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Plant Physiology 68:979-980 (1981) © 1981 American Society of Plant Biologists Hydroxyproline Glycosides in Secretory Arabinogalactan-Protein of Phaseolus vulgaris L. 1Plantenfysiologisch Laboratorium, Universiteit van Amsterdam, Kruislaan 318, 1098 SM Amsterdam, The Netherlands
The carbohydrate moiety of secretory arabinogalactan protein in bean seedlings (Phaseolus vulgaris L. cv. Prélude) is attached to the peptide backbone through hydroxyproline, serine, and threonine. Hydroxyproline-linked side chains, consisting of arabinose, galactose, glucose, and rhamnose, comprise the major part of the sugar residues. These hydroxyproline glycosides differ from those in non-extractable cell wall protein but show similarities with those in wall protein of the alga Chlamydomonas.
2 Present address: Department of Biology, Washington University, St. Louis, MO 63130. 1 These investigations were supported by the Foundation for Fundamental Biological Research (BION), which is subsidized by the Netherlands Organization for the Advancement of Pure Research Z. W. O.
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