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Rodriguez-Ruiz E, van Mol MMC, Latour JM, Fuest K. Caring to care: Nurturing ICU healthcare professionals' wellbeing for enhanced patient safety. Med Intensiva 2024:S2173-5727(24)00061-4. [PMID: 38594110 DOI: 10.1016/j.medine.2024.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 02/28/2024] [Indexed: 04/11/2024]
Abstract
Healthcare professionals working in the Intensive Care Unit (ICU) care for patients suffering from a critical illness and their relatives. Working within a team of people with different personalities, competencies, and specialties, with constraints and demands might contribute to a working environment that is prone to conflicts and disagreements. This highlights that the ICU is a stressful place that can threaten healthcare professionals' wellbeing. This article aims to address the concept of wellbeing by describing how the stressful ICU work-environment threatens the wellbeing of health professionals and discussing how this situation jeopardizes patient safety. To promote wellbeing, it is imperative to explore actionable interventions such as improve communication skills, educational sessions on stress management, or mindfulness. Promoting ICU healthcare professionals' wellbeing through evidence-based strategies will not only increase their personal resilience but might contribute to a safer and more efficient patient care.
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Affiliation(s)
- Emilio Rodriguez-Ruiz
- Intensive Care Medicine Department, University Clinic Hospital of Santiago de Compostela (CHUS), Galician Public Health System (SERGAS), Santiago de Compostela, Spain; Simulation, Life Support & Intensive Care Research Unit of Santiago de Compostela (SICRUS), Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain; CLINURSID Research Group, University of Santiago de Compostela, Santiago de Compostela, Spain.
| | | | - Joseph Maria Latour
- School of Nursing and Midwifery, Faculty of Health, University of Plymouth, Plymouth, UK; Curtin School of Nursing, Curtin University, Perth, Australia; Department of Nursing, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Kristina Fuest
- Technical University of Munich, School of Medicine, Department of Anesthesiology and Intensive Care Medicine, Ismaninger Str. 22, 81675 Munich, Germany
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Goldsworthy S, Latour JM, Palmer S, McNair H, Cramp M. Identifying core components of a radiotherapy comfort intervention package using nominal group technique. Radiography (Lond) 2023; 29:926-934. [PMID: 37499585 DOI: 10.1016/j.radi.2023.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 07/05/2023] [Accepted: 07/11/2023] [Indexed: 07/29/2023]
Abstract
INTRODUCTION A comfortable treatment position in radiotherapy may promote patient stability and improve outcomes such as accuracy. The aim of this study was to identify, prioritise and determine the feasibility of delivery of intervention components as part of a radiotherapy comfort intervention package. METHODS Prior research, consisting of a systematic review and qualitative interviews with patient and therapeutic radiographers, was triangulated and 15 intervention components developed. An online nominal group technique consensus meeting with 7 patients who received radiotherapy exceeding 10 min for one of three anatomical cancer sites and 3 therapeutic radiographers (TRs) participated. Four activities were undertaken: 1) discussion of comfort intervention components; 2) initial vote; 3) prioritisation of intervention components; and 4) discussion of feasibility in radiotherapy and were analysed using established quantitative and qualitative methods. RESULTS One intervention component was added from initial discussions to the 15 pre-determined components being discussed. 11 components were recommended as 'accepted' (n = 5) or 'accepted with caution' (n = 6) to proceed to development. The highest scoring intervention components were 'Compassionate & empathetic communication training for TRs' and 'Tailored information, e.g., TRs provide the required information only as part of preparation for treatment'. Anther that followed closely was 'Adjustments & supports provided for arms or legs during treatment by TRs'. Those 'accepted with caution' included 'Soft pads/mattress under the body to alleviate body discomfort managed by TRs'. Qualitative analysis highlighted concerns over the radiation environment and emphasised the importance of resources such as equipment, training, and time. CONCLUSION The recommended comfort interventions have potential to improve patient comfort during radiotherapy and should be considered to incorporate into positioning and immobilisation guidelines. However, specific intervention strategies to address these components will need to be developed and robustly evaluated. IMPLICATIONS FOR PRACTICE Comfort interventions might help patients relax and stay still during treatment, which could improve treatment accuracy and efficacy. Introducing these comfort interventions in practice have potential to lead to a more positive patient experience and improved overall quality of care during radiotherapy.
