What is RuBisCO? Where is it present in C3 and C4 plants? RuBisCO (Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase):
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Properties:
- Most abundant enzyme on Earth (~50% of leaf soluble protein)
- Molecular weight: ~540 kDa
- Structure: 8 large subunits + 8 small subunits (L₈S₈)
- Dual activity: Carboxylase (CO₂ fixation) and oxygenase (photorespiration)
Location in different plant types:
|
Plant Type |
RuBisCO Location |
Reason |
|
C3 plants |
All mesophyll chloroplasts |
Single-cell CO₂ fixation |
|
C4 plants |
Bundle sheath chloroplasts only |
Spatial separation prevents photorespiration |
|
CAM plants |
Mesophyll chloroplasts |
Temporal separation (active at night) |
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