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THE PLANT CELL, Vol 9, Issue 3 283-296, Copyright © 1997 by American Society of Plant Biologists
Nuclear Mutations That Block Group II RNA Splicing in Maize Chloroplasts Reveal Several Intron Classes with Distinct Requirements for Splicing Factors
B. D. Jenkins, D. J. Kulhanek and A. Barkan
Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403-1229
To elucidate mechanisms that regulate chloroplast RNA splicing in
multicellular plants, we sought nuclear mutations in maize that result in
chloroplast splicing defects. Evidence is presented for two nuclear genes
whose function is required for the splicing of group II introns in maize
chloroplasts. A mutation in the crs1 (for chloroplast RNA splicing 1) gene
blocks the splicing of only the atpF intron, whereas a mutation in the crs2
gene blocks the splicing of many chloroplast introns. In addition, a
correlation was observed between the absence of plastid ribosomes and the
failure to splice several chloroplast introns. Our results suggest that a
chloroplast-encoded factor and a nuclear-encoded factor whose activity
requires crs2 function facilitate the splicing of distinct sets of group II
introns. These two genetically defined intron sets also differ with regard
to intron structure: one set consists of only subgroup IIA introns and the
other of only subgroup IIB introns. Therefore, it is likely that distinct
splicing factors recognize subgroup-specific features of intron structure
or facilitate subgroup-specific aspects of the splicing reaction. Of the 12
pre-mRNA introns in the maize chloroplast genome, only one is normally
spliced in both crs2 mutants and in mutants lacking plastid ribosomes,
indicating that few, if any, of the group II introns in the chloroplast
genome undergo autocatalytic splicing in vivo.
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