Response of cyanobacterial carbon concentrating system to light intensity: a simulated analysis

摘要: Cyanobacteria possess a delicate system known as the carbon concentrating mechanism (CCM), which can efficiently elevate intracellular inorganic (Ci) concentration via active transportation. The requires energy supplied by photosystems; therefore, activity of Ci transporter is closely related to light intensity. However, relationship between CCM and intensity has rarely been evaluated. Here, we present an improved quantitative model in incorporated, developed that modified after Fridlyand et a1. 1996. Some equations used this were inducted describe transport capacity intensity, response change simulated. Our results indicate efficiency sensitive When external was low, CO2 uptake dominated total with increasing while under high concentrations HCO3− primarily contributed uptake. Variations ratio allocated systems could markedly affect operation CCM. Indeed, our simulations suggest various combinations fluxes provide possible approach detect way cell distributes produced photosystems two processes. proportion consumed on expenditure for fixation one molecule determined at 18%–40%.