Ribozyme Structures and Mechanisms
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Comparison of the Effects on Mrna and Mirna Stability Arian Aryani and Bernd Denecke*
Aryani and Denecke BMC Research Notes (2015) 8:164 DOI 10.1186/s13104-015-1114-z RESEARCH ARTICLE Open Access In vitro application of ribonucleases: comparison of the effects on mRNA and miRNA stability Arian Aryani and Bernd Denecke* Abstract Background: MicroRNA has become important in a wide range of research interests. Due to the increasing number of known microRNAs, these molecules are likely to be increasingly seen as a new class of biomarkers. This is driven by the fact that microRNAs are relatively stable when circulating in the plasma. Despite extensive analysis of mechanisms involved in microRNA processing, relatively little is known about the in vitro decay of microRNAs under defined conditions or about the relative stabilities of mRNAs and microRNAs. Methods: In this in vitro study, equal amounts of total RNA of identical RNA pools were treated with different ribonucleases under defined conditions. Degradation of total RNA was assessed using microfluidic analysis mainly based on ribosomal RNA. To evaluate the influence of the specific RNases on the different classes of RNA (ribosomal RNA, mRNA, miRNA) ribosomal RNA as well as a pattern of specific mRNAs and miRNAs was quantified using RT-qPCR assays. By comparison to the untreated control sample the ribonuclease-specific degradation grade depending on the RNA class was determined. Results: In the present in vitro study we have investigated the stabilities of mRNA and microRNA with respect to the influence of ribonucleases used in laboratory practice. Total RNA was treated with specific ribonucleases and the decay of different kinds of RNA was analysed by RT-qPCR and miniaturized gel electrophoresis. -
Biophysical and Biochemical Investigations of RNA Catalysis in the Hammerhead Ribozyme
UC Santa Cruz UC Santa Cruz Previously Published Works Title Biophysical and biochemical investigations of RNA catalysis in the hammerhead ribozyme. Permalink https://escholarship.org/uc/item/366835vs Journal Quarterly reviews of biophysics, 32(3) ISSN 0033-5835 Author Scott, WG Publication Date 1999-08-01 DOI 10.1017/s003358350000353x Peer reviewed eScholarship.org Powered by the California Digital Library University of California Quarterly Reviews of Biophysics 32, 3 (1999), pp. 241–284 Printed in the United Kingdom 241 # 1999 Cambridge University Press Biophysical and biochemical investigations of RNA catalysis in the hammerhead ribozyme William G. Scott The Center for the Molecular Biology of RNA and the Department of Chemistry and Biochemistry, Sinsheimer Laboratories, University of California at Santa Cruz, Santa Cruz, California 95064, USA 1. How do ribozymes work? 241 2. The hammerhead RNA as a prototype ribozyme 242 2.1 RNA enzymes 242 2.2 Satellite self-cleaving RNAs 242 2.3 Hammerhead RNAs and hammerhead ribozymes 244 3. The chemical mechanism of hammerhead RNA self-cleavage 246 3.1 Phosphodiester isomerization via an SN2(P) reaction 247 3.2 The canonical role of divalent metal ions in the hammerhead ribozyme reaction 251 3.3 The hammerhead ribozyme does not actually require metal ions for catalysis 254 3.4 Hammerhead RNA enzyme kinetics 257 4. Sequence requirements for hammerhead RNA self-cleavage 260 4.1 The conserved core, mutagenesis and functional group modifications 260 4.2 Ground-state vs. transition-state effects 261 -
Exploring the Structure of Long Non-Coding Rnas, J
IMF YJMBI-63988; No. of pages: 15; 4C: 3, 4, 7, 8, 10 1 2 Rise of the RNA Machines: Exploring the Structure of 3 Long Non-Coding RNAs 4 Irina V. Novikova, Scott P. Hennelly, Chang-Shung Tung and Karissa Y. Sanbonmatsu Q15 6 Los Alamos National Laboratory, Los Alamos, NM 87545, USA 7 Correspondence to Karissa Y. Sanbonmatsu: [email protected] 8 http://dx.doi.org/10.1016/j.jmb.2013.02.030 9 Edited by A. Pyle 1011 12 Abstract 13 Novel, profound and unexpected roles of long non-coding RNAs (lncRNAs) are emerging in critical aspects of 14 gene regulation. Thousands of lncRNAs have been recently discovered in a wide range of mammalian 15 systems, related to development, epigenetics, cancer, brain function and hereditary disease. The structural 16 biology of these lncRNAs presents a brave new RNA world, which may contain a diverse zoo of new 17 architectures and mechanisms. While structural studies of lncRNAs are in their infancy, we describe existing 18 structural data for lncRNAs, as well as crystallographic studies of other RNA machines and their implications 19 for lncRNAs. We also discuss the importance of dynamics in RNA machine mechanism. Determining 20 commonalities between lncRNA systems will help elucidate the evolution and mechanistic role of lncRNAs in 21 disease, creating a structural framework necessary to pursue lncRNA-based therapeutics. 22 © 2013 Published by Elsevier Ltd. 24 23 25 Introduction rather than the exception in the case of eukaryotic 50 organisms. 51 26 RNA is primarily known as an intermediary in gene LncRNAs are defined by the following: (i) lack of 52 11 27 expression between DNA and proteins. -
How Might a Pre-Biotic Ribozyme Catalyze RNA Assembly in an RNA World?
