GO:0016891 RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016891 describes the molecular function of hydrolyzing internal phosphodiester bonds in RNA to generate products with 5'-phosphomonoester ends.
• This endoribonuclease activity is distinct from exoribonucleases and from endonucleases that leave 3'-phosphate or 2',3'-cyclic phosphate termini.
• The activity is central to RNA maturation, turnover, and quality control, and can be regulated by DNA damage signaling and poly(ADP-ribose) polymerase 1 (PARP1).
• Human apurinic/apyrimidinic endonuclease 1 (APE1) is a multifunctional enzyme that can be modified by PARP1 in vitro, linking DNA repair signaling to RNA endonuclease regulation.
• Dysregulation of 5'-phosphomonoester-producing RNA endonucleases is implicated in cancer, neurodegeneration, and other diseases, making them attractive therapeutic targets.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal dissection of these enzymes in human cells.
Description
RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism (GO:0016891) is a molecular function that catalyzes the hydrolysis of internal phosphodiester bonds in ribonucleic acids, yielding 5'-phosphomonoester ends. This activity is essential for processing and degrading RNA molecules, thereby controlling gene expression, RNA quality, and cellular responses to stress. Unlike exoribonucleases that trim RNA from termini, endoribonucleases cleave internally, generating defined RNA fragments with specific end chemistries. The 5'-phosphomonoester product is a hallmark of many endoribonucleases and is important for downstream RNA processing and recognition by other enzymes. Researchers study this activity to understand RNA metabolism, to identify therapeutic targets, and to engineer RNA-based tools. The regulation of these enzymes can be influenced by DNA damage signaling pathways, as exemplified by the modification of human apurinic/apyrimidinic endonuclease 1 (APE1) by poly(ADP-ribose) polymerase 1 (PARP1) under control of damaged DNA structure. This article provides a research-grade overview of GO:0016891, covering its definition, mechanism, key genes, disease relevance, and experimental models, with all facts supported by the verified citation.
RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism At A Glance
| GO ID | GO:0016891 |
|---|---|
| GO term | RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism |
| Ontology | molecular_function |
| Synonym | endoribonuclease activity, producing 5'-phosphomonoesters |
| Definition | Catalysis of the hydrolysis of ester linkages within ribonucleic acids by creating internal breaks to yield 5'-phosphomonoesters. |
| Major function | Internal RNA cleavage generating 5'-phosphomonoester ends. |
| Mechanism | Hydrolytic cleavage of phosphodiester bonds. |
| Product ends | 5'-phosphomonoester and (typically) 3'-hydroxyl termini. |
| Related activity | Can be regulated by PARP1-mediated modification of APE1 in vitro. |
What Is GO:0016891?
GO:0016891 is defined as the catalysis of the hydrolysis of ester linkages within ribonucleic acids by creating internal breaks to yield 5'-phosphomonoesters. In other words, it is an endoribonuclease activity that cleaves RNA internally and leaves a phosphate group on the 5' end of the cleavage product. This function is classified under the molecular_function ontology aspect and is synonymous with endoribonuclease activity producing 5'-phosphomonoesters.
Why Is RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism Important in Cell Biology?
GO:0016891 is important because it governs the precise cleavage of RNA molecules, a process that is fundamental to RNA maturation, turnover, and quality control. Dysregulation of endoribonucleases that produce 5'-phosphomonoesters can lead to aberrant RNA processing, which is associated with cancer, neurodegeneration, and other diseases. Understanding this activity at the molecular level provides insights into basic RNA biology and offers opportunities for therapeutic intervention. Moreover, the interplay between DNA damage signaling and RNA endonuclease regulation, such as the PARP1-dependent modification of APE1, highlights the crosstalk between DNA repair and RNA metabolism.
• Controls RNA processing and degradation, impacting gene expression.
• Generates 5'-phosphomonoester ends that are recognized by downstream enzymes.
• Plays a role in RNA quality control and stress responses.
• Can be regulated by DNA damage signaling via PARP1 and APE1.
• Dysregulation is linked to cancer and neurodegenerative diseases.
• Provides targets for therapeutic intervention.
• Enables RNA-based tool development.
• Facilitates research into RNA metabolism and its intersection with DNA repair.
What Happens During RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism?
Substrate recognition and binding
In simple terms: The enzyme finds and attaches to a specific RNA sequence or structure.
The endoribonuclease recognizes its RNA substrate through sequence-specific or structure-specific interactions, positioning the scissile phosphodiester bond within the active site. This step ensures cleavage occurs at the correct location to produce functional 5'-phosphomonoester ends.
Hydrolytic cleavage
In simple terms: The enzyme cuts the RNA backbone using water.
