Probing the organic-mineral interface at the molecular level in model biominerals

Rebecca A. Metzler, Il Won Kim, Katya Delak, John S. Evans, Dong Zhou, Elia Beniash, Fred Wilt, Christopher E. Killian, Mike Abrecht, Jau Wern Chiou, Jinghua Guo, Susan N. Coppersmith, P. U.P.A. Gilbert

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Many proteins from the nacre and prismatic layers of mollusk shells have been identified and sequenced, yet the mutual molecular interactions, organization, and rearrangements that occur when proteins interact with calcium carbonate minerals during biomineralization are unknown. Examining the organic-mineral interface (OMI) is central to understanding these processes further. We prepared model biomineral systems, consisting of calcium carbonate crystals grown in the presence of model biomineral peptides (AP7N, AP24N, n16N) and a protein (LSM34) and used X-ray absorption near edge structure (XANES) spectromicroscopy to probe the electronic structure of both the calcium carbonate crystals and the peptides, to detect changing bonds at the OMI in crystals grown in the presence of peptides. All model biomineral systems gave similar results: disruption of CO bonds in calcite and enhancement of the peaks associated with C-H bonds in peptides. We also show that the observed changes do not occur when Asp and Glu are replaced in the n16N sequence with Asn and Gln, respectively, indicating that carboxyl groups in Asp and Glu are important to the organic-mineral interaction at the molecular level [1].

Original languageEnglish (US)
Title of host publicationBiomineral Interfaces - From Experiment to Theory
Pages1-6
Number of pages6
StatePublished - 2008
Event2008 MRS Fall Meeting - Boston, MA, United States
Duration: Dec 1 2008Dec 5 2008

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1131
ISSN (Print)0272-9172

Other

Other2008 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period12/1/0812/5/08

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Metzler, R. A., Kim, I. W., Delak, K., Evans, J. S., Zhou, D., Beniash, E., Wilt, F., Killian, C. E., Abrecht, M., Chiou, J. W., Guo, J., Coppersmith, S. N., & Gilbert, P. U. P. A. (2008). Probing the organic-mineral interface at the molecular level in model biominerals. In Biomineral Interfaces - From Experiment to Theory (pp. 1-6). (Materials Research Society Symposium Proceedings; Vol. 1131).