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García García T, Ventroux M, Derouiche A, Bidnenko V, Correia Santos S, Henry C, Mijakovic I, Noirot-Gros MF, Poncet S. Phosphorylation of the Bacillus subtilis Replication Controller YabA Plays a Role in Regulation of Sporulation and Biofilm Formation. Front Microbiol 2018; 9:486. [PMID: 29619013 PMCID: PMC5871692 DOI: 10.3389/fmicb.2018.00486] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 03/01/2018] [Indexed: 11/13/2022] Open
Abstract
Bacillus subtilis cells can adopt different life-styles in response to various environmental cues, including planktonic cells during vegetative growth, sessile cells during biofilm formation and sporulation. While switching life-styles, bacteria must coordinate the progression of their cell cycle with their physiological status. Our current understanding of the regulatory pathways controlling the decision-making processes and triggering developmental switches highlights a key role of protein phosphorylation. The regulatory mechanisms that integrate the bacterial chromosome replication status with sporulation involve checkpoint proteins that target the replication initiator DnaA or the kinase phosphorelay controlling the master regulator Spo0A. B. subtilis YabA is known to interact with DnaA to prevent over-initiation of replication during vegetative growth. Here, we report that YabA is phosphorylated by YabT, a Ser/Thr kinase expressed during sporulation and biofilm formation. The phosphorylation of YabA has no effect on replication initiation control but hyper-phosphorylation of YabA leads to an increase in sporulation efficiency and a strong inhibition of biofilm formation. We also provide evidence that YabA phosphorylation affects the level of Spo0A-P in cells. These results indicate that YabA is a multifunctional protein with a dual role in regulating replication initiation and life-style switching, thereby providing a potential mechanism for cross-talk and coordination of cellular processes during adaptation to environmental change.
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Pandit S, Ravikumar V, Abdel-Haleem AM, Derouiche A, Mokkapati VRSS, Sihlbom C, Mineta K, Gojobori T, Gao X, Westerlund F, Mijakovic I. Low Concentrations of Vitamin C Reduce the Synthesis of Extracellular Polymers and Destabilize Bacterial Biofilms. Front Microbiol 2017; 8:2599. [PMID: 29317857 PMCID: PMC5748153 DOI: 10.3389/fmicb.2017.02599] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 12/13/2017] [Indexed: 11/13/2022] Open
Abstract
Extracellular polymeric substances (EPS) produced by bacteria form a matrix supporting the complex three-dimensional architecture of biofilms. This EPS matrix is primarily composed of polysaccharides, proteins and extracellular DNA. In addition to supporting the community structure, the EPS matrix protects bacterial biofilms from the environment. Specifically, it shields the bacterial cells inside the biofilm, by preventing antimicrobial agents from getting in contact with them, thereby reducing their killing effect. New strategies for disrupting the formation of the EPS matrix can therefore lead to a more efficient use of existing antimicrobials. Here we examined the mechanism of the known effect of vitamin C (sodium ascorbate) on enhancing the activity of various antibacterial agents. Our quantitative proteomics analysis shows that non-lethal concentrations of vitamin C inhibit bacterial quorum sensing and other regulatory mechanisms underpinning biofilm development. As a result, the EPS biosynthesis in reduced, and especially the polysaccharide component of the matrix is depleted. Once the EPS content is reduced beyond a critical point, bacterial cells get fully exposed to the medium. At this stage, the cells are more susceptible to killing, either by vitamin C-induced oxidative stress as reported here, or by other antimicrobials or treatments.
