Controlled cell death is essential for the regulation of the immune system and plays a role in pathogen defense. It is often altered in pathogenic conditions such as cancer, viral infections and autoimmune diseases. The Fas receptor and its corresponding membrane-bound ligand (FasL) are part of the extrinsic apoptosis pathway activated in these cases. A soluble form of FasL (sFasL), produced by ectodomain shedding, displays a diverse but still elusive set of non-apoptotic functions and sometimes even serves as a pro-survival factor. To gather more knowledge about the characteristics of this protein and the impact N-glycosylations may have, access to homogeneous posttranslationally modified variants of sFasL is needed. Therefore, we developed a flexible strategy to obtain such homogeneously N-glycosylated variants of sFasL by applying chemical protein synthesis. This strategy can be flexibly combined with enzymatic methods to introduce more complex, site selective glycosylations.
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http://dx.doi.org/10.1002/chem.202400120 | DOI Listing |
Chemistry
April 2024
Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 38, 1090, Vienna, Austria.
Controlled cell death is essential for the regulation of the immune system and plays a role in pathogen defense. It is often altered in pathogenic conditions such as cancer, viral infections and autoimmune diseases. The Fas receptor and its corresponding membrane-bound ligand (FasL) are part of the extrinsic apoptosis pathway activated in these cases.
View Article and Find Full Text PDFPLoS One
November 2021
Center for Lung Biology, Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Washington, Seattle, Washington, United States of America.
We have previously reported that the 26-amino acid N-terminus stalk region of soluble Fas ligand (sFasL), which is separate from its binding site, is required for its biological function. Here we investigate the mechanisms that link the structure of the sFasL stalk region with its function. Using site-directed mutagenesis we cloned a mutant form of sFasL in which all the charged amino acids of the stalk region were changed to neutral alanines (mut-sFasL).
View Article and Find Full Text PDFJ Neurol Sci
June 2020
Institute of Clinical Neuroimmunology, University Hospital and Biomedical Center, Ludwig-Maximilians University Munich, Munich, Germany.
Infect Genet Evol
January 2019
Unidad de Infección Viral e Inmunidad, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain. Electronic address:
Background: TNFAIP3 is a crucial hepatoprotective factor due to its anti-inflammatory, anti-apoptotic, anti-oxidant and pro-regenerative functions. The aim of this study was to analyze the associations between genetic variants upstream of TNFAIP3 (rs675520, rs9376293 and rs6920220) and liver fibrosis severity and inflammation in HIV/HCV-coinfected patients.
Methods: A cross-sectional study was carried out in 215 HIV/HCV-coinfected patients, who underwent a liver biopsy.
Arthritis Rheumatol
December 2014
Institut de Génétique Moléculaire de Montpellier, CNRS, UMR5535, Université Montpellier Sud de France, Montpellier 1 University, and Lapeyronie Teaching Hospital, Montpellier, France.
Objective: Injection of agonistic anti-Fas antibody has been shown to decrease disease symptoms in mouse models of arthritis. Additionally, membrane-bound FasL (mFasL) has been shown to induce cell death in fibroblast-like synoviocytes (FLS) from rheumatoid arthritis (RA) patients. However, levels of soluble FasL (sFasL) are increased in the joints of RA patients and have been associated with disease severity, indicating that mFasL and sFasL play opposing roles in RA.
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