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Purification and Characterization of Trehalase From Acyrthosiphon pisum, a Target for Pest Control. Protein J 2021; 41:189-200. [PMID: 34845557 DOI: 10.1007/s10930-021-10032-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/17/2021] [Indexed: 10/19/2022]
Abstract
Insect trehalases are glycoside hydrolases essential for trehalose metabolism and stress resistance. We here report the extraction and purification of Acyrthosiphon pisum soluble trehalase (ApTreh-1), its biochemical and structural characterization, as well as the determination of its kinetic properties. The protein has been purified by ammonium sulphate precipitation, first followed by an anion-exchange and then by an affinity chromatography. The SDS-PAGE shows a main band at 70 kDa containing two isoforms of ApTreh-1 (X1 and X2), identified by mass spectrometry and slightly contrasting in the C-terminal region. A phylogenetic tree, a multiple sequence alignment, as well as a modelled 3D-structure were constructed and they all reveal the ApTreh-1 similarity to other insect trehalases, i.e. the two signature motifs 179PGGRFRELYYWDTY192 and 479QWDFPNAWPP489, a glycine-rich region 549GGGGEY554, and the catalytic residues Asp336 and Glu538. The optimum enzyme activity occurs at 45 °C and pH 5.0, with Km and Vmax values of ~ 71 mM and ~ 126 µmol/min/mg, respectively. The present structural and functional characterization of soluble A. pisum trehalase enters the development of new strategies to control the aphids pest without significant risk for non-target organisms and human health.
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Dong C, Fan Q, Li X, Huang Y, Han J, Fang X, Huan M, Ye X, Li Z, Cui Z. Expression and characterization of a novel trehalase from Microvirga sp. strain MC18. Protein Expr Purif 2021; 182:105846. [PMID: 33592252 DOI: 10.1016/j.pep.2021.105846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 12/30/2020] [Accepted: 02/09/2021] [Indexed: 10/22/2022]
Abstract
Trehalase catalyzes the hydrolysis of trehalose into two glucose molecules and is present in nearly all tissues in various forms. In this study, a putative bacterial trehalase gene, encoding a glycoside hydrolase family 15 (GH15) protein was identified in Microvirga sp. strain MC18 and heterologously expressed in E. coli. The specific activity of the purified recombinant trehalase MtreH was 24 U/mg, with Km and Vmax values of 23.45 mg/mL and 184.23 μmol/mg/min, respectively. The enzyme exhibited optimal activity at 40 °C and pH 7.0, whereby Ca2+ had a considerable positive effects on the catalytic activity and thermostability. The optimized enzymatic reaction conditions for the bioconversion of trehalose using rMtreH were determined as 40 °C, pH 7.0, 10 h and 1% trehalose concentration. The characterization of this bacterial trehalase improves our understanding of the metabolism and biological role of trehalose in prokaryotic organism.
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Affiliation(s)
- Chaonan Dong
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Qiwen Fan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xu Li
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yan Huang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Jian Han
- College of Agriculture, Xinjiang Agricultural University, XinJiang, 830052, China
| | - Xiaodong Fang
- Guangzhou Hanyun Pharmaceutical Technology Co. Ltd. Guangzhou, 510000, China
| | - Minghui Huan
- Microbial Research Institute of Liaoning Province, Chaoyang, 122000, China
| | - Xianfeng Ye
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Zhoukun Li
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Zhongli Cui
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China.
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Tevatiya S, Kumari S, Sharma P, Rani J, Chauhan C, Das De T, Pandey KC, Pande V, Dixit R. Molecular and Functional Characterization of Trehalase in the Mosquito Anopheles stephensi. Front Physiol 2020; 11:575718. [PMID: 33329025 PMCID: PMC7710876 DOI: 10.3389/fphys.2020.575718] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 10/20/2020] [Indexed: 02/05/2023] Open
Abstract
Like other insects, in blood-feeding mosquitoes, trehalase (TRE; EC 3.2.1.28), an enzyme that metabolizes trehalose, may influence a wide array of functions including flight, survival, reproduction, and vectorial capacity, but its role has not been investigated in detail. Here, we characterized a 1,839-bp-long transcript, encoding a 555-aa-long trehalase-2 homolog protein from the mosquito Anopheles stephensi. With a conserved insect homology, and in silico predicted membrane-bound protein, we tested whether trehalase (As-TreH) also plays a role in mosquito physiologies. Constitutive expression during aquatic development or adult mosquito tissues, and a consistent upregulation until 42 h of starvation, which was restored to basal levels after sugar supply, together indicated that As-TreH may have a key role in stress tolerance. A multifold enrichment in the midgut (p < 0.001819) and salivary glands (p < 4.37E-05) of the Plasmodium vivax-infected mosquitoes indicated that As-TreH may favor parasite development and survival in the mosquito host. However, surprisingly, after the blood meal, a consistent upregulation until 24 h in the fat body, and 48 h in the ovary, prompted to test its possible functional correlation in the reproductive physiology of the adult female mosquitoes. A functional knockdown by dsRNA-mediated silencing confers As-TreH ability to alter reproductive potential, causing a significant loss in the egg numbers (p < 0.001), possibly by impairing energy metabolism in the developing oocytes. Conclusively, our data provide initial evidence that As-TreH regulates multiple physiologies and may serve as a suitable target for designing novel strategies for vector control.
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Affiliation(s)
- Sanjay Tevatiya
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Seena Kumari
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Punita Sharma
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Jyoti Rani
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Charu Chauhan
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Tanwee Das De
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Kailash C. Pandey
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
| | - Veena Pande
- Department of Biotechnology, Kumaun University, Nainital, India
| | - Rajnikant Dixit
- Laboratory of Host-Parasite Interaction Studies, ICMR-National Institute of Malaria Research, New Delhi, India
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