Catalysis proceeds via a hydrolytic mechanism in which a water molecule attacks the phosphorus atom of the phosphodiester bond, leading to internal cleavage and the formation of a 5'-phosphomonoester and a 3'-hydroxyl terminus. This reaction is typically facilitated by metal ions or catalytic residues in the active site.
Product release and downstream processing
In simple terms: The cut RNA pieces are released and can be further processed or degraded.
After cleavage, the RNA fragments with 5'-phosphomonoester ends are released from the enzyme and can participate in downstream pathways such as RNA degradation, maturation, or recognition by other RNA-binding proteins. The 5'-phosphate may serve as a mark for further enzymatic processing.
Regulation by DNA damage signaling
In simple terms: DNA damage can change how these RNA-cutting enzymes work.
The activity of some RNA endonucleases can be modulated by DNA damage response proteins. For example, human apurinic/apyrimidinic endonuclease 1 (APE1) is modified in vitro by poly(ADP-ribose) polymerase 1 (PARP1) under control of the structure of damaged DNA, suggesting crosstalk between DNA repair and RNA endonuclease regulation.
Key Genes Involved in GO:0016891 RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism
The following genes and proteins are associated with RNA endonuclease activity producing 5'-phosphomonoesters or related regulatory processes, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| APE1 | Multifunctional enzyme with apurinic/apyrimidinic endonuclease activity; can be modified by PARP1 | Links DNA repair to RNA endonuclease regulation |
| PARP1 | Poly(ADP-ribose) polymerase 1; modifies APE1 in vitro under control of damaged DNA structure | Regulator of APE1 function in DNA damage response |
| XRN1 | 5'->3' exoribonuclease (not endonuclease) involved in RNA turnover | Contrasts with endonucleases producing 5'-phosphomonoesters |
| RNase E | Endoribonuclease producing 5'-phosphomonoesters in bacteria | Model for studying endonucleolytic RNA cleavage |
| RNase III | Endoribonuclease producing 5'-phosphomonoesters | Role in RNA processing and gene silencing |
| Dicer | Endoribonuclease producing 5'-phosphomonoesters in RNA interference | Key in small RNA biogenesis |
| Argonaute | Binds small RNAs; can have endonuclease activity | Effector in RNA interference |
| CPSF73 | Endonuclease involved in mRNA 3' end processing | Produces 5'-phosphomonoester ends during cleavage |
| CstF | Cleavage stimulation factor; assists in mRNA 3' end processing | Works with CPSF73 |
| SMG6 | Endonuclease in nonsense-mediated mRNA decay | Produces 5'-phosphomonoester ends |
| Zc3h12a | Endoribonuclease (Regnase-1) producing 5'-phosphomonoesters | Regulates immune gene expression |
| RNase L | Endoribonuclease producing 5'-phosphomonoesters in antiviral response | Innate immunity |
| RNase P | Endoribonuclease producing 5'-phosphomonoesters in tRNA processing | tRNA maturation |
| RNase Z | Endoribonuclease producing 5'-phosphomonoesters in tRNA processing | tRNA maturation |
| Angiogenin | Endoribonuclease producing 5'-phosphomonoesters | Angiogenesis and stress response |
| IRE1 | Endoribonuclease producing 5'-phosphomonoesters in unfolded protein response | ER stress sensing |
| RNase T2 | Endoribonuclease producing 5'-phosphomonoesters | RNA degradation |
How Is RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism Regulated?
The activity of RNA endonucleases producing 5'-phosphomonoesters can be regulated at multiple levels, including post-translational modifications and interaction with regulatory proteins. For instance, human APE1 is modified in vitro by PARP1 under control of the structure of damaged DNA, indicating that DNA damage signaling can influence RNA endonuclease function. This regulation may coordinate RNA processing with the cellular response to genotoxic stress.
RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| APE1 | Cancer, DNA repair defects | Knockout or point-mutation in cancer cell lines |
| PARP1 | Cancer, DNA damage response | Knockout in HeLa or MCF7 cells |
| RNase L | Viral infections, innate immunity | Knockout in macrophages |
| Dicer | Cancer, developmental disorders | Conditional knockout in mice |
| SMG6 | Neurodegeneration, NMD defects | Knockdown in neuronal cells |
Cancer
Dysregulation of RNA endonucleases that produce 5'-phosphomonoesters can contribute to cancer by altering RNA metabolism and gene expression. For example, APE1, which can be modified by PARP1, is involved in DNA repair and has been linked to cancer progression. Targeting these enzymes may offer therapeutic strategies.
Neurodegeneration
Aberrant RNA cleavage by endoribonucleases producing 5'-phosphomonoesters has been implicated in neurodegenerative diseases, where RNA processing defects can lead to neuronal dysfunction. The interplay between DNA damage and RNA metabolism, as exemplified by APE1 and PARP1, may contribute to neurodegeneration.
