2o4g
From Proteopedia
(New page: 200px<br /><applet load="2o4g" size="450" color="white" frame="true" align="right" spinBox="true" caption="2o4g, resolution 2.35Å" /> '''Structure of TREX1 i...) |
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| - | [[Image:2o4g.gif|left|200px]]<br /><applet load="2o4g" size=" | + | [[Image:2o4g.gif|left|200px]]<br /><applet load="2o4g" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2o4g, resolution 2.35Å" /> | caption="2o4g, resolution 2.35Å" /> | ||
'''Structure of TREX1 in complex with a nucleotide'''<br /> | '''Structure of TREX1 in complex with a nucleotide'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2O4G is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with MG and TMP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Exodeoxyribonuclease_III Exodeoxyribonuclease III], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.11.2 3.1.11.2] Full crystallographic information is available from [http:// | + | 2O4G is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with <scene name='pdbligand=MG:'>MG</scene> and <scene name='pdbligand=TMP:'>TMP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Exodeoxyribonuclease_III Exodeoxyribonuclease III], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.11.2 3.1.11.2] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2O4G OCA]. |
==Reference== | ==Reference== | ||
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[[Category: ww motif]] | [[Category: ww motif]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jan 23 12:19:30 2008'' |
Revision as of 10:19, 23 January 2008
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Structure of TREX1 in complex with a nucleotide
Overview
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.
About this Structure
2O4G is a Single protein structure of sequence from Mus musculus with and as ligands. Active as Exodeoxyribonuclease III, with EC number 3.1.11.2 Full crystallographic information is available from OCA.
Reference
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
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