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Serrapeptase impairs biofilm, wall, and phospho-homeostasis of resistant and susceptible Staphylococcus aureus. Appl Microbiol Biotechnol 2023; 107:1373-1389. [PMID: 36635396 PMCID: PMC9898353 DOI: 10.1007/s00253-022-12356-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 11/25/2022] [Accepted: 12/22/2022] [Indexed: 01/14/2023]
Abstract
Staphylococcus aureus biofilms are implicated in hospital infections due to elevated antibiotic and host immune system resistance. Molecular components of cell wall including amyloid proteins, peptidoglycans (PGs), and lipoteichoic acid (LTA) are crucial for biofilm formation and tolerance of methicillin-resistant S. aureus (MRSA). Significance of alkaline phosphatases (ALPs) for biofilm formation has been recorded. Serrapeptase (SPT), a protease of Serratia marcescens, possesses antimicrobial properties similar or superior to those of many antibiotics. In the present study, SPT anti-biofilm activity was demonstrated against S. aureus (ATCC 25923, methicillin-susceptible strain, methicillin-susceptible S. aureus (MSSA)) and MRSA (ST80), with IC50 values of 0.67 μg/mL and 7.70 μg/mL, respectively. SPT affected bacterial viability, causing a maximum inhibition of - 46% and - 27%, respectively. Decreased PGs content at [SPT] ≥ 0.5 μg/mL and ≥ 8 μg/mL was verified for MSSA and MRSA, respectively. In MSSA, LTA levels decreased significantly (up to - 40%) at lower SPT doses but increased at the highest dose of 2 μg/mL, a counter to spectacularly increased cellular and secreted LTA levels in MRSA. SPT also reduced amyloids of both strains. Additionally, intracellular ALP activity decreased in both MSSA and MRSA (up to - 85% and - 89%, respectively), while extracellular activity increased up to + 482% in MSSA and + 267% in MRSA. Altered levels of DING proteins, which are involved in phosphate metabolism, in SPT-treated bacteria, were also demonstrated here, implying impaired phosphorus homeostasis. The differential alterations in the studied molecular aspects underline the differences between MSSA and MRSA and offer new insights in the treatment of resistant bacterial biofilms. KEY POINTS: • SPT inhibits biofilm formation in methicillin-resistant and methicillin-susceptible S. aureus. • SPT treatment decreases bacterial viability, ALP activity, and cell wall composition. • SPT-treated bacteria present altered levels of phosphate-related DING proteins.
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Porzio E, Faraone Mennella MR, Manco G. DING Proteins Extend to the Extremophilic World. Int J Mol Sci 2021; 22:2035. [PMID: 33670786 PMCID: PMC7922408 DOI: 10.3390/ijms22042035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/04/2021] [Accepted: 02/16/2021] [Indexed: 11/16/2022] Open
Abstract
The DING proteins are ubiquitous in the three domains of life, from mesophiles to thermo- and hyperthermophiles. They belong to a family of more than sixty members and have a characteristic N-terminus, DINGGG, which is considered a "signature" of these proteins. Structurally, they share a highly conserved phosphate binding site, and a three dimensional organization resembling the "Venus Flytrap", both reminding the ones of PstS proteins. They have unusually high sequence conservation, even between distantly related species. Nevertheless despite that the genomes of most of these species have been sequenced, the DING gene has not been reported for all the relative characterized DING proteins. Identity of known DING proteins has been confirmed immunologically and, in some cases, by N-terminal sequence analysis. Only a few of the DING proteins have been purified and biochemically characterized. DING proteins are heterogeneous for their wide range of biological activities and some show different activities not always correlated with each other. Most of them have been originally identified for different biological properties, or rather for binding to phosphate and also to other ligands. Their involvement in pathologies is described. This review is an update of the most recent findings on old and new DING proteins.
