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- W1968202857 abstract "We investigated the function of cell wall hydroxyproline-rich glycoproteins by observing the effects of a selective inhibitor of prolyl hydroxylase, 3,4-dehydro-L-proline (Dhp), on wall regeneration by Nicotiana tabacum mesophyll cell protoplasts. Protoplasts treated with micromolar concentrations of Dhp do not develop osmotic stability and do not initiate mitosis. The architecture of regenerated cell walls was examined using deep-etch, freeze-fracture electron microscopy of rapidly frozen tobacco cells. Untreated protoplasts assemble a dense fibrillar cell wall consisting of laterally associating subelementary fibrils. In contrast, treatment of protoplasts with Dhp alters the structure of the regenerated wall fibrils in several ways: first, the microfibrils are coated with globular knobs; second, some larger fiber bundles have an open ribbon-like appearance; and third, the smallest subelementary fibrils were not visible. Tobacco cells develop an abnormal morphology as a consequence of this abnormal cell wall structure. Thus, inhibition of prolyl hydroxylase results in the regeneration of a cell wall with abnormal structural and functional properties. These data provide experimental evidence that hydroxyproline-rich glycoproteins are important for the structural integrity of primary cell walls and for the correct assembly of other wall polymers, and that wall structure is an important regulator of cell division and cell morphology." @default.
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- W1968202857 date "1994-02-01" @default.
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- W1968202857 title "3,4-Dehydroproline Inhibits Cell Wall Assembly and Cell Division in Tobacco Protoplasts" @default.
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- W1968202857 doi "https://doi.org/10.1104/pp.104.2.747" @default.
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