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. 2003 Sep 15;374(Pt 3):799–805. doi: 10.1042/BJ20030533

Ribonuclease III-mediated processing of specific Neisseria meningitidis mRNAs.

Eliana De Gregorio 1, Chiara Abrescia 1, M Stella Carlomagno 1, Pier Paolo Di Nocera 1
PMCID: PMC1223648  PMID: 12826014

Abstract

Approx. 2% of the Neisseria meningitidis genome consists of small DNA insertion sequences known as Correia or nemis elements, which feature TIRs (terminal inverted repeats) of 26-27 bp in length. Elements interspersed with coding regions are co-transcribed with flanking genes into mRNAs, processed at double-stranded RNA structures formed by TIRs. N. meningitidis RNase III (endoribonuclease III) is sufficient to process nemis+ RNAs. RNA hairpins formed by nemis with the same termini (26/26 and 27/27 repeats) are cleaved. By contrast, bulged hairpins formed by 26/27 repeats inhibit cleavage, both in vitro and in vivo. In electrophoretic mobility shift assays, all hairpin types formed similar retarded complexes upon incubation with RNase III. The levels of corresponding nemis+ and nemis- mRNAs, and the relative stabilities of RNA segments processed from nemis+ transcripts in vitro, may both vary significantly.

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Selected References

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