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Affiliation(s)
- Elena Porzio
- Institute of Biochemistry and Cell Biology, CNR, Via P. Castellino 111, 80131 Naples, Italy;
| | | | - Giuseppe Manco
- Institute of Biochemistry and Cell Biology, CNR, Via P. Castellino 111, 80131 Naples, Italy;
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De Maio A, Porzio E, Rotondo S, Bianchi AR, Faraone-Mennella MR. In Sulfolobus solfataricus, the Poly(ADP-Ribose) Polymerase-Like Thermoprotein Is a Multifunctional Enzyme. Microorganisms 2020; 8:microorganisms8101523. [PMID: 33023025 PMCID: PMC7599888 DOI: 10.3390/microorganisms8101523] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 09/17/2020] [Accepted: 10/01/2020] [Indexed: 11/16/2022] Open
Abstract
In Sulfolobus solfataricus, Sso, the ADP-ribosylating thermozyme is known to carry both auto- and heteromodification of target proteins via short chains of ADP-ribose. Here, we provide evidence that this thermoprotein is a multifunctional enzyme, also showing ATPase activity. Electrophoretic and kinetic analyses were performed using NAD+ and ATP as substrates. The results showed that ATP is acting as a negative effector on the NAD+-dependent reaction, and is also responsible for inducing the dimerization of the thermozyme. These findings enabled us to further investigate the kinetic of ADP-ribosylation activity in the presence of ATP, and to also assay its ability to work as a substrate. Moreover, since the heteroacceptor of ADP-ribose is the sulfolobal Sso7 protein, known as an ATPase, some reconstitution experiments were set up to study the reciprocal influence of the ADP-ribosylating thermozyme and the Sso7 protein on their activities, considering also the possibility of direct enzyme/Sso7 protein interactions. This study provides new insights into the ATP-ase activity of the ADP-ribosylating thermozyme, which is able to establish stable complexes with Sso7 protein.
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Affiliation(s)
- Anna De Maio
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.R.); (A.R.B.)
- National Institute of Biostructures and Biosystems (INBB), via delle Medaglie d’oro, 00136 Rome, Italy
- Correspondence: (A.D.M.); (M.R.F.-M.); Tel.: +39-081-679134 (A.D.M.); +39-081-679136 (M.R.F.-M.)
| | - Elena Porzio
- Institute of Biochemistry and Cell Biology, CNR, via P.Castellino 111, 80131 Naples, Italy;
| | - Sergio Rotondo
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.R.); (A.R.B.)
| | - Anna Rita Bianchi
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.R.); (A.R.B.)
| | - Maria Rosaria Faraone-Mennella
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.R.); (A.R.B.)
- National Institute of Biostructures and Biosystems (INBB), via delle Medaglie d’oro, 00136 Rome, Italy
- Correspondence: (A.D.M.); (M.R.F.-M.); Tel.: +39-081-679134 (A.D.M.); +39-081-679136 (M.R.F.-M.)
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Chupácová J, Borghi E, Morace G, Los A, Bujdáková H. Anti-biofilm activity of antibody directed against surface antigen complement receptor 3-related protein-comparison of Candida albicans and Candida dubliniensis. Pathog Dis 2018; 76:4791528. [PMID: 29315379 DOI: 10.1093/femspd/ftx127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 12/27/2017] [Indexed: 11/13/2022] Open
Abstract
Candida albicans and C. dubliniensis are related yeasts that differ in the expression of virulence-associated proteins involved in adherence and biofilm development. CR3-RP (complement receptor 3-related protein) is one of the surface antigens expressed by Candida species. The main objective of this research was to elucidate the effect of the polyclonal anti-CR3-RP antibody (Ab) on adherence and the biofilm formed by C. albicans SC5314 and C. dubliniensis CBS 7987 and two clinical isolates in vitro, ex vivo and in vivo. A comparison of species, and of treated vs. non-treated with the anti-CR3-RP Ab showed a reduction in adherence (22%-41%) that was dependent on the time point of evaluation (60, 90 or 120 min), but did not prove to be species-dependent. Confocal microscopy revealed a decreased thickness in biofilms formed by both species after pre-treatment with the anti-CR3-RP Ab. This observation was confirmed ex vivo by immunohistochemistry analysis of biofilms formed on mouse tongues. Moreover, anti-CR3-RP Ab administration, 1 h post-infection, has been shown to promote larval survival compared to the control group in a Galleria mellonella infection model. Our data suggest a potential activity of the anti-CR3-RP Ab relevant to immunotherapy or vaccine development against biofilm-associated Candida infections.
