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1. EspC, an autotransporter protein secreted by enteropathogenic Escherichia coli (EPEC), displays protease activity on human hemoglobin.

Author

Drago-Serrano ME, Parra SG, and Manjarrez-Hernández HA

Subjects
Carrier Proteins blood, Carrier Proteins metabolism, Escherichia coli Proteins isolation & purification, Heme-Binding Proteins, Hemeproteins metabolism, Hemin metabolism, Humans, Serine Endopeptidases metabolism, Escherichia coli enzymology, Escherichia coli Proteins metabolism, Hemoglobins metabolism, Serine Endopeptidases blood
Abstract

Some enteropathogenic Escherichia coli (EPEC) strains, which are an important cause of diarrhea among infants, secrete a serine protease autotransporter protein called EspC. The pathogenic role of EspC upon EPEC infection is unknown. In this study, we demonstrated that purified EspC protein, obtained from supernatants of EPEC cultures, interacted with hemoglobin and degraded it. Moreover, we have shown that EspC is a hemin-binding protein. We hypothesized that hemoglobin proteolysis by EspC may contribute to the utilization of heme and hemoglobin iron for bacterial growth.

Published
2006
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