Journal
PROTEIN EXPRESSION AND PURIFICATION
Volume 165, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pep.2019.105483
Keywords
Cell cycle proteins; Cyclin-dependent kinase; Zea mays L.; Cyclin D6; 1; Circular dichroism spectroscopy
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Funding
- Universidad de Buenos Aires (UBACYT)
- Consejo Nacional de Investigaciones Cientificas y Tecnicas
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The complex formed by the cyclin-dependent kinase A (CDKA) and cyclin D is responsible for the G1-S transition in the plant cell cycle. Maize (Zea mays L) CDKA; 1 and CycD6; 1 were cloned and expressed in E. coli. The present study describes the optimization of both proteins production using a statistical approach known as response surface methodology (RSM). The experimental design took into account the effects of four variables: optical density of the culture (OD600) before induction, isopropyl beta-D-1-thiogalactopyranoside (IPTG) concentration, post-induction temperature, and post-induction time. For each protein, a 2(4) full factorial central composite rotary design for these four independent variables (at five levels each) was employed to fit a polynomial model; which indicated that 30 experiments were required for this procedure. An optimization of CDKA; 1 and CycD6; 1 production levels in the soluble fraction was achieved. Protein conformation and stability were studied by circular dichroism and fluorescence spectroscopy. Finally, in vitro Cyc-CDK complex formation and its kinase activity were confirmed.
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