Science Highlight – April 2007 How Might a Pre-biotic Ribozyme Catalyze RNA Assembly in an RNA World? Which came first, nucleic acids or proteins? This question is molecular biology's version of the "chicken-or-the-egg" riddle. Genes made of nucleic acids (DNA or RNA) contain the instructions for making proteins, but enzymes made of proteins are needed to replicate genes. For those who try to understand how life origi- nated, this once seemed an intractable paradox. The discovery 25 years ago that RNA can be enzymatic permits us to speculate that pre-biotic self-replicating molecules may have been RNAs (1,2). This is known as the "RNA World" hypothesis, and with the discovery of RNA catalysis, it is now possible to imagine a prebiotic The L1 Ligase ribozyme at the moment 'RNA World' (or even one populated by early life forms) of bond creation. in which self-replicating ribozymes (RNA-based enzymes that possess the catalytic ability to copy themselves) accomplished both tasks, thus avoiding the potential “chicken-or-the-egg” conundrum (3). But there's a catch. In order to copy RNA, fragments or monomers that have 5'-triphosphates must be ligated together. This is true for modern polymerases, and is also the most likely mechanism by which a ribozyme self-replicase in an RNA World might function. Yet no one has found a modern natural ribozyme that catalyze this The RNA nucleotide triphosphate ligation reaction required reaction (pictured right). for RNA polymerization and self-replication. RNA in vitro evolution and selection has however enabled several research groups to discover RNA sequences that can in fact cata- lyze the required chemical reaction (shown above) for 5'-triphos- phate RNA fragment ligation, and one group has even produced a primitive but functional RNA-based RNA polymerase ribozyme (4). -
RNA Epigenetics: Fine-Tuning Chromatin Plasticity and Transcriptional Regulation, and the Implications in Human Diseases
G C A T T A C G G C A T genes Review RNA Epigenetics: Fine-Tuning Chromatin Plasticity and Transcriptional Regulation, and the Implications in Human Diseases Amber Willbanks, Shaun Wood and Jason X. Cheng * Department of Pathology, Hematopathology Section, University of Chicago, Chicago, IL 60637, USA; [email protected] (A.W.); [email protected] (S.W.) * Correspondence: [email protected] Abstract: Chromatin structure plays an essential role in eukaryotic gene expression and cell identity. Traditionally, DNA and histone modifications have been the focus of chromatin regulation; however, recent molecular and imaging studies have revealed an intimate connection between RNA epigenetics and chromatin structure. Accumulating evidence suggests that RNA serves as the interplay between chromatin and the transcription and splicing machineries within the cell. Additionally, epigenetic modifications of nascent RNAs fine-tune these interactions to regulate gene expression at the co- and post-transcriptional levels in normal cell development and human diseases. This review will provide an overview of recent advances in the emerging field of RNA epigenetics, specifically the role of RNA modifications and RNA modifying proteins in chromatin remodeling, transcription activation and RNA processing, as well as translational implications in human diseases. Keywords: 5’ cap (5’ cap); 7-methylguanosine (m7G); R-loops; N6-methyladenosine (m6A); RNA editing; A-to-I; C-to-U; 2’-O-methylation (Nm); 5-methylcytosine (m5C); NOL1/NOP2/sun domain Citation: Willbanks, A.; Wood, S.; (NSUN); MYC Cheng, J.X. RNA Epigenetics: Fine-Tuning Chromatin Plasticity and Transcriptional Regulation, and the Implications in Human Diseases. Genes 2021, 12, 627. -
SARS-Cov-2 RNA, Qualitative Real-Time RT-PCR (Test Code 39433)