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Affiliation(s)
- S Goldsworthy
- Beacon Radiotherapy, Musgrove Park Hospital, Somerset NHS Foundation Trust, Taunton, United Kingdom; Faculty of Health and Applied Sciences, University of the West of England, Bristol, United Kingdom.
| | - J M Latour
- Faculty of Health, University of Plymouth, Plymouth, United Kingdom; School of Nursing, Midwifery and Paramedicine, Faculty of Health Sciences, Curtin University, Perth, Australia
| | - S Palmer
- School of Healthcare Sciences, Cardiff University, Cardiff, United Kingdom
| | - H McNair
- Royal Marsden NHS Foundation Trust and Institute of Cancer Research, Sutton, United Kingdom
| | - M Cramp
- Faculty of Health and Applied Sciences, University of the West of England, Bristol, United Kingdom
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Fiori M, Coombs M, Endacott R, Cutello CA, Latour JM. The meaning of CPR in the life-world of hospital: perspectives of patients who witnessed CPR and healthcare professionals. Eur J Cardiovasc Nurs 2022. [DOI: 10.1093/eurjcn/zvac060.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Other. Main funding source(s): Resuscitation Council (UK)
Background
Cardiopulmonary resuscitation (CPR) in hospital is a stressful experience for patients who witness it and for the healthcare professionals involved. Limited evidence and guidance exist regarding the experience of witnessing a fellow patient’s CPR. Informed by a systematic review [1] and a multi-stakeholder consultation [2], the WATCH (Witnessing an Attempt of CPR in Hospital) study has explored the lived experiences of hospital patients and healthcare professionals on patient-witnessed CPR with the primary aim of understanding the impact of such an experience [3].
Purpose
The purpose of this study was to understand the meaning of CPR in the context of the hospital life-world of patients who witness CPR and of healthcare professionals.
Methods
The WATCH study used a qualitative descriptive phenomenological design. The lived experiences of 16 witnessing patients admitted to nine clinical wards and of 20 healthcare professionals involved in CPR were explored through in-depth interviews and focus groups conducted in one hospital in the UK.
Results
Three themes were developed from analysis indicating that, despite a shared understanding of CPR as part of hospital life and as a potential result of emergencies, patients and healthcare professionals had different perspectives of hospital CPR. 1) Unfamiliarity vs Exposure: although patients were aware of CPR, witnessing CPR was often unexpected and traumatic, as many had not experienced it before. Instead, healthcare professionals with previous knowledge and expertise, held an emotional distance and focused on the clinical tasks of CPR. 2) Fiction vs Reality: healthcare professionals considered patients to have unrealistic expectations of CPR, often uninformed and influenced by distorted portrayal of CPR to the lay public through television. Patients acknowledged that witnessing hospital CPR helped their understanding of the reality of it, which differed from their initial idea. 3) Life vs Death: Patients felt disturbed by the presence of a dead body in their room after CPR, whilst daily activities of hospital life were carried out, highlighting a contrast between life and death in the same environment. Finally, healthcare professionals reflected on the meaning of performing CPR as a process to help the ones witnessing it to face and accept the reality of death.
Conclusion
The WATCH study highlighted that patients and healthcare professionals hold different perspectives of CPR in hospital. Awareness of different perspectives of hospital CPR will help healthcare professionals initiate CPR conversations with hospital patients. Education and accurate information should be offered to hospital patients around CPR to have realistic expectations. Further work is required to guide and support clinical practice around patient-witnessed CPR in hospital.
