3u4z

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Crystal Structure of the Tetrahymena telomerase processivity factor Teb1 OB-BCrystal Structure of the Tetrahymena telomerase processivity factor Teb1 OB-B

Structural highlights

3u4z is a 2 chain structure with sequence from Tetrahymena thermophila. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.3Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TEB1_TETTS Single-stranded DNA (ssDNA)-binding protein that mediates the recruitment of telomerase to telomeric DNA (PubMed:19941821, PubMed:20363756, PubMed:25225329, PubMed:22143754). Telomerase is an essential ribonucleoprotein (RNP) enzyme that copies new telomeric repeats onto chromosome ends by repetitively synthesizing the short telomere-repeat sequence 5'-TTGGGG-3' using an RNA template component TER (PubMed:19941821). Acts as part of a replication protein A (RPA)-related subcomplex of the holoenzyme telomerase ribonucleoprotein complex: TEB1 specifically recognizes and binds telomeric ssDNA, thereby mediating the recruitment of the holoenzyme telomerase RNP complex to telomeres (PubMed:19941821, PubMed:25225329, PubMed:27895115). TEB1 is related to RPA1 subunit of the RPA complex but is specific to telomeric DNA, which is not the case of RPA1 (PubMed:25225329).[1] [2] [3] [4] [5]

See Also

References

  1. ↑ Min B, Collins K. An RPA-related sequence-specific DNA-binding subunit of telomerase holoenzyme is required for elongation processivity and telomere maintenance. Mol Cell. 2009 Nov 25;36(4):609-19. PMID:19941821 doi:10.1016/j.molcel.2009.09.041
  2. ↑ Min B, Collins K. Multiple mechanisms for elongation processivity within the reconstituted tetrahymena telomerase holoenzyme. J Biol Chem. 2010 May 28;285(22):16434-43. PMID:20363756 doi:10.1074/jbc.M110.119172
  3. ↑ Zeng Z, Min B, Huang J, Hong K, Yang Y, Collins K, Lei M. Structural basis for Tetrahymena telomerase processivity factor Teb1 binding to single-stranded telomeric-repeat DNA. Proc Natl Acad Sci U S A. 2011 Dec 20;108(51):20357-61. Epub 2011 Dec 5. PMID:22143754 doi:10.1073/pnas.1113624108
  4. ↑ Upton HE, Hong K, Collins K. Direct single-stranded DNA binding by Teb1 mediates the recruitment of Tetrahymena thermophila telomerase to telomeres. Mol Cell Biol. 2014 Nov 15;34(22):4200-12. PMID:25225329 doi:10.1128/MCB.01030-14
  5. ↑ Upton HE, Chan H, Feigon J, Collins K. Shared Subunits of Tetrahymena Telomerase Holoenzyme and Replication Protein A Have Different Functions in Different Cellular Complexes. J Biol Chem. 2017 Jan 6;292(1):217-228. PMID:27895115 doi:10.1074/jbc.M116.763664

3u4z, resolution 2.30Å

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