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Saadi A, Bouzouita A, Gayed KB, Jendoubi A, Rehaiem A, Kerkeni W, Ayed H, Cherif M, Slama RB, Boutiba I, Derouiche A, Chebil M. Comparaison de deux protocoles d’antibioprophylaxie pour la biopsie de la prostate : prophylaxie empirique versus prophylaxie ciblée selon la culture rectale. Prog Urol 2017. [DOI: 10.1016/j.purol.2017.07.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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54
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Saadi A, Bouzouita A, Essid M, Gharbi M, Ayed H, Kerkeni W, Cherif M, Slama RB, Derouiche A, Chebil M. Surrénalectomie pour phéochromocytome : étude comparative entre la voie laparoscopique et voie ouverte. Prog Urol 2017. [DOI: 10.1016/j.purol.2017.07.228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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55
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Saadi A, Bouzouita A, Kerkeni W, Ayed H, Ben Miled A, Cherif M, Ben Slama M, Mnif N, Derouiche A, Chebil M. Une masse abdominale. Rev Med Interne 2017; 38:347-348. [DOI: 10.1016/j.revmed.2016.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 02/20/2016] [Indexed: 10/21/2022]
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56
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Derouiche A, Petranovic D, Macek B, Mijakovic I. Bacillus subtilis single-stranded DNA-binding protein SsbA is phosphorylated at threonine 38 by the serine/threonine kinase YabT. PERIOD BIOL 2017. [DOI: 10.18054/pb.v118i4.4572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Background and purpose: Single-stranded DNA-binding proteins participate in all stages of DNA metabolism that involve single-stranded DNA, from replication, recombination, repair of DNA damage, to natural competence in species such as Bacillus subtilis. B. subtilis single-stranded DNA-binding proteins have previously been found to be phosphorylated on tyrosine and arginine residues. While tyrosine phosphorylation was shown to enhance the DNA-binding properties of SsbA, arginine phosphorylation was not functionally characterized.Materials and methods: We used mass spectrometry analysis to detect phosphorylation of SsbA purified from B. subtilis cells. The detected phosphorylation site was assessed for its influence on DNA-binding in vitro, using electrophoretic mobility shift assays. The ability of B. subtilis serine/threonine kinases to phosphorylate SsbA was assessed using in vitro phosphorylation assays.Results: In addition to the known tyrosine phosphorylation of SsbA on tyrosine 82, we identified a new phosphorylation site: threonine 38. The in vitro assays demonstrated that SsbA is preferentially phosphorylated by the B. subtilis Hanks-type kinase YabT, and phosphorylation of threonine 38 leads to enhanced cooperative binding to DNA.Conclusions: Our findings contribute to the emerging picture that bacterial proteins, exemplified here by SsbA, undergo phosphorylation at multiple residues. This results in a complex regulation of cellular functions, and suggests that the complexity of the bacterial cellular regulation may be underestimated.
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El Kardi Y, Jafri A, Anide A, Derouiche A. Composition en sodium et en acides gras saturés et trans dans six type de fast foods au Maroc. NUTR CLIN METAB 2017. [DOI: 10.1016/j.nupar.2016.10.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kerkeni W, Ayari Y, Charfi L, Bouzouita A, Ayed H, Cherif M, Ben Slama M, Mrad K, Derouiche A, Chebil M. Transitional Bladder Cell Carcinoma Spreading to the Skin. Urol Case Rep 2017; 11:17-18. [PMID: 28083478 PMCID: PMC5220250 DOI: 10.1016/j.eucr.2016.11.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 11/27/2016] [Accepted: 11/30/2016] [Indexed: 11/18/2022] Open
Abstract
Cutaneous metastases from bladder malignancies are rare. We report the case of a 74 year old man who underwent cysto-prostatectomy and adjuvant chemotherapy for a pT3b N+ bladder transitional cell carcinoma. Four months later, he presented with skin disseminated pigmented lesions. Skin biopsy confirmed cutaneous metastasis from urothelial carcinoma.
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Chakroun M, Kerkeni W, Saadi A, Ayed H, Bouzouita A, Cherif M, Ben Slama M, Derouiche A, Chebil M. Résultats de la cystectomie chez les sujets jeunes et les sujets âgés, étude comparative. Prog Urol 2016. [DOI: 10.1016/j.purol.2016.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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60
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Chakroun M, Kerkeni W, Saadi A, Ayed H, Bouzouita A, Cherif M, Ben Slama M, Derouiche A, Chebil M. Le pronostic des tumeurs vésicales en fonction du mode de présentation : les tumeurs non infiltrant le muscle qui progressent sont-elles associées à un moins bon pronostic ? Prog Urol 2016. [DOI: 10.1016/j.purol.2016.07.193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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61
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Chakroun M, Bouzouita A, Saadi A, Kerkeni W, Ayed H, Cherif M, Ben slama M, Derouiche A, Chebil M. Complications hémorragiques de la néphrolithotomie percutanée, quels facteurs prédictifs ? Prog Urol 2016. [DOI: 10.1016/j.purol.2016.07.179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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62
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Saadi A, Kerkeni W, Essid M, Ayed H, Bouzouita A, Cherif M, slama RB, Derouiche A, Chebil M. Quels sont les facteurs prédictifs de récidive des sténoses de l’urètre après une première urétrotomie interne ? Prog Urol 2016. [DOI: 10.1016/j.purol.2016.07.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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63
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Derouiche A, Shi L, Kalantari A, Mijakovic I. Substrate Specificity of the Bacillus subtilis BY-Kinase PtkA Is Controlled by Alternative Activators: TkmA and SalA. Front Microbiol 2016; 7:1525. [PMID: 27725816 PMCID: PMC5035731 DOI: 10.3389/fmicb.2016.01525] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 09/12/2016] [Indexed: 11/13/2022] Open
Abstract
Bacterial protein-tyrosine kinases (BY-kinases) are known to regulate different aspects of bacterial physiology, by phosphorylating cellular protein substrates. Physiological cues that trigger BY-kinases activity are largely unexplored. In Proteobacteria, BY-kinases contain a cytosol-exposed catalytic domain and a transmembrane activator domain in a single polypeptide chain. In Firmicutes, the BY-kinase catalytic domain and the transmembrane activator domain exist as separate polypeptides. We have previously speculated that this architecture might enable the Firmicutes BY-kinases to interact with alternative activators, and thus account for the observed ability of these kinases to phosphorylate several distinct classes of protein substrates. Here, we present experimental evidence that supports this hypothesis. We focus on the model Firmicute-type BY-kinase PtkA from Bacillus subtilis, known to phosphorylate several different protein substrates. We demonstrate that the transcriptional regulator SalA, hitherto known as a substrate of PtkA, can also act as a PtkA activator. In doing so, SalA competes with the canonical PtkA activator, TkmA. Our results suggest that the respective interactions of SalA and TkmA with PtkA favor phosphorylation of different protein substrates in vivo and in vitro. This observation may contribute to explaining how specificity is established in the seemingly promiscuous interactions of BY-kinases with their cellular substrates.
