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Articles

Synthesis and Transport of Hydroxyproline-rich Components in Suspension Cultures of Sycamore-Maple Cells ¹

^a Michigan State University, Michigan State University-Atomic Energy Commission Plant Research Laboratory, East Lansing, Michigan 48823

Plant cell walls contain a glycoprotein rich in hydroxyproline. To determine how Acer pseudoplatanus L. cells transport this glycoprotein to the wall, the pulse-chase technique was used to follow changes in specific radio-activity of hydroxyproline and proline in isolated, mitochondrial, Golgi, microsomal, soluble protein, and wall fractions. The turnover rates or changes in specific radioactivity of cytoplasmic hydroxyproline in these cell fractions indicated that the bulk of this hydroxyproline was transferred not by the Golgi apparatus but by a smooth membranous component.

¹ The results reported herein were obtained while the author was a National Institute of Health post-doctoral fellow (1-F2-GM22, 422-01). The work was supported by the United States Atomic Energy Commission.