期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 170, 期 -, 页码 390-396出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.12.174
关键词
Bacillus cereus ATCC 14579; Acyl-CoA thioesterase; Nucleotide-independent regulation
资金
- Cooperative Research Program for Agricultural Science & Technology Development [PJ01492602]
- Rural Development Administration, Republic of Korea
In this study, the crystal structure and active site of acyl-CoA thioesterase from Bacillus cereus ATCC 14579 were reported. The findings suggest that BcACT1 may undergo an open-closed conformational change and its catalytic activity can be increased through site-directed mutagenesis.
Acyl-CoA thioesterase is an enzyme that catalyzes the cleavage of thioester bonds and regulates the cellular concentrations of CoASH, fatty acids, and acyl-CoA. In this study, we report the crystal structure of acyl-CoA thioesterase from Bacillus cereus ATCC 14579 (BcACT1) complexed with the CoA product BcACT1 possesses a monomeric structure of a hotdog-fold and forms a hexamer via the tri meriza lion of three dimers. We identified the active site of BcACT1 and revealed that residues Asn23 and Asp38 are crucial for enzyme catalysis, indicating that BcACT1 belongs to the TE6 family. We also propose that BcACT1 might undergo an open-closed conformational change on the acyl-CoA binding pocket upon binding of the acyl-CoA substrate. Interestingly, the BcACT1 variants with dramatically increased activities were obtained during the site-directed mutagenesis experiments to confirm the residues involved in CoA binding. Finally, we found that BcACT1 is not nucleotide-regulated and suggest that the length and shape of the additional alpha 2-helix are crucial in determining a regulation mode by nucleotides. (C) 2020 Elsevier B.V. All rights reserved.
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