Transport properties of two extremely thermophilic species of Thermus.
Thermus flavus and T. ruber grew optimally at 75 and 60 degrees C, respectively, but transport of monosaccharides (D-quinovose) and amino acids (2-aminoisobutyric acid) had optima about 20 degree C lower. Both transports were active, inhibited by 2,4-dinitrophenol but hardly at all by uranyl(2+) ions. Several transport systems are apparently involved with each class of compounds. Preincubation with glucose curtailed subsequent transport severely. Practical cessation of transport below 35 degrees C may be associated with the rather uniform composition of membrane lipids where iso- and anteiso-C15 and C17 acids are practically the only components.
D000596:Amino Acids / Q000378:metabolism*; D000621:Aminoisobutyric Acids / Q000378:metabolism; D001693:Biological Transport, Active; D003847:Deoxyglucose / Q000378:metabolism; D004140:Dinitrophenols / Q000494:pharmacology; D006358:Hot Temperature; D009005:Monosaccharides / Q000378:metabolism*; D013045:Species Specificity; D013824:Thermus / Q000254:growth & development / Q000378:metabolism*; D014871:Water Microbiology
D000596:Amino Acids; D000621:Aminoisobutyric Acids; D004140:Dinitrophenols; D009005:Monosaccharides; D003847:Deoxyglucose