1a2j
From Proteopedia
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| - | [[Image:1a2j.jpg|left|200px]]<br /><applet load="1a2j" size=" | + | [[Image:1a2j.jpg|left|200px]]<br /><applet load="1a2j" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1a2j, resolution 2.0Å" /> | caption="1a2j, resolution 2.0Å" /> | ||
'''OXIDIZED DSBA CRYSTAL FORM II'''<br /> | '''OXIDIZED DSBA CRYSTAL FORM II'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1A2J is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Known structural/functional Site: <scene name='pdbsite=CAA:The Active Site'>CAA</scene>. Full crystallographic information is available from [http:// | + | 1A2J is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Known structural/functional Site: <scene name='pdbsite=CAA:The+Active+Site'>CAA</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1A2J OCA]. |
==Reference== | ==Reference== | ||
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[[Category: redox-active center]] | [[Category: redox-active center]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Feb 3 09:28:43 2008'' |
Revision as of 07:28, 3 February 2008
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OXIDIZED DSBA CRYSTAL FORM II
Overview
BACKGROUND: The redox proteins that incorporate a thioredoxin fold have, diverse properties and functions. The bacterial protein-folding factor, DsbA is the most oxidizing of the thioredoxin family. DsbA catalyzes, disulfide-bond formation during the folding of secreted proteins. The, extremely oxidizing nature of DsbA has been proposed to result from either, domain motion or stabilizing active-site interactions in the reduced form., In the domain motion model, hinge bending between the two domains of DsbA, occurs as a result of redox-related conformational changes. RESULTS: We, have determined the crystal structures of reduced and oxidized DsbA in the, same crystal form and at the same pH (5.6). The crystal structure of a, lower pH form of oxidized DsbA has also been determined (pH 5.0). These, new crystal structures of DsbA, and the previously determined structure of, oxidized DsbA at pH 6.5, provide the foundation for analysis of structural, changes that occur upon reduction of the active-site disulfide bond., CONCLUSIONS: The structures of reduced and oxidized DsbA reveal that hinge, bending motions do occur between the two domains. These motions are, independent of redox state, however, and therefore do not contribute to, the energetic differences between the two redox states. Instead, the, observed domain motion is proposed to be a consequence of substrate, binding. Furthermore, DsbA's highly oxidizing nature is a result of, hydrogen bond, electrostatic and helix-dipole interactions that favour the, thiolate over the disulfide at the active site.
About this Structure
1A2J is a Single protein structure of sequence from Escherichia coli. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Crystal structures of reduced and oxidized DsbA: investigation of domain motion and thiolate stabilization., Guddat LW, Bardwell JC, Martin JL, Structure. 1998 Jun 15;6(6):757-67. PMID:9655827
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