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The meningococcalhemA gene was cloned and used to construct a porphyrin biosynthesis mutant. An analysis of thehemA mutant indicated that meningococci can transport intact porphyrin from heme (Hm), hemoglobin (Hb), and Hb-haptoglobin (Hp). By constructing a HemA− HpuAB− double mutant, we demonstrated that HpuAB is required for the transport of porphyrin from Hb and Hb-Hp.

Transport of Intact Porphyrin by HpuAB, the Hemoglobin-Haptoglobin Utilization System ofNeisseria meningitidis