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A Constitutive Enzyme System for Glucose Transport by Chlorella sorokiniana
1Department of Botany and Plant Sciences, University of California, Riverside, California 92521.
Abstract:
It was found that the transport system for glucose (as measured by deoxyglucose uptake) in the high temperature strain of Chlorella (strain 07-11-05 or C. sorokiniana) was constitutive and the rate of uptake did not increase upon incubation of autotrophically grown cells with either deoxyglucose or glucose. The uptake obeyed Michaelis-Menten type kinetics with a concentration of 200 micromolar for half-saturation. The maximum rate of uptake was nearly 10 times faster per cell (at 38 C) than that reported for any other Chlorella. This rapid accumulation of deoxyglucose causes the passive efflux to become significant compared to the pump-driven influx and nonlinear uptake appears even after only 3 to 4 minutes.
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