6U7V

xRRM structure of spPof8

• PDB DOI: https://doi.org/10.2210/pdb6U7V/pdb

• Classification: GENE REGULATION
• Organism(s): Schizosaccharomyces pombe 972h-
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-09-03 Released: 2020-09-09 
• Deposition Author(s): Kim, J.-K., Hu, X., Yu, C., Jun, H.-I., Liu, J., Sankaran, B., Huang, L., Qiao, F.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.42 Å
• R-Value Free: 0.191 
• R-Value Work: 0.170 
• R-Value Observed: 0.171 

Literature

Quality-Control Mechanism for Telomerase RNA Folding in the Cell.

Hu, X., Kim, J.K., Yu, C., Jun, H.I., Liu, J., Sankaran, B., Huang, L., Qiao, F.

(2020) Cell Rep 33: 108568-108568

• PubMed: 33378677 
• DOI: https://doi.org/10.1016/j.celrep.2020.108568
• Primary Citation of Related Structures:  
  6U7V


• PubMed Abstract: 
  

  Long non-coding RNAs can often fold into different conformations. Telomerase RNA, an essential component of the telomerase ribonucleoprotein (RNP) enzyme, must fold into a defined structure to fulfill its function with the protein catalytic subunit (TERT) and other accessory factors. However, the mechanism by which the correct folding of telomerase RNA is warranted in a cell is still unknown. Here we show that La-related protein Pof8 specifically recognizes the conserved pseudoknot region of telomerase RNA and instructs the binding of the Lsm2-8 complex to its mature 3' end, thus selectively protecting the correctly folded RNA from exonucleolytic degradation. In the absence of Pof8, TERT assembles with misfolded RNA and produces little telomerase activity. Therefore, Pof8 plays a key role in telomerase RNA folding quality control, ensuring that TERT only assembles with functional telomerase RNA to form active telomerase. Our finding reveals a mechanism for non-coding RNA folding quality control.

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Organizational Affiliation: 

Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 15.55 kDa 
• Atom Count: 1,231 
• Modelled Residue Count: 116 
• Deposited Residue Count: 130 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein pof8	A	130	Schizosaccharomyces pombe 972h-	Mutation(s): 0  Gene Names: pof8, SPAC17G6.17
UniProt
Find proteins for O13795 (Schizosaccharomyces pombe (strain 972 / ATCC 24843)) Explore O13795  Go to UniProtKB:  O13795

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NO3	B [auth A]	NITRATE ION N O3 NHNBFGGVMKEFGY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.42 Å
• R-Value Free: 0.191 
• R-Value Work: 0.170 
• R-Value Observed: 0.171 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.672	α = 90
b = 57.672	β = 90
c = 71.014	γ = 120

Software Package:

Software Name	Purpose
HKL-2000	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
SHELXDE	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-09-09 
Deposition Author(s): Kim, J.-K., Hu, X., Yu, C., Jun, H.-I., Liu, J., Sankaran, B., Huang, L., Qiao, F.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM098943

Revision History  

• Version 1.0: 2020-09-09
  Type: Initial release
  
• Version 1.1: 2021-03-24
  Changes: Database references