Fungal mannans are located on the exterior of the fungal cell wall, where they interact with the environment and, ultimately, the human host. Mannans play a major role in shaping the innate immune response to fungal pathogens. Understanding the phosphodiester linkage and mannosyl repeat units in the acid-labile portion of mannans is crucial for comprehending their structure/activity relationships and for development of anti-fungal vaccines and immunomodulators. The phosphodiester linkages connect the acid-stable and acid-labile portions of the mannan polymer. Phosphate groups are attached to positions 4 and/or 6 of mannosyl repeat units in the acid-stable portion and to position 1 of mannosyl repeat units in the acid-labile portion. This review focuses on the synthesis of phosphodiester linkages as an approach to the development of mannan glycomimetics, which are based on natural product fungal mannans. Development of successful synthetic strategies for the phosphodiester linkages may enable the production of mannan glycomimetics that elicit anti-fungal immune responses against existing and emerging fungal pathogens, such as Candida albicans and Candida auris.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11650759 | PMC |
http://dx.doi.org/10.1016/j.carres.2024.109325 | DOI Listing |
Chem Res Toxicol
January 2025
University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, Missouri 65211, United States.
Apurinic/apyrimidinic endonuclease 1 (APE1) is a central enzyme in the base excision repair (BER) pathway. APE1 catalyzes incision of the phosphodiester linkage on the 5'-side of apurinic/apyrimidinic (AP) sites during the repair of damaged nucleobases in cellular DNA. Inhibition of this enzyme can potentiate the action of DNA-damaging chemotherapeutic agents.
View Article and Find Full Text PDFJ Chromatogr A
January 2025
Genetics Guided Dementia Discovery (G2D2), Eisai, Inc. 35 Cambridge Park Drive, Suite 200, Cambridge, MA, 02140, USA.
The current study investigates the use of mixed-mode chromatography as a combination of anion-exchange (AEX) and hydrophobic interaction chromatography (HIC) for the analysis and purification of single-stranded antisense oligonucleotides with stereo-controlled phosphorothioate inter- nucleotide linkages. Initially a Scherzo-SS-C18 trimodal stationary phase with reversed-phase/AEX/ cation-exchange (CEX) functionalities is systematically evaluated to reveal the presence of U-shaped retention composed of two retention modes namely AEX and HIC, where the latter was also observed on related trimodal Scherzo SM and SW analogues. For the first time, retention and separation of deprotected oligonucleotides was described on a single mixed-mode column using a combination of AEX and HIC.
View Article and Find Full Text PDFCarbohydr Res
January 2025
Department of Surgery, Quillen College of Medicine, East Tennessee State University, Johnson City, TN37614, USA; Drug Discovery and Synthesis Core, Quillen College of Medicine, East Tennessee State University, Johnson City, TN37614, USA; Center for Inflammation, Infectious Disease and Immunity, Quillen College of Medicine, East Tennessee State University, Johnson City, TN37614, USA.
Proc Natl Acad Sci U S A
December 2024
Department of Chemistry, Stanford University, Stanford, CA 94305.
The key first step in the oligomerization of monomers is to find an initiator, which is usually done by thermolysis or photolysis. We present a markedly different approach that initiates acid-catalyzed polymerization at the surface of water films or water droplets, which is the reactive phase during a wet-dry cycle in freshwater hot springs associated with subaerial volcanic landmasses. We apply this method to the oligomerization of different nucleic acids, a topic relevant to how it might be possible to go from simple nucleic acid monomers to long-chain polymers, a key step in forming the building blocks of life.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Department of Chemistry, Institute for Chemical Epigenetics , Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, Munich, Germany.
2',3'-Cyclic GMP-AMP (cGAMP) is a cyclic dinucleotide second messenger in which guanosine and adenosine are connected by one 3'-5' and one 2'-5' phosphodiester linkage. It is formed in the cytosol upon detection of pathogenic DNA by the enzyme guanosine-monophosphate-adenosine monophosphate synthase (cGAS). cGAMP subsequently binds to the adaptor protein stimulator of interferon genes (STING) to elicit an innate immune response leading to the production of type I interferons and cytokines.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!