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conjugal transfer protein TraF
TraF protein undergoes proteolytic processing associated with export. The 19 amino acids at the amino terminus of the polypeptides appear to constitute a typical membrane leader peptide - not included in this family, while the remainder of the molecule is predicted to be primarily hydrophilic in character [1]. F plasmid TraF and TraH are required for F pilus assembly and F plasmid transfer, and they are both localised to the outer membrane in the presence of the complete F transfer region, especially TraV, the putative anchor [2]. [1]. 3042757. The product of the F plasmid transfer operon gene, traF, is a periplasmic protein. Wu JH, Kathir P, Ippen-Ihler K;. J Bacteriol. 1988;170:3633-3639. [2]. 20081027. F plasmid TraF and TraH are components of an outer membrane complex involved in conjugation. Arutyunov D, Arenson B, Manchak J, Frost LS;. J Bacteriol. 2010;192:1730-1734. (from Pfam)
TlpA family protein disulfide reductase
TlpA family protein disulfide reductase such as Bradyrhizobium japonicum thiol:disulfide interchange protein TlpA, an unusual thioredoxin which has been implicated in the biogenesis of cytochrome aa3 and also characterized as a reductant for the copper metallochaperone ScoI, and similar to ResA and DsbE, which are essential proteins in cytochrome c maturation
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