| 2001 |
Human POP5 (hPop5) is a protein subunit of both RNase MRP and RNase P ribonucleoprotein complexes; it is localized to the nucleus and nucleolus in HeLa cells, and the evolutionarily conserved acidic C-terminal tail is not required for complex formation or RNase P activity. |
Co-immunoprecipitation with polyclonal anti-hPop5 antibodies, partial purification of catalytically active RNase P, immunofluorescence localization, and deletion analysis of C-terminal tail |
The Journal of biological chemistry |
High |
11413139
|
| 2006 |
Archaeal POP5 (Pfu Pop5) adopts an alpha-beta sandwich fold homologous to the RNA recognition motif (RRM) and to the bacterial RNase P protein subunit; it pairs with RPP30 to functionally reconstitute the catalytic domain of the RNase P RNA, and its interaction surface with RPP30 was mapped by NMR chemical shift perturbations. |
NMR spectroscopy and X-ray crystallography for structure determination; NMR chemical shift perturbation mapping of POP5–RPP30 interaction; functional reconstitution assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
16418270
|
| 2008 |
The POP5–RPP30 binary complex, but not the RPP21–RPP29 complex, enhances the rate of RNase P RNA-catalyzed pre-tRNA cleavage (~100-fold increase in k_obs) while both binary complexes reduce the monovalent and divalent ionic requirements for catalysis. |
In vitro reconstitution of Methanocaldococcus jannaschii RNase P using a pre-tRNA–RPR conjugate; kinetic assays measuring k_obs at defined pH and temperature |
Nucleic acids research |
High |
18558617
|
| 2010 |
The archaeal POP5–RPP30 binary complex is solely responsible for enhancing the RNase P RNA's rate of pre-tRNA cleavage (~60-fold), whereas RPP21–RPP29 contributes to increased substrate affinity (~16-fold); POP5–RPP30 can functionally reconstitute with bacterial and organellar RNase P RNAs, reflecting shared recognition of a phylogenetically conserved catalytic core. |
In vitro reconstitution of archaeal RNase P with recombinant RPP pairs from three archaea; single-turnover kinetics; heterologous assembly with bacterial and organellar RNase P RNAs |
Nucleic acids research |
High |
20705647
|
| 2010 |
POP5 and RPP29 are among the RNase P protein subunits that directly bind to the H1 RNA moiety of human RNase P in vitro; Rpp21 and Rpp29 are sufficient for reconstitution of endonucleolytic activity and bind to separate regions in the catalytic domain of H1 RNA. |
In vitro RNA-binding assays with refolded recombinant proteins; nuclease footprinting of H1 RNA |
Nucleic acids research |
Medium |
21450806
|
| 2010 |
Archaeal POP5 (PhoPop5) and RPP30 (PhoRpp30) function equivalently to the bacterial C5 protein in activating the catalytic C-domain of RNase P RNA, while RPP21 and RPP29 are implicated in stabilizing the specificity (S) domain; demonstrated using chimeric bacterial–archaeal RNase P RNAs. |
Chimeric RNA assembly combining C- and S-domains of bacterial (M1 RNA) and archaeal (PhopRNA) RNase P RNAs; pre-tRNA cleavage assays with individual and combined protein subunits |
Bioscience, biotechnology, and biochemistry |
Medium |
20139629
|
| 2010 |
L7Ae, a ribosomal protein, is a subunit of archaeal RNase P and its addition to the POP5–RPP30/RPP21–RPP29 reconstituted complex increases k_cat/K_m by ~360-fold for pre-tRNA cleavage; this stimulation requires conserved nucleotides in a kink-turn (K-turn) in the RNase P RNA and key L7Ae amino acids for K-turn binding. |
Co-elution of L7Ae with partially purified RNase P activity; in vitro reconstitution of RNase P with five proteins; kinetic assays; site-directed mutagenesis of K-turn and L7Ae residues |
Proceedings of the National Academy of Sciences of the United States of America |
High |
20675586
|
| 2011 |
Yeast/human Pop5 and Rpp1 (RPP30 homolog) form a heterodimer that binds directly to the conserved putative catalytic domain of RNase MRP RNA at a site corresponding to the protein binding site in bacterial RNase P RNA. |
Direct RNA-binding assays; structural and biochemical characterization of Pop5/Rpp1 heterodimer interaction with RNase MRP RNA |
RNA (New York, N.Y.) |
Medium |
21878546
|
| 2011 |
The POP5–RPP30 binary complex forms as a heterotetramer (two copies each of POP5 and RPP30) as revealed by NMR, ITC, light scattering and size exclusion chromatography; chemical shift perturbations on RPP30 upon addition of POP5 define the binding interface. |
NMR backbone resonance assignment and chemical shift perturbation mapping; isothermal titration calorimetry (ITC); light scattering; size exclusion chromatography |
Archaea (Vancouver, B.C.) |
High |
22162665
|
| 2012 |
POP5–RPP30 rescues the RNase P RNA's mis-cleavage tendency for a non-consensus pre-tRNA substrate by selectively enhancing correct cleavage (by ~11,140-fold versus ~480-fold for mis-cleavage), showing that POP5–RPP30 promotes cleavage fidelity independently of RPP21–RPP29; together the pairs rescue mis-cleavage by ~25-fold. |