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Affiliation(s)
- M Fiori
- Edinburgh Napier University , Edinburgh , United Kingdom of Great Britain & Northern Ireland
| | - M Coombs
- Victoria University of Wellington, School of Nursing Midwifery and Health Practice , Wellington , New Zealand
| | - R Endacott
- National Institute for Health Research (NIHR) , London , United Kingdom of Great Britain & Northern Ireland
| | | | - J M Latour
- University of Plymouth , Plymouth , United Kingdom of Great Britain & Northern Ireland
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Legge AR, Latour JM, Nasser M. Older Patients' Views of Oral Health Care and Factors which Facilitate or Obstruct Regular Access to Dental Care-Services: A Qualitative Systematic Review. Community Dent Health 2021; 38:165-171. [PMID: 33661581 DOI: 10.1922/cdh_00326legge07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES Describe independently living older peoples' views of oral-health, and their experiences of accessing dental care-services within community settings. METHODS Dentistry and Oral-Sciences Source, CINAHL, MEDLINE and AMED databases were searched to 15 January 2020. Assessment of methodological quality was undertaken using the JBI Critical Appraisal Checklist. Extracted data underwent meta-aggregative synthesis; findings were assigned levels of credibility and categorised according to similarity. These categories were subsequently synthesised into themes. RESULTS Five studies were identified and included within analysis. Forty-six findings were aggregated into 18 descriptive categories, which were synthesised into five themes. These themes were Aggregated oral health experience; Taking responsibility for individual oral health; Practical issues related to accessing dental services; Negotiation of cost associated with care and Role of the dental professional. CONCLUSIONS Previous dental healthcare experiences influence older peoples' health perceptions and health-seeking behaviours. Dental service provision and the perceptions of dental professionals require adaptation to accommodate the needs of adults as they age. This includes provision of domiciliary services and nationally subsidised dental care.
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Affiliation(s)
- A R Legge
- Plymouth Community Dental Services, Plymouth Dental Access Centre, Plymouth, UK.,School of Dentistry, Faculty of Health, University of Plymouth, Plymouth, UK
| | - J M Latour
- School of Nursing and Midwifery, Faculty of Health, University of Plymouth, Plymouth, UK
| | - M Nasser
- School of Dentistry, Faculty of Health, University of Plymouth, Plymouth, UK
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Underwood F, Burrows L, Gegg R, Latour JM, Kent B. 139The Meaning Of Confidence For Older People Living With Frailty: A Systematic Review Of Qualitative Evidence. Age Ageing 2017. [DOI: 10.1093/ageing/afx068.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Dall'Oglio I, Portanova A, Tiozzo E, Gawronsk O, Rocco G, Latour JM. OC47 - NICUs and family-centred care, from the leadership to the design, the results of a survey in Italy (by FCC Italian NICU study group). Nurs Child Young People 2016; 28:86. [PMID: 27214462 DOI: 10.7748/ncyp.28.4.86.s78] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
UNLABELLED Theme: Leadership, management, nursing education. INTRODUCTION Family-centered care (FCC) in NICUs is related to staff culture and the organization of the unit. AIM To describe the organizational characteristics and services for families in Italian NICUs. METHODS This survey involved 105 NICUs in Italy. The Italian version of the 'FCC in the NICUs: A Self-Assessment Inventory' developed by the Institute for FCC was sent to the nurse managers in January 2015. RESULTS Forty-seven NICUs answered (49%). The means of the NICU characteristics are number of beds: 20; newborns discharged/year: 331, of which very low birth weight infant: 68; unit's rooms: 3.7). The total mean score of the 10 areas explored by questionnaire was 2.6 (on 5 points Likert scale) for the 'status' and of 2.3 (on 3 points scale) for priority for change. CONCLUSION The results show an organizational lack, but also the consciousness of the need of change. Sharing new organizational strategies could be an important issue for the future.
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Affiliation(s)
- Immacolata Dall'Oglio
- University of Rome 'Tor Vergata', Professional Development, Continuing Education and Nursing Research Service, Bambino Gesù Children's Hospital, IRCCS, Italy
| | - Anna Portanova
- Department of Medical and Surgical Neonatology, Bambino Gesù Children's Hospital, IRCCS, Italy
| | - Emanuela Tiozzo
- Professional Development, Continuing Education and Nursing Research Service, Bambino Gesù Children's Hospital, IRCCS, Italy
| | - Orsola Gawronsk
- University of Rome 'Tor Vergata', Professional Development, Continuing Education and Nursing Research Service, Bambino Gesù Children's Hospital, IRCCS, Italy
| | - Gennaro Rocco
- Centre of Excellence for Nursing Scholarship
- Ipasvi Rome Nursing College, Italy
| | - J M Latour
