Site-specific modification of α-helical peptides with electron donors and acceptors
Abstract
We have prepared a histidine containing monomeric α-helical peptide, ETH6 (A_2KA_4KA_2HA_6HA_4KA_4K) in order to study long-range electron transfer (ET). This peptide was site-specifically labelled with a ruthenium (donor) at one histidine and a second ruthenium (acceptor) at a second histidine located on the same peptide. Both the unlabeled peptide and the singly labeled peptide-metal complex, Ru(bpy)_2(im)(His)-ETH6, were shown to form stable monomeric α-helical structures as determined by circular dichroism. Ru(NH_3)_4(py) was coupled to Ru(bpy_2)(im)(His)-ETH6, forming a Ru(bpy)_2(im)(His)-ETH6-(His)Ru(NH_3)_4(py) donor-acceptor complex. The synthesis and characterization of these peptides provide an entry into a series of molecules that are ideally suited to evaluate pathway differences such as H-bond mediated versus backbone-coupled long-range ET in protein α-helices.
Additional Information
© 1996 Elsevier Science S.A. Available online 15 January 1999. We thank H. Qian for the computer program implementing Lifson-Roig theory, O. Hathaway for mass spectral analysis and J.P. Kayyem for helpful discussions. SLM. acknowledges support from the Rita Allen Foundation, the David and Lucile Packard Foundation and the Searle Scholars Program. B.I.D. is partially supported by NIH Training Grant GM 08346. T.J.M. acknowledges support from the Petroleum Research Fund, American Chemical Society and the Research Corporation.Additional details
Identifiers
- Eprint ID
- 24103
- Resolver ID
- CaltechAUTHORS:20110620-160429999
Funding
- Rita Allen Foundation
- David and Lucile Packard Foundation
- Searle Scholars Program
- NIH Training Grant Fellowship
- GM 08346
- American Chemical Society Petroleum Research Fund
- Research Corporation
Dates
- Created
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2011-09-28Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field