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1.
Artículo en Inglés | MEDLINE | ID: mdl-37998317

RESUMEN

The global COVID-19 pandemic presented not only challenges for services but also opportunities for reflection and change. This study aimed to understand young people, parents/carers, and professionals' experiences of remote provision across a voluntary sector organization to inform the nature of future delivery. Reflections from professionals (n = 7), young people (n = 7), and parents/carers (n = 2) were collected through semi-structured interviews and focus groups. Data were thematically analysed. Five overarching themes were identified: 'Accessibility', 'Remote therapeutic experiences', 'Translating to online', 'Spaces of comfort/discomfort', and 'Moving towards hybrid provision'. The COVID-19 pandemic changed service provision, notably with accelerated digitalisation. Although the service became more accessible, the digitalisation of services impacted the relational experiences for young people. Nevertheless, online provision was described as a 'steppingstone', allowing young people to engage in online therapy or group programmes before transferring to in-person provision. Although remote provision can lead to improvements in young people's mental health, this format was not suitable for all. When considering future models of provision, assessing needs, preferences, and access to private space and hardware are all important considerations when deciding which format to use to achieve the best possible outcomes.


Asunto(s)
COVID-19 , Salud Mental , Humanos , Adolescente , Pandemias , Grupos de Población , Grupos Focales , COVID-19/epidemiología
4.
Pathogens ; 12(8)2023 Jul 31.
Artículo en Inglés | MEDLINE | ID: mdl-37623962

RESUMEN

Colibacillosis, caused by avian pathogenic Escherichia coli (APEC), is an important infectious disease in chickens and a major cause of mortality in young chicks. Therefore, protecting young chickens from colibacillosis is important for improving welfare and productivity in the poultry industry. Recently, we developed a novel enterobactin (Ent) conjugate vaccine that could induce high titers of anti-Ent immunoglobulin Y (IgY) in chicken serum and consequently mitigate the organ lesions caused by APEC infection. Considering that maternal immunization is a practical approach to confer instant immune protection to the hatchlings, in this study, we immunized breeder hens with the Ent conjugate vaccine and evaluated the maternal immune protection on the progenies challenged with APEC. Three doses of the vaccine induced high titers of anti-Ent IgY in the hens (about 16- and 64-fold higher than the control group in the sera and egg yolks, respectively), resulting in an eight-fold of increase in anti-Ent IgY in the sera of progenies. However, the anti-Ent maternal immunity did not display significant protection against APEC challenge in the young chicks as there was no significant difference in APEC load (in liver, lung, and spleen) or organ lesions (in heart, liver, spleen, lung, and air sac) between the vaccinated and control groups. In future studies, the APEC infection model needs to be optimized to exhibit proper pathogenicity of APEC, and the maternal immunization regimen can be further improved to boost the maternally derived anti-Ent IgY in the hatchlings.

5.
Vaccine ; 41(4): 930-937, 2023 Jan 23.
Artículo en Inglés | MEDLINE | ID: mdl-36585279

RESUMEN

Colibacillosis is one of the most common and economically devastating infectious diseases in poultry production worldwide. Innovative universal vaccines are urgently needed to protect chickens from the infections caused by genetically diverse avian pathogenic Escherichia coli (APEC). Enterobactin (Ent) is a highly conserved siderophore required for E. coli iron acquisition and pathogenesis. The Ent-specific antibodies induced by a novel Ent conjugate vaccine significantly inhibited the in vitro growth of diverse APEC strains. In this study, White Leghorn chickens were immunized with the Ent conjugate vaccine using a crossed design with two variables, vaccination (with or without) and APEC challenge (O1, O78, or PBS control), resulting in six study groups (9 to 10 birds/group). The chickens were subcutaneously injected with the vaccine (100 µg per bird) at 7 days of age, followed by booster immunization at 21 days of age. The chickens were intratracheally challenged with an APEC strain (108 CFU/bird) or PBS at 28 days of age. At 5 days post infection, all chickens were euthanized to examine lesions and APEC colonization of the major organs. Immunization of chickens with the Ent vaccine elicited a strong immune response with a 64-fold increase in the level of Ent-specific IgY in serum. The hypervirulent strain O78 caused extensive lesions in lung, air sac, heart, liver, and spleen with significantly reduced lesion scores observed in the vaccinated chickens. Interestingly, the vaccination did not significantly reduce APEC levels in the examined organs. The APEC O1 with low virulence only caused sporadic lesions in the organs in both vaccination and control groups. The Ent conjugate vaccine altered the bacterial community of the ileum and cecum. Taken together, the findings from this study showed the Ent conjugate vaccine could trigger a strong specific immune response and was promising to confer protection against APEC infection.


