Structural 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: 10.1021/bi200809p
- PubMed Abstract:
- Combining functional and structural genomics to sample the essential Burkholderia structome.
Baugh, L.,Gallagher, L.A.,Patrapuvich, R.,Clifton, M.C.,Gardberg, A.S.,Edwards, T.E.,Armour, B.,Begley, D.W.,Dieterich, S.H.,Dranow, D.M.,Abendroth, J.,Fairman, J.W.,Fox, D.,Staker, B.L.,Phan, I.,Gillespie, A.,Choi, R.,Nakazawa-Hewitt, S.,Nguyen, M.T.,Napuli, A.,Barrett, L.,Buchko, G.W.,Stacy, R.,Myler, P.J.,Stewart, L.J.,Manoil, C.,Van Voorhis, W.C.
(2013) Plos One 8: e53851
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 c ...
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.
Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada.