N-acetylglucosamine (GlcNAc) functions in cell signaling

Area of Science:

• Biochemistry
• Cell Biology
• Microbiology

Background:

• N-acetylglucosamine (GlcNAc) is a fundamental amino sugar.
• It plays crucial structural roles in bacterial peptidoglycan, fungal chitin, and animal extracellular matrix.
• Emerging evidence highlights GlcNAc's significant involvement in cellular signaling pathways.

Purpose of the Study:

• To review the emerging roles of GlcNAc in cellular signaling across diverse organisms.
• To explore GlcNAc's function as an activator and mediator in biological pathways.
• To consolidate current understanding of GlcNAc's impact on microbial and animal cell functions.

Main Methods:

• Literature review of recent studies on GlcNAc.
• Analysis of GlcNAc's impact on morphogenesis, virulence, and biofilm formation in microbes.
• Examination of GlcNAc's role in protein post-translational modifications (glycosylation) in animal cells.

Main Results:

• GlcNAc modulates morphogenesis and virulence gene expression in Candida albicans.
• It influences fimbriae and CURLI fiber expression in pathogenic E. coli, impacting biofilm formation.
• GlcNAc affects intracellular signaling proteins (e.g., NFκB, c-myc, p53) via O-linked glycosylation and alters Notch receptor specificity through fucose residue modification.

Conclusions:

• GlcNAc is a critical signaling molecule in fungi, animals, and bacteria.
• Its roles extend beyond structural functions to actively mediate and activate cellular signaling.
• Further research into GlcNAc's signaling functions is warranted to understand its broad biological impact.