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Free hydroxyproline inhibits the formation of protein-bound hydroxyproline from proline to a considerably greater extent than it does the incorporation of proline into protein of auxin-treated Avena coleoptiles. This inhibition is greater in the wall than in the cytoplasmic fraction. In the absence of auxin, free hydroxyproline exerts little or no inhibition of hydroxyproline formation. Furthermore free hydroxyproline has no effect on respiration, RNA synthesis or the incorporation of leucine into protein. Hydroxyproline is not a general inhibitor of metabolism or protein synthesis in Avena coleoptiles.These results suggest that free hydroxyproline may inhibit auxin-induced cell elongation by blocking the formation or utilization of a particular hydroxyproline-rich protein which must be incorporated into the cell wall during auxin-induced wall extension.

Inhibition of Formation of Protein-Bound Hydroxyproline by Free Hydroxyproline in Avena Coleoptiles