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Plant Physiology 94:1270-1275 (1990)
© 1990 American Society of Plant Biologists

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Development and Growth Regulation

Phosphorylation of Ribosomal Proteins Induced by Auxins in Maize Embryonic Tissues

Laura Pérez1, Raúl Aguilar, Alma Pérez Méndez and Estela Sánchez de Jiménez

Departamento de Bioquimica, Facultad de Quimica, U.N.A.M. México, D.F. 04510

The effect of auxin on ribosomal protein phosphorylation of germinating maize (Zea mays) tissues was investigated. Two-dimensional gel electrophoresis and autoradiography of [32P] ribosomal protein patterns for natural and synthetic auxin-treated tissues were performed. Both the rate of 32P incorporation and the electrophoretic patterns were dependent on 32P pulse length, suggesting that active protein phosphorylation-dephosphorylation occurred in small and large subunit proteins, in control as well as in auxin-treated tissues. The effect of ribosomal protein phosphorylation on in vitro translation was tested. Measurements of poly(U) translation rates as a function of ribosome concentration provided apparent Km values significantly different for auxin-treated and nontreated tissues. These findings suggest that auxin might exert some kind of translational control by regulating the phosphorylated status of ribosomal proteins.

1 Present address: Depto. de Ciencias de la Salud. División C.B.S. U.A.M.-Iztapalapa Ave. Michoacán y Purisima, Col. Vicentina-Iztapalapa, México, D.F. CP 09340 México.




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Copyright © 1990 by the American Society of Plant Biologists