Aspartic acid racemization and protein diagenesis in corals over the last 350 years

Details Aspartic acid racemization and protein diagenesis in corals over the last 350 years Aspartic acid racemization and protein diagenesis in corals over the last 350 years

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3847g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 10, pp.3847-3850

Computer Science

4

Scientific paper

D/L aspartic acid values from a 350-year time series of annual growth bands of a living colony of the coral Porites australiensis show a very regular pattern of increase with age. The initial rate of racemization is extraordinarily rapid (0.6% per year) but slows in older growth bands to 0.04% per year (4% per century). The skeletal proteins show progressive hydrolysis with increasing age, with free aspartic acid comprising 16% of the total aspartic acid in the 350-year-old band. The proteins are unusually rich in aspartic acid (nearly 50 mol%). The relative weakness of the peptide bonds formed by aspartic acid moieties is probably responsible for the rapid hydrolysis and consequent rapid racemization of aspartic acid. Racemization analysis provides a means for checking for sections of missing bands in corals and for screening of prospective samples for U-Th dating.

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