Structural highlights
1t4b is a 2 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Ligands: | |
| Related: | 1t4d |
| Gene: | ASD, HOM, B3433, Z4797, ECS4278, SF3456, S4307 ("Bacillus coli" Migula 1895) |
| Activity: | Aspartate-semialdehyde dehydrogenase, with EC number 1.2.1.11 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[DHAS_ECOLI] Catalyzes the NADPH-dependent formation of L-aspartate-semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl-4-phosphate.[1] [2]
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
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.
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[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Biellmann JF, Eid P, Hirth C, Jornvall H. Aspartate-beta-semialdehyde dehydrogenase from Escherichia coli. Purification and general properties. Eur J Biochem. 1980 Feb;104(1):53-8. PMID:6102909
- ↑ Chassagnole C, Rais B, Quentin E, Fell DA, Mazat JP. An integrated study of threonine-pathway enzyme kinetics in Escherichia coli. Biochem J. 2001 Jun 1;356(Pt 2):415-23. PMID:11368768
- ↑ Nichols CE, Dhaliwal B, Lockyer M, Hawkins AR, Stammers DK. High-resolution structures reveal details of domain closure and "half-of-sites-reactivity" in Escherichia coli aspartate beta-semialdehyde dehydrogenase. J Mol Biol. 2004 Aug 13;341(3):797-806. PMID:15288787 doi:http://dx.doi.org/10.1016/j.jmb.2004.05.073