Asunto(s)
Infecciones por Escherichia coli , Vacunas contra Escherichia coli , Enfermedades de las Aves de Corral , Animales , Escherichia coli , Pollos , Vacunas Conjugadas , Enterobactina , Infecciones por Escherichia coli/prevención & control , Infecciones por Escherichia coli/veterinaria
6.
PLoS One ; 17(12): e0279206, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36534660

RESUMEN

Avian pathogenic Escherichia coli (APEC) is the etiological agent of avian colibacillosis, a leading cause of economic loss to the poultry industry worldwide. APEC causes disease using a diverse repertoire of virulence factors and has the ability to form biofilms, which contributes to the survival and persistence of APEC in harsh environments. The objective of this study was to identify genes most widespread and important in APEC that contribute to APEC biofilm formation. Using the characterized APEC O18 as the template strain, a total of 15,660 mutants were randomly generated using signature tagged mutagenesis and evaluated for decreased biofilm formation ability using the crystal violet assay. Biofilm deficient mutants were sequenced, and a total of 547 putative biofilm formation genes were identified. Thirty of these genes were analyzed by PCR for prevalence among 109 APEC isolates and 104 avian fecal E. coli (AFEC) isolates, resulting in nine genes with significantly greater prevalence in APEC than AFEC. The expression of these genes was evaluated in the wild-type APEC O18 strain using quantitative real-time PCR (qPCR) in both the exponential growth phase and the mature biofilm phase. To investigate the role of these genes in biofilm formation, isogenic mutants were constructed and evaluated for their biofilm production and planktonic growth abilities. Four of the mutants (rfaY, rfaI, and two uncharacterized genes) displayed significantly decreased biofilm formation, and of those four, one (rfaI) displayed significantly decreased growth compared to the wild type. Overall, this study identified novel genes that may be important in APEC and its biofilm formation. The data generated from this study will benefit further investigation into the mechanisms of APEC biofilm formation.


Asunto(s)
Infecciones por Escherichia coli , Proteínas de Escherichia coli , Enfermedades de las Aves de Corral , Animales , Escherichia coli/genética , Proteínas de Escherichia coli/genética , Virulencia/genética , Pollos/genética , Infecciones por Escherichia coli/epidemiología , Factores de Virulencia/genética , Biopelículas , Reacción en Cadena en Tiempo Real de la Polimerasa , Enfermedades de las Aves de Corral/epidemiología
7.
BMC Health Serv Res ; 22(1): 1350, 2022 Nov 14.
Artículo en Inglés | MEDLINE | ID: mdl-36376847

RESUMEN

BACKGROUND: The global COVID-19 pandemic necessitated rapid adoption of remote provision across child and adolescent mental health services (CAMHS). The study aimed to understand young people's, parents'/carers', and professionals' experiences of remote provision across CAMHS in one NHS Trust in the North West of England to inform future recovery practice so that remote sessions can continue where they have been well received but re-thought or replaced where they have not. METHODS: The study sample comprised three groups: (i) young people, (ii) parents/carers, and (iii) clinical staff. Semi-structured interviews and focus groups were used to collect data. Data were analysed using thematic analysis. RESULTS: Three overarching themes were identified: 'Remote therapeutic experiences'; 'Spaces and places of therapy'; and 'Future of CAMHS'. Although remote appointments increased flexibility within the service, the quality of the relational experience was altered, typically for the worse. Clinicians felt less able to examine vital forms of non-verbal communication, which were considered instrumental in assessing and engaging people experiencing difficulties, leaving some questioning their professionalism. Although some young people suggested that remote provision increased comfort levels, others felt their place of comfort and safety was invaded. CONCLUSIONS: Reduced travel time for both clinicians and families may increase capacity, enabling the service to meet the increased demand if clinical effectiveness can be preserved. In considering future models of provision, assessing clinical need, patient and family preference, and access to space and hardware are all critical when deciding which modality to use for the best outcomes for each individual.