SARS-CoV-2 RNA, Qualitative Real-Time RT-PCR (Test Code 39433) Package Insert For Emergency Use Only For In-vitro Diagnostic Use - Rx Only Intended Use The Quest Diagnostics SARS-CoV-2 RNA, Qualitative Real-Time RT-PCR (“Quest SARS-CoV-2 rRT-PCR”) is a real-time RT-PCR test intended for the qualitative detection of nucleic acid from the SARS-CoV-2 in upper and lower respiratory specimens (such as nasopharyngeal or oropharyngeal swabs, sputum, tracheal aspirates, and bronchoalveolar lavage) collected from individuals suspected of COVID-19 by their healthcare provider. This test is also for use with nasal swab specimens that are self-collected at home or in a healthcare setting by individuals using an authorized home-collection kit when determined to be appropriate by a healthcare provider. This test is for the qualitative detection of nucleic acid from the SARS-CoV-2 in pooled samples containing up to four of the individual upper respiratory swab specimens (nasopharyngeal, mid-turbinate, anterior nares or oropharyngeal swabs) that were collected in individual vials containing transport media from individuals suspected of COVID-19 by their healthcare provider. Negative results from pooled testing should not be treated as definitive. If patient’s clinical signs and symptoms are inconsistent with a negative result or results are necessary for patient management, then the patient should be considered for individual testing. Specimens included in pools with a positive, inconclusive, or invalid result must be tested individually prior to reporting a result. Specimens with low viral loads may not be detected in sample pools due to the decreased sensitivity of pooled testing. -
Kinetic Characterization of Ribozymes Directed Against the Cisplatin
D2001 Nature Publishing Group 0929-1903/01/$17.00/+0 www.nature.com/cgt Kinetic characterization of ribozymes directed against the cisplatin resistance±associated ABC transporter cMOAT/MRP2/ABCC2 Verena Materna, Per Sonne Holm, Manfred Dietel, and Hermann Lage Institute of Pathology, Charite Campus Mitte, Humboldt University Berlin, Berlin D-10117, Germany. The enhanced expression of the human ABC transporter, cMOAT (MRP2/ABCC2), is associated with resistance of tumor cells against platinum-containing compounds, such as cisplatin. Therefore, cMOAT represents an interesting candidate factor for modulation of antineoplastic drug resistance. Two different hammerhead ribozymes, which exhibit high catalytic cleavage activities towards specific RNA sequences encoding cMOAT, were designed. Cleavage sites of these ribozymes are the GUC sites in codons 704 and 708 of the open readingframe in the cMOAT-specific mRNA molecule. Hammerhead ribozymes were in vitro synthesized using bacteriophage T7 RNA polymerase and oligonucleotide primers whereby one primer contains a T7 RNA polymerase promoter sequence. cMOAT-encodingsubstrate RNA molecules were created by a reverse transcription polymerase chain reaction usingRNA prepared from the cisplatin-resistant human ovarian carcinoma cell line A2780RCIS overexpressingthe cMOAT-encoding transcript. In a cell-free system, both anti-cMOAT ribozymes cleaved their substrate in a highly efficient manner at a physiologic pH and temperature. The cleavage reaction was dependent on time and ribozyme:substrate ratio for determining specific kinetic parameters. Cancer Gene Therapy (2001) 8, 176±184 Key words: cMOAT; MRP2; ABCC2; ribozyme; drug resistance; cisplatin. cquirement of resistance to antineoplastic agents, at of a broad range of endogenous and xenobiotic compounds Aconcentrations which were once effective for cancer across the apical canalicular membrane of the hepatocyte.4 chemotherapy, is a major obstacle in the clinical treatment Mutations in the cMOAT-encoding gene were shown to of human malignancies. -
A Tetracycline-Dependent Ribozyme Switch Allows Conditional Induction of Gene Expression in Caenorhabditis Elegans
ARTICLE https://doi.org/10.1038/s41467-019-08412-w OPEN A tetracycline-dependent ribozyme switch allows conditional induction of gene expression in Caenorhabditis elegans Lena A. Wurmthaler1,2, Monika Sack1,2, Karina Gense2,3, Jörg S. Hartig1,2 & Martin Gamerdinger2,3 The nematode Caenorhabditis elegans represents an important research model. Convenient methods for conditional induction of gene expression in this organism are not available. Here 1234567890():,; we describe tetracycline-dependent ribozymes as versatile RNA-based genetic switches in C. elegans. Ribozyme insertion into the 3’-UTR converts any gene of interest into a tetracycline- inducible gene allowing temporal and, by using tissue-selective promoters, spatial control of expression in all developmental stages of the worm. Using the ribozyme switches we established inducible C. elegans polyglutamine Huntington’s disease models exhibiting ligand- controlled polyQ-huntingtin expression, inclusion body formation, and toxicity. Our approach circumvents the complicated expression of regulatory proteins. Moreover, only little coding space is necessary and natural promoters can be utilized. With these advantages tetracycline-dependent ribozymes significantly expand the genetic toolbox for C. elegans. 