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The ribulose 1,5-diphosphate carboxylase from Gonyaulax polyedra Stein. has a half-life of about four hours in buffer, but can be stabilized by the addition of 50% glycerol. The optimum pH is 7.8 to 8.0 and the optimum Mg(2+) concentration is 3 mm. Heavy metal ions (Cu(2+), Hg(2+), Ni(2+), Zn(2+)), EDTA, pyrophosphate, and adenosine triphosphate were strongly inhibitory. Ribulose 1,5-diphosphate carboxylase from Gonyaulax was not cold-sensitive or activated by light activation factor from tomato or Gonyaulax. No difference in the activity of this enzyme was detected when extracts prepared at the maximum and the minimum of the circadian rhythm of photosynthesis were compared. The Km of HCO(3) (-) was also the same (16 to 19 mm).

plant physiology

The Activity of Ribulose Diphosphate Carboxylase in Extracts of <i>Gonyaulax polyedra</i> in the Day and the Night Phases of the Circadian Rhythm of Photosynthesis

The Activity of Ribulose Diphosphate Carboxylase in Extracts of Gonyaulax polyedra in the Day and the Night Phases of the Circadian Rhythm of Photosynthesis