i AK692: A genome-scale metabolic model of Spirulina platensis C1

• Published in: BMC systems biology Vol. 6; no. 1
• Main Authors: Klanchui, Amornpan, Khannapho, Chiraphan, Phodee, Atchara, Cheevadhanarak, Supapon, Meechai, Asawin
• Format: Journal Article
• Language: English
• Published: London BioMed Central Ltd 15-06-2012; BioMed Central
• Subjects: Alternative energy sources; Dietary supplements; Feed industry; Functional foods & nutraceuticals; Genes; Genetic aspects; Genetic engineering; Genomes; Genomics; Linear programming; Metabolites; Organisms; Sensitivity analysis; Spirulina; Studies; Bangkok Thailand
• ISSN: 1752-0509; 1752-0509
• DOI: 10.1186/1752-0509-6-71

Spirulina (Arthrospira) platensis is a well-known filamentous cyanobacterium used in the production of many industrial products, including high value compounds, healthy food supplements, animal feeds, pharmaceuticals and cosmetics, for example. It has been increasingly studied around the world for scientific purposes, especially for its genome, biology, physiology, and also for the analysis of its small-scale metabolic network. However, the overall description of the metabolic and biotechnological capabilities of S. platensis requires the development of a whole cellular metabolism model. Recently, the S. platensis C1 (Arthrospira sp. PCC9438) genome sequence has become available, allowing systems-level studies of this commercial cyanobacterium. In this work, we present the genome-scale metabolic network analysis of S. platensis C1, i AK692, its topological properties, and its metabolic capabilities and functions. The network was reconstructed from the S. platensis C1 annotated genomic sequence using Pathway Tools software to generate a preliminary network. Then, manual curation was performed based on a collective knowledge base and a combination of genomic, biochemical, and physiological information. The genome-scale metabolic model consists of 692 genes, 837 metabolites, and 875 reactions. We validated i AK692 by conducting fermentation experiments and simulating the model under autotrophic, heterotrophic, and mixotrophic growth conditions using COBRA toolbox. The model predictions under these growth conditions were consistent with the experimental results. The i AK692 model was further used to predict the unique active reactions and essential genes for each growth condition. Additionally, the metabolic states of i AK692 during autotrophic and mixotrophic growths were described by phenotypic phase plane (PhPP) analysis. This study proposes the first genome-scale model of S. platensis C1, i AK692, which is a predictive metabolic platform for a global understanding of physiological behaviors and metabolic engineering. This platform could accelerate the integrative analysis of various "-omics" data, leading to strain improvement towards a diverse range of desired industrial products from Spirulina.