1 Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany. 2 Konstanz Research School Chemical Biology (KoRS-CB), University of Konstanz, 78457 Konstanz, Germany. 3 Department of Biology, University of Konstanz, 78457 Konstanz, Germany. Correspondence and requests for materials should be addressed to J.S.H. (email: [email protected]) or to M.G. (email: [email protected]) NATURE COMMUNICATIONS | (2019) 10:491 | https://doi.org/10.1038/s41467-019-08412-w | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-019-08412-w nducible regulatory systems are very powerful research tools to single A-to-G point mutation in the catalytic core of the HHR9 Iinvestigate the cellular function of individual genes. -
Molecular Dynamics in the Hairpin Ribozyme: Calculational and Experimental Aspects
MOLECULAR DYNAMICS IN THE HAIRPIN RIBOZYME: CALCULATIONAL AND EXPERIMENTAL ASPECTS By Patrick Omondi Ochieng A DISSERTATION Submitted to Michigan State University in partial fulfilment of the requirements for the degree of Biochemistry and Molecular Biology - Doctor of Philosophy 2015 ABSTRACT MOLECULAR DYNAMICS IN THE HAIRPIN RIBOZYME: CALCULATIONAL AND EXPERIMENTAL ASPECTS By Patrick Omondi Ochieng The increasing role of RNA therapy in targeting diseases has inspired several RNA studies and especially structural RNA. Of interest to many scientists is how such RNA can perform their work with limited functional groups available to RNA. The structural versatility of RNA seems to underscore the importance of dynamics in performing several functions. Ribozymes are a good example of structured RNA involved in RNA backbone cleavage with a range of strategies. Hairpin ribozyme invokes domain-domain docking to activate the cleavage process. The major loop rearrangements observed upon docking, as well as the kinetically unfavorable docking process, both argue for conformational selection by pre-organization of the catalytically-competent active site of the hairpin ribozyme. In this thesis, we sought to study the behavior of loop A in sampling the docked-like conformation as evidence for conformational selection. We addressed three major aims which involved (i) understanding the dynamics in loop A using molecular dynamics simulation as a tool for assessing conformational sampling (ii) determining the right loop A construct for NMR studies and resonance assignments for structure determination and (iii) elucidation of fast and slow dynamics in loop A using NMR relaxation techniques. In aim 1 (Chapter 2), molecular dynamics simulation was used to determine conformational heterogeneity in RNA based on alternate base-pair formation within a subset of residues in the loop region of domain A of the hairpin ribozyme. -
Hammerhead Ribozymes Against Virus and Viroid Rnas
Hammerhead Ribozymes Against Virus and Viroid RNAs Alberto Carbonell, Ricardo Flores, and Selma Gago Contents 1 A Historical Overview: Hammerhead Ribozymes in Their Natural Context ................................................................... 412 2 Manipulating Cis-Acting Hammerheads to Act in Trans ................................. 414 3 A Critical Issue: Colocalization of Ribozyme and Substrate . .. .. ... .. .. .. .. .. ... .. .. .. .. 416 4 An Unanticipated Participant: Interactions Between Peripheral Loops of Natural Hammerheads Greatly Increase Their Self-Cleavage Activity ........................... 417 5 A New Generation of Trans-Acting Hammerheads Operating In Vitro and In Vivo at Physiological Concentrations of Magnesium . ...... 419 6 Trans-Cleavage In Vitro of Short RNA Substrates by Discontinuous and Extended Hammerheads ........................................... 