scholarly journals Positive Control of Swarming, Rhamnolipid Synthesis, and Lipase Production by the Posttranscriptional RsmA/RsmZ System in Pseudomonas aeruginosa PAO1

2004 ◽  
Vol 186 (10) ◽  
pp. 2936-2945 ◽  
Author(s):  
Karin Heurlier ◽  
Faye Williams ◽  
Stephan Heeb ◽  
Corinne Dormond ◽  
Gabriella Pessi ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Target Genes ◽  
Rna Binding ◽  
Regulatory Protein ◽  
Lipase Production ◽  
Positive Control ◽  
Negative Control ◽  
Control Element ◽  
Signal Molecules ◽  
Positive Effects

ABSTRACT In Pseudomonas aeruginosa, the small RNA-binding, regulatory protein RsmA is a negative control element in the formation of several extracellular products (e.g., pyocyanin, hydrogen cyanide, PA-IL lectin) as well as in the production of N-acylhomoserine lactone quorum-sensing signal molecules. RsmA was found to control positively the ability to swarm and to produce extracellular rhamnolipids and lipase, i.e., functions contributing to niche colonization by P. aeruginosa. An rsmA null mutant was entirely devoid of swarming but produced detectable amounts of rhamnolipids, suggesting that factors in addition to rhamnolipids influence the swarming ability of P. aeruginosa. A small regulatory RNA, rsmZ, which antagonized the effects of RsmA, was identified in P. aeruginosa. Expression of the rsmZ gene was dependent on both the global regulator GacA and RsmA, increased with cell density, and was subject to negative autoregulation. Overexpression of rsmZ and a null mutation in rsmA resulted in quantitatively similar, negative or positive effects on target genes, in agreement with a model that postulates titration of RsmA protein by RsmZ RNA.

scholarly journals Negative Control of Quorum Sensing by RpoN (σ54) in Pseudomonas aeruginosa PAO1

2003 ◽  
Vol 185 (7) ◽  
pp. 2227-2235 ◽  
Author(s):  
Karin Heurlier ◽  
Valerie Dénervaud ◽  
Gabriella Pessi ◽  
Cornelia Reimmann ◽  
Dieter Haas
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Quorum Sensing ◽  
Hydrogen Cyanide ◽  
Regulatory Gene ◽  
Regulatory Protein ◽  
Homoserine Lactone ◽  
Negative Control ◽  
Signal Molecules ◽  
Cell Densities ◽  
Global Regulatory Gene

ABSTRACT In Pseudomonas aeruginosa PAO1, the expression of several virulence factors such as elastase, rhamnolipids, and hydrogen cyanide depends on quorum-sensing regulation, which involves the lasRI and rhlRI systems controlled by N-(3-oxododecanoyl)-l-homoserine lactone and N-butyryl-l-homoserine lactone, respectively, as signal molecules. In rpoN mutants lacking the transcription factor σ54, the expression of the lasR and lasI genes was elevated at low cell densities, whereas expression of the rhlR and rhlI genes was markedly enhanced throughout growth by comparison with the wild type and the complemented mutant strains. As a consequence, the rpoN mutants had elevated levels of both signal molecules and overexpressed the biosynthetic genes for elastase, rhamnolipids, and hydrogen cyanide. The quorum-sensing regulatory protein QscR was not involved in the negative control exerted by RpoN. By contrast, in an rpoN mutant, the expression of the gacA global regulatory gene was significantly increased during the entire growth cycle, whereas another global regulatory gene, vfr, was downregulated at high cell densities. In conclusion, it appears that GacA levels play an important role, probably indirectly, in the RpoN-dependent modulation of the quorum-sensing machinery of P. aeruginosa.

THE EFFECTIVENESS TEST OF MATOA (PometiaPinnata) ENDOPHYTIC BACTERIA TOWARDS BACTERIA NOSOCOMIAL INFECTION

2020 ◽  
Vol 1 (1) ◽  
pp. 37-40
Author(s):  
Denny Chandra Halid
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Nosocomial Infection ◽  
Staphylococcus Epidermidis ◽  
Endophytic Bacteria ◽  
Positive Control ◽  
Negative Control ◽  
Bacterial Isolates ◽  
Series Design ◽  
Inhibition Zones ◽  
The One

