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中国生物工程杂志

China Biotechnology
China Biotechnology  2022, Vol. 42 Issue (10): 31-38    DOI: 10.13523/j.cb.2204069
    
Protein Preparation and Activity Identification of Rat Sentrin-specific Protease 1 Catalytic Domain
Li MENG,Cai-ping DU**()
Research Center for Biochemistry and Molecular Biology, Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical University, Xuzhou 221004, China
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Abstract  

Objective: Preparation and enzymatic activity identification of sentrin-specific protease1 (SENP1) catalytic domain (SENP1C). Methods: The target genes were amplified by PCR from SENP1-pcDNA3.1 and EGFP-pcDNA3.1, and then cloned into pGEM-T vector. After enzyme digestion, the digested cDNAs were then subcloned into the prokaryotic expression vector pET-28a. Next, the positive recombinants were transfected into prokaryotic expression cells BL-21, which were then induced by isopropyl thiogalactoside (IPTG). The protein expression was identified by SDS-PAGE and coomassie brilliant blue staining. The extracted proteins were purified by Ni-NTA and dialysis treatment, and the protein purity was further checked by SDS-PAGE and coomassie brilliant blue staining. HT22 cells was pre-incubated with 1 μmol/L or 5 μmol/L Tat-EGFP for different times, and cell transfection was observed by fluorescence microscope. After pretreatment with 5 μmol/L Tat-SENP1 for 10 h, the SUMOylation of overall protein in HT22 cells was detected by immunoblot analysis. In addition, immunoprecipitation and immunoblotting were used to evaluate endogenous and exogenous Akt1-SUMO1 conjugations in HT22 cells or HT22 cells overexpressing Myc-Akt1 and HA-SUMO1. Results: Tat-SENP1C-pET-28a and Tat-EGFP-pET-28a prokaryotic expression recombinants were successfully constructed, which were efficiently induced to express target proteins by IPTG. The high purity target proteins were obtained by Ni-NTA and dialysis. After incubation with 5 μmol/L Tat-EGFP for 10 h, the penetration efficiency was higher in HT22 cells. Tat-SENP1C reduced the levels of total SUMOylation and endogenous and exogenous Akt1-SUMO1 conjugations significantly. Conclusion: Tat-SENP1C-pET-28a and Tat-EGFP-pET-28a prokaryotic expression recombinants were successfully constructed, and can be highly induced to express target proteins by IPTG. The purified Tat-SENP1C retains strong membrane penetration ability and enzymatic activity.



Key wordsSentrin-specific protease 1      Catalytic domain      Prokaryotic expression vector      deSUMOylation      Akt1     
Received: 26 April 2022      Published: 04 November 2022
ZTFLH:  Q786  
Corresponding Authors: Cai-ping DU     E-mail: caipingdu@xzhmu.edu.cn
Cite this article:

Li MENG,Cai-ping DU. Protein Preparation and Activity Identification of Rat Sentrin-specific Protease 1 Catalytic Domain. China Biotechnology, 2022, 42(10): 31-38.

URL:

https://manu60.magtech.com.cn/biotech/10.13523/j.cb.2204069     OR     https://manu60.magtech.com.cn/biotech/Y2022/V42/I10/31

引物名称 引物序列(5'-3') 酶切位点
Tat-SENP1C上游 CCATGGGCTATGGCAGGAAGAAGCGGAGACAGCGACGAAGATCTCGAGCCCGGGAAAGATTG Nco I
Tat-SENP1C下游 GCGGCCGCCAAGAGCTTCCGGTGGAGGAT Not I
Tat-EGFP上游 CCATGGGCTATGGCAGGAAGAAGCGGAGACAGCGACGAAGAATGGTGAGCAAGGGCGAG Nco I
Tat-EGFP下游 GCGGCCGCCTTGTACAGCTCGTCCATG Not I
Table 1 Primers for Tat-SENP1C and Tat-EGFP
Fig.1 Construction of Tat-SENP1C and Tat-EGFP prokaryotic expression vector (a) Identification of Tat-SENP1C and Tat-EGFP PCR products (b) Tat-SENP1C and Tat-EGFP cloned to pGEM-T vector separately (c) Tat-SENP1C-T vector and Tat-EGFP-T vector were digested by NcoI and NotI (d) Tat-SENP1C or Tat-EGFP subcloned to pET-28a (e) Tat-SENP1C-pET-28a and Tat-EGFP-pET-28a recombinants were digested by NcoI and NotI. 1, 2: The recombinants vector failed to digested by NcoI and NotI;M: DNA marker
Fig.2 Examination of Recombinant protein expression by Comassie blue staining
Fig.3 Identification of the Tat-SENP1C and Tat-EGFP purity (a) Comassie blue staining results of purified Tat-SENP1C; (b) Comassie blue staining results of purified Tat-EGFP
Fig.4 Identification of Tat-EGFP penetration efficiency
Fig.5 Detection of Tat-SENP1C enzymatic activity (a) Effect of Tat-SENP1C on the total protein SUMOylation in HT22 cells. The SUMOylation level of overall protein were detected by immunoblotting with anti-SUMO1 antibody. Actin served as an internal control (b) Effect of Tat-SENP1C on the endogenous Akt1 SUMOylation. The Akt1-SUMO1 conjugation was checked by immunoprecipitation (IP) with anti-SUMO1 antibody followed by immunoblot (IB) with anti-Akt1 antibody. Akt1 expression was detected by immunoblot with anti-Akt1 antibody. Control: Unincubated Tat protein group; * P<0.05 vs control group (c) Effect of Tat-SENP1C on the exogenous Akt1 SUMOylation. The Akt1-SUMO1 conjugation and Akt1 protein expression were checked by immunoprecipitation (IP) with anti-Akt1 antibody followed by immunoblot (IB) with anti-SUMO1 or anti-Akt1 antibodies individually. Control: Unincubated Tat protein group; * P<0.05 vs control group
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