title: Construction and consequences of directed mutations affecting the hemin receptor in pathogenic Corynebacterium species.
abstract: Genes encoding an ATP-binding cassette transporter system involved in hemin iron utilization from Corynebacterium ulcerans were cloned and characterized. The genes are homologous to a hemin transport system previously identified in Corynebacterium diphtheriae. Disruption of the hmuT gene, which encodes the putative hemin receptor, resulted in greatly reduced ability of C. ulcerans to use hemin or hemoglobin as an iron source. Inactivation of hmuT in C. diphtheriae by site-specific recombination had no effect on hemin utilization, which suggests that C. diphtheriae has an additional system for transporting hemin.
authors.affiliation: Laboratory of Bacterial Toxins, Division of Bacterial, Allergenic and Parasitic Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892, USA. schmitt@cber.fda.gov
authors.forename: M P
authors.initials: MP
authors.lastname: Schmitt
authors.forename: E S
authors.initials: ES
authors.lastname: Drazek
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics; D001692:Biological Transport; D003001:Cloning, Molecular; D003352:Corynebacterium / Q000235:genetics* / Q000472:pathogenicity*; D003353:Corynebacterium diphtheriae / Q000235:genetics / Q000472:pathogenicity; D005816:Genetic Complementation Test; D006427:Hemin / Q000378:metabolism*; D008074:Lipoproteins; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D011956:Receptors, Cell Surface / Q000235:genetics*; D015183:Restriction Mapping; D014774:Virulence / Q000235:genetics
chemical_list: D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; C408133:HmuT protein, Corynebacterium diphtheriae; C422478:HmuT protein, Corynebacterium ulcerans; C422479:HmuU protein, Corynebacterium ulcerans; C422480:HmuV protein, Corynebacterium ulcerans; D008074:Lipoproteins; D011956:Receptors, Cell Surface; D006427:Hemin