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• W2171197975 abstract "The mouse hepatitis virus (MHV) sequences required for replication of the JHM strain of MHV defective interfering (DI) RNA consist of three discontinuous genomic regions: about 0.47 kb from both terminal sequences and a 0.13-kb internal region present at about 0.9 kb from the 5' end of the DI genome. In this study, we investigated the role of the internal 0.13-kb region in MHV RNA replication. Overall sequences of the 0.13-kb regions from various MHV strains were similar to each other, with nucleotide substitutions in some strains; MHV-A59 was exceptional, with three nucleotide deletions. Computer-based secondary-structure analysis of the 0.13-kb region in the positive strand revealed that most of the MHV strains formed the same or a similar main stem-loop structure, whereas only MHV-A59 formed a smaller main stem-loop structure. The RNA secondary structures in the negative strands were much less uniform among the MHV strains. A series of DI RNAs that contained MHV-JHM-derived 5'- and 3'-terminal sequences plus internal 0.13-kb regions derived from various MHV strains were constructed. Most of these DI RNAs replicated in MHV-infected cells, except that MRP-A59, with a 0.13-kb region derived from MHV-A59, failed to replicate. Interestingly, replication of MRP-A59 was temperature dependent; it occurred at 39.5 degrees C but not at 37 or 35 degrees C, whereas a DI RNA with an MHV-JHM-derived 0.13-kb region replicated at all three temperatures. At 37 degrees C, synthesis of MRP-A59 negative-strand RNA was detected in MHV-infected and MRP-A59 RNA-transfected cells. Another DI RNA with the internal 0.13-kb region deleted also synthesized negative-strand RNA in MHV-infected cells. MRP-A59-transfected cells were shifted from 39.5 to 37 degrees C at 5.5 h postinfection, a time when most MHV negative-strand RNAs have already accumulated; after the shift, MRP-A59 positive-strand RNA synthesis ceased. The minimum sequence required for maintenance of the positive-strand major stem-loop structure and biological function of the MHV-JHM 0.13-kb region was about 57 nucleotides. Function was lost in the 50-nucleotide sequence that formed a positive-strand stem-loop structure identical to that of MHV-A59. These studies suggested that the RNA structure made by the internal sequence was important for positive-strand MHV RNA synthesis." @default.
• W2171197975 created "2016-06-24" @default.
• W2171197975 creator A5042004715 @default.
• W2171197975 creator A5050640433 @default.
• W2171197975 date "1995-08-01" @default.
• W2171197975 modified "2023-09-25" @default.
• W2171197975 title "Characterization of a murine coronavirus defective interfering RNA internal cis-acting replication signal" @default.
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• W2171197975 doi "https://doi.org/10.1128/jvi.69.8.4963-4971.1995" @default.
• W2171197975 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/189312" @default.
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