Characterisation of glucose transport in the hyperthermophilic Archaeon Sulfolobus solfataricus.
Sulfolobus solfiataricus is a hyperthermophilic Archaeon growing at 80 degrees C, pH 3. The glucose transport system of this organism has been characterised kinetically at this temperature and pH using 2-deoxy-D-glucose: the sugar analogue is transported into the cells with a Km = 1.8 +/- 0.3 microM and a Vmax = 3.6 +/- 0.1 nmol min(-1) (mg protein)(-1), with an intracellular accumulation of up to 200-fold over the extracellular concentration. Transport was significantly reduced at pH 5. Inhibition of 2-deoxy-D-glucose transport was investigated using a variety of sugars and sugar analogues; D-glucose, D-galactose and D-mannose showed the highest affinity for the transporter, with D-glucose possessing a Ki = 120 +/- 20 nM.
Cusdin
F S
FS
School of Biology and Biochemistry, University of Bath, UK.
Robinson
M J
MJ
Holman
G D
GD
Hough
D W
DW
Danson
M J
MJ
D001692:Biological Transport; D003847:Deoxyglucose / Q000378:metabolism*; D007700:Kinetics; D016944:Sulfolobus / Q000378:metabolism*
D003847:Deoxyglucose