Molecular characterization of type III secretion signals via analysis of synthetic N‐terminal amino acid sequences

Summary Yersinia species utilize a type III secretion system to inject toxins, called Yops (Yersinia outer proteins), into eukaryotic cells. The N‐termini of the Yops serve as type III secretion signals, but they do not share a consensus sequence. To simplify the analysis of type III secretion signa...

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Veröffentlicht in:Molecular Microbiology 2002-01, Vol.43 (1), p.51-59
Hauptverfasser: Lloyd, Scott A., Sjöström, Michael, Andersson, Sara, Wolf‐Watz, Hans
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Sprache:eng
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Zusammenfassung:Summary Yersinia species utilize a type III secretion system to inject toxins, called Yops (Yersinia outer proteins), into eukaryotic cells. The N‐termini of the Yops serve as type III secretion signals, but they do not share a consensus sequence. To simplify the analysis of type III secretion signals, we replaced amino acids 2–8 of the secreted protein YopE with all permutations (27 or 128) of synthetic serine/isoleucine sequences. The results demonstrate that amphipathic N‐terminal sequences, containing four or five serine residues, have a much greater probability than hydrophobic or hydrophilic sequences to target YopE for secretion. Multiple linear regression analysis of the synthetic sequences was used to obtain a model for N‐terminal secretion signals. The model accurately classifies the N‐terminal sequences of native type III substrates as efficient secretion signals.
ISSN:0950-382X
1365-2958
DOI:10.1046/j.1365-2958.2002.02738.x