Article
Biochemistry & Molecular Biology
Bruno Fauvet, Andrija Finka, Marie-Pierre Castanie-Cornet, Anne-Marie Cirinesi, Pierre Genevaux, Manfredo Quadroni, Pierre Goloubinoff
Summary: This study investigated the collaboration between Hsp90 and Hsp70 in bacteria through comparative proteomic analysis, revealing that bacterial Hsp90 may mediate the degradation of aggregation-prone Hsp70-Hsp40 substrates possibly through the HslUV protease. It was found that the triple mutant Delta KJG showed higher levels of metabolic and respiratory enzymes compared to Delta KJ, indicating a role of Hsp90 in protein homeostasis in bacteria.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2021)
Review
Biochemistry & Molecular Biology
Komal Fatima, Fatima Naqvi, Hooria Younas
Summary: Advancements in biotechnology have led to an increased demand for pure, soluble, and functional proteins, prompting the use of recombinant protein production. Although E. coli is a preferred host due to its cost-effectiveness and simple nutritional requirements, issues such as inclusion body formation due to improper protein folding can arise. To address this, molecular chaperones are commonly used to assist in proper protein folding and improve expression, particularly for proteins that are difficult to produce in E. coli.
CELL BIOCHEMISTRY AND BIOPHYSICS
(2021)
Article
Biotechnology & Applied Microbiology
Cristian Munoz, Marisela Carmona, Omar Luna, Fernando A. Gomez, Constanza Cardenas, Patricio Flores-Herrera, Rodrigo Belmonte, Sergio H. Marshall
Summary: This study identifies bacterial chaperone proteins in exosomes isolated from the serum of Piscirickettsia salmonis-infected Salmo salar specimens. These proteins play a vital role in the survival of bacteria under stress conditions and further investigation could uncover their potential role in bacterial pathogenicity.
ELECTRONIC JOURNAL OF BIOTECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Simon K. Krebs, Marlitt Stech, Felix Jorde, Nathanaeel Rakotoarinoro, Franziska Ramm, Sophie Marinoff, Sven Bahrke, Antje Danielczyk, Doreen A. Wuestenhagen, Stefan Kubick
Summary: This article demonstrates the production and testing of an anti-CD7 RIT in both prokaryotic and eukaryotic cell-free systems. The RIT was built by fusing an anti-CD7 scFv with the toxin domain PE24 and showed effective antigen binding and cell killing on CD7-positive cells. This is the first report of producing an active RIT in E. coli and CHO cell-free systems.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Multidisciplinary Sciences
Gabriela Boufelli de Freitas, Laura Penteado, Mila Meneguelli Miranda, Jose Roberto Filassi, Edmund Chada Baracat, Iara Moreno Linhares
Summary: The serum concentration of the 70 kDa heat shock protein (HSPA1A) is elevated in Brazilian women with breast cancer. Elevated HSPA1A levels are associated with advanced histological tumor grade and cell proliferation index. Further investigation on larger and more varied populations is needed to confirm the potential value of HSPA1A detection in breast cancer diagnosis and progression.
SCIENTIFIC REPORTS
(2022)
Article
Medicine, Research & Experimental
Amir Mirzapour Estabragh, Hamid Mir Mohammad Sadeghi, Vajihe Akbari
Summary: This study evaluated the impact of molecular chaperone co-expression on the soluble expression and purification of scFv antibody fragments. The results showed that co-expression with chaperones and low-temperature cultivation synergistically improved the soluble expression of scFv and increased the yield of purified protein.
ADVANCED BIOMEDICAL RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Lisa Kolano, Daniel Knappe, Angela Berg, Thorsten Berg, Ralf Hoffmann
Summary: Proline-rich antimicrobial peptides (PrAMPs) show promise as potential treatments for infections caused by high-priority human pathogens. Their mechanism of action involves passive diffusion across the outer membrane, active transport through the inner membrane, and inhibition of protein biosynthesis by blocking the ribosome's exit tunnel. However, in vitro data on ribosomal binding and bacterial uptake may not be sufficient to accurately predict the antibacterial activity of PrAMPs, as other factors can also influence their efficacy, such as membrane permeability, transport mechanisms, and secondary targets.