- Clinical Nursing, School of Nursing and Midwifery, Faculty of Health and Human Sciences Plymouth University, United Kingdom
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van Staa AL, Jedeloo S, van Meeteren J, Latour JM. Crossing the transition chasm: experiences and recommendations for improving transitional care of young adults, parents and providers. Child Care Health Dev 2011; 37:821-32. [PMID: 22007982 DOI: 10.1111/j.1365-2214.2011.01261.x] [Citation(s) in RCA: 177] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Transition from paediatric to adult healthcare has received little attention in the Netherlands. This study aimed to: (i) map experiences with the transfer to adult care of young adults with chronic conditions; and (ii) identify recommendations for transitional care of young adults, their parents and healthcare providers. METHODS Semi-structured interviews with 24 young adults after transfer (aged 15-22 years; diagnosed with haemophilia, diabetes mellitus, spina bifida, congenital heart disorders, cystic fibrosis, juvenile rheumatoid arthritis or sickle cell disease), 24 parents and 17 healthcare providers. Thematic analysis was performed. RESULTS Only the haemophilia department offered a structured transition programme, most patients had not been prepared for transition. Experiences and views of patients, parents and professionals mainly overlapped and were condensed into four core themes. Two are related to moving to adult care: (1) 'leaving paediatric care is a logical step'. Leaving familiar surroundings was harder for parents than for young adults who displayed a positive 'wait-and-see' attitude; and (2) 'transition is complicated by cultural gaps between paediatric and adult services'. Young adults and parents felt lost after transfer and recommended their peers 'to be alert and involved'. Providers also recognized the cultural chasm between both services and worried about non-compliance, lost to follow-up and lack of independence. Two other themes indicated priorities for improvement: (3) 'better patient and parent preparation' for differences between healthcare settings and for new roles and responsibilities with respect to self-management; and (4) 'more collaboration and personal links' between paediatric and adult care providers. CONCLUSIONS Action is required to cross the chasm between paediatric and adult-oriented care. Preparation for transition should start early and focus on strengthening adolescents' independency without undermining parental involvement. Building bridges between services, gaining trust and investing in new personal relations is a challenge for all parties involved: transition is about responding and bonding.
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Affiliation(s)
- A L van Staa
- Expertise Centre Transitions of Care, Rotterdam University, Rotterdam, The Netherlands.
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van Dijk M, Poley MJ, Gischler SJ, Mazer P, Ijsselstijn H, Tibboel D, Latour JM. Parental satisfaction with follow-up services for children with major anatomical congenital anomalies. Child Care Health Dev 2010; 36:101-9. [PMID: 19719767 DOI: 10.1111/j.1365-2214.2009.01014.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Since 1999 a multidisciplinary follow-up programme for parents and children with major anatomical congenital anomalies is in place in our hospital, run by a dedicated team. The aim of the present study was to evaluate the services of this team from a parental perspective. METHODS Parents completed a questionnaire including open and closed questions about satisfaction with the various professional disciplines involved in the follow-up, statements on usefulness of the follow-up services and suggestions for improvement. RESULTS Four hundred and sixty-nine surveys were sent out, of which 71% were returned. Non-responding parents included significantly more parents of non-Dutch origin (P= 0.038) and parents who never responded to invitations for follow-up examinations (P < 0.001). Parental satisfaction differed for the various disciplines. Eighty per cent of the parents were (very) satisfied with the social worker, compared with 92% with nurses. More than half of the parents agreed that the follow-up services give peace of mind. Almost a quarter of parents, however, considered the follow-up services as redundant. The children of these parents had significantly shorter intensive care unit stay (P= 0.02), were older at the time of the questionnaire (P= 0.04), of higher socio-economic status (P= 0.001) and less likely to be of non-Dutch origin (P= 0.008). Sixty-one per cent of the parents had contacted the 24-h helpline. Ninety per cent of the parents were satisfied with the intensive care unit, almost 80% with the general ward. CONCLUSION Overall, parents were satisfied with the services of the follow-up team. Some parents, however, saw room for improvement related to better communication, recognizability of the team and better planning and organization.
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Affiliation(s)
- M van Dijk
- Department of Pediatric Surgery, Erasmus MC-Sophia Children's Hospital, PO Box 2060, 3000 CB Rotterdam, The Netherlands.
