Publications associées à Nucléoprotéine

Regulation and impact of TERRA R-loops at human telomeres

Telomeres are the nucleoprotein structures found at the ends of linear chromosomes. They ensure that the termini of chromosomes are not inappropriately recognized as sites of DNA damage, and are therefore crucial for genome stability. In spite of the heter ...

EPFL2023

The THO complex counteracts TERRA R-loop-mediated telomere fragility in telomerase(+) cells and telomeric recombination in ALT(+) cells

Joachim Lingner, Rita Valador Fernandes

Telomeres are the nucleoprotein structures at the ends of linear chromosomes. Telomeres are transcribed into long non-coding Telomeric Repeat-Containing RNA (TERRA), whose functions rely on its ability to associate with telomeric chromatin. The conserved T ...

OXFORD UNIV PRESS2023

Substrates and Cyclic Peptide Inhibitors of the Oligonucleotide-Activated Sirtuin 7

Alexander Lund Nielsen

The sirtuins are NAD+-dependent lysine deacylases, comprising seven isoforms (SIRT1-7) in humans, which are involved in the regulation of a plethora of biological processes, including gene expression and metabolism. The sirtuins share a common hydrolytic m ...

Wiley-VCH Verlag GmbH2023

Investigating the composition and recruitment of the mycobacterial ImuA'-ImuB-DnaE2 mutasome

John McKinney, Neeraj Dhar, Zela Alexandria-Mae Martin

A DNA damage-inducible mutagenic gene cassette has been implicated in the emergence of drug resistance in Mycobacterium tuberculosis during anti-tuberculosis (TB) chemotherapy. However, the molecular composition and operation of the encoded 'mycobacterial ...

Elife Sciences Publ Ltd2023

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of chromatin compaction

Beat Fierz, Iuliia Boichenko

The Polycomb repressive complexes PRC1, PRC2, and PR-DUB repress target genes by modifying their chromatin. In Drosophila, PRC1 compacts chromatin and monoubiquitinates histone H2A at lysine 118 (H2Aub1), whereas PR-DUB is a major H2Aub1 deubiquitinase, bu ...

2022

Applying Peptide and Protein Synthesis to Study Post-translational Modifications in Epigenetics and Beyond

Beat Fierz

Epigenetics research focuses on the study of heritable gene regulatory mechanisms that do not involve changes of the DNA sequence. Such mechanisms include post-translational modifications of histone proteins that organize the genome in the nucleus into a n ...

2021

Circadian dynamics of RNA localisation in the mammalian liver

Clémence Yumie Syloun Hurni

Gene expression in eukaryotes is a complex multi-step process. It starts in the nucleus with transcription, the synthesis of a mRNA copy from a DNA template. While in the nucleus, the RNA transcript is subject to multiple co- and post-transcriptional modif ...

EPFL2021

Structural transitions and mechanochemical coupling in the nucleoprotein filament explain homology selectivity and Rad51 protein cooperativity in cellular DNA repair

Daniel Migliozzi

The nucleoprotein filament (NPF) is the fundamental element of homologous recombination (HR), a major mechanism for the repair of double-strand DNA breaks in the cell. The NPF is made of the damaged DNA strand surrounded by recombinase proteins, and its se ...

AMER PHYSICAL SOC2020

Salt enhances the thermostability of enteroviruses by stabilizing capsid protein interfaces

Tamar Kohn, Matteo Dal Peraro, Simon Meister, Alessio Prunotto

Enteroviruses are common agents of infectious disease that are spread by the fecal-oral route. They are readily inactivated by mild heat, which causes the viral capsid to disintegrate or undergo conformational change. While beneficial for the thermal treat ...

American Society for Microbiology2020

Alternative interaction sites in the influenza A virus nucleoprotein mediate viral escape from the importin-alpha 7 mediated nuclear import pathway

Jaume Bonet Martinez, Sebastian Beck

Influenza A viruses are able to adapt to restrictive conditions due to their high mutation rates. Importin-alpha 7 is a component of the nuclear import machinery required for avian-mammalian adaptation and replicative fitness in human cells. Here, we eluci ...

WILEY2019

The yeast C/D box snoRNA U14 adopts a "weak" K-turn like conformation recognized by the Snu13 core protein in solution

Benjamin Marcel Daniel Rothé

Non-coding RNAs associate with proteins to form ribonucleoproteins (RNPs), such as ribosome, box C/D snoRNPs, H/ACA snoRNPs, ribonuclease P, telomerase and spliceosome to ensure cell viability. The assembly of these RNA-protein complexes relies on the abil ...

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER2019

Implication of the box C/D snoRNP assembly factor Rsa1p in U3 snoRNP assembly

Benjamin Marcel Daniel Rothé

The U3 box C/D snoRNA is one key element of 90S pre-ribosome. It contains a 5' domain pairing with pre-rRNA and the U3(B/C) and U3(C'/D) motifs for U3 packaging into a unique small nucleolar ribonucleoprotein particle (snoRNP). The RNA-binding protein Snu1 ...

Oxford University Press (OUP)2017

Genetically encoded multivalent sensors to detect bivalent epigenetic modifications in living stem cells

Aurore Marie-France Delachat

Eukaryotic DNA is organized in the form of chromatin whose basic unit is the nucleosome. The four core histones forming the nucleosome, H2A, H2B, H3 and H4 can be highly post-translationally modified, especially on their N-terminal tail protruding from the ...

EPFL2017

From polymers to gene regulation : a bottom up approach to the bacterial chromatin

Aleksandre Japaridze

DNA molecule is the fundamental component of every living organism, since it encodes the hereditary information. Although the genetic code of almost 200 species has been sequenced, the direct connection between gene sequence, DNA structure and biological f ...

EPFL2015

Upstream Binding of Idling RNA Polymerase Modulates Transcription Initiation from a Nearby Promoter

Giovanni Dietler, Aleksandre Japaridze

The bacterial gene regulatory regions often demonstrate distinctly organized arrays of RNA polymerase binding sites of illdefined function. Previously we observed a module of closely spaced polymerase binding sites upstream of the canonical promoter of the ...

American Society for Biochemistry and Molecular Biology2015

Randomized codon mutagenesis reveals that the HIV Rev arginine-rich motif is robust to substitutions and that double substitution of two critical residues alters specificity

Maroun Bou Sleiman

The binding of the arginine-rich motif (ARM) of HIV Rev protein to its high-affinity site in stem IIB in the Rev response element (RRE) initiates assembly of a ribonucleoprotein complex that mediates the export of essential, incompletely spliced viral tran ...

Wiley-Blackwell2013

A three-state model for the regulation of telomerase by TERRA and hnRNPA1

Joachim Lingner, Sophie Redon, Ivo Zemp

Telomeres, the physical ends of eukaryotic chromosomes, are transcribed into telomeric repeat-containing RNA (TERRA), a large non-coding RNA, which forms an integral part of telomeric heterochromatin. In vitro, naked TERRA molecules are efficient inhibitor ...

Oxford University Press2013

Telomerase repeat addition processivity is increased at critically short telomeres in a Tel1-dependent manner in Saccharomyces cerevisiae

Joachim Lingner

Telomerase is the ribonucleoprotein enzyme that elongates telomeres to counteract telomere shortening. The core enzyme consists of a reverse transcriptase protein subunit and an RNA subunit. The RNA subunit contains a short region that is used as a templat ...

2007