Download MendeleyThe X-Ray Structure of Yeast 5-Aminolaevulinic Acid Dehydratase Complexed with Two Diacid Inhibitors
Erskine, P.T., Coates, L., Newbold, R., Brindley, A.A., Stauffer, F., Wood, S.P., Warren, M.J., Cooper, J.B., Shoolingin-Jordan, P.M., Neier, R.(2001) FEBS Lett 503: 196
- PubMed: 11513881
- DOI: https://doi.org/10.1016/s0014-5793(01)02721-1
- Primary Citation of Related Structures:
1EB3, 1GJP - PubMed Abstract:
The structures of 5-aminolaevulinic acid dehydratase complexed with two irreversible inhibitors (4-oxosebacic acid and 4,7-dioxosebacic acid) have been solved at high resolution. Both inhibitors bind by forming a Schiff base link with Lys 263 at the active site. Previous inhibitor binding studies have defined the interactions made by only one of the two substrate moieties (P-side substrate) which bind to the enzyme during catalysis. The structures reported here provide an improved definition of the interactions made by both of the substrate molecules (A- and P-side substrates). The most intriguing result is the novel finding that 4,7-dioxosebacic acid forms a second Schiff base with the enzyme involving Lys 210. It has been known for many years that P-side substrate forms a Schiff base (with Lys 263) but until now there has been no evidence that binding of A-side substrate involves formation of a Schiff base with the enzyme. A catalytic mechanism involving substrate linked to the enzyme through Schiff bases at both the A- and P-sites is proposed.
Organizational Affiliation:
Division of Biochemistry and Molecular Biology, School of Biological Sciences, University of Southampton, UK.