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Fulbrook P, Latour JM, Albarran JW. Paediatric critical care nurses' attitudes and experiences of parental presence during cardiopulmonary resuscitation: a European survey. Int J Nurs Stud 2006; 44:1238-49. [PMID: 16836999 DOI: 10.1016/j.ijnurstu.2006.05.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2006] [Revised: 04/07/2006] [Accepted: 05/18/2006] [Indexed: 11/18/2022]
Abstract
BACKGROUND Although recent resuscitation guidelines are supportive of family presence during cardiopulmonary resuscitation literature from the last decade suggests that it is often discouraged, and the subject remains a controversial issue. OBJECTIVES To determine the experiences and attitudes of European paediatric critical care nurses about parental presence during the resuscitation of a child. DESIGN A survey design was employed. PARTICIPANTS A convenience sample of European paediatric critical care nurses was used. METHODS A structured questionnaire was used, which incorporated a series of attitude statements that were rated using a 5-point Likert scale. Differences in attitudes were explored in three areas: decision-making, processes and outcomes of resuscitation. RESULTS The results from this survey suggest that European paediatric nurses are very supportive of parental presence during cardiopulmonary resuscitation. Only a few nurses reported that their unit had a policy that covered parental presence during cardiopulmonary resuscitation and most nurses did not support the use of a dedicated nurse to look after the parents during resuscitation. CONCLUSIONS Compared with previous studies relating to adult cardiopulmonary resuscitation, paediatric nurses experience family member presence more frequently than adult critical care nurses and appear to be more supportive of relatives' presence. It is recommended that paediatric intensive care units establish local policies that cover parental presence during cardiopulmonary resuscitation.
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Affiliation(s)
- P Fulbrook
- School of Nursing and Midwifery, Australian Catholic University, Brisbane Campus, PO Box 456, Virginia, Qld 4014, Australia.
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Fulbrook P, Albarran JW, Latour JM. A European survey of critical care nurses’ attitudes and experiences of having family members present during cardiopulmonary resuscitation. Int J Nurs Stud 2005; 42:557-68. [PMID: 15921987 DOI: 10.1016/j.ijnurstu.2004.09.012] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2004] [Revised: 08/20/2004] [Accepted: 09/14/2004] [Indexed: 11/19/2022]
Abstract
This paper presents the results of a survey into the experiences and attitudes of 124 European critical care nurses to the presence of family members during cardiopulmonary resuscitation (CPR). Nurses from mainland Europe were less experienced and less sure about the consequences of relatives witnessing resuscitation than United Kingdom (UK) nurses. Generally, nurses supported the presence of family members, although UK nurses held significantly more positive attitudes than their non-UK counterparts in the areas of decision-making, processes and outcomes of resuscitation. Differences in attitudes are explored in the discussion. On the basis of results from this study, it is recommended that further policy guidance is required.
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Affiliation(s)
- P Fulbrook
- Institute of Health & Community Studies, Bournemouth University, UK
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Bucher C, Duval E, Barbe JM, Verpeaux JN, Amatore C, Guilard R, Le Pape L, Latour JM, Dahaoui S, Lecomte C. Synthesis, X-ray structure, electrochemical, and EPR studies of a pentacoordinated mn(II) tetramethylcyclam complex. Inorg Chem 2001; 40:5722-6. [PMID: 11599979 DOI: 10.1021/ic001472h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C Bucher
- LIMSAG, UMR 5633, Université de Bourgogne, Faculté des Sciences Gabriel, 6 Boulevard Gabriel, 21100 Dijon, France
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Belle C, Bougault C, Averbuch MT, Durif A, Pierre JL, Latour JM, Le Pape L. Paramagnetic NMR investigations of high-spin nickel(II) complexes. Controlled synthesis, structural, electronic, and magnetic properties of dinuclear vs. mononuclear species. J Am Chem Soc 2001; 123:8053-66. [PMID: 11506562 DOI: 10.1021/ja010342k] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New dissymmetric tertiary amines (N(3)SR) with varying N/S donor sets have been synthesized to provide mono- and dinuclear complexes. Acetate ions are used to complete the octahedral coordination sphere around nickel(II) atom(s). The facile conversion of mononuclear to dinuclear systems can be controlled to produce either mono- or dinuclear complexes from the same ligand. The dinuclear complex a(BPh(4))(2) ([Ni(2)(N(3)SSN(3))(OAc)(2)](BPh(4))(2)) has been characterized in the solid state by X-ray diffraction techniques as solvate: a(BPh(4))(2).(1/2)[5(CH(3)OH).(CH(3)CN).(CH(3)CH(2)OH)]. The two Ni atoms are six-coordinated and bridged by a disulfide group and two bidentate acetates. Magnetic susceptibility reveals a weak ferromagnetic exchange interaction between the two Ni atoms with J = 2.5(7) cm(-1). UV-vis studies suggest that the six-coordinated structure persists in solution. The (1)H NMR spectrum of a(BPh(4))(2) exhibits sharp significantly hyperfine shifted ligand signals. A complete assignment of resonances is accomplished by a combination of methods: 2D-COSY experiments, selective chemical substitution, and analysis of proton relaxation data. Proton isotropic hyperfine shifts are shown to originate mainly from contact interactions and to intrinsically contain a small J-magnetic coupling and/or zero-field splitting contribution. A temperature dependence study of longitudinal relaxation times indicates that a very unusual paramagnetic Curie dipolar mechanism is the dominant relaxation pathway in these weakly ferromagnetically spin-coupled dinickel(II) centers. The mononuclear nickel(II) analogue exhibits extremely broader (1)H NMR signals and only partial analysis could be performed. These data are consistent with a shortening of electronic relaxation times in homodinuclear compounds with respect to the corresponding mononuclear species.
