Nucleic Acids Research, Vol 27, Issue 19 3866-3874, Copyright © 1999 by Oxford University Press
J Vogel, T Borner and WR Hess
The barley mutant albostrians and the maize mutants crs1 and crs2 are
defective in the splicing of various plastid group II introns. By analysing
tRNA precursors and several mRNAs not previously examined, the
investigation of in vivo splicing defects in these mutants has been
completed. The albostrians mutation causes the loss of plastid ribosomes
resulting secondarily in a disruption of splicing of all subgroup IIA
introns in the chloroplast. Thus MatK, the only putative chloroplast
intron-specific maturase of higher plants, might have evolved to function
in splicing of multiple introns. We show that in the case of
tRNA-Ala(UGC)the first step of splicing is affected, as suggested by the
absence of lariat molecules. Thus the plastid-encoded splicing factor
lacking in albostrians must participate in the formation of the
catalytically active structure. In contrast, a mutation in the nuclear gene
crs1 prevents splicing of only one intron but causes specific additional
effects as precursor transcripts for tRNA-Ile(GAU), tRNA-Ala(UGC),
tRNA-Lys(UUU)and tRNA-Val(UAC), but not tRNA-Gly(UCC), have significantly
enhanced steady-state levels in this mutant. Our data provide evidence for
a variety of splicing factors and pathways in the chloroplast, some encoded
by nuclear and some by chloroplast genes, and possibly for a dual function
of some of these factors.
ARTICLES
Comparative analysis of splicing of the complete set of chloroplast group II introns in three higher plant mutants
Humboldt-Universitat Berlin, Biologisches Institut/Genetik, Chausseestrasse 117, D-10115 Berlin, Germany.
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