22 results on '"Kolkowska P"'
Search Results
2. SYK inhibition targets acute myeloid leukemia stem cells by blocking their oxidative metabolism
- Author
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Polak, Anna, Bialopiotrowicz, Emilia, Krzymieniewska, Beata, Wozniak, Jolanta, Stojak, Marta, Cybulska, Magdalena, Kaniuga, Ewelina, Mikula, Michał, Jablonska, Ewa, Gorniak, Patryk, Noyszewska-Kania, Monika, Szydlowski, Maciej, Piechna, Karolina, Piwocka, Katarzyna, Bugajski, Lukasz, Lech-Maranda, Ewa, Barankiewicz, Joanna, Kolkowska-Lesniak, Agnieszka, Patkowska, Elzbieta, Glodkowska-Mrowka, Eliza, Baran, Natalia, and Juszczynski, Przemyslaw
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- 2020
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3. Fibrils of α‑Synuclein Abolish the Affinity of Cu2+-Binding Site to His50 and Induce Hopping of Cu2+ Ions in the Termini.
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Bloch, Daniel N., Kolkowska, Paulina, Tessari, Isabella, Baratto, Maria Camilla, Sinicropi, Adalgisa, Bubacco, Luigi, Mangani, Stefano, Pozzi, Cecilia, Valensin, Daniela, and Miller, Yifat
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- 2019
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4. Summative evaluation of a sensor-based cognitive assistive technology: Impact on quality of life and perceived utility.
- Author
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Kristoffersson, Annica, Kolkowska, Ella, and Loutfi, Amy
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- 2019
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5. The hunt for computerized support in information security policy management: A literature review
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Rostami, Elham, Karlsson, Fredrik, and Kolkowska, Ella
- Abstract
Purpose: The purpose of this paper is to survey existing information security policy (ISP) management research to scrutinise the extent to which manual and computerised support has been suggested, and the way in which the suggested support has been brought about. Design/methodology/approach: The results are based on a literature review of ISP management research published between 1990 and 2017. Findings: Existing research has focused mostly on manual support for managing ISPs. Very few papers have considered computerised support. The entire complexity of the ISP management process has received little attention. Existing research has not focused much on the interaction between the different ISP management phases. Few research methods have been used extensively and intervention-oriented research is rare. Research limitations/implications: Future research should to a larger extent address the interaction between the ISP management phases, apply more intervention research to develop computerised support for ISP management, investigate to what extent computerised support can enhance integration of ISP management phases and reduce the complexity of such a management process. Practical implications: The limited focus on computerised support for ISP management affects the kind of advice and artefacts the research community can offer to practitioners. Originality/value: Today, there are no literature reviews on to what extent computerised support the ISP management process. Findings on how the complexity of ISP management has been addressed and the research methods used extend beyond the existing knowledge base, allowing for a critical discussion of existing research and future research needs.
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- 2020
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6. Fibrils of α-Synuclein Abolish the Affinity of Cu2+-Binding Site to His50 and Induce Hopping of Cu2+Ions in the Termini
- Author
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Bloch, Daniel N., Kolkowska, Paulina, Tessari, Isabella, Baratto, Maria Camilla, Sinicropi, Adalgisa, Bubacco, Luigi, Mangani, Stefano, Pozzi, Cecilia, Valensin, Daniela, and Miller, Yifat
- Abstract
The effect of Cu2+on α-synuclein (AS) aggregation is important because clinical studies of patients with Parkinson’s disease have shown elevated levels of Cu2+in the cerebrospinal fluid. So far, the molecular architectures of Cu2+–AS fibril complexes at atomic resolution are unknown. The current work identifies for the first time that His50 cannot bind Cu2+ions in mature fibrils. Moreover, it shows hopping of Cu2+ions between residues in AS fibrils and changes in the Cu2+coordination mode in Cu2+ions that bind in the termini of AS. The current study combines extensive experimental techniques, density functional theory calculations, and computational modeling tools to provide a complete description of the Cu2+binding site in AS fibrils. Our findings illustrate for the first time the specific interactions between Cu2+ions and AS fibrils, suggesting a new mechanistic perspective on the effect of Cu2+ions on AS aggregation.
