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Kitauchi K, Sakono M. Glycoprotein quality control-related proteins effectively inhibit fibrillation of amyloid beta 1–42. Biochem Biophys Res Commun 2016; 481:227-231. [DOI: 10.1016/j.bbrc.2016.10.118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 10/27/2016] [Indexed: 11/28/2022]
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Guo H, Wang S, Xu F, Li Y, Ren J, Wang X, Niu H, Yin J. The role of thioredoxin h in protein metabolism during wheat (Triticum aestivum L.) seed germination. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 67:137-143. [PMID: 23562797 DOI: 10.1016/j.plaphy.2013.03.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Accepted: 03/05/2013] [Indexed: 06/02/2023]
Abstract
Thioredoxin h can regulate the redox environment in the cell and play an important role in the germination of cereals. In the present study, the thioredoxin s antisense transgenic wheat with down-regulation of thioredoxin h was used to study the role of thioredoxin h in protein metabolism during germination of wheat seeds, and to explore the mechanism of the thioredoxin s antisense transgenic wheat seeds having high resistance to pre-harvest sprouting. The qRT-PCR results showed that the expression of protein disulfide isomerase in the thioredoxin s antisense transgenic wheat was up-regulated, which induced easily forming glutenin macropolymers and the resistance of storage proteins to degradation. The expression of serine protease inhibitor was also up-regulated in transgenic wheat, which might be responsible for the decreased activity of thiocalsin during the germination. The expression of WRKY6 in transgenic wheat was down-regulated, which was consistent with the decreased activity of glutamine oxoglutarate aminotransferase. In transgenic wheat, the activities of glutamate dehydrogenase, glutamic pyruvic transaminase and glutamic oxaloacetic transaminase were down-regulated, indicating that the metabolism of amino acid was lower than that in wild-type wheat during seed germination. A putative model for the role of thioredoxin h in protein metabolism during wheat seed germination was proposed and discussed.
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Affiliation(s)
- Hongxiang Guo
- National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China; College of Life Sciences, Henan Agricultural University, Zhengzhou, China
| | - Shaoxin Wang
- College of Life Sciences, Henan Agricultural University, Zhengzhou, China
| | - Fangfang Xu
- College of Life Sciences, Henan Agricultural University, Zhengzhou, China
| | - Yongchun Li
- National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Jiangping Ren
- National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Xiang Wang
- National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Hongbin Niu
- National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China
| | - Jun Yin
- National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou, 450002, China.
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Chhikara N, Saraswat M, Tomar AK, Dey S, Singh S, Yadav S. Human epididymis protein-4 (HE-4): a novel cross-class protease inhibitor. PLoS One 2012; 7:e47672. [PMID: 23139753 PMCID: PMC3489902 DOI: 10.1371/journal.pone.0047672] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Accepted: 09/18/2012] [Indexed: 02/07/2023] Open
Abstract
Epididymal proteins represent the factors necessary for maturation of sperm and play a crucial role in sperm maturation. HE-4, an epididymal protein, is a member of whey acidic protein four-disulfide core (WFDC) family with no known function. A WFDC protein has a conserved WFDC domain of 50 amino acids with eight conserved cystine residue. HE-4 is a 124 amino acid long polypeptide with two WFDC domains. Here, we show that HE-4 is secreted in the human seminal fluid as a disulfide-bonded homo-trimer and is a cross-class protease inhibitor inhibits some of the serine, aspartyl and cysteine proteases tested using hemoglobin as a substrate. Using SPR we have also observed that HE-4 shows a significant binding with all these proteases. Disulfide linkages are essential for this activity. Moreover, HE-4 is N-glycosylated and highly stable on a wide range of pH and temperature. Taken together this suggests that HE-4 is a cross-class protease inhibitor which might confer protection against microbial virulence factors of proteolytic nature.