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Affiliation(s)
- Jaroslava Chupácová
- Department of Microbiology and Virology, Comenius University in Bratislava, Faculty of Natural Sciences, Ilkovicova 6, 84215 Bratislava, Slovakia
| | - Elisa Borghi
- Università degli Studi di Milano, Department of Health Sciences, San Paolo Medical School, Via A. di Rudini 8, 20142 Milan, Italy
| | - Giulia Morace
- Università degli Studi di Milano, Department of Health Sciences, San Paolo Medical School, Via A. di Rudini 8, 20142 Milan, Italy
| | - Agata Los
- Department of Microbiology and Virology, Comenius University in Bratislava, Faculty of Natural Sciences, Ilkovicova 6, 84215 Bratislava, Slovakia
| | - Helena Bujdáková
- Department of Microbiology and Virology, Comenius University in Bratislava, Faculty of Natural Sciences, Ilkovicova 6, 84215 Bratislava, Slovakia
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Kim Y, Chung WS, Jang HJ. Proteins isolated of Pueraria Radix possible to cause allergenic react with immunoglobulin E in human sera. Mol Cell Toxicol 2018. [DOI: 10.1007/s13273-018-0025-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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6
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Porzio E, De Maio A, Ricciardi T, Mistretta C, Manco G, Faraone-Mennella MR. Comparison of the DING protein from the archaeon Sulfolobus solfataricus with human phosphate-binding protein and Pseudomonas fluorescence DING counterparts. Extremophiles 2018; 22:177-188. [PMID: 29327280 DOI: 10.1007/s00792-017-0985-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 12/08/2017] [Indexed: 10/18/2022]
Abstract
DING proteins represent a new group of 40 kDa-related members, ubiquitous in living organisms. The family also include the DING protein from Sulfolobus solfataricus, functionally related to poly(ADP-ribose) polymerases. Here, the archaeal protein has been compared with the human Phosphate-Binding Protein and the Pseudomonas fluorescence DING enzyme, by enzyme assays and immune cross-reactivity. Surprisingly, as the Sulfolobus enzyme, the Human and Pseudomonas proteins display poly(ADP-ribose) polymerase activity, whereas a phosphatase activity was only present in Sulfolobus and human protein, despite the conserved phosphate-binding site residues in Pseudomonas DING. All proteins were positive to anti-DING antibodies and gave a comparable pattern of anti-poly(ADP-ribose) polymerase immunoreactivity with two bands, at around 40 kDa and roughly at the double of this molecular mass. The latter signal was present in all Sulfolobus enzyme preparations and proved not due to either a contaminant or a precursor protein, but likely being a dimeric form of the 40 kDa polypeptide. The common immunological and partly enzymatic behavior linking human, Pseudomonas and Sulfolobus DING proteins, makes the archaeal protein an important model system to investigate DING protein function and evolution within the cell.
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Affiliation(s)
- Elena Porzio
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples "Federico II", 80126, Naples, Italy. .,Institute of Protein Biochemistry, National Research Council (CNR), 80131, Naples, Italy.
| | - Anna De Maio
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples "Federico II", 80126, Naples, Italy.,National Institute of Biostructures and Biosystems (INBB), via delle medaglie d'oro, 00136, Rome, Italy
| | - Teresa Ricciardi
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples "Federico II", 80126, Naples, Italy
| | - Carmela Mistretta
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples "Federico II", 80126, Naples, Italy.,Institute for Agricultural and Forest Systems in the Mediterranean, CNR, Ercolano, Italy
| | - Giuseppe Manco
- Institute of Protein Biochemistry, National Research Council (CNR), 80131, Naples, Italy.