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- 2019
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7. General Aspects of Metal Toxicity
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Kozlowski, H., primary, Kolkowska, P., additional, Watly, J., additional, Krzywoszynska, K., additional, and Potocki, S., additional
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- 2014
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8. Ag+ Complexes as Potential Therapeutic Agents in Medicine and Pharmacy
- Author
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Hecel, Aleksandra, Kolkowska, Paulina, Krzywoszynska, Karolina, Szebesczyk, Agnieszka, Rowinska-Zyrek, Magdalena, and Kozlowski, Henryk
- Abstract
Silver is a non-essential element with promising antimicrobial and anticancer properties. This work is a detailed summary of the newest findings on the bioinorganic chemistry of silver, with a special focus on the applications of Ag+ complexes and nanoparticles. The coordination chemistry of silver is given a reasonable amount of attention, summarizing the most common silver binding sites and giving examples of such binding motifs in biologically important proteins. Possible applications of this metal and its complexes in medicine, particularly as antibacterial and antifungal agents and in cancer therapy, are discussed in detail. The most recent data on silver nanoparticles are also summarized.
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- 2019
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9. Guest editorial
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Karlsson, Fredrik, Kolkowska, Ella, and Törner, Marianne
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- 2018
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10. Towards analysing the rationale of information security non-compliance: Devising a Value-Based Compliance analysis method.
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Kolkowska, Ella, Karlsson, Fredrik, and Hedström, Karin
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INFORMATION technology security ,NONCOMPLIANCE ,EMPLOYEE attitudes ,EMPLOYEE rules ,META-analysis - Abstract
Employees’ poor compliance with information security policies is a perennial problem. Current information security analysis methods do not allow information security managers to capture the rationalities behind employees’ compliance and non-compliance. To address this shortcoming, this design science research paper suggests: (a) a Value-Based Compliance analysis method and (b) a set of design principles for methods that analyse different rationalities for information security. Our empirical demonstration shows that the method supports a systematic analysis of why employees comply/do not comply with policies. Thus we provide managers with a tool to make them more knowledgeable about employees’ information security behaviours. [ABSTRACT FROM AUTHOR]
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- 2017
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11. Poly-Xaa Sequences in Proteins - Biological Role and Interactions with Metal Ions: Chemical and Medical Aspects
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Watly, Joanna, Hecel, Aleksandra, Kolkowska, Paulina, Kozlowski, Henryk, and Rowinska-Zyrek, Magdalena
- Abstract
Background: The understanding of the bioinorganic and coordination chemistry of metalloproteins containing unusual poly-Xaa sequences, in which a single amino acid is repeated consecutively, is crucial for describing their metal binding-structure-function relationship, and therefore also crucial for understanding their medicinal potential. To the best of our knowledge, this is the first systematic review on metal complexes with polyXaa sequences. Methods: We performed a thorough search of high quality peer reviewed literature on poly-Xaa type of sequences in proteins, focusing on their biological importance and on their interactions with metal ions. Results: 228 papers were included in the review. More than 70% of them discussed the role of metal complexes with the studied types of sequences. In this work, we showed numerous medically important and chemically fascinating examples of possible ‘poly-Xaa’ metal binding sequences. Conclusion: Poly-Xaa sequences, in which a single amino acid is repeated consecutively, are often not only tempting binding sites for metal ions, but very often, together with the bound metal, serve as structure determinants for entire proteins. This, in turn, can have consequences for the whole organism. Such sequences in bacterial metal chaperones can be a possible target for novel, antimicrobial therapeutics.
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- 2018
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12. Inter-organisational information security: a systematic literature review
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Karlsson, Fredrik, Kolkowska, Ella, and Prenkert, Frans
- Abstract
Purpose: The purpose of this paper is to survey existing inter-organisational information security research to scrutinise the kind of knowledge that is currently available and the way in which this knowledge has been brought about. Design/methodology/approach: The results are based on a literature review of inter-organisational information security research published between 1990 and 2014. Findings: The authors conclude that existing research has focused on a limited set of research topics. A majority of the research has focused management issues, while employees’/non-staffs’ actual information security work in inter-organisational settings is an understudied area. In addition, the majority of the studies have used a subjective/argumentative method, and few studies combine theoretical work and empirical data. Research limitations/implications: The findings suggest that future research should address a broader set of research topics, focusing especially on employees/non-staff and their use of processes and technology in inter-organisational settings, as well as on cultural aspects, which are lacking currently; focus more on theory generation or theory testing to increase the maturity of this sub-field; and use a broader set of research methods. Practical implications: The authors conclude that existing research is to a large extent descriptive, philosophical or theoretical. Thus, it is difficult for practitioners to adopt existing research results, such as governance frameworks, which have not been empirically validated. Originality/value: Few systematic reviews have assessed the maturity of existing inter-organisational information security research. Findings of authors on research topics, maturity and research methods extend beyond the existing knowledge base, which allow for a critical discussion about existing research in this sub-field of information security.
