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  • Title: Ferrochelatase activity and protoporphyrin IX utilization in Haemophilus influenzae.
    Author: Loeb MR.
    Journal: J Bacteriol; 1995 Jun; 177(12):3613-5. PubMed ID: 7768877.
    Abstract:
    Previous research showed that the heme-requiring human pathogen Haemophilus influenzae lacks the first six of the seven enzymes required for heme synthesis, starting with the precursor, 5-amino levulinic acid. In this study, I demonstrated either directly or by reasonable inference that all 57 strains of H. influenzae examined, including 2 unable to grow on protoporphyrin IX, possess ferrochelatase, which catalyzes heme formation by insertion of Fe2+ into the protoporphyrin IX nucleus and which is the last enzyme in the heme synthetic pathway. Further, I showed that this enzyme can also function in the reverse direction, releasing Fe2+ from heme.
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