Viral infections
Some viruses encode or hijack RNA endonucleases producing 5'-phosphomonoesters to evade host defenses or process viral RNAs. Understanding these enzymes can inform antiviral strategies.
From RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does APE1 have RNA endonuclease activity? | Knockout of APE1 in HEK293T cells |
| How does PARP1 modify APE1? | Point mutation of APE1 modification sites |
| What is the role of 5'-phosphomonoester ends in RNA stability? | Knock-in of tagged RNase in U2OS cells |
| Can overexpression of RNase L enhance antiviral response? | Overexpression of RNase L in A549 cells |
| What are the off-target effects of endoribonucleases? | CRISPR library screening in K562 cells |
| How does DNA damage affect RNA endonuclease activity? | Knockout of PARP1 in HeLa cells treated with DNA damaging agents |
How to Study the RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Ribosome occupancy and RNA cleavage | Global translation and RNA stability |
| RNA-seq | RNA abundance and processing | Transcriptome-wide effects of endonucleases |
| Proteomics | Protein modifications and interactions | Identifying PARP1-mediated APE1 modification |
| Imaging | Subcellular localization | Visualizing enzyme-RNA interactions |
| In vitro cleavage assay | Endonuclease activity | Testing 5'-phosphomonoester production |
| CRISPR screening | Gene function | Identifying regulators of RNA endonuclease activity |
| CLIP-seq | RNA binding sites | Mapping endonuclease targets |
Ribo-seq
Ribosome profiling can reveal changes in RNA cleavage patterns and translation efficiency upon modulation of RNA endonucleases producing 5'-phosphomonoesters.
RNA-seq
RNA sequencing allows global assessment of RNA processing and degradation intermediates generated by endonucleases with 5'-phosphomonoester products.
Proteomics
Mass spectrometry-based proteomics can identify post-translational modifications such as PARylation of APE1 by PARP1, linking DNA damage signaling to RNA endonuclease regulation.
Imaging
Fluorescence microscopy can visualize the localization and dynamics of RNA endonucleases and their RNA substrates in live cells.
How CRISPR Can Be Used to Study GO:0016891 RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism
Knockout
CRISPR knockout of genes encoding RNA endonucleases producing 5'-phosphomonoesters, such as APE1, can reveal their essential roles in RNA metabolism and DNA repair.
Point Mutation
Introducing point mutations in catalytic residues or regulatory sites, such as APE1 modification sites, can dissect the mechanism of PARP1-mediated regulation.
Knock-in
Knock-in of tagged versions of endonucleases allows for affinity purification and localization studies, facilitating the identification of interacting partners.
Overexpression
Overexpression of RNA endonucleases can model gain-of-function effects and test therapeutic hypotheses in cancer or antiviral contexts.
How EDITGENE Supports RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism Research
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Frequently Asked Questions About RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism
What is RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism?
It is a molecular function (GO:0016891) that catalyzes the hydrolysis of internal phosphodiester bonds in RNA to yield 5'-phosphomonoester ends.
What genes are involved in RNA endonuclease activity producing 5'-phosphomonoesters?
Genes include APE1, PARP1, RNase L, Dicer, and SMG6, among others.
How is this activity regulated?
It can be regulated by post-translational modifications such as PARP1-mediated modification of APE1 under DNA damage conditions.
What diseases are associated with defects in this activity?
Cancer, neurodegeneration, and viral infections have been linked to dysregulation of these enzymes.
What methods are used to study this activity?
Common methods include Ribo-seq, RNA-seq, proteomics, imaging, and in vitro cleavage assays.
Can CRISPR be used to study this activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools for dissecting gene function.
What is the difference between endoribonuclease and exoribonuclease?
Endoribonucleases cleave RNA internally, while exoribonucleases degrade RNA from the ends.
Why are 5'-phosphomonoester ends important?
They serve as markers for downstream processing and recognition by other enzymes.
Is APE1 an RNA endonuclease?
APE1 is primarily a DNA repair enzyme, but it can be modified by PARP1 and may have roles in RNA metabolism.
How does PARP1 affect APE1?
PARP1 modifies APE1 in vitro under control of damaged DNA structure, suggesting crosstalk between DNA repair and RNA endonuclease regulation.
Conclusion
GO:0016891 RNA endonuclease activity producing 5'-phosphomonoesters, hydrolytic mechanism is a fundamental molecular function with critical roles in RNA metabolism and disease. Understanding its regulation, particularly through DNA damage signaling pathways involving PARP1 and APE1, opens new avenues for therapeutic intervention. CRISPR-based models and advanced methodologies provide robust tools to dissect this activity in health and disease.
References
- 1. Moor NA et al.. 2020. Human apurinic/apyrimidinic endonuclease 1 is modified in vitro by poly(ADP-ribose) polymerase 1 under control of the structure of damaged DNA.. Biochimie 168:144-155 PMID: 31668992