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Affiliation(s)
- C Belle
- Laboratoire d'Etudes Dynamiques et Structurales de la Sélectivité (LEDSS, UMR CNRS 5616), Université Joseph Fourier, BP 53X, 38041 Grenoble Cedex 9, France.
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Gonzalez de Peredo A, Saint-Pierre C, Latour JM, Michaud-Soret I, Forest E. Conformational changes of the ferric uptake regulation protein upon metal activation and DNA binding; first evidence of structural homologies with the diphtheria toxin repressor. J Mol Biol 2001; 310:83-91. [PMID: 11419938 DOI: 10.1006/jmbi.2001.4769] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fur (ferric uptake regulation protein) is a bacterial global regulator that uses iron as a cofactor to bind to specific DNA sequences. It has been suggested that metal binding induces a conformational change in the protein, which is subsequently able to recognize DNA. This mechanism of activation has been investigated here using selective chemical modification monitored by mass spectrometry. The reactivity of each lysine residue of the Fur protein was studied, first in the apo form of the protein, then after metal activation and finally after DNA binding. Of particular interest is Lys76, which was shown to be highly protected from modification in the presence of target DNA. Hydrogen-deuterium exchange experiments were performed to map with higher resolution the conformational changes induced by metal binding. On the basis of these results, together with a secondary structure prediction, the presence in Fur of a non-classical helix-turn-helix motif is proposed. Experimental results show that activation upon metal binding induces conformational modification of this specific motif. The recognition helix, interacting directly with the major groove of the DNA, would include the domain [Y55-F61]. This helix would be followed by a small "wing" formed between two beta strands, containing Lys76, which might interact directly with DNA. These results suggest that Fur and DtxR (diphtheria toxin repressor), another bacterial repressor, share not only the function of being iron concentration regulators, and the structure of their DNA-binding domain.
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Affiliation(s)
- A Gonzalez de Peredo
- Laboratoire de Spectrométrie de Masse des Protéines, Institut de Biologie Structurale, (UMR 5075 CEA/CNRS/UJF), Grenoble Cedex 1, F-38027, France
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Torelli S, Belle C, Gautier-Luneau I, Pierre JL, Saint-Aman E, Latour JM, Le Pape L, Luneau D. pH-controlled change of the metal coordination in a dicopper(II) complex of the ligand H-BPMP: crystal structures, magnetic properties, and catecholase activity. Inorg Chem 2000; 39:3526-36. [PMID: 11196811 DOI: 10.1021/ic991450z] [Citation(s) in RCA: 218] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dinucleating ligand 2,6-bis[(bis(2-pyridylmethyl)amino)methyl]-4-methylphenol (H-BPMP) has been used to synthesize the three dinuclear Cu(II) complexes [Cu2(BPMP)(OH)][ClO4](2).0.5C4H8O (1), [Cu2(BPMP)(H2O)2](ClO4)(3).4H2O (2), and [Cu2(H-BPMP)][(ClO4)4].2CH3CN (3). X-ray diffraction studies reveal that 1 is a mu-hydroxo, mu-phenoxo complex, 2 a diaqua, mu-phenoxo complex, and 3 a binuclear complex with Cu-Cu distances of 2.96, 4.32, and 6.92 A, respectively. Magnetization measurements reveal that 1 is moderately antiferromagnetically coupled while 2 and 3 are essentially uncoupled. The electronic spectra in acetonitrile or in water solutions give results in accordance with the solid-state structures. 1 is EPR-silent, in agreement with the antiferromagnetic coupling between the two copper atoms. The X-band spectrum of powdered 2 is consistent with a tetragonally elongated square pyramid geometry around the Cu(II) ions, in accordance with the solid-state structure, while the spectrum in frozen solution suggests a change in the coordination geometry. The EPR spectra of 3 corroborate the solid-state and UV-visible studies. The 1H NMR spectra also lead to observations in accordance with the conclusions from other spectroscopies. The electrochemical behavior of 1 and 2 in acetonitrile or in water solutions shows that the first reduction (Cu(II)Cu(II)-Cu(II)Cu(I) redox couple) is reversible and the second (formation of Cu(I)Cu(I) irreversible. In water, 1 and 2 are reversibly interconverted upon acid/base titration (pK 4.95). In basic medium a new species, 4, is reversibly formed (pK 12.0), identified as the bishydroxo complex. Only 1 exhibits catecholase activity (oxidation of 3,5-di-tert-butylcatechol to the corresponding quinone, vmax = 1.1 x 10(-6) M-1 s-1 and KM = 1.49 mM). The results indicate that the pH dependence of the catalytic abilities of the complexes is related to changes in the coordination sphere of the metal centers.
