Molecular analysis of the fur (ferric uptake regulator) gene of a pathogenic Edwardsiella tarda strain.
The gene encoding the Edwardsiella tarda ferric uptake regulator (Fur(Et)) was cloned from a pathogenic E. tarda strain isolated from diseased fish. Fur(Et) shares 90% overall sequence identity with the Escherichia coli Fur (Fur(Ec)) and was able to complement the mutant phenotype of a fur (Ec)-defective E. coli strain. Mutational analysis indicated that C92S and C95S mutations inactivated Fur(Et) whereas E112K mutation resulted in a superactive Fur(Et) variant. Fur(Et) negatively regulated its own expression; interruption of this regulation impaired bacterial growth, altered the production of certain outer membrane proteins, and attenuated bacterial virulence.
Wang
Fang
F
Institute of Oceanology, Chinese Academy of Sciences, Qingdao, PR China.
Cheng
Shuang
S
Sun
Kun
K
Sun
Li
L
D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D020609:Edwardsiella tarda / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism / Q000472:pathogenicity; D004756:Enterobacteriaceae Infections / Q000382:microbiology / Q000662:veterinary*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005290:Ferric Compounds / Q000378:metabolism*; D005393:Fish Diseases / Q000382:microbiology*; D015964:Gene Expression Regulation, Bacterial; D009154:Mutation; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D014774:Virulence
D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D005290:Ferric Compounds; D012097:Repressor Proteins; C068477:ferric uptake regulating proteins, bacterial