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This heterogeneity is intriguing, promoting studies trying to characterize these novel proteins and to better comprehend this pathotype group. In a previous study analyzing low\u2010molecular mass proteomes of four representative aEPEC strains of three different adhesion phenotypes, we classified proteins according to their annotated function, with most of them being involved in metabolism and transport; while some of them were classified as hypothetical proteins. The majority of the hypothetical proteins were homologue products of genes identified in the genome of enterohemorrhagic <jats:italic>E. coli<\/jats:italic>. One of the hypothetical proteins was annotated as Z2335, with orthologue in EPEC, and by bioinformatics analysis, this protein was revealed to be the universal stress protein F (UspF). Thus, herein we successfully obtained a recombinant UspF protein from aEPEC, which is a \u03b1\/\u03b2, ATP\u2010binding protein involved in stress response, with comparable protein production among the four studied strains, but showing noteworthy differences when cultivated in different stress conditions, also present in other enterobacterial species, such as <jats:italic>Shigella sonnei<\/jats:italic> and <jats:italic>Citrobacter freundii<\/jats:italic>. Furthermore, our results confirm that the Usp protein superfamily encompasses a conserved group of proteins involved in stress resistance in aEPEC and other <jats:italic>Enterobacteriaceae<\/jats:italic>.<\/jats:p>","DOI":"10.1002\/pro.3038","type":"journal-article","created":{"date-parts":[[2016,9,12]],"date-time":"2016-09-12T08:43:23Z","timestamp":1473669803000},"page":"2142-2151","source":"Crossref","is-referenced-by-count":17,"title":["Characterization of the universal stress protein F from atypical enteropathogenic <i>Escherichia coli<\/i> and its prevalence in <i>Enterobacteriaceae<\/i>"],"prefix":"10.1002","volume":"25","author":[{"given":"Cristiane S.","family":"de Souza","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Bacteriologia Instituto Butantan S\u00e3o Paulo SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alfredo G.","family":"Torres","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology University of Texas Medical Branch Galveston Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andressa","family":"Caravelli","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Bacteriologia Instituto Butantan S\u00e3o Paulo SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anderson","family":"Silva","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Bacteriologia Instituto Butantan S\u00e3o Paulo SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juliana M.","family":"Polatto","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Bacteriologia Instituto Butantan S\u00e3o Paulo SP Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roxane M. 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