Identification of polar lipid precursors of the ubiquitous branched GDGT orphan lipids in a peat bog in Northern Germany
Identification of polar lipid precursors of the ubiquitous branched GDGT orphan lipids in a peat bog in Northern Germany
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DOI：
10.1016/j.orggeochem.2010.04.004
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发表时间：
2010-07-01
影响因子：
3
通讯作者：
Hinrichs, Kai-Uwe
中科院分区：
文献类型：
--
作者：
Liu, Xiao-Lei;Leider, Arne;Hinrichs, Kai-Uwe
在德国北部Bullenmoor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（GDGTs）。葡萄糖醛基和葡萄糖醛基支链GDGTs平均约占沼泽地表以下约20厘米的缺氧酸性泥炭层中微生物完整极性脂的4%，表明源微生物具有重要的生态作用。未检测到相应的磷脂。值得注意的是，糖苷支链GDGT的丰度比来自古菌的完整类异戊二烯衍生物少5-10倍，而支链GDGT核心脂质比它们的类异戊二烯类似物高出约一个数量级。这些对比关系可能反映了分枝GDGTs生产者的生物量存储量较低，以及相对于土壤古菌的较高种群增长率。寻找这些明显的孤儿脂的微生物生产者的策略应该受益于它们完整的极性前体的发现。(C) 2010 Elsevier Ltd.版权所有。
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. (C) 2010 Elsevier Ltd. All rights reserved.