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PEP carboxylase

Definition

noun

An enzyme in the carboxylases responsible for the formation of the four-carbon compound oxaloacetate by catalyzing the binding of one molecule of carbon dioxide to the three-carbon compound phosphoenolpyruvate.


Supplement

PEP carboxylase is vital in CAM and C4 plants during photosynthesis. It serves as the catalyst for the following chemical reaction:

PEP + CO2oxaloacetate + Pi


Word origin: from the abbreviation of phosphoenolpyruvate carboxylase

Variant: PEPC, PEPCase

See also: CAM plant, C4 plant


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Heterotrophs and Carbon Fixation

... another pyruvate to produce oxaloacetate (by the action of pyruvate carboxylase and PEP-carboxykinase enzymes). At this stage, we obtain 2 equivalent of oxaloacetate where both ...

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by victor
Fri Oct 31, 2008 1:35 pm
 
Forum: Microbiology
Topic: Heterotrophs and Carbon Fixation
Replies: 7
Views: 7295

C4 and photorespiration

... oxygen. This is done by an accesory fixation pathway: the enzyme PEP carboxylase first fixes CO2 onto Phosphoenolpyruvate(PEP) to give phosphate and oxaloacetate ...

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by MrMistery
Wed Sep 24, 2008 2:25 am
 
Forum: Botany Discussion
Topic: C4 and photorespiration
Replies: 1
Views: 3760

Effects of CO2 on the Calvin Cycle

... two graphs to compare, but i would say that in C3. cause C4 plants have PEP carboxylase that has a higher aphinity for CO2(actually for HCO3-) ahh yes yes of courseeeeeee

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by xRadio
Thu Oct 18, 2007 1:56 am
 
Forum: Botany Discussion
Topic: Effects of CO2 on the Calvin Cycle
Replies: 10
Views: 7137

Effects of CO2 on the Calvin Cycle

... two graphs to compare, but i would say that in C3. cause C4 plants have PEP carboxylase that has a higher aphinity for CO2(actually for HCO3-)

See entire post
by MrMistery
Wed Oct 17, 2007 9:02 am
 
Forum: Botany Discussion
Topic: Effects of CO2 on the Calvin Cycle
Replies: 10
Views: 7137

TO ANYBODY THAT HAS ANYQUESTIONS ON PHOTOSYNTHESIS

... begins with RuBP, C-4 begins with a new molecule, phosphoenolpyruvate (PEP), a 3-C chemical that is converted into oxaloacetic acid (OAA, a 4-C ... The capture of carbon dioxide by PEP is mediated by the enzyme PEP carboxylase, which has a stronger affinity for carbon dioxide than does RuBP ...

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by CoolJay221
Thu Feb 09, 2006 7:14 pm
 
Forum: Botany Discussion
Topic: TO ANYBODY THAT HAS ANYQUESTIONS ON PHOTOSYNTHESIS
Replies: 5
Views: 11971
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