolar epithelial cells represents an extracellular regulatory route that affects alveolar macrophage function during sepsis. Protein subunit availability, including Pop1 and MRP-specific components, also constrains complex assembly and activity.
ribonuclease MRP activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RMRP | Hepatocellular carcinoma | RMRP knockout or knockdown in HCC cell lines with miRNA-206/TACR1 readouts |
| RMRP | Sepsis-induced immunosuppression | Exosome transfer models from type II alveolar epithelial cells to alveolar macrophages |
| RMRP | Diabetic cardiomyopathy | YTHDF2 knockout or overexpression with m6A and NLRP3 pyroptosis assays |
| POP1 | RNase MRP complex assembly defects | POP1 knockout cell lines with pre-rRNA processing analysis |
| RMP24/RMP64 | Human RNase MRP-specific subunit function | Knockout and tagged knock-in models to assess complex integrity |
Cancer and hepatocellular carcinoma
RMRP knockdown suppresses hepatocellular carcinoma biological activities via regulation of the miRNA-206/TACR1 axis, implicating RNase MRP RNA in tumor cell proliferation and survival. This positions GO:0000171-related components as candidate modulators of cancer cell phenotypes, although the precise contribution of catalytic activity versus lncRNA function requires further dissection.
Sepsis-induced immunosuppression
Type II alveolar epithelial cells promote sepsis-induced immunosuppression in alveolar macrophages via exosomal lncRNA Rmrp release. This identifies an extracellular, exosome-mediated route by which the RNase MRP RNA component influences immune cell function in acute inflammatory disease.
Diabetic cardiomyopathy
YTHDF2 alleviates diabetic cardiomyopathy by targeting m6A-mediated degradation of lncRNA RMRP and inhibiting NLRP3-dependent pyroptosis. This links RMRP abundance and its epitranscriptomic regulation to cardiac cell death pathways and diabetic heart disease.
From ribonuclease MRP activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is RMRP catalytic activity required for pre-rRNA processing? | RMRP knockout with pre-rRNA processing assays |
| Which protein subunits are essential for RNase MRP stability? | POP1, RMP24, or RMP64 knockout cell lines |
| Does a disease-associated RMRP variant alter RNA cleavage? | Point-mutation knock-in of the variant followed by RNA processing assays |
| Where does RNase MRP localize within cells? | Tagged knock-in of protein subunits with imaging |
| Does RMRP overexpression drive cancer phenotypes? | RMRP overexpression in HCC cell lines with proliferation and miRNA-206/TACR1 readouts |
| How does exosomal RMRP affect macrophages? | Exosome transfer from type II alveolar epithelial cells to macrophages |
How to Study the ribonuclease MRP activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Northern blotting | Pre-rRNA processing intermediates | Assessing A3 site cleavage in ITS1 |
| RT-qPCR | RNA transcript levels | Quantifying RMRP and pre-rRNA species |
| RNA immunoprecipitation | RNA-protein interactions | Identifying RNase MRP complex components |
| Mass spectrometry | Protein composition | Defining MRP-specific subunits such as RMP24 and RMP64 |
| RNA-seq | Global transcriptome changes | Evaluating downstream effects of RMRP perturbation |
| Exosome isolation | Extracellular vesicle cargo | Studying exosomal RMRP transfer to macrophages |
| m6A RNA immunoprecipitation | m6A modification status | Linking YTHDF2 to RMRP stability |
| Fluorescence imaging | Subcellular localization | Visualizing tagged RNase MRP subunits |
RNA processing assays
Pre-rRNA processing can be monitored by northern blotting or RT-qPCR across ITS1 and ITS2 regions to detect the A3 cleavage step associated with GO:0000171. These assays are used to determine whether loss of RNase MRP subunits impairs rRNA maturation.
RNA immunoprecipitation and proteomics
RNA immunoprecipitation followed by mass spectrometry can identify protein components associated with the RNase MRP RNA, including Pop1 and MRP-specific subunits. This approach helps define the composition of the active complex in different cell types.
Transcriptome and small RNA sequencing
RNA-seq and small RNA-seq can reveal global changes in RNA processing and expression following perturbation of RNase MRP components. Such datasets help distinguish direct catalytic targets from downstream regulatory effects.
Exosome isolation and functional transfer
Exosomes can be isolated from conditioned medium and characterized by markers such as CD63 and CD81, then transferred to recipient cells to test functional effects of RMRP. This method is used to study intercellular communication involving the RNase MRP RNA.
How CRISPR Can Be Used to Study GO:0000171 ribonuclease MRP activity
Knockout
CRISPR knockout of RMRP, POP1, RMP24, or RMP64 can be used to test which components are required for ribonuclease MRP activity and pre-rRNA processing. Knockout cell lines provide a clean background for rescue experiments with wild-type or mutant subunits.
Point Mutation
Point mutations in the catalytic RNA or in protein subunit interfaces can be introduced to separate catalytic activity from assembly functions. Such models help determine whether a specific residue or nucleotide is required for cleavage at the A3 site.
