Major alteration in coxsackievirus B3 genomic RNA structure distinguishes a virulent strain from an avirulent strain.
Bottom Line: Comparative sequence analysis of 170 closely related enteroviruses revealed that the SLII region lacks conservation.Neither the parent SLII nor the remaining domains of the background 5'UTR were structurally altered by the exchange, supporting an independent mechanism of folding and function.We show that the attenuated 5'UTR lacks structure in the SLII cardiovirulence determinant.
Affiliation: Biology Department, University of Nebraska at Omaha, Omaha, NE 68182, USA.Show MeSH
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Mentions: The structure of the SLII region was analysed with chemical probing analysis (Figure 1). A summary of the modification results at each position is displayed on models of SLII in Figure 2. The C-rich region ranging from positions 90–100 is shown at the top of Figure 1A and B. A strong stop at positions 99–100 partially obscures the results for the 90–100 region in Figure 1A and B. Despite the strong stop, a lack of reactivity is observed in the DMS lane for both CV-B3/28 and CV-B3/GA between positions 90 - 100, indicating that this C-rich region is not accessible to solvent. The A-U rich region spanning positions 100—110 is partially protected in both CV-B3/28 and CV-B3/GA (Figure 1A and B). Positions 102G, 103A, 104U, 105G and 106U are modified in CV-B3/GA. Likewise, for CV-B3/28, positions 101A, 102A, 103C, 104U, 105G and 106U are accessible.
Affiliation: Biology Department, University of Nebraska at Omaha, Omaha, NE 68182, USA.