2o4i | pdb_00002o4i

Structure of TREX1 in complex with DNA

spinqualitylabelsall models 2o4i, resolution 3.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2o4i is a 4 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.5Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TREX1_MOUSE Exonuclease with a preference for double stranded DNA with mismatched 3' termini. May play a role in DNA repair. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed TREX1 is the most abundant mammalian 3' --> 5' DNA exonuclease. It has been described to form part of the SET complex and is responsible for the Aicardi-Goutieres syndrome in humans. Here we show that the exonuclease activity is correlated to the binding preferences toward certain DNA sequences. In particular, we have found three motifs that are selected, GAG, ACA, and CTGC. To elucidate how the discrimination occurs, we determined the crystal structures of two murine TREX1 complexes, with a nucleotide product of the exonuclease reaction, and with a single-stranded DNA substrate. Using confocal microscopy, we observed TREX1 both in nuclear and cytoplasmic subcellular compartments. Remarkably, the presence of TREX1 in the nucleus requires the loss of a C-terminal segment, which we named leucine-rich repeat 3. Furthermore, we detected the presence of a conserved proline-rich region on the surface of TREX1. This observation points to interactions with proline-binding domains. The potential interacting motif "PPPVPRPP" does not contain aromatic residues and thus resembles other sequences that select SH3 and/or Group 2 WW domains. By means of nuclear magnetic resonance titration experiments, we show that, indeed, a polyproline peptide derived from the murine TREX1 sequence interacted with the WW2 domain of the elongation transcription factor CA150. Co-immunoprecipitation studies confirmed this interaction with the full-length TREX1 protein, thereby suggesting that TREX1 participates in more functional complexes than previously thought. Structure of the dimeric exonuclease TREX1 in complex with DNA displays a proline-rich binding site for WW Domains.,Brucet M, Querol-Audi J, Serra M, Ramirez-Espain X, Bertlik K, Ruiz L, Lloberas J, Macias MJ, Fita I, Celada A J Biol Chem. 2007 May 11;282(19):14547-57. Epub 2007 Mar 13. PMID:17355961 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Exonuclease 3D structures

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