In vitro single-turnover kinetics using Mja RNase P RNA–pre-tRNA(Gln) conjugate; reconstitution with individual or combined RPP pairs; rate measurements for correct versus mis-cleavage |
Nucleic acids research |
High |
22298511
|
| 2012 |
POP5–RPP30 (and RPP21–RPP29) can partially compensate for an 80-fold catalytic defect caused by deletion of a universally conserved bulged uridine in archaeal RNase P RNA, demonstrating cooperative protein–RNA rescue of structural defects; similarly, RPR can compensate for an RPP29 assembly-deficient mutant. |
Site-directed mutagenesis of archaeal RPR (deletion of bulged U); in vitro reconstitution and self-cleavage assays; isothermal titration calorimetry and NMR to assess RPP21–RPP29(ΔN) assembly |
Journal of molecular biology |
High |
21683084
|
| 2013 |
Extra-structural elements in the RRM fold of archaeal Pop5 (PhoPop5) — specifically C-terminal helices α4 (but not α5 alone) — are required for pre-tRNA cleavage activity and for RNA annealing/strand displacement activities; basic residues in α4 interact with PhopRNA while hydrophobic residues stabilize α4 orientation on the β-sheet. |
Deletion and point mutant reconstitution assays; FRET-based RNA annealing and strand displacement assays; structural analysis of PhoPop5 mutants |
Biochemical and biophysical research communications |
Medium |
24120499
|
| 2014 |
Surface-induced dissociation coupled with ion mobility mass spectrometry revealed that Pfu RNase P holoenzyme contains RPP21·RPP29 in 1:1 stoichiometry and POP5·RPP30 as a dimer-of-dimers in solution, but a 1:1 stoichiometry for all subunits when bound to the cognate RNase P RNA. |
Surface-induced dissociation (SID) mass spectrometry; ion mobility mass spectrometry (IM-MS); native mass spectrometry |
Angewandte Chemie (International ed. in English) |
High |
25195671
|
| 2014 |
L7Ae binds to two kink-turn motifs located in both the catalytic and specificity domains of Pyrococcus furiosus RNase P RNA, as mapped by site-specific hydroxyl radical-mediated footprinting using single-Cys L7Ae derivatives conjugated with EDTA-Fe; the enzyme assembly for footprinting included POP5, RPP21, RPP29, RPP30, and L7Ae. |
Site-specific hydroxyl radical footprinting with single-Cys L7Ae–EDTA-Fe conjugates; in vitro reconstitution of RNase P holoenzyme with all five protein cofactors (including POP5) |
Nucleic acids research |
High |
25361963
|
| 2015 |
The PhoPop5–PhoRpp30 heterotetramer [PhoRpp30-(PhoPop5)2-PhoRpp30] binds strongly to a stem-loop SL3 oligonucleotide in PhopRNA via the C-terminal helix α4 of PhoPop5, whereas PhoPop5 alone has markedly reduced SL3 affinity; PhoRpp30 assists PhoPop5 in attaining a functionally active conformation by shielding its hydrophobic surfaces. |
Surface plasmon resonance (SPR) analysis of protein–RNA interactions; gel filtration chromatography; SPR with PhoPop5 point mutants |
Journal of biochemistry |
Medium |
26152732
|
| 2015 |
Crystal structures of Thermococcus kodakarensis TkoRpp30 alone and in complex with TkoPop5 reveal that TkoPop5 folds into an RRM-like fold and TkoRpp30 into a TIM barrel, highly conserved with their Pyrococcus horikoshii counterparts; functional interchangeability was confirmed by in vitro reconstitution. |
X-ray crystallography of TkoRpp30 and TkoRpp30–TkoPop5 complex; in vitro reconstitution and pre-tRNA cleavage assays with heterologous protein substitutions |
Bioscience, biotechnology, and biochemistry |
High |
25704799
|
| 2022 |
Native mass spectrometry and mass photometry of Mja RNase P validate a monomeric holoenzyme (one RPR + one copy each of POP5, RPP30, RPP21, RPP29, and up to two copies of L7Ae) in vitro; abolishing all canonical kink-turn–L7Ae interactions by mutagenesis does not impair assembly or activity due to redundant protein–protein interactions between L7Ae and other RPPs including POP5. |
Native mass spectrometry; mass photometry; mutagenesis of all kink-turns in the RPR; biochemical activity assays |
Nucleic acids research |
High |
35848927
|
| 2024 |
Overexpression of human POP5 in K562 blood cells lengthens telomeres; CRISPR/Cas9 deletion of the predicted causal genomic region reduces POP5 expression, linking a GWAS locus to transcriptional regulation of POP5 and telomere length regulation. |
Overexpression of POP5 with telomere length measurement; CRISPR/Cas9 deletion of predicted causal genomic region; expression quantification |
Nature communications |
Medium |
38789417
|
| 2026 |
The bacterial Escherichia coli RNase P protein (RnpA) can activate the H1 RNA C-domain variants at low Mg2+ concentration, indicating that bacterial RnpA and eukaryotic Pop5 recognize common C-domain core elements in all RNase P RNAs, suggesting functional overlap in their roles in RNA catalytic activation. |
In vitro reconstitution of H1 RNA variants with E. coli RnpA; Pb2+-probing; UV melting profiles; comparative activity assays |
Chembiochem : a European journal of chemical biology |
Medium |
41889098
|