This study aims to determine the effectiveness of Matoa (Pometiapin-nata) endophytic bacteria towards bacteria nosocomial infection namely Pseudomonas aeruginosa and Staphylococcus epidermidis. The subjects in the study were Matoa plant endophytic bacterial isolates on the stem (tw-igs). The positive control used is meropenem & negative control of aquades. This type of research uses quasi-experiments with a research design us-ing the One-Group Time-Series Design. The result of the study shows that there are 2 endophytic bacterial iso-lates in Matoa plants namely BEM 1 and BEM 2. Both endophytic bacterial isolates can kill and inhibits bacterial nosocomial infections Pseudomonas aeruginosa and Staphylococcus epider-midis with inhibition zones in the range of 16mm-22mm with a strong category very strong that it has the po-tential to be used as an antibacterial

scholarly journals The cmaR gene of Corynebacterium ammoniagenes performs a novel regulatory role in the metabolism of sulfur-containing amino acids

Microbiology ◽  
2009 ◽  
Vol 155 (6) ◽  
pp. 1878-1889 ◽  
Author(s):  
Seok-Myung Lee ◽  
Byung-Joon Hwang ◽  
Younhee Kim ◽  
Heung-Shick Lee
Keyword(s):  
Amino Acids ◽  
Target Genes ◽  
Sulfur Metabolism ◽  
Regulatory Gene ◽  
Positive Control ◽  
Negative Control ◽  
Biosynthetic Genes ◽  
Corynebacterium Ammoniagenes ◽  
Essential Function

A novel regulatory gene, which performs an essential function in sulfur metabolism, has been identified in Corynebacterium ammoniagenes and was designated cmaR (cysteine and methionine regulator in C. ammoniagenes). The cmaR-disrupted strain (ΔcmaR) lost the ability to grow on minimal medium, and was identified as a methionine and cysteine double auxotroph. The mutant strain proved unable to convert cysteine to methionine (and vice versa), and lost the ability to assimilate and reduce sulfate to sulfide. In the ΔcmaR strain, the mRNAs of the methionine biosynthetic genes metYX, metB and metFE were significantly reduced, and the activities of the methionine biosynthetic enzymes cystathionine γ-synthase, O-acetylhomoserine sulfhydrylase, and cystathionine β-lyase were relatively low, thereby suggesting that the cmaR gene exerts a positive regulatory effect on methionine biosynthetic genes. In addition, with the exception of cysK, reduced transcription levels of the sulfur-assimilatory genes cysIXYZ and cysHDN were noted in the cmaR-disrupted strain, which suggests that sulfur assimilation is also under the positive control of the cmaR gene. Furthermore, the expression of the cmaR gene itself was strongly induced via the addition of cysteine or methionine alone, but not the introduction of both amino acids together to the growth medium. In addition, the expression of the cmaR gene was enhanced in an mcbR-disrupted strain, which suggests that cmaR is under the negative control of McbR, which has been identified as a global regulator of sulfur metabolism. DNA binding of the purified CmaR protein to the promoter region of its target genes could be demonstrated in vitro. No metabolite effector was required for the protein to bind DNA. These results demonstrated that the cmaR gene of C. ammoniagenes plays a role similar to but distinct from that of the functional homologue cysR of Corynebacterium glutamicum.

scholarly journals The Potential of Mango (Mangifera infica L.) Peel of Apple Varieties By Infusion And Maceration In Inhibiting Pseudomonas aeruginosa And Propionibacterium acnes

2021 ◽  
Vol 4 (1) ◽  
pp. 1-6
Author(s):  
Vifin Putri Rahmawati ◽  
Chylen Setiyo Rini
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Mangifera Indica ◽  
Inhibition Zone ◽  
Positive Control ◽  
Negative Control ◽  
Diffusion Method ◽  
Chemical Components ◽  
Extract Concentration ◽  
Potential Test ◽  
Antibacterial Potential

Plants have many chemical components. The use of natural ingredients as an alternative treatment in dealing with diseases, especially acne. One of them is mango (Mangifera indica L.) varieties of apples obtained at the Larangan Main Market in Sidoarjo. This study aims to determine the potential of infusion and maceration of mango skin varieties in inhibiting Pseudomonas aeruginosa and Propionibactrium acne at various concentrations. This antibacterial potential test was carried out using the diffusion method of the wells. The antibacterial potential is characterized by the formation of a clear zone around the well called the inhibition zone. This study uses 10 concentrations namely 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% and Clindamycin as positive control and aquades as negative control. Based on the results of the Two Way ANOVA test data obtained were not normally distributed, therefore a comparison test was performed using the Kruskal-Wallis test with a sign value (α <0.05). This showed that there were significant differences in the use of various concentrations. The maceration extract concentration of 100% is the best concentration to form a zone of inhibition against P. aeruginosa  of 17.9 mm and P. acne bacteria of 13.2 mm. The results of the infusion extract concentration did not form inhibitory zones in both of P. aeruginosa and P. acnes.