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Ouali MA, Derouiche A, Sqalli Houssaini T. Le pain boulanger et sa teneur en sel. Nephrol Ther 2016. [DOI: 10.1016/j.nephro.2016.07.121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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65
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Brunkhorst R, Bock H, Derouiche A. Reelin induces process growth in cultured astrocytes: Implication for glia-synaptic plasticity. Arch Ital Biol 2016; 153:249-54. [PMID: 27168410 DOI: 10.12871/00039829201541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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66
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Cherif M, Chakroun M, Bouzouita A, Dimassi H, Ayed H, Derouiche A, Ben Slama M, Chebil M. Caractéristiques épidémiologiques du cancer de la vessie chez la femme en Tunisie. AFRICAN JOURNAL OF UROLOGY 2016. [DOI: 10.1016/j.afju.2015.06.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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67
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Shi L, Ravikumar V, Derouiche A, Macek B, Mijakovic I. Tyrosine 601 of Bacillus subtilis DnaK Undergoes Phosphorylation and Is Crucial for Chaperone Activity and Heat Shock Survival. Front Microbiol 2016; 7:533. [PMID: 27148221 PMCID: PMC4835898 DOI: 10.3389/fmicb.2016.00533] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 03/31/2016] [Indexed: 01/10/2023] Open
Abstract
In order to screen for cellular substrates of the Bacillus subtilis BY-kinase PtkA, and its cognate phosphotyrosine-protein phosphatase PtpZ, we performed a triple Stable Isotope Labeling by Amino acids in Cell culture-based quantitative phosphoproteome analysis. Detected tyrosine phosphorylation sites for which the phosphorylation level decreased in the ΔptkA strain and increased in the ΔptpZ strain, compared to the wild type (WT), were considered as potential substrates of PtkA/PtpZ. One of those sites was the residue tyrosine 601 of the molecular chaperone DnaK. We confirmed that DnaK is a substrate of PtkA and PtpZ by in vitro phosphorylation and dephosphorylation assays. In vitro, DnaK Y601F mutant exhibited impaired interaction with its co-chaperones DnaJ and GrpE, along with diminished capacity to hydrolyze ATP and assist the re-folding of denatured proteins. In vivo, loss of DnaK phosphorylation in the mutant strain dnaK Y601F, or in the strain overexpressing the phosphatase PtpZ, led to diminished survival upon heat shock, consistent with the in vitro results. The decreased survival of the mutant dnaK Y601F at an elevated temperature could be rescued by complementing with the WT dnaK allele expressed ectopically. We concluded that the residue tyrosine 601 of DnaK can be phosphorylated and dephosphorylated by PtkA and PtpZ, respectively. Furthermore, Y601 is important for DnaK chaperone activity and heat shock survival of B. subtilis.