420 7 Trans-Cleavage In Vitro of a Highly Structured RNA by Discontinuous and Extended Hammerheads ........................................... 421 8 Trans-Cleavage In Vivo of a Viroid RNA by an Extended PLMVd-Derived Hammerhead ........................................... 422 9 Concluding Remarks and Outlooks ........................................................ 424 References ....................................................................................... 425 Abstract The hammerhead ribozyme, a small catalytic motif that promotes self- cleavage of the RNAs in which it is found naturally embedded, can be manipulated to recognize and cleave specifically -
Structural Simplicity and Mechanistic Complexity in the Hammerhead Ribozyme
CHAPTER SEVEN Structural Simplicity and Mechanistic Complexity in the Hammerhead Ribozyme Sara M. O’Rourke, William G. Scott1 The Center for the Molecular Biology of RNA, University of California at Santa Cruz, Santa Cruz, CA, United States 1Corresponding author: e-mail address: [email protected] Contents 1. Background and Structural Overview 178 2. Fast Minimal Hammerhead Ribozymes 181 3. Acid-Base Catalysis and the Hammerhead Ribozyme 182 4. Is the Hammerhead Ligation Reaction the Reverse of the Cleavage Reaction? 191 5. Do Cooperative Interactions in the Hammerhead Ribozyme Facilitate General Base Catalysis in the Cleavage Reaction? 194 6. Summary and Concluding Remarks 195 6.1 The Structure of the Hammerhead Ribozyme May Be Much Simpler Than We Have Thought 196 6.2 The Mechanism of the Hammerhead Ribozyme May Be Much More Complicated Than We Have Thought 196 6.3 Concluding Remarks 200 References 201 Abstract Natural or full-length hammerhead ribozymes are up to 1000-fold more active than their minimal counterparts that lack a complex tertiary interaction that pre-organizes and stabilizes the ribozyme active site, positioning RNA functional groups to facilitate acid-base catalysis. The recent discovery that a single tertiary contact (an AU Hoogsteen pair) between Stems I and II confers essentially all of the enhanced activity greatly simplifies our understanding of the structural requirements for hammerhead ribozyme activity. In contrast, the simplest mechanistic interpretations are challenged with the presentation of more complex alternatives. These alternatives are elucidated and criti- cally analyzed in the context of several of the active hammerhead ribozyme structures now available. # Progress in Molecular Biology and Translational Science, Volume 159 2018 Elsevier Inc. -
Rna Ligation by Hammerhead Ribozymes and Dnazyme In
RNA LIGATION BY HAMMERHEAD RIBOZYMES AND DNAZYME IN PLAUSIBLE PREBIOTIC CONDITIONS A Dissertation Presented to The Academic Faculty by Lively Lie In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the School of Biology Georgia Institute of Technology DECEMBER 2015 COPYRIGHT 2015 BY LIVELY LIE RNA LIGATION BY HAMMERHEAD RIBOZYMES AND DNAZYME IN PLAUSIBLE PREBIOTIC CONDITIONS Approved by: Dr. Roger M. Wartell, Advisor Dr. Eric Gaucher School of Biology School of Biology Georgia Institute of Technology Georgia Institute of Technology Dr. Loren D. Williams Dr. Fredrik Vannberg School of Chemistry & Biochemistry School of Biology Georgia Institute of Technology Georgia Institute of Technology Dr. Nicholas Hud School of Chemistry & Biochemistry Georgia Institute of Technology Date Approved: August 13, 2015 ACKNOWLEDGEMENTS First, I would like to thank my family. Without the support of my mother and father, I would not have reached this far. To my husband, I thank him for his patience, love, and his knowledge of programming and computers. I would also like to thank the undergraduate students Rachel Hutto, Philip Kaltman, and Audrey Calvird who contributed to the research in this thesis and the lab technicians Eric O’Neill, Jessica Bowman, and Shweta Biliya, who seemed to know the answers to my troubleshooting. Finally, many thanks goes to my advisor Dr. Roger Wartell, always a helpful, patient, and kind mentor. iv TABLE OF CONTENTS Page ACKNOWLEDGEMENTS iv LIST OF TABLES vii LIST OF FIGURES viii LIST OF SYMBOLS