Abstract：
:RNA secondary structures, e.g. stem-loops that are often found at the 5' and 3' ends of mRNAs, are in many cases known to be crucial for transcript stability but their role in prolonging the lifetime of transcripts remains elusive. In this study we show for an essential RNA-stabilizing stem-loop at the 5' end of rbcL gene transcripts in Chlamydomonas that it neither prevents ribonucleases from binding to the RNA nor impedes their movement along the RNA strand. The stem-loop has a formative function in that it mediates folding of a short sequence around its base into a specific RNA conformation, consisting of a helical and single-stranded region, i.e. the real structure required for longevity of rbcL transcripts in chloroplasts. Disturbing this structure renders transcripts completely unstable, even if the sequence of this element is not altered. The requirement of a specific 5' sequence and structure for RNA longevity suggests an interaction of this element with a trans-acting factor that protects transcripts from rapid degradation in chloroplasts.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Suay L,Salvador ML,Abesha E,Klein Udoi
10.1093/nar/gki760keywords:
subject
Has Abstractpub_date
2005-08-22 00:00:00pages
4754-61issue
15eissn
0305-1048issn
1362-4962pii
33/15/4754journal_volume
33pub_type
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