2M22 | pdb_00002m22

Solution structure of the helix II template boundary element from Tetrahymena telomerase RNA

• PDB DOI: https://doi.org/10.2210/pdb2M22/pdb
• Entry: 2M22 supersedes: 2FRL
• BMRB: 18892
• NAKB: 2M22

• Classification: RNA
• Mutation(s): No 


• Deposited: 2012-12-11 Released: 2013-03-20 
• Deposition Author(s): Cash, D.D., Richards, R.J., Theimer, C.A., Finger, D.L., Feigon, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure of the helix II template boundary element from Tetrahymena telomerase RNA

Richards, R.J., Theimer, C.A., Finger, D.L., Feigon, J.

(2006) Nucleic Acids Res 34: 816-825

• PubMed: 16452301 
• DOI: https://doi.org/10.1093/nar/gkj481
• Primary Citation Related Structures: 
  2M22


• PubMed Abstract: 
  

  Telomere addition by telomerase requires an internal templating sequence located in the RNA subunit of telomerase. The correct boundary definition of this template sequence is essential for the proper addition of the nucleotide repeats. Incorporation of incorrect telomeric repeats onto the ends of chromosomes has been shown to induce chromosomal instability in ciliate, yeast and human cells. A 5' template boundary defining element (TBE) has been identified in human, yeast and ciliate telomerase RNAs. Here, we report the solution structure of the TBE element (helix II) from Tetrahymena thermophila telomerase RNA. Our results indicate that helix II and its capping pentaloop form a well-defined structure including unpaired, stacked adenine nucleotides in the stem and an unusual syn adenine nucleotide in the loop. A comparison of the T.thermophila helix II pentaloop with a pentaloop of the same sequence found in the 23S rRNA of the Haloarcula marismortui ribosome suggests possible RNA and/or protein interactions for the helix II loop within the Tetrahymena telomerase holoenzyme.

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Organizational Affiliation: 
• Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA.

Biological Assembly 1  

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 7.39 kDa 
• Atom Count: 489 
• Modeled Residue Count: 23 
• Deposited Residue Count: 23 
• Unique nucleic acid chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Length	Organism	Image
5'-R(*GP*GP*CP*AP*GP*AP*UP*CP*UP*GP*UP*AP*AP*UP*AP*GP*AP*AP*CP*UP*GP*CP*C)-3'	A	23	N/A

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2013-03-20 
Deposition Author(s): Cash, D.D., Richards, R.J., Theimer, C.A., Finger, D.L., Feigon, J.
• This entry supersedes: 2FRL

Revision History  

• Version 1.0: 2013-03-20
  Type: Initial release
  
• Version 1.1: 2013-05-01
  Changes: Advisory
• Version 1.2: 2023-06-14
  Changes: Data collection, Database references, Other
• Version 1.3: 2024-05-15
  Changes: Data collection, Database references