DipA, a pore-forming protein in the outer membrane of Lyme disease spirochetes exhibits specificity for the permeation of dicarboxylates

Authors two and three contributed equally to the paper
Lyme disease Borrelia are highly dependent on the uptake of nutrients provided by their hosts. Our study describes the identification of a 36 kDa protein that functions as putative dicarboxylate-specific porin in the outer membrane of Lyme disease Borrelia. The protein was purified by hydroxyapatite chromatography and designated as DipA, for dicarboxylate-specific porin A. DipA was partially sequenced, and corresponding genes were identified in the genomes of B. burgdorferi B31, Borrelia garinii PBi and Borrelia afzelii PKo. DipA exhibits high homology to the Oms38 porins of relapsing fever Borrelia. B. burgdorferi DipA was characterized using the black lipid bilayer assay. The protein has a single-channel conductance of 50 pS in 1 M KCl, is slightly selective for anions with a permeability ratio for cations over anions of 0.57 in KCl and is not voltage-dependent. The channel could be partly blocked by different di- and tricarboxylic anions. Particular high stability constants up to about 28,000 l/mol (in 0.1 M KCl) were obtained among the 11 tested anions for oxaloacetate, 2‑oxoglutarate and citrate. The results imply that DipA forms a porin specific for dicarboxylates which may play an important role for the uptake of specific nutrients in different Borrelia species.

Bonde, MariUmeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten)(Swepub:umu)maiboe01 (författare)
Bunikis, Ignas,1981-Umeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten)(Swepub:umu)igbu0001 (författare)
Denker, KatrinUniversity of Würzburg (författare)
Sickmann, AlbertUniversity of Würzburg (författare)
Bergström, SvenUmeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten)(Swepub:umu)svbe0001 (författare)
Benz, RolandUniversity of Würzburg (författare)
University of WürzburgInstitutionen för molekylärbiologi (Medicinska fakulteten) (creator_code:org_t)

Av författaren/redakt...: Marcus, Thein; Bonde, Mari; Bunikis, Ignas, ...; Denker, Katrin; Sickmann, Albert; Bergström, Sven; visa fler...; Benz, Roland; visa färre...

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