Asunto(s)
Servicios de Salud del Adolescente , COVID-19 , Servicios de Salud Mental , Humanos , Adolescente , Niño , Pandemias , COVID-19/epidemiología , Padres/psicología
9.
Am J Vet Res ; 83(9)2022 08 13.
Artículo en Inglés | MEDLINE | ID: mdl-35947681
10.
BMC Health Serv Res ; 22(1): 383, 2022 Mar 23.
Artículo en Inglés | MEDLINE | ID: mdl-35321699

RESUMEN

BACKGROUND: The present evaluation explored young people's, parents/carers, and healthcare professionals' perceptions of the Youth Information, Advice and Counselling (YIAC) model operated by a voluntary sector organisation in North West England. With an aim to understand the key components that contribute to enhancing the success of the YIAC model. METHOD: Semi-structured interviews and focus groups with young people, parents/carers, and healthcare professionals were conducted. Data were analysed using thematic analysis. RESULTS: Five main themes were identified from the data: 1) Accessibility and flexibility; 2) Non-clinical model and environment; 3) Staff; 4) Partnership working; and 5) Promotion of positive mental health and wellbeing. CONCLUSION: Findings highlight the importance of non-clinical, community-based, 'one-stop-shop' hubs for young people in disadvantaged areas. The key components highlighted as facilitating access and engagement include: opportunity to self-refer, choice of location, timely provision of support, non-clinical environment, age appropriate services, a non-hierarchical workforce, inclusive support for family and carers, a focus on wider, often social, issues, and collaboration with partner organisations. These findings suggest that early support hubs for young people's mental health should have consistent, long-term funding and should exist in every local area.


Asunto(s)
Cuidadores , Padres , Adolescente , Cuidadores/psicología , Consejo , Humanos , Organizaciones , Padres/psicología , Poblaciones Vulnerables
11.
Sci Rep ; 12(1): 2444, 2022 02 14.
Artículo en Inglés | MEDLINE | ID: mdl-35165318

RESUMEN

Cell cycle associated protein 1 (Caprin1) is an RNA-binding protein that can regulate the cellular post-transcriptional response to stress. It is a component of both stress granules and neuronal RNA granules and is implicated in neurodegenerative disease, synaptic plasticity and long-term memory formation. Our previous work suggested that Caprin1 also plays a role in the response of the cochlea to stress. Here, targeted inner ear-deletion of Caprin1 in mice leads to an early onset, progressive hearing loss. Auditory brainstem responses from Caprin1-deficient mice show reduced thresholds, with a significant reduction in wave-I amplitudes compared to wildtype. Whilst hair cell structure and numbers were normal, the inner hair cell-spiral ganglion neuron (IHC-SGN) synapse revealed abnormally large post-synaptic GluA2 receptor puncta, a defect consistent with the observed wave-I reduction. Unlike wildtype mice, mild-noise-induced hearing threshold shifts in Caprin1-deficient mice did not recover. Oxidative stress triggered TIA-1/HuR-positive stress granule formation in ex-vivo cochlear explants from Caprin1-deficient mice, showing that stress granules could still be induced. Taken together, these findings suggest that Caprin1 plays a key role in maintenance of auditory function, where it regulates the normal status of the IHC-SGN synapse.


Asunto(s)
Proteínas de Ciclo Celular/genética , Eliminación de Gen , Pérdida Auditiva Provocada por Ruido/genética , Ruido/efectos adversos , Proteínas de Unión al ARN/genética , Animales , Umbral Auditivo , Proteínas de Ciclo Celular/metabolismo , Potenciales Evocados Auditivos del Tronco Encefálico/genética , Femenino , Genotipo , Células Ciliadas Auditivas Internas/metabolismo , Audición/genética , Pérdida Auditiva Provocada por Ruido/metabolismo , Masculino , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Proteínas de Unión al ARN/metabolismo , Transducción de Señal/genética , Ganglio Espiral de la Cóclea/metabolismo , Sinapsis/metabolismo
12.
Dimens Crit Care Nurs ; 41(2): 76-82, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35099153

