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Identification of polar lipid precursors of the ubiquitous branched GDGT orphan lipids in a peat bog in Northern Germany

机译:鉴定德国北部泥炭沼泽中普遍存在的分支GDGT孤脂的极性脂质前体

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摘要

Two types of intact branched glycerol dialkyl glycerol tetraethers (GDGTs) were detected in peat bog samples from Bullenmoor, Northern Germany. Glucuronosyl and glucosyl branched GDGTs comprise on average ca. 4% of the microbial intact polar lipids in the anoxic, acidic peat layer ca. 20. cm below the surface of the bog, suggesting an important ecological role for the source microorganisms. No corresponding phospholipids were detected. Notably, glycosidic branched GDGTs are 5-10 times less abundant than their intact isoprenoid counterparts derived from Archaea, while branched GDGT core lipids exceed their isoprenoid analogues by about an order of magnitude. These contrasting relationships may reflect lower standing stocks of the biomass of producers of branched GDGTs, combined with higher population growth rates relative to soil Archaea. Search strategies for the microbial producers of these conspicuous orphan lipids should benefit from the discovery of their intact polar precursors.
机译:在德国北部布伦穆尔的泥炭沼泽样品中检测到两种类型的完整支链甘油二烷基甘油四醚(GDGT)。葡糖醛酸糖基和葡糖基支化的GDGT平均约占。缺氧,酸性泥炭层中约4%的微生物完整极性脂质。在沼泽表面以下20厘米处,表明源微生物具有重要的生态作用。没有检测到相应的磷脂。值得注意的是,糖苷支化的GDGT比其完整的类古细菌类异戊二烯对应物少5-10倍,而支化的GDGT核心脂质超出其类异戊二烯类似物约一个数量级。这些相反的关系可能反映了支链GDGT生产者生物量的较低存量,以及相对于土壤古生菌而言较高的种群增长率。这些明显的孤儿脂质的微生物生产者的搜索策略应受益于其完整极性前体的发现。

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