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4tum

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Current revision

Crystal structure of Ankyrin Repeat Domain of AKR2

Structural highlights

4tum is a 5 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.3Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

AKR2A_ARATH Exhibits chaperone activity toward chloroplast outer envelope membrane, mitochondrion outer membrane, endoplasmic reticulum membrane and peroxisomal proteins, by recruiting specific proteins containing a single transmembrane associated with an AKR2A-binding sequence (ABS) and subsequently binding glycolipids (e.g. monogalactosyldiacylglycerol (MGDG) and phosphatidylglycerol (PG)) present in the membrane of the target organelle (PubMed:18193034, PubMed:20215589, PubMed:25203210). Seems to be involved in the regulation of hydrogen peroxide levels during biotic and abiotic stresses by optimizing the ascorbate peroxidase 3 (APX3) hydrogen peroxide-degrading activity. This regulation might be monitored by GRF6. Cytosolic targeting factor for chloroplast outer membrane (COM) proteins that mediates sorting and targeting of nascent chloroplast outer envelope membrane (OEM) proteins to the chloroplast. Facilitates the targeting of OEP7 to chloroplasts (PubMed:18193034). Facilitates the targeting of APX3 to peroxisomes. Involved in cellular metabolism (e.g. peroxisome activity) and required for plant growth and development (PubMed:20215589).^[1] ^[2] ^[3] ^[4]

Publication Abstract from PubMed

In organellogenesis of the chloroplast from endosymbiotic cyanobacteria, the establishment of protein-targeting mechanisms to the chloroplast should have been pivotal. However, it is still mysterious how these mechanisms were established and how they work in plant cells. Here we show that AKR2A, the cytosolic targeting factor for chloroplast outer membrane (COM) proteins, evolved from the ankyrin repeat domain (ARD) of the host cell by stepwise extensions of its N-terminal domain and that two lipids, monogalactosyldiacylglycerol (MGDG) and phosphatidylglycerol (PG), of the endosymbiont were selected to function as the AKR2A receptor. Structural analysis, molecular modeling, and mutational analysis of the ARD identified two adjacent sites for coincidental and synergistic binding of MGDG and PG. Based on these findings, we propose that the targeting mechanism of COM proteins was established using components from both the endosymbiont and host cell through a modification of the protein-protein-interacting ARD into a lipid binding domain.

An Ankyrin Repeat Domain of AKR2 Drives Chloroplast Targeting through Coincident Binding of Two Chloroplast Lipids.,Kim DH, Park MJ, Gwon GH, Silkov A, Xu ZY, Yang EC, Song S, Song K, Kim Y, Yoon HS, Honig B, Cho W, Cho Y, Hwang I Dev Cell. 2014 Sep 8;30(5):598-609. doi: 10.1016/j.devcel.2014.07.026. PMID:25203210^[5]

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

References

↑ Yan J, Wang J, Zhang H. An ankyrin repeat-containing protein plays a role in both disease resistance and antioxidation metabolism. Plant J. 2002 Jan;29(2):193-202. PMID:11862948 doi:10.1046/j.0960-7412.2001.01205.x
↑ Bae W, Lee YJ, Kim DH, Lee J, Kim S, Sohn EJ, Hwang I. AKR2A-mediated import of chloroplast outer membrane proteins is essential for chloroplast biogenesis. Nat Cell Biol. 2008 Feb;10(2):220-7. PMID:18193034 doi:10.1038/ncb1683
↑ Shen G, Kuppu S, Venkataramani S, Wang J, Yan J, Qiu X, Zhang H. ANKYRIN REPEAT-CONTAINING PROTEIN 2A is an essential molecular chaperone for peroxisomal membrane-bound ASCORBATE PEROXIDASE3 in Arabidopsis. Plant Cell. 2010 Mar;22(3):811-31. PMID:20215589 doi:10.1105/tpc.109.065979
↑ Kim DH, Park MJ, Gwon GH, Silkov A, Xu ZY, Yang EC, Song S, Song K, Kim Y, Yoon HS, Honig B, Cho W, Cho Y, Hwang I. An Ankyrin Repeat Domain of AKR2 Drives Chloroplast Targeting through Coincident Binding of Two Chloroplast Lipids. Dev Cell. 2014 Sep 8;30(5):598-609. doi: 10.1016/j.devcel.2014.07.026. PMID:25203210 doi:http://dx.doi.org/10.1016/j.devcel.2014.07.026
↑ Kim DH, Park MJ, Gwon GH, Silkov A, Xu ZY, Yang EC, Song S, Song K, Kim Y, Yoon HS, Honig B, Cho W, Cho Y, Hwang I. An Ankyrin Repeat Domain of AKR2 Drives Chloroplast Targeting through Coincident Binding of Two Chloroplast Lipids. Dev Cell. 2014 Sep 8;30(5):598-609. doi: 10.1016/j.devcel.2014.07.026. PMID:25203210 doi:http://dx.doi.org/10.1016/j.devcel.2014.07.026

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4tum"

Categories: Arabidopsis thaliana | Large Structures | Cho Y | Gwon GH

@@ Line 4: / Line 4: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[4tum]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4TUM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4TUM FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4tum FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4tum OCA], [https://pdbe.org/4tum PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4tum RCSB], [https://www.ebi.ac.uk/pdbsum/4tum PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4tum ProSAT]</span></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3&#8491;</td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4tum FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4tum OCA], [https://pdbe.org/4tum PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4tum RCSB], [https://www.ebi.ac.uk/pdbsum/4tum PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4tum ProSAT]</span></td></tr>
 </table>
 == Function ==

4tum

From Proteopedia

Current revision

Crystal structure of Ankyrin Repeat Domain of AKR2

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

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