2oan

From Proteopedia

(Difference between revisions)

Revision as of 08:55, 18 October 2017

Structure of oxidized beta-actin

Structural highlights

2oan is a 4 chain structure with sequence from Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, ,
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ACTB_BOVIN] Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells.

Publication Abstract from PubMed

An essential consequence of growth factor-mediated signal transduction is the generation of intracellular H(2)O(2). It operates as a second messenger in the control of actin microfilament dynamics, causing rapid and dramatic changes in the morphology and motile activity of stimulated cells. Little is understood about the molecular mechanisms causing these changes in the actin system. Here, it is shown that H(2)O(2) acts directly upon several levels of this system, and some of the mechanistic effects are detailed. We describe the impact of oxidation on the polymerizability of non-muscle beta/gamma-actin and compare with that of muscle alpha-actin. Oxidation of beta/gamma-actin can cause a complete loss of polymerizability, crucially, reversible by the thioredoxin system. Further, oxidation of the actin impedes its interaction with profilin and causes depolymerization of filamentous actin. The effects of oxidation are critically dependent on the nucleotide state and the concentration of Ca(2+). We have determined the crystal structure of oxidized beta-actin to a resolution of 2.6 A. The arrangement in the crystal implies an antiparallel homodimer connected by an intermolecular disulfide bond involving cysteine 374. Our data indicate that this dimer forms under non-polymerizing and oxidizing conditions. We identify oxidation of cysteine 272 in the crystallized actin dimer, likely to a cysteine sulfinic acid. In beta/gamma-actin, this is the cysteine residue most reactive towards H(2)O(2) in solution, and we suggest plausible structural determinants for its reactivity. No other oxidative modification was obvious in the structure, highlighting the specificity of the oxidation by H(2)O(2). Possible consequences of the observed effects in a cellular context and their potential relevance are discussed.

Molecular and structural basis for redox regulation of beta-actin.,Lassing I, Schmitzberger F, Bjornstedt M, Holmgren A, Nordlund P, Schutt CE, Lindberg U J Mol Biol. 2007 Jul 6;370(2):331-48. Epub 2007 May 4. PMID:17521670^[1]

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

References

↑ Lassing I, Schmitzberger F, Bjornstedt M, Holmgren A, Nordlund P, Schutt CE, Lindberg U. Molecular and structural basis for redox regulation of beta-actin. J Mol Biol. 2007 Jul 6;370(2):331-48. Epub 2007 May 4. PMID:17521670 doi:S0022-2836(07)00555-4

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

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

@@ Line 1: / Line 1: @@
 ==Structure of oxidized beta-actin==
 <StructureSection load='2oan' size='340' side='right' caption='[[2oan]], [[Resolution|resolution]] 2.61&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2oan]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OAN OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2OAN FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2oan]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OAN OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2OAN FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CSD:3-SULFINOALANINE'>CSD</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=2oan FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2oan OCA], [http://pdbe.org/2oan PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2oan RCSB], [http://www.ebi.ac.uk/pdbsum/2oan 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=2oan FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2oan OCA], [http://pdbe.org/2oan PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2oan RCSB], [http://www.ebi.ac.uk/pdbsum/2oan PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2oan ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 </div>
 <div class="pdbe-citations 2oan" style="background-color:#fffaf0;"></div>
-==See Also==
-*[[Actin|Actin]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Bos taurus]]
+[[Category: Bovin]]
 [[Category: Lassing, I]]
 [[Category: Lindberg, U]]

2oan

From Proteopedia

Revision as of 08:55, 18 October 2017

Structure of oxidized beta-actin

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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