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Construction of Coordinatively Saturated Rhodium Complexes Containing Appended Peptides

Sardesai, Niranjan Y. and Lin, Susanne C. and Zimmermann, Kaspar and Barton, Jacqueline K. (1995) Construction of Coordinatively Saturated Rhodium Complexes Containing Appended Peptides. Bioconjugate Chemistry, 6 (3). pp. 302-312. ISSN 1043-1802. doi:10.1021/bc00033a011.

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Phenanthrenequinone diimine (phi) complexes of rhodium(III) bearing appended peptides have been prepared using two complementary solid phase synthetic strategies. The first method involves the direct coupling of the coordinatively saturated rhodium complex containing a pendant carboxylate to the N-terminus of a resin-bound peptide, in a manner analogous to the chain-elongation step in solid phase peptide synthesis. The second involves coupling a bidentate chelator containing the pendant carboxylate to the resin-bound peptide, followed by coordination of [Rh(phi_)2]^(3+) to the bidentate chelator attached to the peptide. Peptides of length 5-30 residues have been covalently attached to rhodium complexes in 5-18% yield using both methods. Despite the low overall yields, the regioselective modification of the peptide chain afforded by these strategies is a distinct advantage over solution phase methods. With coordination complexes which are stable to peptide deprotection and cleavage conditions from the resin, the solid phase synthetic strategies are convenient to apply. Amino acid analysis, electronic spectroscopy, and circular dichroism confirm the presence of the two components in the metal-peptide chimeras; the metal-peptide complexes exhibit the combined spectral properties of the parent metal complex and the appended peptide. Significantly, plasma desorption mass spectrometry reveals a novel pattern of peptide fragmentation for the metal-peptide chimeras that is not observed in the absence of the tethered metal complex; this fragmentation facilitates the sequence analysis of the appended peptide. Thus, metal-peptide chimeras may be conveniently prepared using solid phase methodologies, and features of coordination chemistry may be exploited for new peptide design and analysis.

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Barton, Jacqueline K.0000-0001-9883-1600
Additional Information:© 1995 American Chemical Society. Received January 31, 1995. Publication Date: May 1995. We are grateful to American Cyanamid for their financial support. We also thank Glaxo (N.Y.S.), the NIH (NRSA to S.C.L.), and the Swiss National Science Foundation (K.Z.) for fellowship support. In addition, we thank the Biopolymer Synthesis and Analysis Resource Center at Caltech for their technical assistance.
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NIH Predoctoral FellowshipUNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20160405-133522969
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Official Citation:Construction of Coordinatively Saturated Rhodium Complexes Containing Appended Peptides Niranjan Y. Sardesai, Susanne C. Lin, Kaspar Zimmermann, and Jacqueline K. Barton Bioconjugate Chemistry 1995 6 (3), 302-312 DOI: 10.1021/bc00033a011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65937
Deposited By: Ruth Sustaita
Deposited On:06 Apr 2016 18:41
Last Modified:10 Nov 2021 23:51

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