TY - JOUR
T1 - Small nucleolar RNAs controlling rRNA processing in Trypanosoma brucei
AU - Chikne, Vaibhav
AU - Rajan, K. Shanmugha
AU - Shalev-Benami, Moran
AU - Decker, Kathryn
AU - Cohen-Chalamish, Smadar
AU - Madmoni, Hava
AU - Biswas, Viplov K.
AU - Gupta, Sachin Kumar
AU - Doniger, Tirza
AU - Unger, Ron
AU - Tschudi, Christian
AU - Ullu, Elisabetta
AU - Michaeli, Shulamit
N1 - Publisher Copyright:
© The Author(s) 2019. Published by Oxford University Press on behalf of Nucleic Acids Research. This is an Open Access article distributed under the terms of the Creative Commons Attribution License
PY - 2019/3/18
Y1 - 2019/3/18
N2 - In trypanosomes, in contrast to most eukaryotes, the large subunit (LSU) ribosomal RNA is fragmented into two large and four small ribosomal RNAs (srRNAs) pieces, and this additional processing likely requires trypanosome-specific factors. Here, we examined the role of 10 abundant small nucleolar RNAs (snoRNAs) involved in rRNA processing. We show that each snoRNA involved in LSU processing associates with factors engaged in either early or late biogenesis steps. Five of these snoRNAs interact with the intervening sequences of rRNA precursor, whereas the others only guide rRNA modifications. The function of the snoRNAs was explored by silencing snoRNAs. The data suggest that the LSU rRNA processing events do not correspond to the order of rRNA transcription, and that srRNAs 2, 4 and 6 which are part of LSU are processed before srRNA1. Interestingly, the 6 snoRNAs that affect sr-RNA1 processing guide modifications on rRNA positions that span locations from the protein exit tunnel to the srRNA1, suggesting that these modifications may serve as check-points preceding the liberation of srRNA1. This study identifies the highest number of snoRNAs so far described that are involved in rRNA processing and/or rRNA folding and highlights their function in the unique trypanosome rRNA maturation events.
AB - In trypanosomes, in contrast to most eukaryotes, the large subunit (LSU) ribosomal RNA is fragmented into two large and four small ribosomal RNAs (srRNAs) pieces, and this additional processing likely requires trypanosome-specific factors. Here, we examined the role of 10 abundant small nucleolar RNAs (snoRNAs) involved in rRNA processing. We show that each snoRNA involved in LSU processing associates with factors engaged in either early or late biogenesis steps. Five of these snoRNAs interact with the intervening sequences of rRNA precursor, whereas the others only guide rRNA modifications. The function of the snoRNAs was explored by silencing snoRNAs. The data suggest that the LSU rRNA processing events do not correspond to the order of rRNA transcription, and that srRNAs 2, 4 and 6 which are part of LSU are processed before srRNA1. Interestingly, the 6 snoRNAs that affect sr-RNA1 processing guide modifications on rRNA positions that span locations from the protein exit tunnel to the srRNA1, suggesting that these modifications may serve as check-points preceding the liberation of srRNA1. This study identifies the highest number of snoRNAs so far described that are involved in rRNA processing and/or rRNA folding and highlights their function in the unique trypanosome rRNA maturation events.
UR - http://www.scopus.com/inward/record.url?scp=85062828755&partnerID=8YFLogxK
U2 - 10.1093/nar/gky1287
DO - 10.1093/nar/gky1287
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C2 - 30605535
SN - 0305-1048
VL - 47
SP - 2609
EP - 2629
JO - Nucleic Acids Research
JF - Nucleic Acids Research
IS - 5
ER -