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Rudp carboxylase

RuDP carboxylase --> ribulose bisphosphate carboxylase

(Science: enzyme) A copper protein that catalyses the formation of 2 moles of 3-phosphoglycerate from ribulose 1,5-biphosphate in the presence of carbon dioxide and is responsible for carbon dioxide fixation in photosynthesis.

carbon dioxide is combined with ribulose diphosphate to give two molecules of 3 phosphoglycerate, as part of the calvin Benson cycle. It is the sole carbon dioxide fixing enzyme in c3 plants and collaborates with pEP carboxylase in carbon dioxide fixation in c4 plants.

In the presence of oxygen the products of the reaction are one molecule of phosphoglyceric acid and one molecule of phosphoglycolic acid. The latter is the initial substrate for photorespiration and this oxygenase function occurs in C3 plants where the enzyme is not protected from ambient oxygen, in C4 plants the enzyme acts exclusively as a carboxylase since it is protected from oxygen.

Also called fraction 1 protein, the major protein of leaves.

Chemical name: 3-Phospho-D-glycerate carboxy-lyase (dimerizing)

Registry number: EC 4.1.1.39


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C3 and C4 plants

... under higher temperatures, occurs a process called fotorespiration. RuDP-carboxylase(the enzime that fixes CO2 in c3 plants) has a hish afinity for oxygen. Under high ...

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by MrMistery
Tue Mar 29, 2005 6:39 pm
 
Forum: Botany Discussion
Topic: C3 and C4 plants
Replies: 38
Views: 348121

C3 and C4 plants

... types of plants: C3, C4 and CAM As protozoan pointed out C3 plants use RuDP carboxylase to fix CO2 and the first organic molecule created is phosphoglycerat(this thing ...

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by MrMistery
Wed Mar 16, 2005 8:25 pm
 
Forum: Botany Discussion
Topic: C3 and C4 plants
Replies: 38
Views: 348121


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