The growth-temperature range of the actinomycete, Thermomonospora curvata, was influenced by the nature of the soluble carbon sources used, which were derived from cellulose, pectin, starch and xylan. This thermophile had the broadest (38 to 65°C) and narrowest (42 to 59°C) temperature range during growth on cellobiose (from cellulose) and 4-deoxy-LXXX-threo-t-hexoseulose uronic acid (from pectin), respectively. This substrate-temperature interaction was accompanied by changes in cellular fatty acids: uronic-acid-grown cells had relatively low amounts of branched chain fatty acids (particularly iso-16:0) and high amounts of monounsaturated fatty acids (particularly cis-18:1) compared with cells grown on any other substrate. Moreover, uronic-acid-grown cells could not respond to increased growth temperature by altering the ratio of branched chain fatty acids to straight chain fatty acids.
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