Arabinogalactan?like Glycoproteins from <i>Ulva lactuca</i> (Chlorophyta) Show Unique Features Compared to Land Plants AGPs

Arabinogalactan proteins (AGPs) encompass a diverse group of plant cell wall proteoglycans, which play an essential role in development, signaling, plant-microbe interactions, and many others. Although they are widely distributed throughout the kingdom extensively studied, remain largely unexplored lower plants, especially seaweeds. Ulva species have high economic potential since various applications were previously described including bioremediation, biofuel production, as source bioactive compounds. This article presents first experimental confirmation AGP-like glycoproteins provides simple extraction protocol lactuca glycoproteins, their partial characterization unique comparison to scarcely Solanum lycopersicum AGPs. The reactivity with primary anti-AGP antibodies well Yariv reagent showed great variety between glycoproteins. While amino acid analysis purified by ?-d-glucosyl similarity algal land neutral saccharide revealed glycosylation Surprisingly, arabinose galactose not most prevalent monosaccharides outstanding was presence 3-O-methyl-hexose, has never been exceptional structure implies specialized adaptation marine environment might bring new insight into evolution wall.