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- W2038898103 abstract "Autotransporters (ATs) are large virulence factors secreted by Gram-negative bacteria. The passenger domain, carrying the virulence functions, is transported across the bacterial outer membrane in a step that is facilitated by a C-terminal β-domain. This domain folds into a β-barrel with a central aqueous pore of ∼ 1 nm inner diameter according to crystal structures. However, these static dimensions are not compatible with the observed secretion of passengers that may contain natural short-spaced disulfide bonds or artificially fused folded elements. Here, we have systematically analyzed the dimensions of the active AT passenger translocator by inserting peptides of different length and structural complexity in the passenger of the AT hemoglobin protease. The peptides were introduced in a short loop protruding from the main structure and flanked by two single cysteines. Our results show that the attained secondary structure may be more critical for secretion than the length of peptide inserted. Furthermore, the data suggest that, during passenger translocation, at least four extended polypeptides or an extended polypeptide and an α-helix are accommodated in the translocator, indicating that the diameter of the active translocation pore is up to 1.7 nm. If the β-domain functions as the translocator, it must be forced into an expanded conformation during passenger translocation." @default.
- W2038898103 created "2016-06-24" @default.
- W2038898103 creator A5007699425 @default.
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- W2038898103 creator A5053483961 @default.
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- W2038898103 date "2012-02-01" @default.
- W2038898103 modified "2023-09-28" @default.
- W2038898103 title "Estimating the Size of the Active Translocation Pore of an Autotransporter" @default.
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- W2038898103 doi "https://doi.org/10.1016/j.jmb.2011.12.047" @default.
- W2038898103 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22227392" @default.
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