| Literature DB >> 17004708 |
Joby Eldo1, James P Cardia, Elizabeth M O'Day, Jiarong Xia, Hiro Tsuruta, Evan R Kantrowitz.
Abstract
The synthesis of a new inhibitor, N-phosphonacetyl-L-isoasparagine (PALI), of Escherichia coli aspartate transcarbamoylase (ATCase) is reported, as well as structural studies of the enzyme.PALI complex. PALI was synthesized in 7 steps from beta-benzyl L-aspartate. The KD of PALI was 2 microM. Kinetics and small-angle X-ray scattering experiments showed that PALI can induce the cooperative transition of ATCase from the T to the R state. The X-ray structure of the enzyme.PALI complex showed 22 hydrogen-bonding interactions between the enzyme and PALI. The kinetic characterization and crystal structure of the ATCase.PALI complex also provides detailed information regarding the importance of the alpha-carboxylate for the binding of the substrate aspartate.Entities:
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Year: 2006 PMID: 17004708 PMCID: PMC2538380 DOI: 10.1021/jm0607294
Source DB: PubMed Journal: J Med Chem ISSN: 0022-2623 Impact factor: 7.446