scholarly journals Aktivitas Ekstrak Daun Bangle (zingiber purpureum roxb.) Terhadap Pertumbuhan Bakteri Pseudomonas aeruginosa

2020 ◽  
Vol 2 (1) ◽  
pp. 31-38
Author(s):  
Fajrin Noviyanto ◽  
Siti Hodijah ◽  
Yusransyah Yusransyah
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Inhibitory Concentration ◽  
Chemical Constituents ◽  
Ethanol Extract ◽  
Average Diameter ◽  
Positive Control ◽  
Negative Control ◽  
High Morbidity ◽  
Leaf Extracts ◽  
Control Solution

The bacteria that cause infections that can lead to high morbidity and mortality, the bacterium Pseudomonas aeruginosa. Bangle has a pharmacological activity as antibacterial, laxative, pancreatic lipase inhibitor, and protect cells from damage caused by oxidative stress. The purpose of this study are: to know the chemical constituents present in the extract of leaves bangle (Zingiber purpureum Roxb.) Can be efficacious as an antibacterial and knowing Minimal Inhibitory concentration (MIC) of the extracts of leaves bangle against Pseudomonas aeruginosa. Tests on the leaf extracts for antibacterial activity against Pseudomonas aeruginosa bangle made by the method of Kirby Bauer and solvents used are DMSO. Test solution with a concentration of leaf extract bangle 200, 400, 600, 800 and 1,000 ppm, the positive control solution (ciprofoxacin) and the solution negative control (DMSO). The results showed that the chemical constituents present in the extract of leaves bangle (Zingiber purpureum Roxb.) Are flavonoids, saponins, tannins, alkaloids and steroids. Value Minimum Inhibitory Concentration (MIC) of ethanol extract of the leaf bangle S bacteria Pseudomonas aeruginosa is a concentration of 40 % with an average diameter of 5.44 mm inhibitory. MIC extract ethanol extract of leaf bangle belonging to the bacterial activity that is strong enough..

scholarly journals REPRESSOR AND ANTIREPRESSOR IN THE REGULATION OF STAPHYLOCOCCAL PENICILLINASE SYNTHESIS

Genetics ◽  
1973 ◽  
Vol 75 (1) ◽  
pp. 1-17
Author(s):  
John Imsande
Keyword(s):  
Staphylococcus Aureus ◽  
Binding Site ◽  
Regulatory Protein ◽  
Positive Control ◽  
Negative Control ◽  
Biochemical Data ◽  
Wild Type ◽  
Data Support ◽  
Operator Binding ◽  
Effector Binding

ABSTRACT 5-methyltryptophan (5MT) induces penicillinase synthesis in Staphylococcus aureus. The analog is incorporated into protein by both wild-type and tryptophan-starved cells. Since normal penicillinase repressor appears to contain tryptophan even though penicillinase itself does not, it is concluded that 5MT induces penicillinase synthesis by becoming incorporated into the penicillinase repressor and thereby inactivating the repressor. Thus biochemical data support the existence of a penicillinase repressor and indicate that penicillinase synthesis is regulated by negative control and not by positive control.—In the absence of exogenous tryptophan, staphylococcal penicillinase induction can be inhibited by 7-azatryptophan (7azaT). Because 7azaT is incorporated into protein by tryptophan-starved cells, it is concluded that 7azaT blocks penicillinase induction by inactivating a penicillinase regulatory protein into which the analog has been incorporated. Incorporation of 7azaT does not appear to inactivate the operator binding site or the effector binding site on the penicillinase repressor. Therefore, it appears that 7azaT blocks penicillinase induction by inactivating the penicillinase antirepressor, a protein required for inactivation of the penicillinase repressor and, hence, required for penicillinase induction.

