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Enantiomeric interactions between nucleic acid bases and amino acids on solid surfaces
Molecular interaction between nucleic acid bases and amino acids is a fundamental process in biology. The adsorption of the molecules on surfaces provides the opportunity to study such interactions in great detail by exploiting the high-resolution imaging capabilities of scanning tunnelling microscopy (STM). The chemisorption of prochiral molecules, such as adenine, on a metal surface causes the adsorbed species to become chiral1. Subsequent interactions with inherently chiral molecules may then lead to the formation of diastereoisomers, if the enantiomeric interaction process is sufficiently strong. In the case of adenine adsorption on Cu{110}, the chiral adsorbates form homochiral chains. Here, we show that the adenine chain direction is fully correlated with the chirality, and that the a-amino acid, phenylglycine, shows a strong chiral preference in its interaction with these chains. STM images clearly demonstrate that S-phenylglycine (R-phenylglycine) binds only to chains rotated 19.5° (anti-) clockwise from the [001] direction. Closer examination reveals that the enantiomeric interaction involves double rows of phenylglycine molecules and the adenine chains. This is the first observation at the molecular level of diastereoisomeric interaction, and demonstrates that STM is a powerful method for studying the details of these interactions.
History
Publication status
- Published
Journal
Nature MaterialsISSN
1476-1122Publisher
Nature Publishing GroupExternal DOI
Issue
5Volume
2Page range
324-328Pages
6.0Department affiliated with
- Chemistry Publications
Notes
First demonstration of diastereoisomeric recognition between adsorbed nucleic acid bases and chiral amino acids through hydrogen bonding and substrate mediated electrostatic interactions using high resolution STM images show the chiral recognition of R(S)-phenylglycine with adsorbed adenine molecular chains. QC conducted the experimental work and is corresponding author, cited 45 times.Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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