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Heterogenous expression of Synechocystis sp. PCC 6803 deg proteases and their possible roles on phycobiliprotein degradation in vitro

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Abstract

The Synechocystis sp. PCC 6803 genome harbours a Deg gene family consisting of three members, htrA (degP, slr1204), hhoA (degQ, sll1679) and hhoB (degS, sll1427). This work provided biochemical characterization of HhoA, HtrA and HhoB from Synechocystis sp. PCC 6803. Firstly mature HhoA, HhoB and HtrA from Synechocystis sp. PCC 6803 were cloned and expressed as soluble recombinant his-tagged fusion protein in Escherichia coli. Then the proteolytic activity of HhoA, HhoB and HtrA was tested using casein, bovine serum albumin, five recombinant chromoproteins and cyanobacterial phycocyanin as substrates in vitro. The experimental results showed that HhoA and HtrA had proteolytic activity on casein, five recombinant chromoproteins and cyanobacterial phycocyanin. No proteolytic activity of HhoB was found using all substrates in vitro, indicating functional difference among Deg proteases from Synechocystis sp. PCC 6803. Therefore, the results indicated the biochemical properties of HhoA and HtrA on hydrolysis of proteins and phycobiliproteins in vitro, which implicated that they were proteases possibly involved in phycobiliprotein degradation in vivo.

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Authors and Affiliations

  1. School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China

    Hongli Diao  (刁红丽)

  2. School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Hongli Diao  (刁红丽) & Ting Zhou

  3. State Key Laboratory of Agricultural Microbiology, Huazhong Agriculture University, Wuhan, 430070, China

    Juang Zhang, Kaihong Zhao & Ming Zhou  (周明)

  4. Institute of Sciences, Wuhan University of Technology, Wuhan, 430070, China

    Cheng Yang

Authors
  1. Hongli Diao  (刁红丽)
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  2. Ting Zhou
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  3. Juang Zhang
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  4. Kaihong Zhao
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  5. Ming Zhou  (周明)
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  6. Cheng Yang
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Correspondence to Ming Zhou  (周明).

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Funded by the National Natural Science Foundation of China (Nos.30870541, 30870519)

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Diao, H., Zhou, T., Zhang, J. et al. Heterogenous expression of Synechocystis sp. PCC 6803 deg proteases and their possible roles on phycobiliprotein degradation in vitro . J. Wuhan Univ. Technol.-Mat. Sci. Edit. 26, 1049–1058 (2011). https://doi.org/10.1007/s11595-011-0361-7

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  • DOI: https://doi.org/10.1007/s11595-011-0361-7

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