Architecture of the trypanosome RNA editing accessory complex, MRB1

0381882 - BC 2013 RIV GB eng J - Journal Article
Ammerman, M. L. - Downey, K. M. - Hashimi, Hassan - Fisk, J. C. - Tomasello, D. L. - Faktorová, Drahomíra - Kafková, L. - King, T. - Lukeš, Julius - Read, L. K.
Architecture of the trypanosome RNA editing accessory complex, MRB1.
Nucleic Acids Research. Roč. 40, č. 12 (2012), s. 5637-5650. ISSN 0305-1048. E-ISSN 1362-4962
R&D Projects: GA ČR GA204/09/1667
Institutional support: RVO:60077344
Keywords : BINDING COMPLEX * PROTEIN * BRUCEI * TANDEM * TRANSCRIPTOME * MITOCHONDRIA * INTERACTS * TBRGG2
Subject RIV: EB - Genetics ; Molecular Biology
Impact factor: 8.278, year: 2012
http://nar.oxfordjournals.org/content/40/12/5637.full

Trypanosoma brucei undergoes an essential process of mitochondrial uridine insertion and deletion RNA editing catalyzed by a 20S editosome. The multiprotein mitochondrial RNA-binding complex 1 (MRB1) is emerging as an equally essential component of the trypanosome RNA editing machinery, with additional functions in gRNA and mRNA stabilization. The distinct and overlapping protein compositions of reported MRB1 complexes and diverse MRB1 functions suggest that the complex is composed of subcomplexes with RNA-dependent and independent interactions. To determine the architecture of the MRB1 complex, we performed a comprehensive yeast two-hybrid analysis of 31 reported MRB1 proteins. We also used in vivo analyses of tagged MRB1 components to confirm direct and RNA-mediated interactions. Here, we show that MRB1 contains a core complex comprised of six proteins and maintained by numerous direct interactions. The MRB1 core associates with multiple subcomplexes and proteins through RNA-enhanced or RNA-dependent interactions. These findings provide a framework for interpretation of previous functional studies and suggest that MRB1 is a dynamic complex that coordinates various aspects of mitochondrial gene regulation.
Permanent Link: http://hdl.handle.net/11104/0212252