PSXVI-29 Late-Breaking: Effect of dietary organic acids supplementation on growth performance, nutrient digestibility, and gut health in weaned pigs

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 383-383
Author(s):  
Jinyoung Lee ◽  
Jong Woong Kim ◽  
Heidi Hall ◽  
Martin Nyachoti
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Phase 1 ◽  
Positive Control ◽  
Negative Control ◽  
Nutrient Digestibility ◽  
Gut Health ◽  
Weaned Pigs ◽  
Positive Effects ◽  
Two Phases

Abstract This study was conducted to investigate the effects of dietary supplementation with different organic acid (OA) mixtures on growth performance, nutrient digestibility, and gut health in weaned pigs. A total of 56 weaned pigs (7.93 ± 1.04 kg BW) were assigned to 4 dietary treatments in a randomized complete block design with 7 replicates per treatment for a 35-d study conducted over two phases; phase 1 (d 1 to 14) and phase 2 (d 14 to 35). Each pen had two pigs balanced for sex. Diets consisted of 1) a corn-soybean meal-basal without any additive (negative control, NC); 2) NC + formic and propionic acids (TRT1); 3) NC + butyric, formic, and propionic acids (TRT2); and 4) NC + antibiotic (positive control, PC). Individual pig body weight and feed disappearance were recorded weekly. At the end of each phase, blood and feces were sampled. The female pig in each pen was euthanized on d 35 to collect digesta and intestinal tissue. Data were analyzed using the PROC MIXED of SAS. During the overall period, ADG tended to be lower (P = 0.069) in the TRT2 group than in the PC group. Diet had no effect on ADFI during the overall period, but G:F of pigs fed the PC and TRT1 diets tended to be higher (P = 0.059) than that of the NC diet. No effects of OA supplementation were observed on nutrient digestibility and blood cytokine. Jejunal villus height to crypt depth ratio was higher (P &lt; 0.05) in TRT1-fed pigs than that of NC-fed pigs. Pigs fed the TRT2 diet had a higher (P &lt; 0.05) fecal abundance of Bifidobacteria than those fed the PC diet in phase 1. In conclusion, dietary OA supplementation had positive effects on growth performance and gut health but no effect on nutrient digestibility in weaned pigs.

Emerging Multi-cancer Regulatory Role of ESRP1: Orchestration of Alternative Splicing to Control EMT

2020 ◽  
Vol 20 (9) ◽  
pp. 654-665
Author(s):  
Yellamandayya Vadlamudi ◽  
Debasish K. Dey ◽  
Sun C. Kang
Keyword(s):  
Cell Proliferation ◽  
Alternative Splicing ◽  
Tumor Growth ◽  
Cancer Progression ◽  
Target Genes ◽  
Rna Binding ◽  
Regulatory Protein ◽  
Cancer Therapeutics ◽  
Scientific Data

RNA binding proteins (RBPs) associate with nascent and mature RNAs to perform biological functions such as alternative splicing and RNA stability. Having unique RNA recognition binding motifs, RBPs form complexes with RNA in a sequence- and structure-based manner. Aberrant expressions of several RBPs have been identified in tumorigenesis and cancer progression. These uncontrolled RBPs affect several mechanisms, including cell proliferation, tumor growth, invasion, metastasis and chemoresistance. Epithelial splicing regulatory protein 1 (ESRP1) is a member of the hnRNP family of proteins that play a crucial role in regulating numerous cellular processes, including alternative splicing and translation of multiple genes during organogenesis. Abnormal expression of ESRP1 alters the cell morphology, and leads to cell proliferation and tumor growth during cancer progression. ESRP1 mediated alternative splicing of target genes, including CD44, FGFR, PTBP1, LYN, ENAH, SPAG1 and ZMYND8, results in cancer progression. In addition, ESRP1 also regulates circularization and biogenesis of circular RNAs such as circUHRF1, circNOL10 and circANKS1B, whose expressions have been identified as key factors in various cancers. This multi-functional protein is also involved in imposing stability of target mRNAs such as cyclin A2, and thereby cell cycle regulation. The scope of this review is to examine recent scientific data, outcomes of the up- and down-regulated proteins, and the role of ESRP1 in various cancers. We conclude by summarizing ESRP1 dysregulation and its consequences on target genes in various human cancers. Collectively, the consequences of ESRP1 mediated splicing in cancer cells suggest the role of ESRP1 in cell proliferation and chemoresistance via apoptosis and autophagy modulation, which could, therefore, be potential targets for cancer therapeutics.

scholarly journals An incoherent feedforward loop formed by SirA/BarA, HilE and HilD is involved in controlling the growth cost of virulence factor expression by Salmonella Typhimurium

