Crystal structure of Staphylococcus aureus Zn-glyoxalase I: new subfamily of glyoxalase I family.Chirgadze, Y.N., Boshkova, E.A., Battaile, K.P., Mendes, V.G., Lam, R., Chan, T.S.Y., Romanov, V., Pai, E.F., Chirgadze, N.Y.
(2018) J Biomol Struct Dyn 36: 376-386
- PubMed: 28034013
- DOI: https://doi.org/10.1080/07391102.2016.1278038
- Primary Citation of Related Structures:
- PubMed Abstract:
The crystal structures of protein SA0856 from Staphylococcus aureus in its apo-form and in complex with a Zn 2+ -ion have been presented. The 152 amino acid protein consists of two similar domains with α + β topology. In both crystalline state and in solution, the protein forms a dimer with monomers related by a twofold pseudo-symmetry rotation axis. A sequence homology search identified the protein as a member of the structural family Glyoxalase I. We have shown that the enzyme possesses glyoxalase I activity in the presence of Zn 2+ , Mg 2+ , Ni 2+ , and Co 2+ , in this order of preference. Sequence and structure comparisons revealed that human glyoxalase I should be assigned to a subfamily A, while S. aureus glyoxalase I represents a new subfamily B, which includes also proteins from other bacteria. Both subfamilies have a similar protein chain fold but rather diverse sequences. The active sites of human and staphylococcus glyoxalases I are also different: the former contains one Zn-ion per chain; the latter incorporates two of these ions. In the active site of SA0856, the first Zn-ion is well coordinated by His58, Glu60 from basic molecule and Glu40*, His44* from adjacent symmetry-related molecule. The second Zn3-ion is coordinated only by residue His143 from protein molecule and one acetate ion. We suggest that only single Zn1-ion plays the role of catalytic center. The newly found differences between the two subfamilies could guide the design of new drugs against S. aureus, an important pathogenic micro-organism.
c Department of Biochemistry , University of Cambridge , Cambridge CB2 1GA , UK.