Lipoprotein e (P4) of Haemophilus influenzae: role in heme utilization and pathogenesis |
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Authors: | Morton Daniel J Smith Ann VanWagoner Timothy M Seale Thomas W Whitby Paul W Stull Terrence L |
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Institution: | Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA. |
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Abstract: | Lipoprotein e (P4) of Haemophilus influenzae is a phosphomonoesterase, encoded by the hel gene, that has been implicated in the acquisition of heme by this fastidious organism. However, lipoprotein e (P4) is also involved in the utilization of NAD and NMN. Some reports have concluded that the reported heme-related growth defect actually reflects a growth defect for NAD. In the current study, hel insertion mutants were constructed and a role for e (P4) in heme acquisition was demonstrated independent of its role in NAD or NMN acquisition. In addition, a rat model of infection demonstrated a role for e (P4) in the pathogenesis of invasive disease. |
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