3eiq

From Proteopedia

(Difference between revisions)

Revision as of 22:08, 2 December 2018

Crystal structure of Pdcd4-eIF4A

Structural highlights

3eiq is a 3 chain structure with sequence from Human and Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[PDCD4_MOUSE] Note=Decreases benign tumor development and malignant progression.

Function

[IF4A1_HUMAN] ATP-dependent RNA helicase which is a subunit of the eIF4F complex involved in cap recognition and is required for mRNA binding to ribosome. In the current model of translation initiation, eIF4A unwinds RNA secondary structures in the 5'-UTR of mRNAs which is necessary to allow efficient binding of the small ribosomal subunit, and subsequent scanning for the initiator codon.^[1] ^[2] [PDCD4_MOUSE] Inhibits translation initiation and cap-dependent translation. May excert its function by hindering the interaction between EIF4A1 and EIF4G. Inhibits the helicase activity of EIF4A. Modulates the activation of JUN kinase. Down-regulates the expression of MAP4K1, thus inhibiting events important in driving invasion, namely, MAPK85 activation and consequent JUN-dependent transcription. May play a role in apoptosis. Tumor suppressor. Inhibits tumor promoter-induced neoplastic transformation. Binds RNA.^[3] ^[4] ^[5] ^[6]

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

Pdcd4 is a tumour suppressor protein. It inhibits translation through interaction with translation initiator eIF4A, resulting in the suppression of neoplastic transformation and tumour invasion. Here, we present the crystal structures of an N-terminal-truncated Pdcd4 in free form and in complex with eIF4A. Upon binding to eIF4A, Pdcd4 undergoes a marked conformational change to form a heterotrimeric complex with eIF4A, with one Pdcd4 binding to two eIF4A molecules in two different modes. The binding of Pdcd4 to eIF4A is required to inhibit the enzymatic activity of eIF4A, translation initiation, and AP-1-dependent transcription. Both MA3 domains are required to efficiently compete with the C-terminal domain of eIF4G (eIF4Gc) for binding to eIF4A whereas a single MA3 is sufficient to inhibit translation. Our structural and mutational analyses reveal that Pdcd4 inhibits translation initiation by trapping eIF4A in an inactive conformation, and blocking its incorporation into the eIF4F complex.

Structural basis for translational inhibition by the tumour suppressor Pdcd4.,Loh PG, Yang HS, Walsh MA, Wang Q, Wang X, Cheng Z, Liu D, Song H EMBO J. 2009 Feb 4;28(3):274-85. Epub 2009 Jan 15. PMID:19153607^[7]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Loh PG, Yang HS, Walsh MA, Wang Q, Wang X, Cheng Z, Liu D, Song H. Structural basis for translational inhibition by the tumour suppressor Pdcd4. EMBO J. 2009 Feb 4;28(3):274-85. Epub 2009 Jan 15. PMID:19153607 doi:10.1038/emboj.2008.278
↑ Chang JH, Cho YH, Sohn SY, Choi JM, Kim A, Kim YC, Jang SK, Cho Y. Crystal structure of the eIF4A-PDCD4 complex. Proc Natl Acad Sci U S A. 2009 Feb 9. PMID:19204291
↑ Yang HS, Jansen AP, Komar AA, Zheng X, Merrick WC, Costes S, Lockett SJ, Sonenberg N, Colburn NH. The transformation suppressor Pdcd4 is a novel eukaryotic translation initiation factor 4A binding protein that inhibits translation. Mol Cell Biol. 2003 Jan;23(1):26-37. PMID:12482958
↑ Bohm M, Sawicka K, Siebrasse JP, Brehmer-Fastnacht A, Peters R, Klempnauer KH. The transformation suppressor protein Pdcd4 shuttles between nucleus and cytoplasm and binds RNA. Oncogene. 2003 Jul 31;22(31):4905-10. PMID:12894233 doi:10.1038/sj.onc.1206710
↑ Jansen AP, Camalier CE, Colburn NH. Epidermal expression of the translation inhibitor programmed cell death 4 suppresses tumorigenesis. Cancer Res. 2005 Jul 15;65(14):6034-41. PMID:16024603 doi:65/14/6034
↑ LaRonde-LeBlanc N, Santhanam AN, Baker AR, Wlodawer A, Colburn NH. Structural basis for inhibition of translation by the tumor suppressor Pdcd4. Mol Cell Biol. 2007 Jan;27(1):147-56. Epub 2006 Oct 23. PMID:17060447 doi:10.1128/MCB.00867-06
↑ Loh PG, Yang HS, Walsh MA, Wang Q, Wang X, Cheng Z, Liu D, Song H. Structural basis for translational inhibition by the tumour suppressor Pdcd4. EMBO J. 2009 Feb 4;28(3):274-85. Epub 2009 Jan 15. PMID:19153607 doi:10.1038/emboj.2008.278

1 Structural highlights
2 Disease
3 Function
4 Evolutionary Conservation
5 Publication Abstract from PubMed
6 See Also
7 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3eiq"

@@ Line 1: / Line 1: @@
 ==Crystal structure of Pdcd4-eIF4A==
 <StructureSection load='3eiq' size='340' side='right' caption='[[3eiq]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[3eiq]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3EIQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3EIQ FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3eiq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3eiq OCA], [http://pdbe.org/3eiq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3eiq RCSB], [http://www.ebi.ac.uk/pdbsum/3eiq PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3eiq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3eiq OCA], [http://pdbe.org/3eiq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3eiq RCSB], [http://www.ebi.ac.uk/pdbsum/3eiq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3eiq ProSAT]</span></td></tr>
 </table>
 == Disease ==
@@ Line 13: / Line 14: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ei/3eiq_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ei/3eiq_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

3eiq

From Proteopedia

Revision as of 22:08, 2 December 2018

Crystal structure of Pdcd4-eIF4A

Structural highlights

Disease

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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