期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 43, 页码 11483-11487出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201405362
关键词
ion mobility; native mass spectrometry; RNA-protein complexes; RNaseP; stoichiometry; surface-induced dissociation
资金
- NSF [MCB-0843543, DBI-0923551]
- NIH [RO1 GM067807]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [0843543] Funding Source: National Science Foundation
We demonstrate that surface-induced dissociation (SID) coupled with ion mobility mass spectrometry (IM-MS) is a powerful tool for determining the stoichiometry of a multi-subunit ribonucleoprotein (RNP) complex assembled in a solution containing Mg2+. We investigated Pyrococcus furiosus (Pfu) RNaseP, an archaeal RNP that catalyzes tRNA 5 maturation. Previous step-wise, Mg2+-dependent reconstitutions of Pfu RNaseP with its catalytic RNA subunit and two interacting protein cofactor pairs (RPP21RPP29 and POP5RPP30) revealed functional RNP intermediates enroute to the RNaseP enzyme, but provided no information on subunit stoichiometry. Our native MS studies with the proteins showed RPP21RPP29 and (POP5RPP30)(2) complexes, but indicated a 1:1 composition for all subunits when either one or both protein complexes bind the cognate RNA. These results highlight the utility of SID and IM-MS in resolving conformational heterogeneity and yielding insights on RNP assembly.
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