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Hou S, Wang S, Zhao X, Li W, Gao J, Wang Y, Zhang R, Gong L, Jiang S, Zhu Y. Establishment of indirect ELISA method for Salmonella antibody detection from ducks based on PagN protein. BMC Vet Res 2022; 18:424. [PMID: 36471338 PMCID: PMC9721058 DOI: 10.1186/s12917-022-03519-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 11/15/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Salmonella as an important food-borne zoonotic bacterial pathogen, infection in ducks is a recessive infection, however, it can also cause high mortality and threat to food safety. Preventing and controlling the infection and transmission of Salmonella in ducks critically require rapid and sensitive detection method. Full-length Salmonella-specific protein PagN was induced and expressed in E.coil BL21 and was purified as an antigen to establish an indirect enzyme-linked immunosorbent assays (iELSA) detection kit. RESULTS The recombinant PagN protein has a molecular weight of 43 kDa containing a His-tag, was recognized by an anti-Salmonella positive serum by Western blot assay. The optimal concentration of PagN as a coating antigen in the iELISA was 1 μg/mL, and the optimal dilution of enzyme-labeled secondary antibody was 1:4000 (0.025 μg/mL). The cutoff OD450 value was established at 0.268. The iELISA kit showed high selectivity since no cross-reaction with E. coli, Staphylococcus aureus and Streptococcus was observed. iELISA method and Dot-blot test were performed on 100 clinical sera samples collected from duck farms, and the actual coincidence rate was 89% (89/100). 613 duck serum samples from 3 different farms were tested using established method and commercial ELISA kit. The concordance between the two methods was 94.1%. CONCLUSION Anti-PagN based iELISA can serve as a useful tool for diagnosis of Salmonella infection.
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Affiliation(s)
- Shaopeng Hou
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Shuyang Wang
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Xinyuan Zhao
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Wei Li
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Jing Gao
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Yanjun Wang
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Ruihua Zhang
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Lingling Gong
- Shandong Provincial Quality Inspection Center of Animal Feed and Veterinary Medicine, Jinan, 250010 China
| | - Shijin Jiang
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
| | - Yanli Zhu
- grid.440622.60000 0000 9482 4676Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, 271018 China
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Chutia P, Das M, Goswami N, Choudhury M, Saha N, Sarma K. Deciphering the role of aquaporin 1 in the adaptation of the stinging catfish Heteropneustes fossilis to environmental hypertonicity by molecular dynamics simulation studies. J Biomol Struct Dyn 2022; 41:2075-2089. [PMID: 35040369 DOI: 10.1080/07391102.2022.2027272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
A thorough investigation of the water permeability of H. fossilis aquaporin 1 (hfAQP1) in a hypertonic environment can provide a useful insight into the understanding of the underlying molecular mechanism of its high tolerance to salinity. Here, we constructed a 3 D homology model of hfAQP1 by taking Bos taurus AQP1, AQP0, and human AQP2 as templates using I-TASSER. The model obtained has similar structural organizations with mammalian AQP1s in all aspects. We investigated the water permeability of the modeled hfAQP1 in a 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) membrane under neutral and 100 mM hypersalinity by subjecting each system to a 100 ns molecular dynamics simulation. Our results show that hypersalinity hinders water permeation across the membrane through the hfAQP1 channel. A change in the intermolecular distance between key residues of the ar/R selectivity filter along with charge redistribution resulted in the accommodation of only 2-6 water molecules inside the channel at once under hypersaline conditions. We investigated the mRNA expression pattern of hfaqp1 in osmoregulatory organs of H. fossilis in response to 100 mM hypertonicity by using qPCR analysis. The transcript was downregulated in kidney and GI tract, but upregulated in the Gills. Thus, the catfish survive in a hypertonic environment by reducing the transport of water in its cellular systems and downregulating the expression of the hfaqp1 gene. The results observed in our study can shed more light on the functionality of AQP1 in catfishes under salinity stress and aid in future researches on solving more gating mechanisms involved in its regulation.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Priyambada Chutia
