n-linked

Tunicamycin is a mixture of antibiotics that inhibit N-linked glycosylation by blocking GlcNAc phosphotransferase (GPT). Tunicamycin has antitumor activity, as well as anti-bacterial, anti-fungal, and anti-viral activity.

Chitosan (MW 150000) (Deacetylated chitin) is a linear polysaccharide made up of randomly distributed β-(1-4)-linked D-glucosamine (deacetylated unit) and N-acetyl-D-glucosamine.

N-Acetyl-L-arginine (Ac-Arg-OH), an N-acyl-L-alpha-amino acid with a strong basic nature (based on its pKa), has elevated serum levels in hyperargininemic patients and is associated with several diseases, including uremia and colorectal cancer. In untreated hyperargininemic patients, it reaches its highest levels in cerebrospinal fluid. It has also been detected in apples and loquats, suggesting it could be a potential biomarker for consumption of these foods. Additionally, a low-arginine diet combined with sodium benzoate therapy leads to a marked decrease in plasma N-acetyl-L-arginine concentrations.

1-Deoxymannojirimycin hydrochloride, a selective α1,2-mannosidase inhibitor (IC50: 20 μM), also inhibits HIV-1 strains but exhibits poor antiviral activity.

Oxysophoridine (Sophoridine N-oxide) has a protective effect on focal cerebral ischemic injury through antioxidant and anti-apoptotic mechanisms; it may be a potential neuroprotective agent for cerebral ischemia injury, that the effect may be due to its ability to inhibit oxidative stress and expression of the N-methyl-D-aspartate receptor subunit NR1.Oxysophoridine ameliorates cardiac damage in a rat model of AMI and that this cardioprotection may be linked with its anti-oxidative, anti-apoptotic and anti-inflammatory properties.

The acyl amides are a family of endogenous lipids that act as potent modulators of pain and inflammation. The best characterized members of this family are the arachidonoyl amides, which includes N-arachidonoyl ethanolamide (AEA; anandamide). N-palmitoyl glycine (PalGly) contains an 18-carbon saturated fatty acid that is amide-linked to glycine and is structurally similar to the phospholipid-derived N-acyl ethanolamines. Endogenously produced in rat skin and spinal cord, PalGly is present in 100-fold greater amounts in skin and 3-fold greater in brain compared to AEA. Injection of 0.43 μg PalGly in rat hindpaw inhibits heat-induced firing of nociceptive neurons in rat dorsal horn. PalGly treatment induces transient calcium influx in native dorsal root ganglion (DRG) cells and in the PTX-sensitive, DRG-like cell line F-11 (EC50 = 5.5 μM).

Ac-muramic acid (MurNAc) is an essential component of bacterial peptidoglycan, the structural polymer of the cell wall. Ac-muramic acid is covalently linked to N-acetylglucosamine through β-1,4 linkages and may also be connected via the hydroxyl group on carbon-4 to the carbon atom of L-alanine, forming part of the peptide stem. MurNAc is central to bacterial cell wall biosynthesis studies.

N,N'-Diacetylchitobiose, a dimer of β(1,4) linked N-acetyl-D glucosamine, is derived from the hydrolysis of chitin. This compound serves as an alternative carbon source for E. coli.