Journal: The Journal of Biological Chemistry
Article Title: Mapping the MOB proteins’ proximity network reveals a unique interaction between human MOB3C and the RNase P complex
doi: 10.1016/j.jbc.2023.105123
Figure Lengend Snippet: MOB3C interacts with catalytically active RNase P complex. A , coimmunoprecipitation assay for YFP-tagged POP1 and RPP30 with FLAG-tagged MOB3C in HeLa cells. B , schematic outline for the affinity purification–mass spectrometry (AP–MS) with DSP crosslinking (CL). A Western blot analysis validating the used cell lines in AP–MS is shown. C , Venn diagram showing the commonly defined proteins in the BioID and crosslinked AP–MS datasets. The table displays the average spectral counts of each RNase P subunit defined in the AP–MS dataset. D , a proximity network of the RNase P protein subunits defined in both the MOB3C BioID and AP–MS datasets in reference to BioGrid (see the section). E , pre-tRNA cleavage assay of the pull-down experiments using GST-MOB1A or GST-MOB3C. Time-course reactions showing RNase P activity when GST-MOB3C, but not GST-MOB1A, was used. +: a positive control of pre-tRNA Arg cleaved by recombinant Escheichia coli RNase P; –: a negative control of pre-tRNA Arg without enzyme; I: input. F , SDS-PAGE analysis confirms the presence of GST-MOB3C and GST-MOB1A post-pulldown. DSP, dithiobis (succinimidyl propionate); EV, empty vector; GST, glutathione- S -transferase; MOB, monopolar spindle-one-binder.
Article Snippet: YFP-POP1 expression vector was generated by amplifying the POP1 cDNA from pCMVh-POP1-3xFLAG (gift from Martin Dorf; Addgene #53968) with flanking XhoI and SalI restriction sites and ligating it into the multicloning site of YFP-C1 backbone vector by swabbing out the YFP-RPP30.
Techniques: Co-Immunoprecipitation Assay, Affinity Purification, Mass Spectrometry, Western Blot, Cleavage Assay, Activity Assay, Positive Control, Recombinant, Negative Control, SDS Page, Plasmid Preparation