L-aspartate-alpha-decarboxylase (ADC) is a critical regulatory enzyme in the pantothenate biosynthetic pathway and belongs to a small class of self-cleaving and pyruvoyl-dependent amino acid decarboxylases. The expression level of ADC in Mycobacterium tuberculosis (Mtb) was confirmed by cDNA analysis, immunoblotting with an anti-ADC polyclonal antibody using whole cell lysate and immunoelectron microscopy ...
L-aspartate-alpha-decarboxylase (ADC) is a critical regulatory enzyme in the pantothenate biosynthetic pathway and belongs to a small class of self-cleaving and pyruvoyl-dependent amino acid decarboxylases. The expression level of ADC in Mycobacterium tuberculosis (Mtb) was confirmed by cDNA analysis, immunoblotting with an anti-ADC polyclonal antibody using whole cell lysate and immunoelectron microscopy. The recombinant ADC proenzyme from Mycobacterium tuberculosis (MtbADC) was overexpressed in E. coli and the protein structure was determined at 2.99 A resolution. The proteins fold into the double-psi beta-barrel structure. The subunits of the two tetramers (there are eight ADC molecules in the asymmetric unit) form pseudo fourfold rotational symmetry, similar to the E. coli ADC proenzyme structure. As pantothenate is synthesized in microorganisms, plants, and fungi but not in animals, structure elucidation of Mtb ADC is of substantial interest for structure-based drug development.
Related Citations:
Crystal Structure of Aspartate Decarboxylase at 2.2A Resolution Provides Evidence for an Ester in Protein Self-Processing Albert, A., Dhanaraj, V., Genschel, U., Khan, G., Ramjee, M.K., Pulido, R., Sibanda, B.L., von Delft, F., Witty, M., Blundell, T.L., Smith, A.G., Abell, C. (1998) Nat Struct Biol 5: 289
Structural Constraints on Protein Self-Processing in L-Aspartate-Alpha-Decarboxylase Schmitzberger, F., Kilkenny, M.L., Lobley, C.M., Webb, M.E., Vinkovic, M., Matak-Vinkovic, D., Witty, M., Chirgadze, D.Y., Smith, A.G., Abell, C., Blundell, T.L. (2003) EMBO J 22: 6193
Crystal Structure of the Schiff Base Intermediate Prior to Decarboxylation in the Catalytic Cycle of Aspartate Alpha-Decarboxylase Lee, B.I., Suh, S.W. (2004) J Mol Biol 340: 1
Organizational Affiliation:
Department of Biological Sciences, National University of Singapore, Singapore 117543.
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