| | - Maria Rosaria Faraone-Mennella
- Department of Biology, Polytechnic School of Basic Sciences, University of Naples "Federico II", 80126, Naples, Italy.,National Institute of Biostructures and Biosystems (INBB), via delle medaglie d'oro, 00136, Rome, Italy
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Brito-Argáez L, Tamayo-Sansores JA, Madera-Piña D, García-Villalobos FJ, Moo-Puc RE, Kú-González Á, Villanueva MA, Islas-Flores I. Biochemical characterization and immunolocalization studies of a Capsicum chinense Jacq. protein fraction containing DING proteins and anti-microbial activity. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2016; 109:502-514. [PMID: 27835848 DOI: 10.1016/j.plaphy.2016.10.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/24/2016] [Accepted: 10/25/2016] [Indexed: 06/06/2023]
Abstract
The DING protein family consists of proteins of great biological importance due to their ability to inhibit carcinogenic cell growth. A DING peptide with Mr ∼7.57 kDa and pI ∼5.06 was detected in G10P1.7.57, a protein fraction from Capsicum chinense Jacq. seeds. Amino acid sequencing of the peptide produced three smaller peptides showing identity to the DING protein family. G10P1.7.57 displayed a phosphatase activity capable of dephosphorylating different phosphorylated substrates and inhibited the growth of Saccharomyces cerevisiae cells. Western immunoblotting with a custom-made polyclonal antibody raised against a sequence (ITYMSPDYAAPTLAGLDDATK), derived from the ∼7.57 kDa polypeptide, immunodetected an ∼ 39 kDa polypeptide in G10P1.7.57. Purification by electroelution followed by amino acid sequencing of the ∼39 kDa polypeptide yielded seven new peptide sequences and an additional one identical to that of the initially identified peptide. Western immunoblotting of soluble proteins from C. chinense seeds and leaves revealed the presence of the ∼39 kDa polypeptide at all developmental stages, with increased accumulation when the organs reached maturity. Immunolocalization using Dabsyl chloride- or Alexa fluor 488-conjugated antibodies revealed a specific fluorescent signal in the cell cytoplasm at all developmental stages, giving support to the idea that the ∼39 kDa polypeptide is a soluble DING protein. Thus, we have identified and characterized a protein fraction with a DING protein from C. chinense.
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Affiliation(s)
- Ligia Brito-Argáez
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97200, Mérida, Yucatán, Mexico
| | - José A Tamayo-Sansores
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97200, Mérida, Yucatán, Mexico
| | - Dianeli Madera-Piña
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97200, Mérida, Yucatán, Mexico
| | - Francisco J García-Villalobos
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97200, Mérida, Yucatán, Mexico
| | - Rosa E Moo-Puc
- Unidad de Investigación, Instituto Mexicano del Seguro Social, IMSS, T1, C.P. 97150, Mérida, Yucatán, Mexico
| | - Ángela Kú-González
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97200, Mérida, Yucatán, Mexico
| | - Marco A Villanueva
- Unidad Académica de Sistemas Arrecifales, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Puerto Morelos, Quintana Roo, C.P. 77580, Mexico
| | - Ignacio Islas-Flores
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Colonia Chuburná de Hidalgo, C.P. 97200, Mérida, Yucatán, Mexico.
