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首页> 外文期刊>Quaternary geochronology >Protein diagenesis in Patella shells: Implications for amino acid racemisation dating
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Protein diagenesis in Patella shells: Implications for amino acid racemisation dating

机译：ella骨壳中的蛋白质成岩作用：对氨基酸外消旋化的影响

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摘要

The inter- and intra-crystalline fractions of Patella vulgata limpets recovered from archaeological sites in Northern Spain (covering Neolithic, Mesolithic, Magdalenian, Solutrean, and Aurignacian periods) were examined for amino acid composition and racemisation over time. The calcitic apex and rim areas of the shells were found to probably be composed of similar proteins, as the D/L values and amino acids were comparable and varied in the same way with increasing age; however, the mineral structures present in these areas differed. The aragonitic intermediate part of the shell showed a distinctly different amino acid composition and mineral structure. The main protein leaching from the inter-crystalline fraction occurred within the first 6000 yr after the death of the organism. In contrast, the intra-crystalline fraction comprised of a different protein composition than the inter-crystalline fraction appeared to behave as a closed system for at least 34 ka, as reflected by the lack of a significant decrease in the amino acid content; however, changes in the amino acid percentages occurred during this period. The concentration of aspartic acid remained almost constant with age both in inter- and intra-crystalline proteins, and its contribution to the total amino acid content increased with age at the expense of other amino acids such as glutamic acid, serine, glycine and alanine. Temperature is thought to play a key role in the amino acid racemisation of P. vulgata and could explain why in the localities belonging to the Gravettian and Solutrean period, which formed during relatively cold conditions, D/L values were similar to those detected in shells from sites formed during the Magdalenian. (C) 2015 Elsevier B.V. All rights reserved.
机译：从西班牙北部（覆盖新石器时代，中石器时代，马格达林时代，Solutrean和Aurignacian时期）的考古遗址中回收的Pat骨帽贝的晶间和晶内级分随时间推移进行了氨基酸组成和消旋处理。发现贝壳的钙质顶点和边缘区域可能由相似的蛋白质组成，因为D / L值和氨基酸是可比的，并且随着年龄的增长以相同的方式变化。但是，这些地区的矿物结构不同。壳的文石中间部分显示出明显不同的氨基酸组成和矿物质结构。从晶间部分浸出的主要蛋白质发生在生物死亡后的第一个6000年内。相反，由晶体间组分组成的蛋白质组成与晶体间组分不同的晶体内组分在至少34 ka时表现为封闭系统，这反映出氨基酸含量没有明显降低。但是，在此期间氨基酸百分比发生了变化。天冬氨酸的浓度在晶体间和晶体内蛋白质中都随着年龄的增长而几乎保持恒定，并且其对总氨基酸含量的贡献随着年龄的增长而增加，而谷氨酸，丝氨酸，甘氨酸和丙氨酸等其他氨基酸的消耗却增加了。人们认为温度在寻常小球藻的氨基酸外消旋中起关键作用，并且可以解释为什么在相对寒冷的条件下形成的属于Gravettian和Solutrean时期的地方，D / L值类似于在壳中检测到的值。来自马格达莱尼亚时期形成的地点。 （C）2015 Elsevier B.V.保留所有权利。

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