SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (1): 101-108.DOI: 10.1016/j.cjche.2015.08.020

• 第25届中国过程控制会议专栏 • 上一篇    下一篇

Imaging protein crystal growth behaviour in batch cooling crystallisation

Jing J. Liu1,2, Cai Y.Ma2, Xue Z. Wang1,2   

  1. 1 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
    2 Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
  • 收稿日期:2014-11-22 修回日期:2015-05-03 出版日期:2016-01-28 发布日期:2016-02-23
  • 通讯作者: Xue Z. Wang
  • 基金资助:

    Supported by the China One Thousand Talent Scheme, the National Natural Science Foundation of China under its Major Research Scheme of Meso-scale Mechanism and Control in Multi-phase Reaction Processes (91434126), the Natural Science Foundation of Guangdong Province (2014A030313228), and also benefited from early work funded byUKEngineering and Physical Science Research Council (EP/H008012/1, EP/H008853/1).

Imaging protein crystal growth behaviour in batch cooling crystallisation

Jing J. Liu1,2, Cai Y.Ma2, Xue Z. Wang1,2   

  1. 1 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
    2 Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
  • Received:2014-11-22 Revised:2015-05-03 Online:2016-01-28 Published:2016-02-23
  • Contact: Xue Z. Wang
  • Supported by:

    Supported by the China One Thousand Talent Scheme, the National Natural Science Foundation of China under its Major Research Scheme of Meso-scale Mechanism and Control in Multi-phase Reaction Processes (91434126), the Natural Science Foundation of Guangdong Province (2014A030313228), and also benefited from early work funded byUKEngineering and Physical Science Research Council (EP/H008012/1, EP/H008853/1).

摘要: The temporal and spatial growth behaviour of protein crystals, subject to different cooling strategies in protein crystallisation was investigated. Although the impact of temperature and cooling rate on crystal growth of small moleculeswaswell documented, much less has been reported on their impact on the crystallisation of proteins. In this paper, an experimental set-up is configured to carry out such a study which involves an automatic temperature controlled hot-stage crystalliser fittedwith a real-time imaging system. Linbro parallel crystallisation experiments (24-well plate)were also conducted to find the suitable initial conditions to be used in the hot-stage crystallisation experiments, including the initial concentration of HEWlysozyme solutions, precipitate concentration and pH value. It was observed that fast cooling rates at the early stage led to precipitates while slow cooling rates produced crystal nuclei, and very slowcooling rates,much smaller than for smallmolecules are critical to the growth of the nuclei and the crystals to a desired shape. The interesting results provide valuable insight aswell as experimental proof of the feasibility and effectiveness of cooling as a means for achieving controlled protein crystallisation, compared with the evaporation approach which was widely used to grow single large crystals for X-ray diffraction study. Since cooling rate control can be easily achieved and has good repeatability, it suggests that large-scale production of protein crystals can be effectively achieved by manipulating cooling rates.

关键词: Hot-stage reactor, On-line imaging of crystal growth, Hen-Egg-White lysozyme cooling, crystallisation, Protein crystallisation, Real-time in-process imaging

Abstract: The temporal and spatial growth behaviour of protein crystals, subject to different cooling strategies in protein crystallisation was investigated. Although the impact of temperature and cooling rate on crystal growth of small moleculeswaswell documented, much less has been reported on their impact on the crystallisation of proteins. In this paper, an experimental set-up is configured to carry out such a study which involves an automatic temperature controlled hot-stage crystalliser fittedwith a real-time imaging system. Linbro parallel crystallisation experiments (24-well plate)were also conducted to find the suitable initial conditions to be used in the hot-stage crystallisation experiments, including the initial concentration of HEWlysozyme solutions, precipitate concentration and pH value. It was observed that fast cooling rates at the early stage led to precipitates while slow cooling rates produced crystal nuclei, and very slowcooling rates,much smaller than for smallmolecules are critical to the growth of the nuclei and the crystals to a desired shape. The interesting results provide valuable insight aswell as experimental proof of the feasibility and effectiveness of cooling as a means for achieving controlled protein crystallisation, compared with the evaporation approach which was widely used to grow single large crystals for X-ray diffraction study. Since cooling rate control can be easily achieved and has good repeatability, it suggests that large-scale production of protein crystals can be effectively achieved by manipulating cooling rates.

Key words: Hot-stage reactor, On-line imaging of crystal growth, Hen-Egg-White lysozyme cooling, crystallisation, Protein crystallisation, Real-time in-process imaging