2j3e

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(Difference between revisions)

Revision as of 23:42, 11 September 2015

Dimerization is important for the GTPase activity of chloroplast translocon components atToc33 and psToc159

Structural highlights

2j3e is a 1 chain structure with sequence from Arath. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[TOC33_ARATH] GTPase involved in protein precursor import into chloroplasts. Seems to recognize chloroplast-destined precursor proteins and regulate their presentation to the translocation channel through GTP hydrolysis. Binds GTP, GDP, XTP, but not ATP. Probably specialized in the import of nuclear encoded photosynthetic preproteins from the cytoplasm to the chloroplast, especially during early development stages.^[1] ^[2] ^[3] ^[4] ^[5] ^[6] ^[7] ^[8] ^[9] ^[10]

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

Arabidopsis Toc33 (atToc33) is a GTPase and a member of the Toc (translocon at the outer-envelope membrane of chloroplasts) complex that associates with precursor proteins during protein import into chloroplasts. By inference from the crystal structure of psToc34, a homologue in pea, the arginine at residue 130 (Arg(130)) has been implicated in the formation of the atToc33 dimer and in intermolecular GTPase activation within the dimer. Here we report the crystal structure at 3.2-A resolution of an atToc33 mutant, atToc33(R130A), in which Arg(130) was mutated to alanine. Both in solution and in crystals, atToc33(R130A) was present in its monomeric form. In contrast, both wild-type atToc33 and another pea Toc GTPase homologue, pea Toc159 (psToc159), were able to form dimers in solution. Dimeric atToc33 and psToc159 had significantly higher GTPase activity than monomeric atToc33, psToc159, and atToc33(R130A). Molecular modeling using the structures of psToc34 and atToc33(R130A) suggests that, in an architectural dimer of atToc33, Arg(130) from one monomer interacts with the beta-phosphate of GDP and several other amino acids of the other monomer. These results indicate that Arg(130) is critical for dimer formation, which is itself important for GTPase activity. Activation of GTPase activity by dimer formation is likely to be a critical regulatory step in protein import into chloroplasts.

Dimerization is important for the GTPase activity of chloroplast translocon components atToc33 and psToc159.,Yeh YH, Kesavulu MM, Li HM, Wu SZ, Sun YJ, Konozy EH, Hsiao CD J Biol Chem. 2007 May 4;282(18):13845-53. Epub 2007 Mar 1. PMID:17337454^[11]

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

References

↑ Yu TS, Li H. Chloroplast protein translocon components atToc159 and atToc33 are not essential for chloroplast biogenesis in guard cells and root cells. Plant Physiol. 2001 Sep;127(1):90-6. PMID:11553737
↑ Jelic M, Soll J, Schleiff E. Two Toc34 homologues with different properties. Biochemistry. 2003 May 20;42(19):5906-16. PMID:12741849 doi:http://dx.doi.org/10.1021/bi034001q
↑ Aronsson H, Combe J, Jarvis P. Unusual nucleotide-binding properties of the chloroplast protein import receptor, atToc33. FEBS Lett. 2003 Jun 5;544(1-3):79-85. PMID:12782294
↑ Weibel P, Hiltbrunner A, Brand L, Kessler F. Dimerization of Toc-GTPases at the chloroplast protein import machinery. J Biol Chem. 2003 Sep 26;278(39):37321-9. Epub 2003 Jul 16. PMID:12869544 doi:http://dx.doi.org/10.1074/jbc.M305946200
↑ Wallas TR, Smith MD, Sanchez-Nieto S, Schnell DJ. The roles of toc34 and toc75 in targeting the toc159 preprotein receptor to chloroplasts. J Biol Chem. 2003 Nov 7;278(45):44289-97. Epub 2003 Sep 1. PMID:12951325 doi:http://dx.doi.org/10.1074/jbc.M307873200
↑ Kubis S, Baldwin A, Patel R, Razzaq A, Dupree P, Lilley K, Kurth J, Leister D, Jarvis P. The Arabidopsis ppi1 mutant is specifically defective in the expression, chloroplast import, and accumulation of photosynthetic proteins. Plant Cell. 2003 Aug;15(8):1859-71. PMID:12897258
↑ Constan D, Patel R, Keegstra K, Jarvis P. An outer envelope membrane component of the plastid protein import apparatus plays an essential role in Arabidopsis. Plant J. 2004 Apr;38(1):93-106. PMID:15053763 doi:http://dx.doi.org/10.1111/j.1365-313X.2004.02024.x
↑ Aronsson H, Combe J, Patel R, Jarvis P. In vivo assessment of the significance of phosphorylation of the Arabidopsis chloroplast protein import receptor, atToc33. FEBS Lett. 2006 Jan 23;580(2):649-55. Epub 2005 Dec 28. PMID:16412428 doi:http://dx.doi.org/S0014-5793(05)01538-3
↑ Hust B, Gutensohn M. Deletion of core components of the plastid protein import machinery causes differential arrest of embryo development in Arabidopsis thaliana. Plant Biol (Stuttg). 2006 Jan;8(1):18-30. PMID:16435266 doi:http://dx.doi.org/10.1055/s-2005-873044
↑ Oreb M, Zoryan M, Vojta A, Maier UG, Eichacker LA, Schleiff E. Phospho-mimicry mutant of atToc33 affects early development of Arabidopsis thaliana. FEBS Lett. 2007 Dec 22;581(30):5945-51. Epub 2007 Dec 3. PMID:18054337 doi:http://dx.doi.org/S0014-5793(07)01225-2
↑ Yeh YH, Kesavulu MM, Li HM, Wu SZ, Sun YJ, Konozy EH, Hsiao CD. Dimerization is important for the GTPase activity of chloroplast translocon components atToc33 and psToc159. J Biol Chem. 2007 May 4;282(18):13845-53. Epub 2007 Mar 1. PMID:17337454 doi:10.1074/jbc.M608385200

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2j3e"

@@ Line 4: / Line 4: @@
 <table><tr><td colspan='2'>[[2j3e]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Arath Arath]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2J3E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2J3E FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=2j3e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2j3e OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2j3e RCSB], [http://www.ebi.ac.uk/pdbsum/2j3e PDBsum]</span></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=2j3e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2j3e OCA], [http://pdbe.org/2j3e PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2j3e RCSB], [http://www.ebi.ac.uk/pdbsum/2j3e PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 26: / Line 26: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2j3e" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

2j3e

From Proteopedia

Revision as of 23:42, 11 September 2015

Dimerization is important for the GTPase activity of chloroplast translocon components atToc33 and psToc159

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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