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uspA of Shigella sonnei

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One of the strategies that bacteria utilize to combat environmental stress is to synthesize stress-responding proteins. In Escherichia coli, adverse environmental factors, such as starvation, heat, and the presence of acid, oxidants, heavy metals, and antibiotics, trigger the expression of the universal stress protein (USP). The gene of the USP, uspA, in E. coli K-12 and E. coli O157:H7 has been identified and sequenced. In this study, the nucleotide sequence of uspA in a strain of Shigella sonnei implicated in the 1998 parsley-related outbreak of shigellosis was determined. Within an 800-bp region sequenced, there were 17 bp mismatches between the uspA of S. sonnei and that of E. coli K-12. Among the 17 mismatched nucleotides, 8 were within the structure gene of uspA. A total of 12 bp variations were identified between the uspA of S. sonnei and that of E. coli O157:H7, of which 5 bp were internal to the coding region of uspA. However, unlike the mismatches between the uspA of E. coli K-12 and the same gene of E. coli O157:H7 and S. sonnei that resulted in a single amino acid substitution and changed an alanine to an arginine at position 140, the mismatches between S. sonnei and E. coli O157:H7 were silent and did not result in any amino acid substitution.

Document Type: Research Article

Affiliations: Department of Food Science and Technology, The University of Georgia, 1109 Experiment Street, Griffin, Georgia 30223-1797, USA;, Tel: +770-412-4738, Fax: -770-412-4748, Email: jchen@griffin.uga.edu

Publication date: October 1, 2007

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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