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Affiliation(s)
- S Torelli
- Laboratoire de Chimie Biomimétique (LEDSS, UMR CNRS 5616), Université J. Fourier, BP 53, 38041 Grenoble, France
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Gonzalez de Peredo A, Saint-Pierre C, Adrait A, Jacquamet L, Latour JM, Michaud-Soret I, Forest E. Identification of the two zinc-bound cysteines in the ferric uptake regulation protein from Escherichia coli: chemical modification and mass spectrometry analysis. Biochemistry 1999; 38:8582-9. [PMID: 10387106 DOI: 10.1021/bi9902283] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Selective chemical modification of thiol groups combined with mass spectrometry analysis was used to characterize cysteine ligands in the zinc-binding site of the Fur protein. Fur is a metalloregulatory protein involved in the regulation of almost all bacterial genes related to iron uptake in Gram-negative bacteria such as Escherichia coli. In addition to the iron site, Fur also possesses a tight-binding zinc site that likely comprises two cysteines. Using a new procedure, we confirm the involvement of two cysteines in zinc binding and identify them within the two pairs of cysteines present in the protein. The protein was treated under nondenaturing conditions with iodoacetamide, and the progressive alkylation of the thiol groups monitored by quenching the reaction at different times and measuring the extent of alkylation by mass spectrometry. Complementary experiments were carried out in the absence or presence of EDTA, a strong zinc chelator, to determine which of the cysteines were protected from alkylation by the zinc atom. Enzymatic digestion of the modified protein and analysis of the peptide mixture by mass spectrometry enabled fast identification of reactive and protected thiol groups. Two cysteines, Cys92 and Cys95, were thus assigned as zinc ligands. Examination of the sequence comprising the zinc site indicates that it may belong to a new type of structural zinc site. Furthermore, Cys132 was shown to be the fastest reacting cysteine, implying it is a surface-exposed residue.
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Affiliation(s)
- A Gonzalez de Peredo
- Laboratoire de Spectrométrie de Masse des Protéines, Institut de Biologie Structurale, 38027 Grenoble Cedex 1, France
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Adrait A, Jacquamet L, Le Pape L, Gonzalez de Peredo A, Aberdam D, Hazemann JL, Latour JM, Michaud-Soret I. Spectroscopic and saturation magnetization properties of the manganese- and cobalt-substituted Fur (ferric uptake regulation) protein from Escherichia coli. Biochemistry 1999; 38:6248-60. [PMID: 10320354 DOI: 10.1021/bi9823232] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Fur apoprotein has been purified and reconstituted with Co2+ and Mn2+ ions. These samples have been analyzed by UV-visible, EPR, and 1H NMR spectroscopies, by XAS, and by magnetization measurements. The apo-Fur protein is able to bind one metal dication (Co2+ or Mn2+) per monomer. A saturation magnetization study confirms the presence of a high-spin metal dication [Mn(II) S = 5/2 and Co(II) S = 3/2]. The two metal ions per Fur dimer are not in magnetic interaction (|J| < 0.1 cm-1 ). The UV-visible spectrum of the cobalt-substituted form (Co-Fur) presents two main bands at 660 nm and 540(br) nm with epsilon540 nm = 65 M-1 cm-1. The EPR spectrum gives the following g values: gx = 5.0(5), gy = 4.0(2), and gz = 2. 3(1), which are in accordance with a nearly axial (E/D < 0.11) site. The value of 55 cm-1 for the splitting (Delta) between the ground and the first excited state has been derived from an EPR saturation study and is in agreement with magnetization data. The EXAFS data of Co-Fur indicate a metal environment comprising five nitrogen/oxygen atoms at 2.11 A, the absence of sulfur, and the presence of histidines as ligands. 1H NMR of Co-Fur in H2O and D2O shows at least two exchangeable signals coming from histidine NH protons and shows the signature of carboxylate group(s). The combined spectroscopic data allow us to propose that the main metal site of Fur in Co-Fur contains at least two histidines, at least one aspartate or glutamate, and no cysteine as ligands and is in an axially distorted octahedral environment.
