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2016 ; 113
(42
): E6476-E6485
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The Architecture of Trypanosoma brucei editosomes
#MMPMID27708162
McDermott SM
; Luo J
; Carnes J
; Ranish JA
; Stuart K
Proc Natl Acad Sci U S A
2016[Oct]; 113
(42
): E6476-E6485
PMID27708162
show ga
Uridine insertion and deletion RNA editing generates functional mitochondrial
mRNAs in Trypanosoma brucei Editing is catalyzed by three distinct ?20S
editosomes that have a common set of 12 proteins, but are typified by mutually
exclusive RNase III endonucleases with distinct cleavage specificities and unique
partner proteins. Previous studies identified a network of protein-protein
interactions among a subset of common editosome proteins, but interactions among
the endonucleases and their partner proteins, and their interactions with common
subunits were not identified. Here, chemical cross-linking and mass spectrometry,
comparative structural modeling, and genetic and biochemical analyses were used
to define the molecular architecture and subunit organization of purified
editosomes. We identified intra- and interprotein cross-links for all editosome
subunits that are fully consistent with editosome protein structures and
previously identified interactions, which we validated by genetic and biochemical
studies. The results were used to create a highly detailed map of editosome
protein domain proximities, leading to identification of molecular interactions
between subunits, insights into the functions of noncatalytic editosome proteins,
and a global understanding of editosome architecture.