Prof. Ehrenhofer-Murray erforscht derzeit die chemischen Modifikationen von Transfer-RNAs (tRNAs) und deren Funktionen in der Proteinbiosynthese und Zellgesundheit. Ihr aktueller Schwerpunkt liegt auf der Entwicklung und Anwendung von Nanopore-Sequenzierungsmethoden zur direkten Detektion und Kartierung von tRNA-Modifikationen — insbesondere Queuosin, Pseudouridin und anderen hypermodifizierten Nukleosiden. Sie untersucht, wie diese Modifikationen die Translationsgeschwindigkeit regulieren, Proteinfehlfaltung verhindern und neurologische Funktionen beeinflussen, sowie wie sie über die Darmmikrobiota und Ernährung in den Körper gelangen. Diese Erkenntnisse sind relevant für die Diagnostik von Translationsstörungen, die Entwicklung von Biomarkern für neurodegenerative Erkrankungen und möglicherweise für Ernährungs- und Pharmainterventionen.
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Prof. Dr. Ann Ehrenhofer-Murray
HU-FIS-Profil ↗Förderer: DFG Graduiertenkolleg Zeitraum: 08/2013 - 09/2015 Projektleitung: Prof. Dr. Ann Ehrenhofer-Murray
Förderer: DFG Sachbeihilfe Zeitraum: 08/2013 - 07/2016 Projektleitung: Prof. Dr. Ann Ehrenhofer-Murray, Martin Müller
Förderer: Einstein Stiftung Berlin Zeitraum: 08/2013 - 07/2014 Projektleitung: Prof. Dr. Ann Ehrenhofer-Murray
European Journal of Biochemistry · DOI
During DNA replication, transcription and DNA repair in eukaryotes, the cellular machineries performing these tasks need to gain access to the DNA that is packaged into chromatin in the nucleus. Chromatin is a dynamic structure that modulates the access of regulatory factors to the genetic material. A precise coordination and organization of events in opening and closing of the chromatin is crucial to ensure that the correct spatial and temporal epigenetic code is maintained within the eukaryotic genome. This review will summarize the current knowledge of how chromatin remodeling and histone modifying complexes cooperate to break and remake chromatin during nuclear processes on the DNA template.
RNA Biology · DOI
A group of homologous nucleic acid modification enzymes called Dnmt2, Trdmt1, Pmt1, DnmA, and Ehmet in different model organisms catalyze the transfer of a methyl group from the cofactor S-adenosyl-methionine (SAM) to the carbon-5 of cytosine residues. Originally considered as DNA MTases, these enzymes were shown to be tRNA methyltransferases about a decade ago. Between the presumed involvement in DNA modification-related epigenetics, and the recent foray into the RNA modification field, significant progress has characterized Dnmt2-related research. Here, we review this progress in its diverse facets including molecular evolution, structural biology, biochemistry, chemical biology, cell biology and epigenetics.
Molecular and Cellular Biology · DOI
The majority of cytosolic proteins in eukaryotes contain a covalently linked acetyl moiety at their very N terminus. The mechanism by which the acetyl moiety is efficiently transferred to a large variety of nascent polypeptides is currently only poorly understood. Yeast N(alpha)-acetyltransferase NatA, consisting of the known subunits Nat1p and the catalytically active Ard1p, recognizes a wide range of sequences and is thought to act cotranslationally. We found that NatA was quantitatively bound to ribosomes via Nat1p and contained a previously unrecognized third subunit, the N(alpha)-acetyltransferase homologue Nat5p. Nat1p not only anchored Ard1p and Nat5p to the ribosome but also was in close proximity to nascent polypeptides, independent of whether they were substrates for N(alpha)-acetylation or not. Besides Nat1p, NAC (nascent polypeptide-associated complex) and the Hsp70 homologue Ssb1/2p interact with a variety of nascent polypeptides on the yeast ribosome. A direct comparison revealed that Nat1p required longer nascent polypeptides for interaction than NAC and Ssb1/2p. Delta nat1 or Delta ard1 deletion strains were temperature sensitive and showed derepression of silent mating type loci while Delta nat5 did not display any obvious phenotype. Temperature sensitivity and derepression of silent mating type loci caused by Delta nat1 or Delta ard1 were partially suppressed by overexpression of SSB1. The combination of data suggests that Nat1p presents the N termini of nascent polypeptides for acetylation and might serve additional roles during protein synthesis.