Article
Chemistry, Analytical
Sebastian Schmutzler, Michele Woelk, Ralf Hoffmann
Summary: D-glucose and D-fructose can react with amino groups, leading to proteins glycated at lysine residues. Metabolic diseases like diabetes elevate sugar levels, favoring glycation reactions and the formation of advanced glycation end products (AGEs) linked to diabetic complications and cardiovascular diseases. Current analytical methods for differentiating and quantifying Amadori- and Heyns-modified proteins in complex samples are limited.
ANALYTICAL CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Alexandra Brakel, Andor Krizsan, Renke Itzenga, Carl N. Kraus, Laszlo Otvos, Ralf Hoffmann
Summary: Proline-rich antimicrobial peptide ARV-1502 and its analogs exhibit strong antimicrobial effects against Enterobacteriaceae bacteria. The study reveals that these analogs exert antimicrobial activity by binding to the bacterial 70S ribosome, and the binding site overlaps with other antimicrobial peptides and antibiotics. Substitutions in the ribosomal binding motif affect binding and inhibitory activity, and substitutions with higher hydrophobicity or positive net charge improve ribosome binding, translation inhibition, and bacterial uptake.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Reimund Goss, Daniela Volke, Lina Emilia Werner, Ronja Kunz, Marcel Kansy, Ralf Hoffmann, Christian Wilhelm
Summary: In this study, fucoxanthin chlorophyll protein (FCP) complexes of the centric diatom Thalassiosira pseudonana were prepared using low concentrations of a mild detergent and sucrose gradient ultracentrifugation. Two main FCP fractions were observed in the sucrose gradients, each with different protein, lipid, and pigment composition. Mass spectrometry analysis revealed the presence of the xanthophyll cycle enzyme DDE in both FCP fractions, with higher enrichment in the fraction enriched in FCP-A. In-vitro de-epoxidation assays showed a more pronounced conversion of DD to Dt in the fraction enriched in FCP-A compared to FCP-B.
Article
Medicine, Research & Experimental
Roland Bottger, Po-Han Chao, Nojoud AL Fayez, Griffin Pauli, Anne Nguyen, Lukas Hohenwarter, Nida Bilal, Gubran Khalil Mohammed, Daniel Knappe, Ralf Hoffmann, Shyh-Dar Li
Summary: Excipients in nanomedicines play a critical role in determining product quality, stability, consistency, and safety. This study developed a HPLC method combined with an ELS detector and a UV-vis detector to simultaneously analyze drugs and excipients in nanomedicines. This method can be applied to various nanodrug delivery systems and provides important information for nanomedicine formulation development.
MOLECULAR PHARMACEUTICS
(2022)
Article
Virology
Ji Luo, Alexandra Brakel, Andor Krizsan, Tobias Ludwig, Marina Motzing, Daniela Volke, Nicole Lakowa, Thomas Gruenewald, Claudia Lehmann, Johannes Wolf, Stephan Borte, Sanja Milkovska-Stamenova, Joerg Gabert, Felix Fingas, Markus Scholz, Ralf Hoffmann
Summary: This study developed an ELISA method based on the N-protein to sensitively and specifically detect SARS-CoV-2 specific IgG antibodies in human serum. The method is effective for detecting symptomatic infections and may be useful in identifying previous SARS-CoV-2 infections in vaccinated individuals.
