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Antistaphylococcal activity of DNA-interactive pyrrolobenzodiazepine (PBD) dimers and PBD-biaryl conjugates

Rahman, Khondakar M., Rosado, Helena, Moreira, Joao B., Feuerbaum, Eva-Anne, Fox, Keith R., Stecher, Eva, Howard, Philip W., Gregson, Stephen J., James, Colin H., de la Fuente, Maria, Waldron, Denise E., Thurston, David E. and Taylor, Peter W. (2012) Antistaphylococcal activity of DNA-interactive pyrrolobenzodiazepine (PBD) dimers and PBD-biaryl conjugates Journal of Antimicrobial Chemotherapy, 67, (7), pp. 1683-1696. (doi:10.1093/jac/dks127).

Record type: Article


Objectives: pyrrolobenzodiazepine (PBD) dimers, tethered through inert propyldioxy or pentyldioxy linkers, possess potent bactericidal activity against a range of Gram-positive bacteria by virtue of their capacity to cross-link duplex DNA in sequence-selective fashion. Here we attempt to improve the antibacterial activity and cytotoxicity profile of PBD-containing conjugates by extension of dimer linkers and replacement of one PBD unit with phenyl-substituted or benzo-fused heterocycles that facilitate non-covalent interactions with duplex DNA.

Methods: DNase I footprinting was used to identify high-affinity DNA binding sites. A staphylococcal gene microarray was used to assess epidemic methicillin-resistant Staphylococcus aureus 16 phenotypes induced by PBD conjugates. Molecular dynamics simulations were employed to investigate the accommodation of compounds within the DNA helix.

Results: increasing the length of the linker in PBD dimers led to a progressive reduction in antibacterial activity, but not in their cytotoxic capacity. Complex patterns of DNA binding were noted for extended PBD dimers. Modelling of DNA strand cross-linking by PBD dimers indicated distortion of the helix. A majority (26 of 43) of PBD-biaryl conjugates possessed potent antibacterial activity with little or no helical distortion and a more favourable cytotoxicity profile. Bactericidal activity of PBD-biaryl conjugates was determined by inability to excise covalently bound drug molecules from bacterial duplex DNA.

Conclusions: PBD-biaryl conjugates have a superior antibacterial profile compared with PBD dimers such as ELB-21. We have identified six PBD-biaryl conjugates as potential drug development candidates

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Published date: April 2012
Organisations: Molecular and Cellular


Local EPrints ID: 345238
ISSN: 0305-7453
PURE UUID: 600c503c-3305-424d-9fa4-06a972ceda98
ORCID for Keith R. Fox: ORCID iD

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Date deposited: 14 Nov 2012 13:45
Last modified: 18 Jul 2017 05:11

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Author: Khondakar M. Rahman
Author: Helena Rosado
Author: Joao B. Moreira
Author: Eva-Anne Feuerbaum
Author: Keith R. Fox ORCID iD
Author: Eva Stecher
Author: Philip W. Howard
Author: Stephen J. Gregson
Author: Colin H. James
Author: Maria de la Fuente
Author: Denise E. Waldron
Author: David E. Thurston
Author: Peter W. Taylor

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