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Systematic analysis of MYC regulators identifies AKIRIN2 as an essential mediator of nuclear proteasome import

ABSTRACT: AKIRIN2 is an essential negative regulator of MYC protein levels. To test the specificity of AKIRIN2-dependent MYC regulation we performed unbiased protein quantification after inducible AKIRIN2- or Proteasome knockout und identified subsets of proteins accumulating after loss of AKIRIN2, Proteasomes or both.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Colon, Blood

SUBMITTER: Richard Imre

LAB HEAD: Johannes Zuber

PROVIDER: PXD021898 | Pride | 2021-11-02

REPOSITORIES: pride

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			Action	DRS
	20190621_28_QExHFX2-4_Hinterndorfer_Zuber_IMP_sgRKO_TMT11plex_SCX_FR1-140_human_Limma-new.pdResult	Other
	20190621_QExHFX2_RSLC4_Hinterndorfer_Zuber_IMP_sgRKO_TMT_SCX_10per_FR49.raw	Raw
	20190621_QExHFX2_RSLC4_Hinterndorfer_Zuber_IMP_sgRKO_TMT_SCX_10per_FR50.raw	Raw
	20190621_QExHFX2_RSLC4_Hinterndorfer_Zuber_IMP_sgRKO_TMT_SCX_10per_FR51.raw	Raw
	20190621_QExHFX2_RSLC4_Hinterndorfer_Zuber_IMP_sgRKO_TMT_SCX_10per_FR52.raw	Raw

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Project description:We developed native elongating transcript sequencing (NET-seq, Churchman and Weissman Nature 2011, PMID: 21248844) combined with RNase footprinting of nascent transcripts (RNET-seq) to visualize translocation dynamics and nascent transcript errors in paused RNA polymerases in E. coli. We employed RNET-seq to the wild-type (WT) E. coli strain and to an isogenic strain deficient in genes for GreA and GreB (ΔgreAB). Gre factors and their eukaryotic analog TFIIS rescue backtracked complexes of RNAP. Briefly, the cells were rapidly lysed via spheroplasting, and the transcribing RNAPs were released from the genomic DNA by digestion with DNase I. Any ribosomes involved in co-transcriptional translation were separated from RNAP by digestion with RNase A. All RNAPs including those associated with the fragmented double-stranded DNAs and their 5’-truncated nascent RNAs were immobilized on Ni2+-NTA beads through the hexa-histidine-tagged β’ subunit and then extensively washed with a high-salt buffer. The 5’ ends of the transcripts in ECs were trimmed with RNase T1/V1 to leave a minimal length of RNA protected by RNAP. The RNases were subsequently removed by further washing of the beads. Elution with imidazole generated ECs carrying ~6-30 nt long transcripts. The nascent RNAs isolated from the ΔgreAB strain were longer than those from the WT strain and peaked at 18 nt versus 16 nt suggesting an enrichment of backtracked ECs, which is expected to occur in the absence of Gre-dependent 3’ RNA cleavage. The RNET-seq method involves trimming of excess nascent RNA from the 5’ ends leaving only the nascent RNA that is protected by RNAP. A previous in vitro study showed that an RNAP forming an EC protects different lengths of the 3’-proximal transcript from trimming by RNases A and T1 depending on the EC translocation state. Post-translocated, pre-translocated, and backtracked complexes protect 14-nt, 15-nt and >15-nt segments of the RNA, respectively. Because the very 3’ end of the RNA is extruded to a narrow pore within front of the enzyme during backtracking, the extruded RNA remains inaccessible to RNases increasing in length as backtracking increases. Thus, paused RNAP in either the pre- and post-translocated states as well as in different backtracked distances were monitored over the entire genome. The unique properties of our RNET-seq approach provided an opportunity to dissect the core mechanisms of different types of pausing in living cells.

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Systematic analysis of MYC regulators identifies AKIRIN2 as an essential mediator of nuclear proteasome import

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