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Don't freeze! A native chemical ligation–desulfurization strategy has been employed for the convergent synthesis of a library of defined antifreeze glycopeptides and glycoproteins (AFGPs) ranging in size from 1.2 to 19.5 kDa (see picture). These AFGPs possessed the secondary structure of a polyproline type II helix and exhibited significant ice recrystallization inhibition and thermal hysteresis activity.
The O‐glycosylation of Ser and Thr by N‐acetylgalactosamine‐linked (mucin‐type) oligosaccharides is often overlooked in protein analysis. Three characteristics make O‐linked glycosylation more difficult to analyse than N‐linked glycosylation, namely: (a) no amino acid consensus sequence is known; (b) there is no universal enzyme for the release of O‐glycans from the protein backbone; and (c) the density...
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