2021 ◽  
Vol 17 (5) ◽  
pp. e1009630
Author(s):  
Deyanira Pérez-Morales ◽  
Jessica Nava-Galeana ◽  
Roberto Rosales-Reyes ◽  
Paige Teehan ◽  
Helen Yakhnin ◽  
...  
Keyword(s):  
Regulatory Network ◽  
Regulatory Networks ◽  
Rna Binding ◽  
Positive Control ◽  
Negative Control ◽  
Intestinal Colonization ◽  
Protein Protein Interaction ◽  
Feedforward Loop ◽  
Regulatory Cascade ◽  
Cost Of Virulence

An intricate regulatory network controls the expression of Salmonella virulence genes. The transcriptional regulator HilD plays a central role in this network by controlling the expression of tens of genes mainly required for intestinal colonization. Accordingly, the expression of HilD is highly regulated by multiple factors, such as the SirA/BarA two-component system and the Hcp-like protein HilE. SirA/BarA positively regulates translation of hilD mRNA through a regulatory cascade involving the small RNAs CsrB and CsrC, and the RNA-binding protein CsrA, whereas HilE inhibits HilD activity by protein-protein interaction. In this study, we show that SirA/BarA also positively regulates translation of hilE mRNA through the same mentioned regulatory cascade. Thus, our results reveal a paradoxical regulation exerted by SirA/BarA-Csr on HilD, which involves simultaneous opposite effects, direct positive control and indirect negative control through HilE. This kind of regulation is called an incoherent type-1 feedforward loop (I1-FFL), which is a motif present in certain regulatory networks and represents a complex biological problem to decipher. Interestingly, our results, together with those from a previous study, indicate that HilE, the repressor component of the I1-FFL reported here (I1-FFLSirA/BarA-HilE-HilD), is required to reduce the growth cost imposed by the expression of the genes regulated by HilD. Moreover, we and others found that HilE is necessary for successful intestinal colonization by Salmonella. Thus, these findings support that I1-FFLSirA/BarA-HilE-HilD cooperates to control the precise amount and activity of HilD, for an appropriate balance between the growth cost and the virulence benefit generated by the expression of the genes induced by this regulator. I1-FFLSirA/BarA-HilE-HilD represents a complex regulatory I1-FFL that involves multiple regulators acting at distinct levels of gene expression, as well as showing different connections to the rest of the regulatory network governing Salmonella virulence.

scholarly journals Aktivitas Antibakteri Ekstrak Daun Sirsak (Annona muricata L.) Terhadap Pertumbuhan Bakteri Pseudomonas aeruginosa Secara In Vitro (ANTIBACTERIAL ACTIVITY OF SOURSOP (ANNONA MURICATA) LEAF EXTRACT ON GROWTH OF BACTERIA PSEUDOMONAS AERUGINOSA IN VITRO)

2019 ◽  
Vol 20 (3) ◽  
pp. 384
Author(s):  
Faisal Fikri ◽  
Imas Hapsari Rahmaningtyas ◽  
Ragil Angga Prastiya ◽  
Muhammad Thohawi Elziyad Purnama
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Bacterial Growth ◽  
Leaf Extract ◽  
Inhibition Zone ◽  
Positive Control ◽  
Negative Control ◽  
Annona Muricata ◽  
Bacterial Growth Inhibition

The aim of this study was to measure antibacterial activity of soursop leaf extract (Annona muricata L.) on bacterial growth inhibition of Pseudomonas aeruginosa by diffuse disc method. The result of the inhibition zone was analyzed using Analysis of Variance and followed using Duncan test, to show highly significantly different (p<0.01). The inhibition number of negative control (C-) was 0.00e±0.00 and the positive control (C+) was 31.31a±0.57. The result of concentration 1 (T1) was 14.49b±4.96; concentration 2 (T2) 8.98c±1.29; concentration 3 (T3) 5.84cd±1.85; concentration 4 (T4) 5.56cd±1.58; concentration 5 (T5) 2.85de±0.28; concentration 6 (T6) 2.98de±0.53; concentration 7 (T7) 2.82de±1.59; concentration 8 (T8) 2.41de±1.10; concentration 9 (T9) 2.20de±0.34; concentration 10 (T10) 1.10e±0.19; and concentration 11 (T11) 0.00e±0.00. The increase of soursop leaf extract concentration showed high inhibition diameter of bacterial growth. It concluded that soursop leaf extract have an antibacterial activity to inhibit P. aeruginosa growth with Minimal Inhibitory Concentration (MIC) 125 ppm.

Sign in / Sign up

Export Citation Format

Share Document