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Garcia-Garcia T, Poncet S, Derouiche A, Shi L, Mijakovic I, Noirot-Gros MF. Role of Protein Phosphorylation in the Regulation of Cell Cycle and DNA-Related Processes in Bacteria. Front Microbiol 2016; 7:184. [PMID: 26909079 PMCID: PMC4754617 DOI: 10.3389/fmicb.2016.00184] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 02/02/2016] [Indexed: 11/26/2022] Open
Abstract
In all living organisms, the phosphorylation of proteins modulates various aspects of their functionalities. In eukaryotes, protein phosphorylation plays a key role in cell signaling, gene expression, and differentiation. Protein phosphorylation is also involved in the global control of DNA replication during the cell cycle, as well as in the mechanisms that cope with stress-induced replication blocks. Similar to eukaryotes, bacteria use Hanks-type kinases and phosphatases for signal transduction, and protein phosphorylation is involved in numerous cellular processes. However, it remains unclear whether protein phosphorylation in bacteria can also regulate the activity of proteins involved in DNA-mediated processes such as DNA replication or repair. Accumulating evidence supported by functional and biochemical studies suggests that phospho-regulatory mechanisms also take place during the bacterial cell cycle. Recent phosphoproteomics and interactomics studies identified numerous phosphoproteins involved in various aspect of DNA metabolism strongly supporting the existence of such level of regulation in bacteria. Similar to eukaryotes, bacterial scaffolding-like proteins emerged as platforms for kinase activation and signaling. This review reports the current knowledge on the phosphorylation of proteins involved in the maintenance of genome integrity and the regulation of cell cycle in bacteria that reveals surprising similarities to eukaryotes.
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Rebai M, Kerkeni W, Krarti M, Saadi A, Ayed H, Bouzouita A, Cherif M, Derouiche A, Ben slama M, Chebil M. Intérêt de la lomboscopie dans le traitement des calculs de l’uretère lombaire. Prog Urol 2015; 25:754. [DOI: 10.1016/j.purol.2015.08.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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70
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Rebai M, Kerkeni W, Krarti M, Ayed H, Bouzouita A, Cherif M, Derouiche A, Ben slama M, Chebil M. Dysfonction érectile après traitement chirurgical de la fracture de la verge. Prog Urol 2015; 25:773. [DOI: 10.1016/j.purol.2015.08.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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71
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Saadi A, Bouzouita A, Cherif M, Ayed H, Kerkeni W, Derouiche A, Ben slama M, Chebil M. Contusion sur rein pathologique. Prog Urol 2015; 25:773-4. [DOI: 10.1016/j.purol.2015.08.119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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72
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Saadi A, Ayed H, Bouzouita A, Rebai H, Kerkeni W, Selmi S, Cherif M, Derouiche A, Ben Slama R, Chebil M. La pyélonéphrite emphysémateuse : notre expérience de traitement conservateur chez 18 patients. Prog Urol 2015; 25:810. [DOI: 10.1016/j.purol.2015.08.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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73
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Khechana S, Derradji F, Derouiche A. Integrated management of water resources in the valley of Oued-Souf (Algeria): Issues fitness for a new strategy. JOURNAL OF FUNDAMENTAL AND APPLIED SCIENCES 2015. [DOI: 10.4314/jfas.v2i2.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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74
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Kalantari A, Derouiche A, Shi L, Mijakovic I. Serine/threonine/tyrosine phosphorylation regulates DNA binding of bacterial transcriptional regulators. Microbiology (Reading) 2015. [DOI: 10.1099/mic.0.000148] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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75
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Derouiche A, Shi L, Bidnenko V, Ventroux M, Pigonneau N, Franz-Wachtel M, Kalantari A, Nessler S, Noirot-Gros MF, Mijakovic I. Bacillus subtilis SalA is a phosphorylation-dependent transcription regulator that represses scoC and activates the production of the exoprotease AprE. Mol Microbiol 2015; 97:1195-208. [PMID: 26094643 DOI: 10.1111/mmi.13098] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2015] [Indexed: 11/29/2022]
Abstract
Bacillus subtilis Mrp family protein SalA has been shown to indirectly promote the production of the exoprotease AprE by inhibiting the expression of scoC, which codes for a repressor of aprE. The exact mechanism by which SalA influences scoC expression has not been clarified previously. We demonstrate that SalA possesses a DNA-binding domain (residues 1-60), which binds to the promoter region of scoC. The binding of SalA to its target DNA depends on the presence of ATP and is stimulated by phosphorylation of SalA at tyrosine 327. The B. subtilis protein-tyrosine kinase PtkA interacts specifically with the C-terminal domain of SalA in vivo and in vitro and is responsible for activating its DNA binding via phosphorylation of tyrosine 327. In vivo, a mutant mimicking phosphorylation of SalA (SalA Y327E) exhibited a strong repression of scoC and consequently overproduction of AprE. By contrast, the non-phosphorylatable SalA Y327F and the ΔptkA exhibited the opposite effect, stronger expression of scoC and lower production of the exoprotease. Interestingly, both SalA and PtkA contain the same ATP-binding Walker domain and have thus presumably arisen from the common ancestral protein. Their regulatory interplay seems to be conserved in other bacteria.
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