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- 2016
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13. Value conflicts for information security management.
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Hedström, Karin, Kolkowska, Ella, Karlsson, Fredrik, and Allen, J.P.
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INFORMATION resources management ,INFORMATION technology security ,STRATEGIC information system ,LONGITUDINAL method ,HUMAN behavior ,ORGANIZATIONAL behavior - Abstract
Abstract: A business’s information is one of its most important assets, making the protection of information a strategic issue. In this paper, we investigate the tension between information security policies and information security practice through longitudinal case studies at two health care facilities. The management of information security is traditionally informed by a control-based compliance model, which assumes that human behavior needs to be controlled and regulated. We propose a different theoretical model: the value-based compliance model, assuming that multiple forms of rationality are employed in organizational actions at one time, causing potential value conflicts. This has strong strategic implications for the management of information security. We believe health care situations can be better managed using the assumptions of a value-based compliance model. [Copyright &y& Elsevier]
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- 2011
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14. Early Mortality in Patients with Multiple Myeloma Treated with Novel Agents - Analysis from Polish Myeloma Study Group
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Charlinski, Grzegorz, Tyczyńska, Agata, Zaucha, Jan M, Czyz, Adriana, Czyż, Jarosław, Dytfeld, Dominik, Malecki, Bartosz, Gil, Lidia, Fornagiel, Szymon, Grosicki, Sebastian, Barchnicka, Agnieszka, Holojda, Jadwiga, Kolkowska, Agnieszka, Hus, Iwona, Helbig, Grzegorz, Kopinska, Anna, Masternak, Anna, Woszczyk, Dariusz, Markiewicz, Miroslaw, Piszcz, Jaroslaw, Kloczko, Janusz, Usnarska-Zubkiewicz, Lidia, Wrobel, Tomasz, Robak, Pawel J., Robak, Tadeusz, Waszczuk-Gajda, Anna, Basak, Grzegorz, and Jurczyszyn, Artur
- Abstract
Background
- Published
- 2020
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15. Improved Treatment Outcomes for Patients with Hodgkin Lymphoma Relapsing after Autologous Hematopoietic Stem Cell Transplantation in the Brentuximab Vedotin Era - the Real-Life Report from the Polish Lymphoma Research Group
- Author
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Czyz, Anna, Lojko-Dankowska, Anna, Giza, Agnieszka, Dlugosz-Danecka, Monika, Jurczak, Wojciech, Romejko-Jarosinska, Joanna, Paszkiewicz, Ewa, Rybka, Justyna, Drozd-Sokolowska, Joanna, Subocz, Edyta, Czerw, Tomasz, Nasilowska-Adamska, Barbara, Kolkowska, Agnieszka, Joanna, Manko, Hawrylecka, Dorota, Knopinska-Posluszny, Wanda, Agata, Szymanska, Gil, Lidia, Komarnicki, Mieczyslaw, Hus, Marek, Walewski, Jan, Giebel, Sebastian, Wrobel, Tomasz, and Zaucha, Jan
- Abstract
Czyz: Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees. Dlugosz-Danecka:Roche: Honoraria, Speakers Bureau; Janssen: Consultancy, Honoraria, Speakers Bureau; Macrogenomics: Research Funding; Servier: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Jurczak:Gilead: Research Funding; Sandoz: Membership on an entity's Board of Directors or advisory committees, Research Funding; Incyte: Research Funding; Roche: Research Funding; Servier: Research Funding; MorphoSys: Research Funding; Janssen: Membership on an entity's Board of Directors or advisory committees, Research Funding; Loxo: Membership on an entity's Board of Directors or advisory committees, Research Funding; Takeda: Research Funding; AstraZeneca: Membership on an entity's Board of Directors or advisory committees, Research Funding; TG Therapeutics: Research Funding; Novo Nordisk: Research Funding; Bayer: Research Funding; Celtrion: Research Funding. Walewski:Gilead: Other: Travel Expenses; Bristol-Myers Squibb: Consultancy, Membership on an entity's Board of Directors or advisory committees; Janssen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Roche: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel Expenses, Research Funding; Amgen: Consultancy, Membership on an entity's Board of Directors or advisory committees; Celgene: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; Servier: Honoraria; Takeda: Honoraria, Research Funding; GlaxoSmithKline: Research Funding; Incyte: Consultancy, Membership on an entity's Board of Directors or advisory committees. Wrobel:Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees. Zaucha:Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees.
