Synthesis of Isocitrate Lyase in Sunflower Cotyledons during the Transition in Cotyledonary Microbody Function | Zendy

Ursula Franzisket | Zendy; Bernt Gerhardt | Zendy

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Synthesis of Isocitrate Lyase in Sunflower Cotyledons during the Transition in Cotyledonary Microbody Function

Author(s) -

Ursula Franzisket,

Bernt Gerhardt

Publication year - 1980

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.65.6.1081

Subject(s) - isocitrate lyase , helianthus annuus , sunflower , microbody , greening , enzyme , biochemistry , biology , glyoxysome , function (biology) , botany , glyoxylate cycle , horticulture , microbiology and biotechnology , ecology , catalase

Density-labeling with 10 millimolar K(15)NO(3)/70% (2)H(2)O has been used to investigate isocitrate lyase synthesis during greening of sunflower (Helianthus annuus L.) cotyledons when the glyoxysomal enzyme activities sharply decline and the transition in cotyledonary microbody function occurs. A density shift of 0.0054 (kilograms per liter) was obtained for the profile of isocitrate lyase activity in the CsCl gradient with respect to the (1)H(2)O control. Quantitative evaluation of the density-labeling data indicates that about 50% of the isocitrate lyase activity present towards the end of the transition stage in microbody function is due to enzyme molecules newly synthesized during this stage.

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