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KMID : 0545120150250101629
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Journal of Microbiology and Biotechnology
2015 Volume.25 No. 10 p.1629 ~ p.1633
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Roles of the Peptide Transport Systems and Aminopeptidase PepA in Peptide Assimilation by Helicobacter pylori
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Ki Mi-Ran
Lee Ji-Hyun
Yun Soon-Kyu
Choi Kyung-Min
Hwang Se-Young
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Abstract
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Peptide assimilation in Helicobacter pylori necessitates a coordinated working of the peptide transport systems (PepTs) and aminopeptidase (PepA). We found that H. pylori hydrolyzes two detector peptides, L-phenylalanyl-L-3-thiaphenylalanine (PSP) and L-phenylalanyl-L-2- sulfanilylglycine (PSG), primarily before intake and excludes their antibacterial effects, whereas Escherichia coli readily transports them with resultant growth inhibition. PSP assimilation by H. pylori was inhibited by aminopeptidase inhibitor bestatin, but not by dialanine or cyanide-m-chlorophenylhydrazone, contrary to that of E. coli. RT- and qRT-PCR analyses showed that H. pylori may express first the PepTs (e.g., DppA and DppB) and then PepA. In addition, western blot analysis of PepA suggested that the bacterium secretes PepA in response to specific inducers.
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KEYWORD
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Helicobacter pylori, peptide transport, PepTs, PepA, detector peptides
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