1887

Abstract

Several strains of extremely halophilic archaeobacteria, both non-alkaliphilic and alkaliphilic, including and species, were isolated from salt locales in India. The major phospholipids in these strains were the C-C-glycerol diether analogues of phosphatidylglycerolmethylphosphate (PGP-Me), phosphatidylglycerol (PG) and phosphatidic acid (PA). In addition, the strains possessed the characteristic glycolipids, sulfated triglycosyl and tetraglycosyl diethers (S-TGD-1 and S-TeGD, respectively) and the unsulfated triglycosyl diether (TGD-1); and the strains had the characteristic sulfated and unsulfated diglycosyl glycerol diethers (S-DGD-1 and DGD-1, respectively). The PGP-Me, and PG components of the haloalkaliphiles each occurred as two molecular species with C-C- and C-C- (isopranoid) glycerol diether lipid cores. In contrast to previous reports of the absence of glycolipids in natronobacteria, the strains from India were found to contain small amounts of a novel glycolipid identified as glucopyranosyl-1 → 6-glucopyranosyl-1 →1-glycerol diether (DGD-4). The lipid cores of DGD-4 also contained mainly unhydroxylated or hydroxylated C-C, C-C and C-C molecular species with unsaturated (isoprenoid) chains. Hydroxylated lipid cores have previously been identified only in some methanogenic archaeobacteria.

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1994-08-01
2021-07-28
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