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Affiliation(s)
- Nirmal Chhikara
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Mayank Saraswat
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Anil Kumar Tomar
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Sharmistha Dey
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Sarman Singh
- Department of Lab Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Savita Yadav
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
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Ding X, Lv ZM, Zhao Y, Min H, Yang WJ. MTH1745, a protein disulfide isomerase-like protein from thermophilic archaea, Methanothermobacter thermoautotrophicum involving in stress response. Cell Stress Chaperones 2008; 13:239-46. [PMID: 18759006 PMCID: PMC2673884 DOI: 10.1007/s12192-008-0026-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Revised: 01/23/2008] [Accepted: 01/25/2008] [Indexed: 01/20/2023] Open
Abstract
MTH1745 is a putative protein disulfide isomerase characterized with 151 amino acid residues and a CPAC active-site from the anaerobic archaea Methanothermobacter thermoautotrophicum. The potential functions of MTH1745 are not clear. In the present study, we show a crucial role of MTH1745 in protecting cells against stress which may be related to its functions as a disulfide isomerase and its chaperone properties. Using real-time polymerase chain reaction analyses, the level of MTH1745 messenger RNA (mRNA) in the thermophilic archaea M. thermoautotrophicum was found to be stress-induced in that it was significantly higher under low (50 degrees C) and high (70 degrees C) growth temperatures than under the optimal growth temperature for the organism (65 degrees C). Additionally, the expression of MTH1745 mRNA was up-regulated by cold shock (4 degrees C). Furthermore, the survival of MTH1745 expressing Escherichia coli cells was markedly higher than that of control cells in response to heat shock (51.0 degrees C). These results indicated that MTH1745 plays an important role in the resistance of stress. By assay of enzyme activities in vitro, MTH1745 also exhibited a chaperone function by promoting the functional folding of citrate synthase after thermodenaturation. On the other hand, MTH1745 was also shown to function as a disulfide isomerase on the refolding of denatured and reduced ribonuclease A. On the basis of its single thioredoxin domain, function as a disulfide isomerase, and its chaperone activity, we suggest that MTH1745 may be an ancient protein disulfide isomerase. These studies may provide clues to the understanding of the function of protein disulfide isomerase in archaea.
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Affiliation(s)
- Xia Ding
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058 China
- College of Life Sciences, Nanchang University, Nanchang, Jiangxi 330000 China
| | - Zhen-Mei Lv
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058 China
| | - Yang Zhao
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058 China
| | - Hang Min
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058 China
- Room 223, College of Life Sciences, Zijingang Campus, Zhejiang University, Hangzhou, Zhejiang China 310030
| | - Wei-Jun Yang
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058 China
- Room 317, College of Life Sciences, Zijingang Campus, Zhejiang University, Hangzhou, Zhejiang China 310030
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Abstract
Although manipulation of the endoplasmic reticulum (ER) folding environment in the yeast Saccharomyces cerevisiae has been shown to increase the secretory productivity of recombinant proteins, the cellular interactions and processes of native enzymes and chaperones such as protein disulfide isomerase (PDI) are still unclear. Previously, we reported that overexpression of the ER chaperone PDI enabled up to a 3-fold increase in secretion levels of the Pyrococcus furiosus beta-glucosidase in the yeast S. cerevisiae. This result was surprising since beta-glucosidase contains only one cysteine per monomer and no disulfide bonds. Two possible mechanisms were proposed: PDI either forms a transient disulfide bond with the lone cysteine residue of the nascent beta-glucosidase during the folding and assembly process or acts as a chaperone to aid in proper folding. To discern between the two mechanisms, the single cysteine residue was mutated to serine, and the secretion of the two protein variants was determined. The serine mutant still showed increased secretion in vivo when PDI levels were elevated. When the folding bottleneck is removed by increasing expression temperatures to 37 degrees C rather than 30 degrees C, PDI no longer has an improvement on secretion. These results suggest that, unexpectedly, PDI acts in a chaperone-like capacity or possibly cooperates with the cell's folding or degradation mechanisms regardless of whether the protein is redox-active.
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Affiliation(s)
| | - Anne Skaja Robinson
- To whom correspondence should be addressed at: Tel: +1 302 831-0557, Fax: +1 302 831-1048,
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Bianchi L, Canton C, Bini L, Orlandi R, Ménard S, Armini A, Cattaneo M, Pallini V, Bernardi LR, Biunno I. Protein profile changes in the human breast cancer cell line MCF-7 in response toSEL1L gene induction. Proteomics 2005; 5:2433-42. [PMID: 15880780 DOI: 10.1002/pmic.200401283] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The ectopic expression of the gene SEL1L in the human breast carcinoma cell line MCF-7 resulted in a reduction of the aggressive behaviour of these cells in vitro. In addition, in vivo analysis on a series of primary breast carcinomas revealed an association between the SEL1L protein levels and the patient's overall survival. We aimed to find those proteins, associated with SEL1L, which may be involved in modulating the aggressive or invasive behaviour of breast cancer cells. For this purpose, we used both the proteomic and microarray approaches. Image analysis of two-dimensional electropherograms revealed the presence of 27 qualitative and 35 quantitative variations between the MCF7-SEL1L expressing cells compared to control. Mass spectrometry identified 32 changing proteins mostly involved in cytoskeletal and metabolic activities, stress response and protein folding, selenoprotein synthesis and cellular proliferation. Five of these also showed changes in transcript levels, as assessed by Affymetrix microarray analysis. Interestingly, seven proteins: carbonic anhydrase (CA) II, ovarian/breast septin, S100A16 calcium binding protein, 14-3-3 protein sigma, proteasome subunit beta type 6, Hsp60 and protein disulphide-isomerase A3 merit particular attention since they are known to be involved in cancer, in response to cellular stress and in protein folding.
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Affiliation(s)
- Laura Bianchi
- Functional Proteomics Laboratory, Department of Molecular Biology, University of Siena, Siena, Italy
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