Composition of free amino acids and related compounds in invertebrates with symbiotic bacteria at hydrocarbon seeps in the Gulf of Mexico
Composition of free amino acids and related compounds in invertebrates with symbiotic bacteria at hydrocarbon seeps in the Gulf of Mexico
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DOI：
10.1007/s002270050700
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发表时间：
2000-04-01
期刊：
影响因子：
2.4
通讯作者：
Colomines, JC
中科院分区：
文献类型：
--
作者：
Pruski, AM;Fiala-Médioni, A;Colomines, JC
从墨西哥湾的碳氢化合物渗漏区采集了5种双壳类动物和2种须腕动物管虫，并对其游离氨基酸及相关化合物的组成进行了分析。与其他海洋软体动物一样，牛磺酸、甘氨酸、谷氨酸和丙氨酸在渗漏区双壳类动物中含量丰富，但与其他软体动物不同的是，亚牛磺酸和硫代牛磺酸在渗漏区物种中也含量丰富。最丰富的氨基酸化合物的相对含量表明，甘氨酸可能是双壳类动物中一种重要的渗透调节化合物，但在须腕动物中不是。在热液喷口和渗漏区双壳类动物中，都明显存在随着深度增加牛磺酸与甘氨酸的比例降低的一致模式，这归因于它们食物中牛磺酸和甘氨酸相对可获取性的差异。此外，普遍较高的谷氨酸含量以及含共生体的鳃中更高的含量，被解释为与谷氨酸在这些共生关系中作为营养传递分子的拟议作用相符。结合先前提出的关于这些化合物功能的假设，对亚牛磺酸和硫代牛磺酸在渗漏区物种中的分布进行了讨论：亚牛磺酸作为一种抗氧化剂，硫代牛磺酸作为还原硫物种的结合和运输分子。
Five species of bivalves and two species of vestimentiferan tubeworms were collected from hydrocarbon seeps in the Gulf of Mexico, and the composition of their free amino acid and related compounds analysed. Like other marine molluscs, taurine, glycine, glutamic acid. and alanine were abundant in the seep bivalves, but, unlike other molluscs, hypotaurine and thiotaurine were also abundant in the seep species. The relative levels of the most abundant amino compounds indicate that glycine is likely to be an important osmoregulatory compound in the bivalves, but not in the vestimentiferans. A consistent pattern of decreasing taurine:glycine ratio with increasing depth was evident in both vent and seep bivalves, and attributed to differences in the relative availability of taurine and glycine in their diet. Additionally, the generally high glutamate levels and higher levels in the symbiont-containing gills are interpreted as consistent with the proposed role of glutamate as a nutritive transfer molecule in these symbioses. The distribution of hypotaurine and thiotaurine in the seep species is discussed in relation to previously proposed hypotheses on the function of these compounds: hypotaurine as an antioxidant, and thiotaurine as a binding and transport molecule for reduced-sulphur species.