- Published
- 2019
- Full Text
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16. Brentuximab Vedotin Alone and in Combination with Bendamustine As Salvage Therapy for Primary Refractory or Relapsed Hodgkin Lymphoma: Multicentre Experience of the Polish Lymphoma Research Group (PLRG)
- Author
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Czyz, Anna, Lojko-Dankowska, Anna, Joks, Monika, Komarnicki, Mieczyslaw, Dlugosz-Danecka, Monika, Jurczak, Wojciech, Rybka, Justyna, Wrobel, Tomasz, Paszkiewicz, Ewa, Walewski, Jan, Hawrylecka, Dorota, Drozd-Sokolowska, Joanna, Subocz, Edyta, Agata, Szymanska, Witkowska, Magdalena, Smolewski, Piotr, Kolkowska, Agnieszka, Lech Maranda, Ewa, Knopinska-Posluszny, Wanda, Giebel, Sebastian, and Zaucha, Jan
- Abstract
Dlugosz-Danecka: Roche: Consultancy; Servier: Consultancy. Jurczak:Nordic Nanovector: Research Funding; Epizyme: Research Funding; Beigene: Research Funding; Bayer: Research Funding; Celgene: Research Funding; Merck: Research Funding; Servier: Consultancy, Honoraria, Research Funding; European Medicines Agency: Consultancy; AstraZeneca: Consultancy; Gilead: Consultancy, Research Funding; Afimed: Research Funding; Morphosys: Research Funding; Janssen: Consultancy, Research Funding; Sandoz-Novartis: Consultancy; Roche: Research Funding; Pharmacyclics: Research Funding; Acerta: Consultancy, Research Funding; TG therapeutics: Research Funding. Zaucha:Roche: Honoraria; Takeda: Honoraria; Amgen: Honoraria; Celgene: Honoraria.
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- 2018
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17. Real-Life Comparison Of Severe Vascular Events and Other Non-Hematological Complications In CML Patients Treated With Second Line Nilotinib Or Dasatinib
- Author
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Gora-Tybor, Joanna, Medras, Ewa, Calbecka, Malgorzata, Kolkowska, Agnieszka, Ponikowska-Szyba, Edyta, Robak, Tadeusz, and Jamroziak, Krzysztof
- Abstract
Gora-Tybor: Bristol Myers Squibb: Honoraria, Membership on an entity’s Board of Directors or advisory committees; Novartis: Honoraria, Membership on an entity’s Board of Directors or advisory committees. Robak:Novartis: Honoraria, Membership on an entity’s Board of Directors or advisory committees; Bristol Myers Squibb: Honoraria, Membership on an entity’s Board of Directors or advisory committees.
- Published
- 2013
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18. Polish Myelodysplastic Syndromes Registry- Report of 15 Months of Activity.
