Extraterrestrial nucleobases in the Murchison meteorite
Extraterrestrial nucleobases in the Murchison meteorite
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DOI：
10.1016/j.epsl.2008.03.026
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发表时间：
2008-06-15
影响因子：
5.3
通讯作者：
Ehrenfreund, Pascale
中科院分区：
文献类型：
--
作者：
Martins, Zita;Botta, Oliver;Ehrenfreund, Pascale
富含碳的陨石，碳质陨石，含有许多生物相关的有机分子，并将生命前物质传递给年轻的地球。我们目前化合物的碳同位素数据表明，测量嘌呤和嘧啶化合物的默奇森陨石的土著组成部分。尿嘧啶和黄嘌呤的δ C-13的碳同位素比率分别为+44.5 ‰和+37.7 ‰，表明这些化合物的非陆地来源。这些新结果表明，有机化合物是现代生物化学中遗传密码的组成部分，在早期太阳系中已经存在，并可能在生命起源中发挥了关键作用。(C)2008 Elsevier B. V.保留所有权利。
Carbon-rich meteorites, carbonaceous chondrites, contain many biologically relevant organic molecules and delivered prebiotic material to the young Earth. We present compound-specific carbon isotope data indicating that measured purine and pyrimidine compounds are indigenous components of the Murchison meteorite. Carbon isotope ratios for uracil and xanthine of delta C-13 = +44.5 parts per thousand and +37.7 parts per thousand, respectively, indicate a non-terrestrial origin for these compounds. These new results demonstrate that organic compounds, which are components of the genetic code in modern biochemistry, were already present in the early solar system and may have played a key role in life's origin. (C) 2008 Elsevier B.V. All rights reserved.