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Infect. Immun., Dec 1996, 5008-5014, Vol 64, No. 12
Copyright © 1996, American Society for Microbiology

Identification and purification of a hemoglobin-binding outer membrane protein from Neisseria gonorrhoeae

CJ Chen, PF Sparling, LA Lewis, DW Dyer and C Elkins
Department of Medicine, School of Medicine, University of North Carolina, Chapel Hill 27599, USA.

The majority of in vitro-grown Neisseria gonorrhoeae strains were unable to use hemoglobin as the sole source of iron for growth (Hgb-), but a minor population was able to do so (Hgb+). The ability of Hgb+ gonococci to utilize hemoglobin as the iron source was associated with the expression of an iron-repressible 89-kDa hemoglobin-binding protein in the outer membrane. The N-terminal amino acid sequence of this protein revealed amino acids, from positions 2 to 16, identical to those of HpuB, an 85 kDa iron-regulated hemoglobin-haptoglobin utilization outer membrane protein of Neisseria meningitidis. Isogenic mutants constructed by allelic replacement with a meningococcal hpu::mini-Tn3erm construct no longer expressed the 89-kDa protein. Mutants could not utilize hemoglobin to support growth but still grew on heme. Thus, the gonococcal HpuB homolog is a functional hemoglobin receptor and is essential for growth with hemoglobin.

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