Download MendeleyStructure of the branched-chain aminotransferase from Streptococcus mutans
Ruan, J., Hu, J., Yin, A.H., Wu, W.Q., Cong, X.Z., Feng, X.T., Li, S.T.(2012) Acta Crystallogr D Biol Crystallogr 68: 996-1002
- PubMed: 22868765
- DOI: https://doi.org/10.1107/S0907444912018446
- Primary Citation of Related Structures:
4DQN - PubMed Abstract:
The branched-chain amino-acid aminotransferase from Streptococcus mutans (SmIlvE) was recombinantly expressed in Escherichia coli with high yield. An effective purification protocol was established. A bioactivity assay indicated that SmIlvE had aminotransferase activity. The specific activity of SmIlvE towards amino-acid substrates was found to be as follows (in descending order): Ile > Leu > Val > Trp > Gly. The protein was crystallized using the hanging-drop vapour-diffusion method with PEG 3350 as the primary precipitant. The structure of SmIlvE was solved at 1.97 Å resolution by the molecular-replacement method. Comparison with structures of homologous proteins enabled the identification of conserved structural elements that might play a role in substrate binding. Further work is needed to confirm the interaction between SmIlvE and its substrates by determining the structures of their complexes.
Organizational Affiliation:
Department of Immunology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, People's Republic of China.