RESUMEN

BACKGROUND AND RELEVANCE: Early recognition of delirium mobilizes nurses to intervene in a timely manner to minimize cognitive, physical, and mental health burdens. The life-altering challenges of unrecognized delirium in intensive care unit (ICU) patients motivated a group of Massachusetts ICU nurse leaders to form a collaborative and improve delirium screening accuracy in 4 area hospitals. LOCAL PROBLEM: Baseline audits confirmed a lack of delirium screening accuracy across multiple institutions. The purpose of this article is to describe how our collaborative was developed and to outline our delirium accuracy assessment program. METHODS: In March of 2015, 2 graduates from the Clinical Scene Investigator Academy contacted members within the Boston cohort to form a regional collaborative to improve patient outcomes. The purpose of our project was to improve our delirium assessment accuracy to greater than 80% in patients across our ICUs. Using a successful project, we scaled this work based on the needs of each institution. A preaudit-postaudit design was used to evaluate the effectiveness of our programs. RESULTS: Data showed an improved overall accuracy assessment of 88.3% (P < .01), whereas the patients with an altered Richmond Agitation Sedation Scale markedly improved to 87.7% (P < .01). CONCLUSIONS: Every ICU in the United States is working on improving reportable quality metrics, but all too often, this work is being done in silos. When critical care nurses have the knowledge, skills, and time to work together, they can begin to transform health care.


Asunto(s)
Delirio , Enfermeras y Enfermeros , Cuidados Críticos , Delirio/diagnóstico , Hospitales , Humanos , Unidades de Cuidados Intensivos
13.
Artículo en Inglés | MEDLINE | ID: mdl-34790885

RESUMEN

Disability is an important and often overlooked component of diversity. Individuals with disabilities bring a rare perspective to science, technology, engineering, mathematics, and medicine (STEMM) because of their unique experiences approaching complex issues related to health and disability, navigating the healthcare system, creatively solving problems unfamiliar to many individuals without disabilities, managing time and resources that are limited by physical or mental constraints, and advocating for themselves and others in the disabled community. Yet, individuals with disabilities are underrepresented in STEMM. Professional organizations can address this underrepresentation by recruiting individuals with disabilities for leadership opportunities, easing financial burdens, providing equal access, fostering peer-mentor groups, and establishing a culture of equity and inclusion spanning all facets of diversity. We are a group of deaf and hard-of-hearing (D/HH) engineers, scientists, and clinicians, most of whom are active in clinical practice and/or auditory research. We have worked within our professional societies to improve access and inclusion for D/HH individuals and others with disabilities. We describe how different models of disability inform our understanding of disability as a form of diversity. We address heterogeneity within disabled communities, including intersectionality between disability and other forms of diversity. We highlight how the Association for Research in Otolaryngology has supported our efforts to reduce ableism and promote access and inclusion for D/HH individuals. We also discuss future directions and challenges. The tools and approaches discussed here can be applied by other professional organizations to include individuals with all forms of diversity in STEMM.

14.
Microbiol Resour Announc ; 10(38): e0083221, 2021 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-34554001

RESUMEN

Neonatal meningitis Escherichia coli (NMEC) is the second leading cause of sepsis and meningitis in neonates worldwide. Here, we report the genome sequence of NMEC15, belonging to serotype O18:K1, isolated from the cerebrospinal fluid (CSF) of an infant with neonatal bacterial meningitis (NBM) in the Netherlands.

15.
Front Microbiol ; 12: 659613, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33959114

RESUMEN

Colisitin-associated resistance in bacteria of food producing animals has gained significant attention with the mcr gene being linked with resistance. Recently, newer variants of mcr have emerged with more than nine variants currently recognized. Reports of mcr associated resistance in Escherichia coli of poultry appear to be relatively limited, but its prevalence requires assessment since poultry is one of the most important and cheapest sources of the world's protein and the emergence of resistance could limit our ability to treat disease outbreaks. Here, 107 E. coli isolates from production poultry were screened for the presence of mcr 1-9. The isolates were collected between April 2015 and June 2016 from broiler chickens and free-range layer hens in Rio de Janeiro, Brazil. All isolates were recovered from the trachea and cloaca of healthy birds and an additional two isolates were recovered from sick birds diagnosed with colibacillosis. All isolates were screened for the presence of mcr-1 to 9 using PCR and Sanger sequencing for confirmation of positive genes. Additionally, pulse field gel electrophoresis (PFGE) analysis, avian fecal E. coli (APEC) virulence associated gene screening, plasmid replicon typing and antimicrobial resistance phenotype and resistance gene screening, were also carried out to further characterize these isolates. The mcr-1 gene was detected in 62 (57.9%) isolates (61 healthy and 1 APEC) and the mcr-5 gene was detected in 3 (2.8%) isolates; mcr-2, mcr-3, mcr-4, mcr-6, mcr-7, mcr-8, and mcr-9 were not detected in any isolate. In addition, mcr 1 and 5 positive isolates were phenotypically resistant to colistin using the agar dilution assay (> 8ug/ml). PFGE analysis found that most of the isolates screened had unique fingerprints suggesting that the emergence of colistin resistance was not the result of clonal dissemination. Plasmid replicon types IncI2, FIB, and B/O were found in 38, 36, and 34% of the mcr positive isolates and were the most prevalent replicon types detected; tetA and tetB (32 and 26%, respectively) were the most prevalent antimicrobial resistance genes detected and iutA, was the most prevalent APEC virulence associated gene, detected in 50% of the isolates. Approximately 32% of the isolates examined could be classified as APEC-like, based on the presence of 3 or more genes of APEC virulence associated path panel (iroN, ompT, hlyF, iss, iutA). This study has identified a high prevalence of mcr-1 in poultry isolates in Brazil, suggesting that animal husbandry practices could result in a potential source of resistance to the human food chain in countries where application of colistin in animal health is practiced. Emergence of the mcr gene and associated colisitin resistance in production poultry warrants continued monitoring from the animal health and human health perspective.

