2DOK: Crystal Structure Of The Pin Domain Of Human Est1a

Saccharomyces cerevisiae Est1p is a telomerase-associated protein essential for telomere length homeostasis. hEST1A is one of the three human Est1p homologues and is considered to be involved not only in regulation of telomere elongation or capping but also in nonsense-mediated degradation of RNA. hEST1A is composed of two conserved regions, Est1p homology and PIN (PilT N-terminus) domains. The present study shows the crystal structure of the PIN domain at 1.8 A resolution. The overall structure is composed of an alpha/beta fold or a core structure similar to the counterpart of 5' nucleases and an extended structure absent from archaeal PIN-domain proteins and 5' nucleases. The structural properties of the PIN domain indicate its putative active center consisting of invariant acidic amino acid residues, which is geometrically similar to the active center of 5' nucleases and an archaeal PAE2754 PIN-domain protein associated with exonuclease activity.
PDB ID: 2DOKDownload
MMDB ID: 45445
PDB Deposition Date: 2006/5/1
Updated in MMDB: 2007/11
Experimental Method:
x-ray diffraction
Resolution: 1.8  Å
Source Organism:
Similar Structures:
Biological Unit for 2DOK: monomeric; determined by author and by software (PQS)
Molecular Components in 2DOK
Label Count Molecule
Protein (1 molecule)
Telomerase-binding Protein Est1a(Gene symbol: SMG6)
Molecule annotation
* Click molecule labels to explore molecular sequence information.

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