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Affiliation(s)
- A Adrait
- Laboratoire de Chimie de Coordination (Unité de Recherche Associée au CNRS No. 1194), Service de Chimie Inorganique et Biologique, Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 38054 Grenoble Cedex 9, France
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17
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Jacquamet L, Aberdam D, Adrait A, Hazemann JL, Latour JM, Michaud-Soret I. X-ray absorption spectroscopy of a new zinc site in the fur protein from Escherichia coli. Biochemistry 1998; 37:2564-71. [PMID: 9485406 DOI: 10.1021/bi9721344] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The zinc K-edge X-ray absorption spectra of the Fur (ferric uptake regulation) protein isolated from Escherichia coli have been analyzed in frozen solution to determine details of the zinc coordination. The spectra of apoFur and of the cobalt-substituted protein have been analyzed and compared in order to see the influence of the cobalt incorporation on the geometry of the zinc site. EXAFS analysis gave for both samples (apoFur and CoFur) a tetrahedral environment for the zinc atom with two sulfur donor ligands at a distance of 2.3 A from the zinc and two N/O donor ligands at 2.0 A. The two sulfur donor ligands are probably two of the four cysteines present in each Fur monomer and could be Cys92 and Cys95, which are known from mutagenesis studies to be essential for Fur activity [Coy, M., Doyle, C., Besser, J., and Neilands, J. B. (1994) BioMetals 7, 292-298]. The distances obtained from our fits were always too short to be compatible with penta or hexa coordination. The typical pattern observed for the Fourier transform of the EXAFS oscillations suggests the presence of at least one imidazole ligand. The XANES of these two forms of the protein are similar but significantly different. This suggests a change of the conformation of the zinc site upon cobalt incorporation. The present study provides the first unambiguous evidence for the presence of a structural zinc site in the Fur protein from Escherichia coli.
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Affiliation(s)
- L Jacquamet
- Departement de Recherche Fondamentale sur la Matiere Condensee, Service de Chimie Inorganique et Biologique, Laboratoire de Chimie de Coordination (Unite de Recherche Associee au CNRS No.1194), CEA-Grenoble, 38054 Grenoble Cedex 9, France
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Michaud-Soret I, Adrait A, Jaquinod M, Forest E, Touati D, Latour JM. Electrospray ionization mass spectrometry analysis of the apo- and metal-substituted forms of the Fur protein. FEBS Lett 1997; 413:473-6. [PMID: 9303558 DOI: 10.1016/s0014-5793(97)00963-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Fur has been purified and reconstituted with Co2+ and Mn2+. The ESI-MS spectra of the apoprotein as well as Mn-Fur and Co-Fur under acidic denaturating conditions showed the existence of two species of molecular mass 16,660 +/- 3 and 16,792 +/- 3 Da, which correspond, respectively, to the N-terminal methionine 'excised' or 'non-excised' forms of the monomer. This result proves the absence of any other post-translational modification or modification due to metal incorporation. On the other hand, under soft conditions, ESI spectra provided for the first time direct evidence for dimeric metal-containing forms in solution.
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Affiliation(s)
- I Michaud-Soret
- Département de Recherche Fondamentale sur la Matière Condensée, (Unité de Recherche Associée au CNRS No. 1194), CEA-Grenoble, France.
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