Greene NP, Hinchliffe P, Crow A, Ababou A, Hughes C, Koronakis V. Structure of an atypical periplasmic adaptor from a multidrug efflux pump of the spirochete Borrelia burgdorferi.
FEBS Lett 2013;
587:2984-8. [PMID:
23851070 PMCID:
PMC3807786 DOI:
10.1016/j.febslet.2013.06.056]
[Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 06/26/2013] [Accepted: 06/28/2013] [Indexed: 11/30/2022]
Abstract
Periplasmic adaptors are essential to tripartite drug efflux pump assembly.
We present the structure of the periplasmic adaptor BesA from Borrelia burgdorferi.
BesA lacks the α-hairpin shown to underpin exit duct recruitment and pump assembly.
Recruitment of the TolC exit duct must be different in this pump.
The BesA structure has implications for proposed models of pump assembly.
Periplasmic adaptor proteins are essential components of bacterial tripartite multidrug efflux pumps. Here we report the 2.35 Å resolution crystal structure of the BesA adaptor from the spirochete Borrelia burgdorferi solved using selenomethionine derivatized protein. BesA shows the archetypal linear, flexible, multi-domain architecture evident among proteobacteria and retains the lipoyl, β-barrel and membrane-proximal domains that interact with the periplasmic domains of the inner membrane transporter. However, it lacks the α-hairpin domain shown to establish extensive coiled-coil interactions with the periplasmic entrance helices of the outer membrane-anchored TolC exit duct. This has implications for the modelling of assembled tripartite efflux pumps.
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