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• W2170293732 startingPage "4605" @default.
• W2170293732 abstract "3′-end processing of nucleus-encoded mRNAs includes the addition of a poly(A) tail that is important for translation initiation. Since the vast majority of chloroplast mRNAs acquire their 3′ termini by processing yet are not polyadenylated, we asked whether 3′ end maturation plays a role in chloroplast translation. A general characteristic of the 3′ untranslated regions of chloroplast mRNAs is an inverted repeat (IR) sequence that can fold into a stem-loop structure. These stem-loops and their flanking sequences serve as RNA 3′-end formation signals. Deletion of theChlamydomonas chloroplast atpB 3′ IR in strain Δ26 results in reduced accumulation of atpB transcripts and the chloroplast ATPase β-subunit, leading to weakly photosynthetic growth. Of the residualatpB mRNA in Δ26, approximately 1% accumulates as a discrete RNA of wild-type size, while the remainder is heterogeneous in length due to the lack of normal 3′ end maturation. In this work, we have analyzed whether these unprocessed atpBtranscripts are actively translated in vivo. We found that only the minority population of discrete transcripts of wild-type size is associated with polysomes and thus accounts for the ATPase β-subunit which accumulates in Δ26. Analysis of chloroplast rbcLmRNA revealed that transcripts extending beyond the mature 3′ end were not polysome associated. These results suggest that 3′-end processing of chloroplast mRNA is required for or strongly stimulates its translation." @default.
• W2170293732 created "2016-06-24" @default.
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• W2170293732 date "1998-08-01" @default.
• W2170293732 modified "2023-10-11" @default.
• W2170293732 title "3′-Processed mRNA Is Preferentially Translated in <i>Chlamydomonas reinhardtii</i> Chloroplasts" @default.
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• W2170293732 doi "https://doi.org/10.1128/mcb.18.8.4605" @default.
• W2170293732 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/109046" @default.
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