16.
Front Immunol ; 12: 629480, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33868248

RESUMEN

Passive immunization with specific egg yolk antibodies (immunoglobulin Y, IgY) is emerging as a promising alternative to antibiotics to control bacterial infections. Recently, we developed a novel conjugate vaccine that could trigger a strong immune response in rabbits directed against enterobactin (Ent), a highly conserved siderophore molecule utilized by different Gram-negative pathogens. However, induction of Ent-specific antibodies appeared to be affected by the choice of animal host and vaccination regimen. It is still unknown if the Ent conjugate vaccine can trigger a specific immune response in layers for the purpose of production of anti-Ent egg yolk IgY. In this study, three chicken vaccination trials with different regimens were performed to determine conditions for efficient production of anti-Ent egg yolk IgY. Purified Ent was conjugated to three carrier proteins, keyhole limpet hemocyanin (KLH), bovine serum albumin (BSA) and CmeC (a subunit vaccine candidate), respectively. Intramuscular immunization of Barred Rock layers with KLH-Ent conjugate four times induced strong immune response against whole conjugate vaccine but the titer of Ent-specific IgY did not change in yolk with only a 4 fold increase detected in serum. In the second trial, three different Ent conjugate vaccines were evaluated in Rhode Island Red pullets with four subcutaneous injections. The KLH-Ent or CmeC-Ent conjugate consistently induced high level of Ent-specific IgY in both serum (up to 2,048 fold) and yolk (up to 1,024 fold) in each individual chicken. However, the Ent-specific immune response was only temporarily and moderately induced using a BSA-Ent vaccination. In the third trial, ten White Leghorn layers were subcutaneously immunized three times with KLH-Ent, leading to consistent and strong immune response against both whole conjugate and the Ent molecule in each chicken; the mean titer of Ent-specific IgY increased approximately 32 and 256 fold in serum and yolk, respectively. Consistent with its potent binding to various Ent derivatives, the Ent-specific egg yolk IgY also inhibited in vitro growth of a representative Escherichia coli strain. Together, this study demonstrated that the novel Ent conjugate vaccine could induce strong, specific, and robust immune response in chickens. The Ent-specific hyperimmune egg yolk IgY has potential for passive immune intervention against Gram-negative infections.


Asunto(s)
Anticuerpos Antibacterianos/sangre , Vacunas Bacterianas/farmacología , Proteínas del Huevo/inmunología , Yema de Huevo/inmunología , Enterobactina/farmacología , Escherichia coli/efectos de los fármacos , Inmunogenicidad Vacunal , Inmunoglobulinas/sangre , Animales , Vacunas Bacterianas/inmunología , Pollos , Enterobactina/inmunología , Escherichia coli/crecimiento & desarrollo , Escherichia coli/inmunología , Estudios de Factibilidad , Inmunización , Vacunas Conjugadas/inmunología , Vacunas Conjugadas/farmacología , Vacunas de Subunidad/inmunología , Vacunas de Subunidad/farmacología
17.
PeerJ ; 9: e11025, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33717713

