Protein diagenesis in Patella shells: implications for amino acid racemisation dating

Ortiz Menéndez, José Eugenio and Gutiérrez-Zugasti, Igor and Torres Pérez-Hidalgo, Trinidad José and González-Morales, Manuel and Sánchez-Palencia González, Yolanda (2015). Protein diagenesis in Patella shells: implications for amino acid racemisation dating. "Quaternary Geochronology" (n. 27); pp. 105-118. ISSN 1871-1014. https://doi.org/10.1016/j.quageo.2015.02.008.

Description

Title: Protein diagenesis in Patella shells: implications for amino acid racemisation dating
Author/s:
  • Ortiz Menéndez, José Eugenio
  • Gutiérrez-Zugasti, Igor
  • Torres Pérez-Hidalgo, Trinidad José
  • González-Morales, Manuel
  • Sánchez-Palencia González, Yolanda
Item Type: Article
Título de Revista/Publicación: Quaternary Geochronology
Date: 2015
ISSN: 1871-1014
Subjects:
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Se analiza la racemización de aminoácidos en proteínas inter e intracristalinas en conchas de Patella y su utilización como herramienta geocronológica, fundamentalmente empleadas en yacimientos arqueológicos.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.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainHAR2010-22115-C02-01UnspecifiedUnspecifiedLa respuesta humana al cambio climático global en una zona litoral: el caso del tránsito al Holoceno en la costa cantábrica (10000-5000 cal BC)
Government of SpainHAR2010-22115-C02-02UnspecifiedUnspecifiedAplicación del análisis de sustancias orgánicas e inorgánicas a la reconstrucción paleoambiental, cronológica y tafonómica de yacimientos arqueológicos del Norte de España

More information

Item ID: 37736
DC Identifier: http://oa.upm.es/37736/
OAI Identifier: oai:oa.upm.es:37736
DOI: 10.1016/j.quageo.2015.02.008
Official URL: https://www.sciencedirect.com/science/article/pii/S1871101415000217?via%3Dihub
Deposited by: Memoria Investigacion
Deposited on: 14 Sep 2015 06:11
Last Modified: 03 Jun 2019 12:49
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