Download MendeleyStructural basis of the substrate specificity of bifunctional isocitrate dehydrogenase kinase/phosphatase.
Yates, S.P., Edwards, T.E., Bryan, C.M., Stein, A.J., Van Voorhis, W.C., Myler, P.J., Stewart, L.J., Zheng, J., Jia, Z.(2011) Biochemistry 50: 8103-8106
- PubMed: 21870819
- DOI: https://doi.org/10.1021/bi200809p
- Primary Citation of Related Structures:
3DMS - PubMed Abstract:
Isocitrate dehydrogenase kinase/phosphatase (AceK) regulates entry into the glyoxylate bypass by reversibly phosphorylating isocitrate dehydrogenase (ICDH). On the basis of the recently determined structure of the AceK-ICDH complex from Escherichia coli, we have classified the structures of homodimeric NADP(+)-ICDHs to rationalize and predict which organisms likely contain substrates for AceK. One example is Burkholderia pseudomallei (Bp). Here we report a crystal structure of Bp-ICDH that exhibits the necessary structural elements required for AceK recognition. Kinetic analyses provided further confirmation that Bp-ICDH is a substrate for AceK. We conclude that the highly stringent AceK binding sites on ICDH are maintained only in Gram-negative bacteria.
Organizational Affiliation:
Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada.
