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NMR Studies of Dynamic Double-Stranded RNA Recognition by RNA Binding Proteins

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NMR Studies of Dynamic Double-Stranded RNA Recognition by RNA Binding Proteins Technische Universität München Lehrstuhl für Biomolekulare NMR-Spektroskopie Bayerisches NMR-Zentrum Chemie Department NMR studies of dynamic double-stranded RNA recognition by RNA binding proteins Jan-Niklas Tants Vollständiger Abdruck der von der Fakultät für Chemie der Technischen Universität München zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften genehmigten Dissertation. Vorsitzende: Prof. Dr. Kathrin Lang Prüfer der Dissertation: 1. Prof. Dr. Michael Sattler 2. Prof. Dr. Klaus Förstemann Die Dissertation wurde am 26.06.2017 bei der Technischen Universität München eingereicht und durch die Fakultät für Chemie am 20.12.2017 angenommen. „To see the world, things dangerous to come to, to see behind walls, draw closer, to find each other, and to feel. That is the purpose of life.“ (James Thurber, The Secret Life of Walter Mitty) Abstract Abstract Ribonucleoproteins (RNP) comprising a protein and a nucleic acid component are diverse complexes involved in various regulatory processes within a cell. Protein-RNA interaction usually is key for proper function and the recognition of RNA can range from complete unspecific binding to high sequence or shape specificity. For this purpose distinct RNA recognition motifs have evolved and are either an integral part of a larger protein or protein complex or a solely RNA binding protein (RBP). Many RNA binding proteins comprise multiple RNA binding domains (RBD) and considerable dynamics within the protein and RNPs are often an intrinsic and important feature. In this thesis a major theme is double-stranded RNA (dsRNA) recognition by different proteins. For this work NMR is used as a powerful tool to obtain information especially on dynamic systems and is combined with other biophysical techniques. RNA interference (RNAi) is a pivotal tool for cells to regulate protein synthesis posttranscriptionally either via mRNA cleavage or inhibition of translation. A double-stranded RNA is processed by tightly regulated protein complexes into a single-stranded effector short interfering (siRNA) or microRNA (miRNA). The RNA induced silencing complex (RISC) comprising an Argonaute protein (Ago) and the single-stranded RNA (ssRNA) binds sequence- specifically to RNA targets and initiates subsequent degradation, inhibits translation or serves in viral defense. Important factors in processing of dsRNA are double-stranded RNA binding proteins (dsRBP). These multidomain proteins exhibit different functions and show a dynamic and usually sequence-independent binding. In the main project of this thesis I show that Loquacious-PD (Loqs-PD), a Drosophila dsRBP, could serve as a sensor for siRNA asymmetry which is a crucial step when converting dsRNA into single-stranded siRNA. Furthermore, I confirm the dynamic binding of Loqs-PD to its RNA substrates and provide a semi-quantitative NMR-based analysis of sliding. Another possibility to control translation is directed messenger RNA (mRNA) localization. Using motor proteins and complex networks of microtubules and filaments as cellular highways mRNAs are transported to designated cellular compartments which allows spatial control of protein expression. One protein involved in mRNA transport within the I Abstract nervous system is the dsRBP Staufen-2 of M. musculus. It is crucial for memory formation and recognizes stem loop structures within the RNAs as localization signals. In this thesis I could confirm that double-stranded RNA binding domain 1 (dsRBD1) and 2 of Staufen-2 are independent of each other and contribute to dsRNA binding. Additionally, binding seems to be accompanied by dynamics as shown before for Loqs. Besides RNA interference and RNA localization the degradation of RNA is another option for translational control. Distinct RNA degradation pathways exist that strictly control RNA turnover but are also crucial for processing of functional precursor RNAs: The S. cerevisiae exosome contributes to ribosomal precursor tRNA maturation. As an unspecific degradation machinery the exosome requires tight control and regulation by various co- factors. One of these, the helicase Mtr4, enables the exosome to degrade and process structured RNAs after unwinding of the substrates. Mtr4 comprises an usual insertion which contributes to RNA binding. In this work I prove that this so called KOW domain binds structured RNAs and tRNAs. Binding to Nop53, an exosome recruiter that directs the complex to the ribosome, occurs via a distinct interface and allows simultaneous binding of both ligands to the domain. II Zusammenfassung Zusammenfassung Ribonukleoproteine (RNP) bestehen aus einem Protein und einer Nukleinsäure- Komponente und bilden vielfälftige Komplexe die in unterschiedlichen