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Protein tyrosine phosphatase 56. Simon R, Priefer U, Puhler A: A broad host range mobilization system for in vivo genetic engineering: Transposon mutagenesis in gram negative bacteria. Nat Biotech 1983,1(9):784–791.CrossRef Authors’ contributions ADG conducted out most of the laboratory work. MW and MN, working under supervision of EKJK and ADG, contributed to construction of some transcriptional fusion, mutated C. jejuni strains and translational coupling experiments. AML did RT-PCR experiments for the dba-dsbI operon as well as expression of dsbI from its own promoter, and was involved in drafting the manuscript. RG performed experiments concerning influence of iron concentration on cjaA gene expression and AstA activity level. PR performed EMSA assays. AW performed experiments concerning DsbI glycosylation. EKJK conceived the study.