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Illicit Transport via Dipeptide Transporter Dpp is Irrelevant to the Efficacy of Negamycin in Mouse Thigh Models of Escherichia coli Infection.

Abstract：

:Negamycin is a hydrophilic antimicrobial translation inhibitor that crosses the lipophilic inner membrane of Escherichia coli via at least two transport routes to reach its intracellular target. In a minimal salts medium, negamycin's peptidic nature allows illicit entry via a high-affinity route by hijacking the Dpp dipeptide transporter. Transport via a second, low-affinity route is energetically driven by the membrane potential, seemingly without the direct involvement of a transport protein. In mouse thigh models of E. coli infection, no evidence for Dpp-mediated transport of negamycin was found. The implication is that for the design of new negamycin-based analogs, the physicochemical properties required for cell entry via the low-affinity route need to be retained to achieve clinical success in the treatment of infectious diseases. Furthermore, clinical resistance to such analogs due to mutations affecting their ribosomal target or transport is expected to be rare and similar to that of aminoglycosides.

journal_name

ACS Infect Dis

journal_title

ACS infectious diseases

authors

McKinney DC,Bezdenejnih-Snyder N,Farrington K,Guo J,McLaughlin RE,Ruvinsky AM,Singh R,Basarab GS,Narayan S,Buurman ET

doi

10.1021/acsinfecdis.5b00027

subject

Has Abstract

pub_date

2015-05-08 00:00:00

pages

222-30

issue

5

issn

2373-8227

journal_volume

1

pub_type

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