Accession Number : AD1012241


Title :   Mutations in the Histone-like Nucleoid Structuring Regulatory Gene (hns) Decrease the Adherence of Shiga Toxin-producing Escherichia coli 091:H21 Strain B2F1 to Human Colonic Epithelial Cells and Increase the Production of Hemolysin


Descriptive Note : Technical Report


Corporate Author : Uniformed Services University Of The Health Sciences Bethesda United States


Personal Author(s) : Scott,Maria E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1012241.pdf


Report Date : 19 Oct 1999


Pagination or Media Count : 300


Abstract : Non-O157 serotype Shiga toxin-producing E. coli (STEC) cause a significant amountof food-borne hemorrhagic colitis (HC) and life-threatening hemolytic uremic syndrome(HUS) worldwide and yet these strains do not encode intimin, a major adherence factorencoded by the most common serotype 0157:H7 isolated from documented cases ofHC andHUS. In this investigation, we attempted to isolate specific adhesins critical for attachmentofintimin-negative STEC 091 :H21 to human colonic epithelial cells. Transposon mutagenesisof B2F1 was accomplished with the mini-Tn5phoACmf mobile element and a mutant bankof B2F1 colonies that carried putative in-frame PhoA-positive transposon insenions wasisolated.


Descriptors :   Mutations , genetics , Escherichia coli , epithelial cells , Hemolysins


Distribution Statement : APPROVED FOR PUBLIC RELEASE