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Targeting a ruthenium complex to the nucleus with short peptides

Puckett, Cindy A. and Barton, Jacqueline K. (2010) Targeting a ruthenium complex to the nucleus with short peptides. Bioorganic and Medicinal Chemistry Letters, 18 (10). pp. 3564-3569. ISSN 0960-894X. PMCID PMC2873839. doi:10.1016/j.bmc.2010.03.081.

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In an effort to develop octahedral metal complexes as chemotherapeutic and diagnostic agents targeted to DNA, it is critical to optimize the properties of their cellular uptake. Appending d-octaarginine has been found to improve both the uptake and nuclear localization efficiency of these complexes, but the increased positive charge interferes with selective DNA binding and hence activity. Herein, we evaluate the nuclear entry of a series of luminescent ruthenium peptide conjugates of shorter sequence and lower charge. As is the case for the d-octaarginine conjugate (Ru-D-R8), the tetrapeptide RrRK (where r = d-arginine) facilitates nuclear localization of the ruthenium complex above a threshold concentration, though the threshold is higher for this conjugate (Ru–RrRK) than for Ru-D-R8. Furthermore, appended fluorescein, which lowers the threshold concentration for Ru-D-R8, does not improve nuclear entry of Ru–RrRK, indicating that fluorescein conjugation is not a general strategy for modulating the distribution of cell-penetrating peptides. Similarly, the concentration required for nuclear entry of Ru–RrRK is much higher than has been reported for a thiazole orange RrRK conjugate, demonstrating the influence of payload on the efficiency of uptake and localization of cell-penetrating peptides.

Item Type:Article
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URLURL TypeDescription CentralArticle
Barton, Jacqueline K.0000-0001-9883-1600
Additional Information:© 2010 Elsevier. Received 9 February 2010; revised 18 March 2010; accepted 23 March 2010. Available online 8 April 2010. We are grateful to the National Institutes of Health (GM33309) for their financial support. We also acknowledge the Caltech Biological Imaging Center and the Caltech Flow Cytometry Facility for their expert assistance and facilities.
Funding AgencyGrant Number
Subject Keywords:Ruthenium complex; Metal-DNA interaction; Peptide conjugate; Cellular uptake; Nuclear targeting
Issue or Number:10
PubMed Central ID:PMC2873839
Record Number:CaltechAUTHORS:20100602-153002681
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Official Citation:Cindy A. Puckett, Jacqueline K. Barton, Targeting a ruthenium complex to the nucleus with short peptides, Bioorganic & Medicinal Chemistry, Volume 18, Issue 10, 15 May 2010, Pages 3564-3569, ISSN 0968-0896, DOI: 10.1016/j.bmc.2010.03.081.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18535
Deposited By: Tony Diaz
Deposited On:13 Jun 2010 04:47
Last Modified:08 Nov 2021 23:44

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