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A manganese catalase from Thermomicrobium roseum with peroxidase and catecholase activity. Extremophiles 2016; 21:201-210. [DOI: 10.1007/s00792-016-0896-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 11/18/2016] [Indexed: 01/12/2023]
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9
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Keegan R, Waterman DG, Hopper DJ, Coates L, Taylor G, Guo J, Coker AR, Erskine PT, Wood SP, Cooper JB. The 1.1 Å resolution structure of a periplasmic phosphate-binding protein fromStenotrophomonas maltophilia: a crystallization contaminant identified by molecular replacement using the entire Protein Data Bank. ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY 2016; 72:933-43. [DOI: 10.1107/s2059798316010433] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 06/28/2016] [Indexed: 01/27/2023]
Abstract
During efforts to crystallize the enzyme 2,4-dihydroxyacetophenone dioxygenase (DAD) fromAlcaligenessp. 4HAP, a small number of strongly diffracting protein crystals were obtained after two years of crystal growth in one condition. The crystals diffracted synchrotron radiation to almost 1.0 Å resolution and were, until recently, assumed to be formed by the DAD protein. However, when another crystal form of this enzyme was eventually solved at lower resolution, molecular replacement using this new structure as the search model did not give a convincing solution with the original atomic resolution data set. Hence, it was considered that these crystals might have arisen from a protein impurity, although molecular replacement using the structures of common crystallization contaminants as search models again failed. A script to perform molecular replacement usingMOLREPin which the first chain of every structure in the PDB was used as a search model was run on a multi-core cluster. This identified a number of prokaryotic phosphate-binding proteins as scoring highly in theMOLREPpeak lists. Calculation of an electron-density map at 1.1 Å resolution based on the solution obtained with PDB entry 2q9t allowed most of the amino acids to be identified visually and built into the model. ABLASTsearch then indicated that the molecule was most probably a phosphate-binding protein fromStenotrophomonas maltophilia(UniProt ID B4SL31; gene ID Smal_2208), and fitting of the corresponding sequence to the atomic resolution map fully corroborated this. Proteins in this family have been linked to the virulence of antibiotic-resistant strains of pathogenic bacteria and with biofilm formation. The structure of theS. maltophiliaprotein has been refined to anRfactor of 10.15% and anRfreeof 12.46% at 1.1 Å resolution. The molecule adopts the type II periplasmic binding protein (PBP) fold with a number of extensively elaborated loop regions. A fully dehydrated phosphate anion is bound tightly between the two domains of the protein and interacts with conserved residues and a number of helix dipoles.
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Le Douce V, Ait-Amar A, Forouzan Far F, Fahmi F, Quiel J, El Mekdad H, Daouad F, Marban C, Rohr O, Schwartz C. Improving combination antiretroviral therapy by targeting HIV-1 gene transcription. Expert Opin Ther Targets 2016; 20:1311-1324. [PMID: 27266557 DOI: 10.1080/14728222.2016.1198777] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Combination Antiretroviral Therapy (cART) has not allowed the cure of HIV. The main obstacle to HIV eradication is the existence of quiescent reservoirs. Several other limitations of cART have been described, such as strict life-long treatment and high costs, restricting it to Western countries, as well as the development of multidrug resistance. Given these limitations and the impetus to find a cure, the development of new treatments is necessary. Areas covered: In this review, we discuss the current status of several efficient molecules able to suppress HIV gene transcription, including NF-kB and Tat inhibitors. We also assess the potential of new proteins belonging to the intriguing DING family, which have been reported to have potential anti-HIV-1 activity by inhibiting HIV gene transcription. Expert opinion: Targeting HIV-1 gene transcription is an alternative approach, which could overcome cART-related issues, such as the emergence of multidrug resistance. Improving cART will rely on the identification and characterization of new actors inhibiting HIV-1 transcription. Combining such efforts with the use of new technologies, the development of new models for preclinical studies, and improvement in drug delivery will considerably reduce drug toxicity and thus increase patient adherence.
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Affiliation(s)
- Valentin Le Douce
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France.,b IUT de Schiltigheim , Schiltigheim , France.,c UCD Centre for Research in Infectious Diseases (CRID) School of Medicine and Medical Science , University College Dublin , Dublin 4 , Ireland
| | - Amina Ait-Amar
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France
| | - Faezeh Forouzan Far
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France
| | - Faiza Fahmi
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France
| | - Jose Quiel
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France
| | - Hala El Mekdad
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France
| | - Fadoua Daouad
