Dokumente GGNB - Göttinger Graduiertenzentrum für Neurowissenschaften, Biophysik und molekulare Biowissenschaften nach Gutachter "Tittmann, Kai Prof. Dr."
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Interplay of the COP9 signalosome deneddylase and the UspA deubiquitinase to coordinate fungal development and secondary metabolism
(2019-05-29)Protein half-life is controlled through the ubiquitin-proteasome system (UPS). Proteins are labeled with ubiquitin chains by E3 cullin RING ligases (CRLs) and then degraded by the 26S proteasome. The COP9 signalosome (CSN) ... -
Kinetic Analysis of Mammalian Translation Initiation
(2021-01-22)During translation initiation in mammalian cells, 80S ribosomes are assembled at the translation start site on mRNA via a cap-dependent scanning mechanism. The formation of the 80S initiation complex (IC) is essential for ... -
Kinetic Dissection of Translation Initiation in Prokaryotes.
(2014-01-08)Ribosomes are nucleoprotein complexes which synthesize proteins in the cells. The process of translation can be subdivided into several phases: translation initiation, elongation, termination and ribosome recycling. The ... -
Kinetics of subunit rotation of the ribosome during tRNA-mRNA translocation
(2017-07-25)Ribosome dynamics play an essential role in orchestrating all stages of protein synthesis. Recent biochemical, structural and computational studies have shown large-scale conformational changes of the ribosome, its tRNA ... -
Mechanism of Ribosome Rescue by Alternative Release Factor B
(2020-07-09)Rescue of ribosomes stalled on non-stop mRNAs is essential in bacteria and in the mitochondria of all eukaryotes. The lack of a stop codon causes ribosomes to stall at the 3’ end of mRNA with an empty A site, and specialized ... -
Mechanistic and structural characterization of human L-asparaginases
(2024-04-04)L-asparaginases are therapeutic proteins against acute lymphoblastic leukaemia (ALL), especially in children. As lymphoblastic cells depend on L-asparagine in the blood serum, its depletion by L-asparaginases leads to ... -
Mechanistic Characterization of Transaldolase from <i>Thermoplasma Acidophilum</i> and Preliminary Analysis of the QncN/L-M Protein System from <i>Streptomyces Melanovinaceus</i>
(2018-02-13)The results introduced in the present work are mainly based on the pre-steady state and steady-state analysis supported by structural information from crystallographic studies. Different variants of TacTAL were generated ... -
Molecular Mechanisms of Tau Protein Aggregation Inhibition
(2013-11-11)Of all neurodegenerative diseases, Alzheimer´s Disease is the most widespread dementia syndrome, exhibiting progressive memory loss and intellectual abilities. One of the pathological hallmarks of this disease is associated ... -
Monitoring dynamics of protein nascent chain on the ribosome using PET-FCS
(2020-06-24)The ribosome synthesizes proteins according to the sequence of the messenger RNA (mRNA) by progressively adding amino acids to the C-terminus of the nascent peptide. For a protein to become fully functional, it has to fold ... -
New redox-switches in proteins
(2024-04-26)Regulation of cellular pathways in response to the redox state of a cell is an important regulatory process. A well-established paradigm of redox-sensing is disulfide formation between two cysteine residues and cysteine ... -
New sample preparation techniques of macromolecular complexes for high resolution structure determination using cryo-EM
(2020-04-07)Fatty acids are one of the most abundant lipids in the cell. Cells use them to build biological membranes, as energy reserves and as signaling molecules. Fatty acids are synthesized by a specialized protein machinery called ... -
NMR Spectroscopy of the Tau-Microtubule Interaction
(2015-12-10)Tau is an intrinsically disordered, microtubule associated protein and is responsible for the promotion of microtubule (MT) formation and stabilization. The human Tau protein has six different isoforms, which are expressed ... -
Protein Structure Characterization by Solid-State NMR: Structural Comparison of Mouse and Human alpha-Synuclein Fibrils, Sparse 13C Labeling Schemes, and Stereospecific Assignment of Val and Leu Prochiral Methyl Groups
(2013-04-10)This thesis describes protein structure characterization by solid-state nuclear magnetic resonance (ssNMR), including structural investigation of mouse alpha-synuclein (maS) fibrils and the comparison to human apha-synuclein ... -
Purification of organellar macromolecular complexes for structural biology
(2022-03-14)Photosynthesis is the source of life on Earth. In oxygenic photosynthesis, water and carbon dioxide are converted into organic matter using of solar energy that results in the release of oxygen. PSII, a supra-molecular ... -
Reaction mechanism of hOMPD and CaAAD at atomic resolution
(2019-12-12)Decarboxylation reactions are fundamental processes in the chemistry of the animated world. Thus, the evolution of decarboxylases brought up a stunning array of diverse enzymes utilizing a variety of different mechanisms ... -
Recoding of bacteriophage T4 gene 60 mRNA by programmed translational bypassing
(2020-07-28)During synthesis of a topoisomerase subunit encoded by the gene 60 of bacteriophage T4, the ribosome takes off from a certain codon, slides over a 50-nt non-coding segment of mRNA and resumes translation on a specific ... -
Recognition Elements for Elongation Factor P on the Ribosome
(2019-01-25)Translation elongation is a multi-step process orchestrated by elongation factors. Elongation factors G and Tu are required for each round of translation elongation, whereas elongation factor P is only required to assist ... -
Regulatory interactions of enzymes of the citric acid cycle in Bacillus subtilis
(2013-01-25)In most organisms the tricarboxylic acid (TCA) cycle is a fundamental hub in metabolism. The TCA cycle is the origin and the endpoint of a broad spectrum of intermediates and provides the cell with energy and cellular ... -
Release of a Natural mRNA During Recycling of the Prokaryotic Ribosome
(2023-06-20)Ribosome recycling is the last step of the bacterial translation cycle. The release of the peptide leaves a 70S ribosome with a deacylated tRNA in the P site and the stop codon of the mRNA in the A site. The combined action ... -
Residue level characterization of molecular interactions of intermembrane space domains governing the preprotein import into the mitochondrial matrix
(2014-12-10)Mitochondrial matrix targeting proteins are translated as preproteins (carrying an N-terminal 20-50 residue presequence) in the cytoplasm. Post-translationally, they are imported into the mitochondrial matrix through ...