Nuclearly encoded splicing factors implicated in RNA splicing in higher plant organelles.
Plant organelles arose from two independent endosymbiosis events. Throughout evolutionary history, tight control of chloroplasts and mitochondria has been gained by the nucleus, which regulates most steps of organelle genome expression and metabolism. In particular, RNA maturation, including RNA splicing, is highly dependent on nuclearly encoded splicing factors. Most introns in organelles are group II introns, whose catalytic mechanism closely resembles that of the nuclear spliceosome. Plant group II introns have lost the ability to self-splice in vivo and require nuclearly encoded proteins as cofactors. Since the first splicing factor was identified in chloroplasts more than 10 years ago, many other proteins have been shown to be involved in splicing of one or more introns in chloroplasts or mitochondria. These new proteins belong to a variety of different families of RNA binding proteins and provide new insights into ribonucleo-protein complexes and RNA splicing machineries in organelles. In this review, we describe how splicing factors, encoded by the nucleus and targeted to the organelles, take part in post-transcriptional steps in higher plant organelle gene expression. We go on to discuss the potential for these factors to regulate organelle gene expression.
de Longevialle
Andéol Falcon
AF
Unité Mixte de Recherche en Génomique Végétale (Institut National de la Recherche Agronomique/Centre National de la Recherche Scientifique/Université d'Evry Val d'Essonne), 91057 Evry, France.
Small
Ian D
ID
Lurin
Claire
C
D002736:Chloroplasts / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism; D008954:Models, Biological; D015388:Organelles / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D012326:RNA Splicing / Q000235:genetics / Q000502:physiology*; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*
D010940:Plant Proteins; D016601:RNA-Binding Proteins