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France
| | - Céline Marban
- d Faculté de Chirurgie Dentaire , Inserm UMR 1121 , Strasbourg , France
| | - Olivier Rohr
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France.,b IUT de Schiltigheim , Schiltigheim , France.,e Institut Universitaire de France , Paris , France
| | - Christian Schwartz
- a Institut de Parasitologie et de Pathologie Tropicale, EA7292 , Université de Strasbourg , Strasbourg , France.,b IUT de Schiltigheim , Schiltigheim , France
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Paulovičová E, Bujdáková H, Chupáčová J, Paulovičová L, Kertys P, Hrubiško M. Humoral immune responses to Candida albicans complement receptor 3-related protein in the atopic subjects with vulvovaginal candidiasis. Novel sensitive marker for Candida infection. FEMS Yeast Res 2015; 15:fou001. [DOI: 10.1093/femsyr/fou001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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12
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Sachdeva R, Li Y, Shilpi RY, Simm M. Human X-DING-CD4 mediates resistance to HIV-1 infection through novel paracrine-like signaling. FEBS J 2015; 282:937-50. [PMID: 25581464 DOI: 10.1111/febs.13192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 01/06/2015] [Accepted: 01/07/2015] [Indexed: 11/30/2022]
Abstract
X-DING-CD4 is a novel phosphatase mediating antiviral responses to HIV-1 infection. This protein is constitutively expressed and secreted by HIV-1 resistant CD4(+) T cells and its mRNA transcription is up-regulated in peripheral blood mononuclear cells from HIV-1 elite controllers. The secreted/soluble X-DING-CD4 protein form is of particular importance because it blocks virus transcription when added to HIV-1 susceptible cells. The present study aimed to determine the contribution of this factor to the induction of the antiviral response in target cells. We found that soluble X-DING-CD4 enters cells by endocytosis and that influx of this protein induced transcription of interferon-α and endogenous X-DING-CD4 mRNA in transformed CD4(+) T cells and primary macrophages. Treatment of HIV-1 susceptible cells with exogenous X-DING-CD4 caused depletion of phosphorylated p50 and p65 nuclear factor kappa β subunits and a significant reduction in p50/p65 nuclear factor kappa β binding to the HIV-1 long terminal repeat. Taken together, these findings indicate a novel antiviral mechanism mediated by the influx of soluble X-DING-CD4, its signaling to promote self-amplification, and functional duality as an endogenous innate immunity effector and exogenous factor regulating gene expression in bystander cells.
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Affiliation(s)
- Rakhee Sachdeva
- Protein Chemistry Laboratory, St Luke's/Roosevelt Institute for Health Sciences, Columbia University, New York, NY, USA
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Sippel KH, Bacik J, Quiocho FA, Fisher SZ. Preliminary time-of-flight neutron diffraction studies of Escherichia coli ABC transport receptor phosphate-binding protein at the Protein Crystallography Station. Acta Crystallogr F Struct Biol Commun 2014; 70:819-22. [PMID: 24915101 PMCID: PMC4051545 DOI: 10.1107/s2053230x14009704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 04/29/2014] [Indexed: 11/10/2022] Open
Abstract
Inorganic phosphate is an essential molecule for all known life. Organisms have developed many mechanisms to ensure an adequate supply, even in low-phosphate conditions. In prokaryotes phosphate transport is instigated by the phosphate-binding protein (PBP), the initial receptor for the ATP-binding cassette (ABC) phosphate transporter. In the crystal structure of the PBP-phosphate complex, the phosphate is completely desolvated and sequestered in a deep cleft and is bound by 13 hydrogen bonds: 12 to protein NH and OH donor groups and one to a carboxylate acceptor group. The carboxylate plays a key recognition role by accepting a phosphate hydrogen. PBP phosphate affinity is relatively consistent across a broad pH range, indicating the capacity to bind monobasic (H2PO4-) and dibasic (HPO4(2-)) phosphate; however, the mechanism by which it might accommodate the second hydrogen of monobasic phosphate is unclear. To answer this question, neutron diffraction studies were initiated. Large single crystals with a volume of 8 mm3 were grown and subjected to hydrogen/deuterium exchange. A 2.5 Å resolution data set was collected on the Protein Crystallography Station at the Los Alamos Neutron Science Center. Initial refinement of the neutron data shows significant nuclear density, and refinement is ongoing. This is the first report of a neutron study from this superfamily.
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Affiliation(s)
- K. H. Sippel
- Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - J. Bacik
- Bioscience Division B-11, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - F. A. Quiocho
- Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - S. Z. Fisher
- Scientific Activities Division, European Spallation Source, 221 00 Lund, Sweden
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Gonzalez D, Elias M, Chabrière E. The DING Family of Phosphate Binding Proteins in Inflammatory Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 824:27-32. [DOI: 10.1007/978-3-319-07320-0_4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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