regulatorischen Prozessen der Zelle involviert sind. Üblicherweise sind Protein-RNA-Interaktionen entscheidend für die Funktion der Komplexe und die RNA-Erkennung variiert von unspezifischer Bindung bis hin zu hoher Sequenz- oder Struktur-Spezifizität. Daher entwickelten sich differenzierte RNA-Erkennungs-Motive, die entweder ein integraler Bestandteil eines gröβeren Proteins bzw. Proteinkomplexes sind oder einzig ein RNA- bindendes Protein (RBP) darstellen. Viele RNA-bindende Proteine beinhalten mehrere RNA- bindende Domänen (RBD) und dynamische Veränderungen innerhalb der Proteine und Ribonukleoproteine sind wichtige intrinsische Eigenschaften. Das Hauptthema dieser Thesis ist die Erkennung doppelsträngiger RNA (dsRNA) durch verschiedene Proteine. Für diese Arbeit wurde NMR als ideales Werkzeug für dynamische Systeme eingesetzt um Informationen über die Komplexe zu erhalten und wurde durch weitere biophysikalische Methoden ergänzt. RNA-Interferenz (RNAi) ist ein wichtiges Werkzeug für Zellen um die Proteinsynthese posttranskriptionell zu regulieren. Dies geschieht entweder durch den Abbau von mRNA oder Inhibition der Translation. Eine doppelsträngige RNA wird durch streng regulierte Proteinkomplexe in eine einzelsträngige, funktionsfähige, kurze interferierende (siRNA) oder microRNA (miRNA) umgewandelt. Der RNA-induzierte Silencing Komplex (RISC) besteht aus einem Argonautenprotein (Ago) und dieser einzelsträngigen RNA (ssRNA) und bindet sequenzspezifisch an Ziel-RNAs. Dadurch initiiert der RISC den RNA-Abbau, inhibiert die Translation oder fungiert als Abwehr gegen Viren. Wichtige Faktoren für die Prozessierung der dsRNA sind doppelsträngige-RNA-bindende Proteine (dsRBP). Diese Multidomänen- Proteine haben vielfältige Funktionen und binden üblicherweise sequenzunabhängig und dynamisch an RNAs. In dem Hauptprojekt dieser Arbeit zeige ich, dass Loquacious-PD (Loqs- PD), ein dsRBP aus der Fruchtfliege Drosophila, als Sensor für siRNA-Asymmetrie dienen kann. Dies ist ein entscheidender Schritt bei der Umwandlung von doppelsträngiger zu einzelsträngiger siRNA. Des Weiteren konnte ich das dynamische Binden von Loqs-PD an RNA- III Zusammenfassung Substraten belegen und stelle eine semi-quantitative NMR-basierte Analyse des sogenannten Slidings vor. Eine weitere Möglichkeit die Translation zu kontrollieren stellt gerichtete Lokalisierung von messenger RNA (mRNA) dar. Mit Hilfe von Motorproteinen und komplexen Netzwerken aus Mikrotubuli und Filamenten als einer Art zellulärer Schnellstraβe werden mRNAs in bestimmte zelluläre Bereiche transportiert, was die räumliche Kontrolle der Proteinexpression erlaubt. Ein Protein im mRNA-Transport im Nervensystem ist das dsRBP Staufen-2 aus der Hausmaus M. musculus, welches wichtig ist für die Gedächtnisbildung. Staufen-2 erkennt Stamm-Schlaufen-Strukturen innerhalb der RNAs als Lokalisierungssignal. In dieser Thesis konnte ich bestätigen, dass die doppelsträngige-RNA-bindende Domänen 1 (dsRBD1) und 2 von Staufen-2 unabhängig voneinander sind und beide dsRNA binden. Zusätzlich scheint die RNA-Bindung, wie zuvor für Loqs beschrieben, dynamisch zu sein. Neben RNA-Interferenz und der Lokalisierung von RNA bildet der RNA-Abbau eine weitere Möglichkeit der translationalen Kontrolle. Es existieren verschiedene RNA-Abbau- Wege die den RNA-Umsatz kontrollieren und an der Prozessierung von funktionalen RNA- Vorläufern beteiligt sind: Das Exosom der Bäckerhefe S. cerevisiae trägt zur Reifung ribosomaler Vorläufer-tRNAs bei. Als eine unspezifische Degradations-Maschinerie muss das Exosom streng durch zahlreiche Kofaktoren kontrolliert werden. Einer dieser Faktoren, die Helikase Mtr4, ermöglicht dem Exosom nach Entfaltung der Substrate den Abbau strukturierter RNAs. Mtr4 beinhaltet eine ungewöhnliche Einfügung die ebenfalls zur RNA- Bindung beiträgt. In dieser Arbeit belege ich, dass diese sogenannte KOW-Domäne strukturierte RNAs und tRNAs bindet. Die Bindung an Nop53, welches das Exosom rekrutiert und zum Ribosom führt, erfolgt über eine andere Stelle an KOW und ermöglicht dadurch das gleichzeitige Binden beider Liganden an KOW. IV Table of Contents Table of Contents Abstract .................................................................................................................................................... I Zusammenfassung ................................................................................................................................. III Table of Contents .................................................................................................................................... V List of Figures ......................................................................................................................................... IX List of Tables .........................................................................................................................................
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