Cooperative Effects of Light and Temperature on the Activity of Phosphoenolpyruvate Carboxylase from Amaranthus paniculatus L. | Zendy

Eleni Selinioti | Zendy; Yiannis Manetas | Zendy; Nikos A. Gavalas | Zendy

Open Access

Cooperative Effects of Light and Temperature on the Activity of Phosphoenolpyruvate Carboxylase from Amaranthus paniculatus L.

Author(s) -

Eleni Selinioti,

Yiannis Manetas,

Nikos A. Gavalas

Publication year - 1986

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.82.2.518

Subject(s) - phosphoenolpyruvate carboxylase , phosphoenolpyruvate carboxykinase , pyruvate carboxylase , enzyme , chemistry , biochemistry , photosynthesis , biophysics , activation energy , in vivo , botany , biology , microbiology and biotechnology

The phosphoenolpyruvate carboxylase of Amaranthus paniculatus shows in vitro optimum affinity (S(0.5)) to phosphoenolpyruvate at a relatively high temperature (about 35 degrees C); even in the presence of activators, it functions efficiently only above 25 to 27 degrees C. At lower temperatures, a steep increase of activity with temperature is observed, due to the high activation energy for the catalyzed reaction. The same behavior in vivo could amplify the photoactivation of the enzyme to a large extent, since the night/day transition is soon followed by a considerable rise in leaf temperature.

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