期刊
EXTREMOPHILES
卷 8, 期 1, 页码 13-21出版社
SPRINGER JAPAN KK
DOI: 10.1007/s00792-003-0351-6
关键词
archaeal membranes; barophiles; isoprenoids; mass transfer coefficients; methanogens; thermophiles
A series of five progressively saturated C-35 isoprenoids has been identified in cell-free extracts of the deep-sea methanogen Methanococcus jannaschii. Production and relative abundance of the isoprenoids were dependent on culture conditions; significant production occurred in a 16-l fermentor (12-l working volume) and a 2.5-l fermentor (2-l working volume) but could not be duplicated in serum bottles. Several factors were investigated and shown not to account for the different production levels, including medium composition, pH, and temperature. However, the interphase mass transfer rate was shown to significantly affect the production of C-35 isoprenoids in a fermentor. The structures of the novel isoprenoids were confirmed by hydrogenation reactions and mass spectra of the isoprenoids. Indirect evidence based on genomics and mass spectrometry data implicates head-to-head condensation of farnesyl pyrophosphate (C-15) with geranylgeranyl pyrophosphate (C-20) as the mechanism for C-35 synthesis.
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