Knock-in
Knock-in of epitope tags or fluorescent proteins at endogenous loci enables tracking of RNase MRP subunits and their assembly in live cells. Knock-in of disease-associated variants can reveal allele-specific effects on RNA processing.
Overexpression
Overexpression of RMRP or its protein partners can be used to test gain-of-function phenotypes, including effects on proliferation and downstream signaling such as miRNA-206/TACR1. Overexpression models are also useful for studying exosomal RMRP release and its effects on immune cells.
How EDITGENE Supports ribonuclease MRP activity Research
Researchers studying ribonuclease MRP activity-related genes often need to determine whether a candidate gene is causally involved in RNA processing, complex assembly, or disease phenotypes. EDITGENE provides CRISPR-based cell model services that allow precise manipulation of RNase MRP components and their regulatory partners, enabling reproducible and publication-ready experiments.
Contact EDITGENE today to design your custom CRISPR model for ribonuclease MRP activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID |
|---|
Frequently Asked Questions About ribonuclease MRP activity
What is ribonuclease MRP activity?
Ribonuclease MRP activity (GO:0000171) is the catalysis of site-specific RNA cleavage by a catalytic RNA-mediated mechanism, with the A3 site in the ITS1 of pre-rRNA as a key substrate.
What genes are involved in ribonuclease MRP activity?
Key genes include RMRP, which encodes the catalytic RNA subunit, and POP1, RMP24, and RMP64, which encode protein components of the complex.
What is the GO ID for ribonuclease MRP activity?
The Gene Ontology ID for ribonuclease MRP activity is GO:0000171.
What does RNase MRP stand for?
RNase MRP stands for ribonuclease mitochondrial RNA processing, and it is the synonym for GO:0000171.
How is ribonuclease MRP activity related to pre-rRNA processing?
RNase MRP cleaves the A3 site in the ITS1 of pre-rRNA, a step required for ribosome biogenesis.
Is RMRP a coding or non-coding RNA?
RMRP is a long non-coding RNA that functions as the catalytic RNA subunit of RNase MRP and has additional regulatory roles.
What diseases are linked to RMRP dysregulation?
RMRP dysregulation has been linked to hepatocellular carcinoma, sepsis-induced immunosuppression, and diabetic cardiomyopathy.
How can CRISPR be used to study ribonuclease MRP activity?
CRISPR knockout, point mutation, knock-in, and overexpression models can test the roles of RMRP, POP1, RMP24, and RMP64 in RNA processing and disease.
What protein subunits are specific to human RNase MRP?
RMP24 and RMP64 have been identified as human RNase MRP-specific protein components.
What methods are used to measure ribonuclease MRP activity?
Northern blotting, RT-qPCR, RNA immunoprecipitation, mass spectrometry, and RNA-seq are commonly used to assess RNase MRP function and its effects.
Conclusion
Ribonuclease MRP activity (GO:0000171) is a catalytic RNA-mediated RNA cleavage function essential for pre-rRNA processing and broadly relevant to cell growth, immune regulation, and disease. Its complex composition, including the RMRP RNA and protein subunits such as Pop1, RMP24, and RMP64, provides multiple entry points for mechanistic and translational research. CRISPR-based models combined with RNA processing assays and multi-omics readouts offer a robust path to define how RNase MRP components contribute to normal biology and disease, supporting the development of targeted experimental systems.
References
- 1. Che R et al.. 2025. Identification of RMP24 and RMP64, human ribonuclease MRP-specific protein components.. Cell Rep 44(6):115752 PMID: 40413743
- 2. Liu C et al.. 2026. Type II Alveolar Epithelial Cells Promote Sepsis-Induced Immunosuppression in Alveolar Macrophages via Exosomal lncRNA Rmrp Release.. Adv Sci (Weinh) 13(1):e00376 PMID: 41178622
- 3. Che R et al.. 2025. Identification of Two Elusive Human Ribonuclease MRP-Specific Protein Components.. bioRxiv PMID: 39896489
- 4. Hopper AK et al.. 2003. tRNA transfers to the limelight.. Genes Dev 17(2):162-80 PMID: 12533506
- 5. Majerská J et al.. 2011. Non-telomeric activities of telomerase.. Mol Biosyst 7(4):1013-23 PMID: 21283914
- 6. Hongfeng Z et al.. 2020. lncRNA RMRP knockdown suppress hepatocellular carcinoma biological activities via regulation miRNA-206/TACR1.. J Cell Biochem 121(2):1690-1702 PMID: 31579977
- 7. Krehan M et al.. 2012. RNase MRP RNA and RNase P activity in plants are associated with a Pop1p containing complex.. Nucleic Acids Res 40(16):7956-66 PMID: 22641852
- 8. Xu Y et al.. 2026. YTHDF2 alleviates diabetic cardiomyopathy by targeting m6A-mediated degradation of lncRNA RMRP and inhibiting NLRP3-dependent pyroptosis.. Biochem Pharmacol 248:117860 PMID: 41786050
