L-(?)-Fucose

L-(?)-Fucose (CAS No.: 2438-80-4) is a naturally occurring deoxyhexose monosaccharide widely present as a terminal or core component of N- and O-linked glycans and glycolipids across diverse organisms, where it contributes to the structural diversity and functional specificity of glycoconjugates. In mammalian systems, it plays a critical role in the biosynthesis and modulation of A and B blood group antigen substructures, as well as in selectin-mediated leukocyte–endothelial adhesion, thereby influencing immune cell trafficking and inflammatory responses. L-(?)-Fucose is also a key mediator in host–microbe interactions, impacting microbial colonization and immune recognition through glycan-dependent mechanisms. Functionally, it has been shown to modulate complement lectin pathway activity, including inhibition of CL11-mediated inflammatory signaling, and is associated with regulatory effects on kidney inflammation and tumor growth in preclinical contexts. As an orally active monosaccharide, it is frequently utilized in glycosylation studies, inflammation and oncology research, and investigations of immune cell adhesion and signaling pathways. In vitro and in vivo applications typically employ concentrations or doses tailored to specific experimental systems, often within micromolar to millimolar ranges depending on the biological model and endpoint being evaluated, making it a versatile tool compound for probing glycan-related mechanisms in biomedical research and drug discovery.