RESUMEN

Colibacillosis caused by avian pathogenic Escherichia coli (APEC) is a devastating disease of poultry that results in multi-million-dollar losses annually to the poultry industry. Disease syndromes associated with APEC includes colisepticemia, cellulitis, air sac disease, peritonitis, salpingitis, omphalitis, and osteomyelitis among others. A total of 61 APEC isolates collected during the Fall of 2018 (Aug-Dec) from submitted diagnostic cases of poultry diagnosed with colibacillosis were assessed for the presence of 44 virulence-associated genes, 24 antimicrobial resistance genes and 17 plasmid replicon types. Each isolate was also screened for its ability to form biofilm using the crystal violet assay and antimicrobial susceptibility to 14 antimicrobials using the NARMS panel. Overall, the prevalence of virulence genes ranged from 1.6% to >90% with almost all strains harboring genes that are associated with the ColV plasmid-the defining trait of the APEC pathotype. Overall, 58 strains were able to form biofilms and only three strains formed negligible biofilms. Forty isolates displayed resistance to antimicrobials of the NARMS panel ranging from one to nine agents. This study highlights that current APEC causing disease in poultry possess virulence and resistance traits and form biofilms which could potentially lead to challenges in colibacillosis control.

18.
PeerJ ; 9: e12631, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-35003930

RESUMEN

Avian pathogenic E. coli is the causative agent of extra-intestinal infections in birds known as colibacillosis, which can manifest as localized or systemic infections. The disease affects all stages of poultry production, resulting in economic losses that occur due to morbidity, carcass condemnation and increased mortality of the birds. APEC strains have a diverse virulence trait repertoire, which includes virulence factors involved in adherence to and invasion of the host cells, serum resistance factors, and toxins. However, the pathogenesis of APEC infections remains to be fully elucidated. The Type 6 secretion (T6SS) system has recently gained attention due to its role in the infection process and protection of bacteria from host defenses in human and animal pathogens. Previous work has shown that T6SS components are involved in the adherence to and invasion of host cells, as well as in the formation of biofilm, and intramacrophage bacterial replication. Here, we analyzed the frequency of T6SS genes hcp, impK, evpB, vasK and icmF in a collection of APEC strains and their potential role in virulence-associated phenotypes of APECO18. The T6SS genes were found to be significantly more prevalent in APEC than in fecal E. coli isolates from healthy birds. Expression of T6SS genes was analyzed in culture media and upon contact with host cells. Mutants were generated for hcp, impK, evpB, and icmF and characterized for their impact on virulence-associated phenotypes, including adherence to and invasion of host model cells, and resistance to predation by Dictyostelium discoideum. Deletion of the aforementioned genes did not significantly affect adherence and invasion capabilities of APECO18. Deletion of hcp reduced resistance of APECO18 to predation by D. discoideum, suggesting that T6SS is involved in the virulence of APECO18.

19.
Environ Microbiol ; 23(3): 1496-1509, 2021 03.
Artículo en Inglés | MEDLINE | ID: mdl-33325149

RESUMEN

Most Escherichia coli (E. coli) strains do not cause disease, naturally living in the lower intestine and is expelled into the environment within faecal matter. Escherichia coli can utilize citrate under anaerobic conditions but not aerobic conditions. However, the underlying regulatory mechanisms are poorly understood. In this study, we explored regulatory mechanisms of citrate fermentation genes by global regulators ArcA and Fnr under anaerobic conditions. A gel mobility shift assay showed that the regulator proteins ArcA and Fnr binded to the promoter region localized between the citAB and citCDEFXGT operons. Subsequent assays confirmed that ArcA indirectly controled the expression of citrate fermentation genes via regulating CitA-CitB system, while Fnr directly regulated but also indirectly modulated citrate fermentation genes via controling CitA-CitB system. Deletions of arcA and fnr significantly reduced the growth of Escherichia coli in M9 medium with a citrate carbon source. We conclude that both ArcA and Fnr can indirectly control the citrate utilization via CitA-CitB system, while Fnr can also directly regulate the expression of citrate fermentation genes in E. coli under anaerobic conditions.


Asunto(s)
Proteínas de Escherichia coli , Proteínas Hierro-Azufre , Anaerobiosis , Proteínas de la Membrana Bacteriana Externa/metabolismo , Proteínas Bacterianas/metabolismo , Citratos , Ácido Cítrico , Escherichia coli/genética , Escherichia coli/metabolismo , Proteínas de Escherichia coli/genética , Proteínas de Escherichia coli/metabolismo , Regulación Bacteriana de la Expresión Génica , Proteínas Hierro-Azufre/metabolismo , Proteínas Represoras/metabolismo
20.
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