期刊
INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY
卷 150, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ibmb.2022.103849
关键词
Mevalonate pathway; Phosphomevalonate kinase; Crystal structure; Enzymatic activity; JH biosynthesis
资金
- National Natural Science Foundation of China
- Natural Science Foundation of Chongqing, China
- Venture and Innovation Support Program for Chongqing Overseas Returnees
- [31970468]
- [32030103]
- [cstc2020jcyj-cxttX0001]
- [cx2020100]
The crystal structure of insect PMK from Bombyx mori (BmPMK) has been reported, revealing its binding mode with cofactors and substrates. The optimal enzyme activity of BmPMK was determined, along with its key role in JH biosynthesis in silkworms.
Phosphomevalonate kinase (PMK) is an important enzyme involved in the juvenile hormone (JH) biosynthesis pathway that catalyzes the phosphorylation of mevalonate 5-phosphate into mevalonate 5-diphosphate in the mevalonate pathway. Herein, we report the crystal structure of insect PMK from Bombyx mori (BmPMK) at a resolution of 1.60 angstrom. The overall structure of BmPMK adopts a compact alpha/beta conformation with two parts: the core and lid regions. The interface between the core and lid regions forms a continuous and negatively charged groove to accommodate the substrates. Using computational simulation combined with site-directed mutagenesis and biochemical analysis, we define the binding mode of BmPMK with the cofactor and the substrate, which provides a structural basis for understanding the catalytic mechanism and the design of inhibitors of PMK. Moreover, BmPMK showed the optimal enzyme activity at pH 8.0, and the optimal temperature was 30 degrees C, using mevalonate 5-phosphate as the substrate. The expression profiles and kinetic analyses of BmPMK indicated that it plays critical role in the control of JH biosynthesis in silkworms. Collectively, these findings provide a better understanding of the structural and biochemical features of insect PMK.
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