1t4b: Difference between revisions

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[[Image:1t4b.jpg|left|200px]]
{{Seed}}
[[Image:1t4b.png|left|200px]]


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{{STRUCTURE_1t4b|  PDB=1t4b  |  SCENE=  }}  
{{STRUCTURE_1t4b|  PDB=1t4b  |  SCENE=  }}  


'''1.6 Angstrom structure of Esherichia coli aspartate-semialdehyde dehydrogenase.'''
===1.6 Angstrom structure of Esherichia coli aspartate-semialdehyde dehydrogenase.===




==Overview==
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Two high-resolution structures have been determined for Eschericia coli aspartate beta-semialdehyde dehydrogenase (ecASADH), an enzyme of the aspartate biosynthetic pathway, which is a potential target for novel antimicrobial drugs. Both ASADH structures were of the open form and were refined to 1.95 A and 1.6 A resolution, allowing a more detailed comparison with the closed form of the enzyme than previously possible. A more complex scheme for domain closure is apparent with the subunit being split into two further sub-domains with relative motions about three hinge axes. Analysis of hinge data and torsion-angle difference plots is combined to allow the proposal of a detailed structural mechanism for ecASADH domain closure. Additionally, asymmetric distortions of individual subunits are identified, which form the basis for the previously reported "half-of-the-sites reactivity" (HOSR). A putative explanation of this arrangement is also presented, suggesting the HOSR system may provide a means for ecASADH to offset the energy required to remobilise flexible loops at the end of the reaction cycle, and hence avoid falling into an energy minimum.
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{{ABSTRACT_PUBMED_15288787}}


==About this Structure==
==About this Structure==
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[[Category: Hosr]]
[[Category: Hosr]]
[[Category: Lysine biosynthesis]]
[[Category: Lysine biosynthesis]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 09:30:29 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:06:24 2008''

Revision as of 04:06, 29 July 2008

File:1t4b.png

Template:STRUCTURE 1t4b

1.6 Angstrom structure of Esherichia coli aspartate-semialdehyde dehydrogenase.

Template:ABSTRACT PUBMED 15288787

About this Structure

1T4B is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

High-resolution structures reveal details of domain closure and "half-of-sites-reactivity" in Escherichia coli aspartate beta-semialdehyde dehydrogenase., Nichols CE, Dhaliwal B, Lockyer M, Hawkins AR, Stammers DK, J Mol Biol. 2004 Aug 13;341(3):797-806. PMID:15288787

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