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The Calvin Benson Cycle01:46

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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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High-Throughput Metabolic Profiling for Model Refinements of Microalgae
11:07

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Published on: December 4, 2021

Modeling the Calvin-Benson cycle.

Jiri Jablonsky1, Hermann Bauwe, Olaf Wolkenhauer

  • 1Department of Systems Biology and Bioinformatics, University of Rostock, 18051 Rostock, Germany. jiri.jablonsky@gmail.com

BMC Systems Biology
|November 5, 2011
PubMed
Summary

Existing models of the Calvin-Benson cycle (CBC) have reproducibility issues and require significant modification. Integrating adjacent pathways like photorespiration is crucial for accurate carbon metabolism modeling, especially outside steady-state conditions.

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Area of Science:

  • Theoretical Biology
  • Metabolic Modeling
  • Systems Biology

Background:

  • The Calvin-Benson cycle (CBC) is a fundamental metabolic pathway with a history of modeling in theoretical biology.
  • Existing CBC models are often adapted, refined, and improved for studying carbon metabolism regulation.
  • Investigating adjacent metabolic pathways, such as photorespiration, is essential for comprehensive modeling.

Purpose of the Study:

  • To critically analyze existing models of the Calvin-Benson cycle for their suitability in carbon metabolism studies.
  • To investigate the integration of adjacent metabolic pathways, like photorespiration, into CBC models.
  • To assess the impact of PGA sink implementation and adjacent pathways on CBC dynamics.

Main Methods:

  • Comprehensive review and critical analysis of publicly available Calvin-Benson cycle models.
  • Investigation of PGA (phosphoglycerate) sink implementation and its regulatory impact.
  • Comparative analysis of model behavior with and without integrated adjacent metabolic pathways.

Main Results:

  • Significant issues identified in widely used CBC models, including irreproducibility and discrepancies between published descriptions and model code.
  • A weak relationship was confirmed between PGA regulation levels and PGA export efficiency.
  • Substantial changes in metabolic pool content within the CBC were observed, contrasting with PGA export efficiency.
  • Neglected minor adjacent pathways, like photorespiration, significantly impact mass production dynamics.

Conclusions:

  • Existing Calvin-Benson cycle models are unsuitable for reuse without substantial modifications.
  • The integration of adjacent metabolic pathways, particularly photorespiration, is critical for accurate modeling of carbon metabolism dynamics.
  • Photorespiration, or at least its initial step (O2 fixation), must be included in models for analyses beyond steady-state conditions.