- Animal Physiology and Biochemistry Laboratory, Department of Zoology, Gauhati University, Guwahati, Assam, India
| | - Manas Das
- Animal Physiology and Biochemistry Laboratory, Department of Zoology, Gauhati University, Guwahati, Assam, India.,Bioinformatics Infrastructure Facility, Gauhati University, Guwahati, Assam, India
| | - Nabajyoti Goswami
- Bioinformatics Infrastructure Facility, Assam Agriculture University, College of Veterinary Science, Khanapara, Guwahati, Assam, India
| | - Manisha Choudhury
- Bioinformatics Infrastructure Facility, Gauhati University, Guwahati, Assam, India.,Department of Biosciences and Bioengineering, IIT Bombay, Mumbai, Maharashtra, India
| | - Nirmalendu Saha
- Biochemical Adaptation Laboratory, Department of Zoology, North Eastern Hill University, Meghalaya, Shillong, India
| | - Kishore Sarma
- Bioinformatics Infrastructure Facility, Gauhati University, Guwahati, Assam, India
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Wu Y, Hu Q, Dehinwal R, Rakov AV, Grams N, Clemens EC, Hofmann J, Okeke IN, Schifferli DM. The Not so Good, the Bad and the Ugly: Differential Bacterial Adhesion and Invasion Mediated by Salmonella PagN Allelic Variants. Microorganisms 2020; 8:microorganisms8040489. [PMID: 32235448 PMCID: PMC7232170 DOI: 10.3390/microorganisms8040489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/24/2020] [Accepted: 03/28/2020] [Indexed: 11/21/2022] Open
Abstract
While advances in genomic sequencing have highlighted significant strain variability between and within Salmonella serovars, only a few protein variants have been directly related to evolutionary adaptation for survival, such as host specificity or differential virulence. The current study investigated whether allelic variation of the Salmonella adhesin/invasin PagN influences bacterial interaction with their receptors. The Salmonella enterica, subspecies enterica serovar Typhi (S. Typhi) allelic variant of PagN was found to bind significantly better to different enterocytes as well as to the extracellular matrix protein laminin than did the major Salmonella enterica, subspecies enterica serovar Typhimurium (S. Typhimurium) allele. The two alleles differed at amino acid residues 49 and 109 in two of the four predicted PagN surface loops, and residue substitution analysis revealed that a glutamic acid at residue 49 increased the adhesive and invasive properties of S. Typhi PagN. PagN sequence comparisons from 542 Salmonella strains for six representative S. enterica serovars and S. diarizonae further supported the role of glutamic acid at residues 49 and 109 in optimizing adhesion to cells and laminin, as well as for cell invasion. In summary, this study characterized unique residues in allelic variants of a virulence factor that participates in the colonization and invasive properties of different Salmonella stains, subspecies and serovars.
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Affiliation(s)
- Yanping Wu
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; (Y.W.); (R.D.); (A.V.R.); (N.G.)
- College of Animal Science and Technology, College of Veterinary Medicine, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China
| | - Qiaoyun Hu
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; (Y.W.); (R.D.); (A.V.R.); (N.G.)
| | - Ruchika Dehinwal
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; (Y.W.); (R.D.); (A.V.R.); (N.G.)
| | - Alexey V. Rakov
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; (Y.W.); (R.D.); (A.V.R.); (N.G.)
| | - Nicholas Grams
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; (Y.W.); (R.D.); (A.V.R.); (N.G.)
| | - Erin C. Clemens
- Department of Biology, Haverford College, Haverford, PA 19041, USA; (E.C.C.); (J.H.); (I.N.O.)
| | - Jennifer Hofmann
- Department of Biology, Haverford College, Haverford, PA 19041, USA; (E.C.C.); (J.H.); (I.N.O.)
| | - Iruka N. Okeke
- Department of Biology, Haverford College, Haverford, PA 19041, USA; (E.C.C.); (J.H.); (I.N.O.)
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, University of Ibadan, Ibadan 200284, Oyo State, Nigeria
| | - Dieter M. Schifferli
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; (Y.W.); (R.D.); (A.V.R.); (N.G.)
- Correspondence:
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