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Journal Article
- Crystal structure of Streptomyces coelicolor RraAS2, an unusual member of the RNase E inhibitor RraA protein family
- Nohra Park 1, Jihune Heo 2, Saemee Song 1, Inseong Jo 1, Kangseok Lee 2, Nam-Chul Ha 1
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Journal of Microbiology 2017;55(5):388-395.
DOI: https://doi.org/10.1007/s12275-017-7053-8
Published online: April 29, 2017
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Corresponding author:
Kangseok Lee , Tel: +82-2-820-5241,
Nam-Chul Ha , Tel: +82-2-820-5241,
Abstract
Bacterial ribonuclease E (RNase E) plays a crucial role in the processing and decay of RNAs. A small protein named RraA negatively regulates the activity of RNase E via protein-protein interaction in various bacteria. Recently, RraAS1 and RraAS2, which are functional homologs of RraA from Escherichia coli, were identified in the Gram-positive species Streptomyces coelicolor. RraAS1 and RraAS2 inhibit RNase ES ribonuclease activity in S. coelicolor. RraAS1 and RraAS2 have a C-termi-nal extension region unlike typical bacterial RraA proteins. In this study, we present the crystal structure of RraAS2, ex-hibiting a hexamer arranged in a dimer of trimers, consistent with size exclusion chromatographic results. Importantly, the C-terminal extension region formed a long α-helix at the junction of the neighboring subunit, which is similar to the trimeric RraA orthologs from Saccharomyces cerevisiae. Trun-cation of the C-terminal extension region resulted in loss of RNase ES inhibition, demonstrating its crucial role. Our find-ings present the first bacterial RraA that has a hexameric assembly with a C-terminal extension α-helical region, which plays an essential role in the regulation of RNase ES activity in S. coelicolor.
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