title: [Carbon metabolism and energetic utilization of Synechococcus sp. PCC7942 under mixotrophic condition].
abstract: To investigate the energy utilization efficiency of Synechococcus sp. PCC7942 under mixotrophic conditions, we studied its growth characteristics in mixotrophic cultures with glucose and acetic acid respectively and discussed the carbon metabolism and energy utilization based on metabolic flux analysis. Results showed that both glucose and acetate could better enhance the growth of Synechococcus sp. PCC7942, and the latter was more effective. The metabolic flux through glycolytic pathway in mixotrophic cultures was stimulated by glucose whereas depressed by acetate, while the flux through the tricarboxylic acid cycle increased in both cases. Under mixotrophic conditions, glucose makes more significant impact on the diminishment of photochemical efficiency of Synechococcus sp. PCC7942. Although the contribution of light energy was smaller, the cell yields based on total energy in mixotrophic cultures were higher comparing with photoautotrophic culture. The energy conversion efficiencies based on ATP synthesis in photoautotrophic culture, mixotrophic cultures with glucose and with acetate were evaluated to be 6.81%, 7.43% and 8.77%, respectively.
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Riming
authors.initials: R
authors.lastname: Yan
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Zhang
authors.forename: Qinggui
authors.initials: Q
authors.lastname: Zeng
authors.forename: Zhu
authors.initials: Z
authors.lastname: Du
authors.forename: Ju
authors.initials: J
authors.lastname: Chu
mesh_terms: D019342:Acetic Acid / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000096:biosynthesis; D002244:Carbon / Q000378:metabolism*; D003470:Culture Media; D046508:Culture Techniques / Q000379:methods*; D004734:Energy Metabolism; D005947:Glucose / Q000494:pharmacology; D046940:Synechococcus / Q000145:classification / Q000254:growth & development* / Q000378:metabolism
chemical_list: D003470:Culture Media; D002244:Carbon; D000255:Adenosine Triphosphate; D005947:Glucose; D019342:Acetic Acid