Correlation of structure and function in the human hotdog-fold enzyme hTHEM4.Zhao, H., Lim, K., Choudry, A., Latham, J.A., Pathak, M.C., Dominguez, D., Luo, L., Herzberg, O., Dunaway-Mariano, D.
(2012) Biochemistry 51: 6490-6492
- PubMed: 22871024
- DOI: https://doi.org/10.1021/bi300968n
- Primary Citation of Related Structures:
- PubMed Abstract:
Human THEM4 (hTHEM4) is comprised of a catalytically active hotdog-fold acyl-CoA thioesterase domain and an N-terminal domain of unknown fold and function. hTHEM4 has been linked to Akt1 regulation and cell apoptosis. Herein, we report the X-ray structure of hHTEM4 bound with undecan-2-one-CoA. Structure guided mutagenesis was carried out to confirm the catalytic residues. The N-terminal domain is shown to be partially comprised of irregular and flexible secondary structure, reminiscent of a protein-binding domain. We demonstrate direct hTHEM4-Akt1 binding by immunoprecipitation and by inhibition of Akt1 kinase activity, thus providing independent evidence that hTHEM4 is an Akt1 negative regulator.
Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA.