Abstract
Serratia marcescens ATP-binding cassette (ABC) exporter, the Lip system, secretes lipase (LipA(SM)), metalloproteases, and a cell surface layer protein homologue but not a heme acquisition protein, HasA (HasA(SM)). Secretion of HasA(SM) is limited to the Has(SM) system. However, HasA proteins from Pseudomonas fluorescens (HasA(PF)) and Pseudomonas aeruginosa were exported through the Lip and Has(SM) systems. To investigate the specificity in Lip exporter-mediated secretion, secretion analysis was performed using chimeras containing the HasA(PF) and HasA(SM) sequences. The segment Val-Ala-Leu (designated R1 to R3 sites), which is present close to the C terminus of HasA(PF) but not HasA(SM), was revealed to be involved in the substrate specificity of the Lip exporter. Introduction of amino acid substitutions into the R1-R5 region demonstrated that R1, R3, R4, and R5 sites require some specific amino acid residues for Lip-mediated secretion. The amino acid sequence of the region was conserved considerably among the proteins secreted by the Lip exporter. On the contrary, the region was not related to HasA secretion through the Has(SM) system. Interestingly, a typical C-terminal motif, so far regarded as a secretion signal, was not ...Continue Reading
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