Isolation and identification of alpha,alpha-trehalose and glycerol from an arctic psychrotolerant Streptomyces sp. SB9 and their possible role in the strain's survival.
ABSTRACT Streptomyces sp. strain SB9 was isolated from perm frost soil samples in Spitsbergen, Arctic Ocean; it grows in a temperature range between 4 degrees C and 28 degrees C. During the survey of biologically active metabolites biosynthesized by this strain, significant amounts of alpha,alpha-trehalose (1) and glycerol (2) were detected. The compounds were isolated from the mycelium, were chromatographically separated, and the structures were elucidated on the basis of MS and NMR measurements. A possible role of trehalose in cold adaptation of the strain was examined. It was determined that the mycelium of the strain cultivated at 4 degrees C accumulated 5-fold higher amounts of trehalose in comparison with the cells cultivated at 28 degrees C. The mesofilic reference strains, Streptomyces spectabilis NRRL 2494 and Streptomyces lividans TK64, accumulated 100-fold less trahalose than the psychrotolerant Streptomyces sp. SB9. High amounts of trehalose in the cells could be a reason for adaptation of the strain to life at Arctic conditions.