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In vitro kinetics of P sub(700) super(+) reduction of Thermosynechococcus elongatus trimeric Photosystem I complexes by recombinant cytochrome c sub(6) using a Joliot-type LED spectrophotometer
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In vitro kinetics of P sub(700) super(+) reduction of Thermosynechococcus elongatus trimeric Photosystem I complexes by recombinant cytochrome c sub(6) using a Joliot-type LED spectrophotometer
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In vitro kinetics of P sub(700) super(+) reduction of Thermosynechococcus elongatus trimeric Photosystem I complexes by recombinant cytochrome c sub(6) using a Joliot-type LED spectrophotometer
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Journal Article
In vitro kinetics of P sub(700) super(+) reduction of Thermosynechococcus elongatus trimeric Photosystem I complexes by recombinant cytochrome c sub(6) using a Joliot-type LED spectrophotometer
2017
Overview
The reduction rate of photo-oxidized Photosystem I (PSI) with various natural and artificial electron donors have been well studied by transient absorption spectroscopy. The electron transfer rate from various donors to P sub(700) super(+) has been measured for a wide range of photosynthetic organisms encompassing cyanobacteria, algae, and plants. PSI can be a limiting component due to tedious extraction and purification methods required for this membrane protein. In this report, we have determined the in vivo, intracellular cytochrome c sub(6) (cyt c sub(6))/PSI ratio in Thermosynechococcus elongatus (T.e.) using quantitative Western blot analysis. This information permitted the determination of P sub(700) super(+) reduction kinetics via recombinant cyt c sub(6) in a physiologically relevant ratio (cyt c sub(6): PSI) with a Joliot-type, LED-driven, pump-probe spectrophotometer. Dilute PSI samples were tested under varying cyt c sub(6) concentration, temperature, pH, and ionic strength, each of which shows similar trends to the reported literature utilizing much higher PSI concentrations with laser-based spectrophotometer. Our results do however indicate kinetic differences between actinic light sources (laser vs. LED), and we have attempted to resolve these effects by varying our LED light intensity and duration. The standardized configuration of this spectrophotometer will also allow a more uniform kinetic analysis of samples in different laboratories. We can conclude that our findings from the LED-based system display an added total protein concentration effect due to multiple turnover events of P sub(700) super(+) reduction by cyt c sub(6) during the longer illumination regime.
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