BIO NMDCAT

Mucins cross-link via disulfide bonds to form large polymeric networks. Their hydrophilic sugar chains then trap water molecules to form a gel.

Heavily glycosylated proteins form a protective sugar shield on the inner lysosomal membrane, protecting the peptide bonds from proteases.

Unmodified or poorly glycosylated proteins fail the ER quality control check, remain bound to chaperones, and are targeted for ER-associated degradation (ERAD).

PI-PLC specifically hydrolyzes the phosphodiester bond within the GPI anchor, releasing the attached glycoprotein from its lipid tail.

Without the phosphotransferase enzyme, lysosomal proteins lack the mannose-6-phosphate tag needed for sorting, causing them to be misdirected and secreted.

Dolichol phosphate is a long, polyisoprenoid lipid molecule embedded in the ER membrane that serves as the membrane anchor for building the core glycan.

Lipoprotein lipase requires ApoC-II as a co-factor to bind and hydrolyze triacylglycerols within chylomicrons and VLDLs.

Tunicamycin blocks the transfer of N-acetylglucosamine-1-phosphate onto dolichol phosphate, halting the assembly of the core sugar chain.

Many nucleoporins are modified with single O-linked N-acetylglucosamine (O-GlcNAc) residues, which are essential for pore function and transport regulation.

Ferritin is a hollow metalloprotein shell that stores iron atoms safely as ferric oxide mineral cores, preventing oxidative cellular damage.

The central axis of a proteoglycan monomer is a core protein, from which numerous long glycosaminoglycan chains extend outwards.

Sulfated and carboxylated sugars carry negative charges, creating electrostatic fields that draw in water molecules to form a resilient gel.

Proteins are denser than lipids (1.3 g/mL vs. 0.9 g/mL). Particles containing more protein and less lipid exhibit a higher overall density.

Chaperones like calnexin bind to glycoproteins carrying a single terminal glucose, ensuring the protein folds properly before moving on.

Enveloped viruses use host-derived lipids embedded with viral glycoproteins to form a shield that facilitates membrane fusion.

Non-polar triacylglycerols and cholesterol esters aggregate in water; lipoproteins shield them to allow smooth transport through the blood.

Lipoteichoic acids span the thick peptidoglycan layer and use their lipid tails to anchor the wall assembly into the cytoplasmic membrane.

Horseradish peroxidase is a complex conjugated enzyme; it contains an iron-bearing heme group and carries structural carbohydrate chains.

Cancer cells alter their surface glycosylation profiles, which helps them evade immune detection and metastasize to other tissues.