Article
Oncology
Anton De Spiegeleer, Evelien Wynendaele, Amelie Descamps, Nathan Debunne, Bart P. Braeckman, Marjan De Mey, Julie Coudenys, Liesbeth Crombez, Frederick Verbeke, Yorick Janssens, Rekin's Janky, Evy Goossens, Caroline Vlaeminck, Dries Duchi, Vanessa Andries, Emilie Dumas, Mirko Petrovic, Tom van de Wiele, Daniel Knappe, Ralf Hoffmann, Vincent Mouly, Anne Bigot, Lars Vereecke, Filip Van Immerseel, Nele van den Noortgate, Bart De Spiegeleer, Dirk Elewaut
CLINICAL AND TRANSLATIONAL MEDICINE
(2022)
Article
Biochemical Research Methods
Pei Su, Ziyan Warneke, Daniela Volke, Michael F. Espenship, Hang Hu, Sebastian Kawa, Kaplan Kirakci, Ralf Hoffmann, Julia Laskin, Christian Wiebeler, Jonas Warneke
Summary: This study investigates the collision-induced dissociation (CID) of [Mo6X14]2- (X = Cl, Br, I) and the reactivity of fragment ions with background gases. Ion mobility measurements and theoretical calculations provide structural information. Sequential losses of MoX2 units dominate the dissociation pathways for [Mo6Cl14]2-, while loss of X radicals is the main channel for X = Br and I. Variation in mass spectra obtained using CID is observed among mass spectrometers. Ion-trap fragmentation combined with theoretical investigations indicates spontaneous losses of X radicals upon binding of O2 to [Mo6Im]- fragments (m <= 12).
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2023)
Article
Engineering, Biomedical
Gubran Khalil Mohammed, Roland Bottger, Andor Krizsan, Daniela Volke, Marina Moetzing, Shyh-Dar Li, Daniel Knappe, Ralf Hoffmann
Summary: The prodrug strategy of linking polyethylene glycol (PEGs) with proline-rich AMP Onc72 is tested for the first time in vivo. The PEGylation protects Onc72 from degradation and provides a prolonged release, leading to stable Onc72 concentrations and high antibacterial activities. The prodrugs show promising safety margins and extended elimination half-life in mice.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Microbiology
Mandy Schwarze, Ji Luo, Alexandra Brakel, Andor Krizsan, Nicole Lakowa, Thomas Gruenewald, Claudia Lehmann, Johannes Wolf, Stephan Borte, Sanja Milkovska-Stamenova, Joerg Gabert, Markus Scholz, Ralf Hoffmann
Summary: This study investigated the antibody response against SARS-CoV-2 proteins using ELISA and found that the RBD-ELISA had high sensitivity and specificity, while the M- and N-protein ELISAs had lower sensitivity. Combining the data from different proteins improved the overall sensitivity.
Article
Biochemistry & Molecular Biology
Kyle Mangano, Dorota Klepacki, Irueosa Ohanmu, Chetana Baliga, Weiping Huang, Alexandra Brakel, Andor Krizsan, Yury S. Polikanov, Ralf Hoffmann, Nora Vazquez-Laslop, Alexander S. Mankin
Summary: The antimicrobial peptide Drosocin (Dro) from fruit flies inhibits protein synthesis by arresting ribosomes at stop codons, similar to apidaecin (Api) from honeybees. However, the interactions of Dro and Api with the ribosome target are distinct, with Dro relying on multiple amino acid residues throughout the PrAMP. Single-residue substitutions can enhance Dro's on-target activity.
NATURE CHEMICAL BIOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Marina Moetzing, Matthias Blueher, Thomas Grunwald, Ralf Hoffmann
Summary: This study aimed to develop a sensitive and clinically applicable ELISA method for the quantification of the glycation site HSAK414 in plasma samples. An indirect ELISA method was established using the generated antibody mAb 50D8, demonstrating good antibody performance and precision. The reliability and correlation of the method were validated by comparing with results from liquid chromatography-mass spectrometry. The study suggests that the glycation site HSAK414 could be a potential biomarker for diabetes mellitus, and ELISA is a suitable method for high-throughput screening and routine laboratory analysis.
Article
Chemistry, Analytical
Sebastian Schmutzler, Michele Woelk, Ralf Hoffmann
Summary: D-glucose and D-fructose in mammals can react with amino groups, leading to glycated proteins. Metabolic diseases like diabetes elevate sugar levels, favoring glycation and the formation of advanced glycation end products (AGEs) linked to complications. Current analytical methods for differentiating and quantifying Amadori- and Heyns-modified proteins in complex samples are limited.
ANALYTICAL CHEMISTRY
(2022)