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Dwilewicz-Trojaczek, Jadwiga, Madry, Krzysztof, Stella-Holowiecka, Beata, Mital, Andrzej, Szmigielska, Anna, Obara, Agata, Sikorska, Anita, Nita, Ewa, Mendrek, Wlodzimierz, Wiater, Elzbieta, Zalewska, Magdalena, Biedron, Monika, Jachalska, Anna, Wasilewska, Ewa, Wojciechowska, Malgorzata, Kopacz, Agnieszka, Nowicki, Adam, Kolkowska, Agnieszka, Guzicka-Kazimierczak, Renata, Pedziwiatr, Maria, Sedzimirska, Mariola, Nowak, Ewa, Blasiak, Anna, Baranska, Ewa, Soroka-Wojtaszko, Maria, Gornik, Slawomir, Kruger, Witold, Katinas, Katarzyna, Salamanczuk, Zoriana, Sokolowska, Bozena, Jedrzejczak, Wieslaw W., and Deptala, Andrzej
- Abstract
Myelodysplastic syndrome(MDS) belong to the most common hematological diseases however epidemiological data on MDS are sparse. Until 2008 there were no data about epidemiology of MDS in Poland.From 03.2008-05.2009 we have registered 966 patients in Polish MDS Registry. We have included only alive patients of various time of diagnosis. Patients from 22 centers were diagnosed according to WHO 2001 criteria.There were 508(53%)males and 458(47%) females. Median age at diagnosis was 70(range 19-99). Under 50 were 83(9%) cases with preponderance of females- 51 cases( males 32cases), between 50-70 there were 353(41%) cases, half of the patients-432(50%) were above 70( 247 males and 185 females).Prior chemotherapy and/or radiotherapy had 37((3,8%) patients. Distribution of MDS subtypes was as follows: RA-170(20%) cases, RARS-58(7%), RCMD-244(28%), RCMD-RS-18(2%), RAEB-1-120(14%), RAEB-2-169(19,5%), 5q- -40(4,6%), MDS-U-44(5%).In 103(10%) subtype was not done. Karyotype was available in 276(28%) cases. Cytogenetic risk groups were: low risk-182(68%), intermediate-52(20%) and high risk-33(12%). The most frequent cytogenetic results were: normal karyotype 44%, isolated 5q deletion 19%, complex karyotype 6%, 5q deletion + another one change 3% and 5q deletion with at least 2 changes 3%. According to IPSS risk groups low risk was found in 61( 22%) of cases, intermediate-1 -130(48%), intermediate-2-47(17%) and high risk in 31(11,5%). Median values of Hb was 9,1 g/dL, plts 129 G/L, ANC 1,7 G/L. RBC transfusion dependent were 429(44%) patients and platelet transfusion dependent were 100( 11%) pts. At least 2 U/month RBC transfusion requirement was 140(14%) patients. Serum ferritin level was assessed in 530 cases-171 of them( 32%) had higher than 1000μg/L level.We have observed predominance of females among MDS patients under 50. Half of the patients had RA or RCMD subtype. Isolated 5 q deletion was the most frequent cytogenetic abnormality. Forty four percentage of patients was RBC transfusion dependant. Serum ferritin level was significantly elevated in 32% of assessed patients at the moment of MDS diagnosis.No relevant conflicts of interest to declare.
- Published
- 2009
- Full Text
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19. Copper Binding and Redox Activity of α-Synuclein in Membrane-Like Environment.
- Author
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Bacchella C, Camponeschi F, Kolkowska P, Kola A, Tessari I, Baratto MC, Bisaglia M, Monzani E, Bubacco L, Mangani S, Casella L, Dell'Acqua S, and Valensin D
- Subjects
- Humans, Copper chemistry, Peptides metabolism, Oxidation-Reduction, alpha-Synuclein metabolism, Parkinson Disease metabolism
- Abstract
α-Synuclein (αSyn) constitutes the main protein component of Lewy bodies, which are the pathologic hallmark in Parkinson's disease. αSyn is unstructured in solution but the interaction of αSyn with lipid membrane modulates its conformation by inducing an α-helical structure of the N -terminal region. In addition, the interaction with metal ions can trigger αSyn conformation upon binding and/or through the metal-promoted generation of reactive oxygen species which lead to a cascade of structural alterations. For these reasons, the ternary interaction between αSyn, copper, and membranes needs to be elucidated in detail. Here, we investigated the structural properties of copper-αSyn binding through NMR, EPR, and XAS analyses, with particular emphasis on copper(I) coordination since the reduced state is particularly relevant for oxygen activation chemistry. The analysis was performed in different membrane model systems, such as micellar sodium dodecyl sulfate (SDS) and unilamellar vesicles, comparing the binding of full-length αSyn and N -terminal peptide fragments. The presence of membrane-like environments induced the formation of a copper:αSyn = 1:2 complex where Cu
+ was bound to the Met1 and Met5 residues of two helical peptide chains. In this coordination, Cu+ is stabilized and is unreactive in the presence of O2 in catechol substrate oxidation.- Published
- 2023
- Full Text
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20. Fibrils of α-Synuclein Abolish the Affinity of Cu 2+ -Binding Site to His50 and Induce Hopping of Cu 2+ Ions in the Termini.
- Author
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Bloch DN, Kolkowska P, Tessari I, Baratto MC, Sinicropi A, Bubacco L, Mangani S, Pozzi C, Valensin D, and Miller Y
- Abstract
The effect of Cu
2+ on α-synuclein (AS) aggregation is important because clinical studies of patients with Parkinson's disease have shown elevated levels of Cu2+ in the cerebrospinal fluid. So far, the molecular architectures of Cu2+ -AS fibril complexes at atomic resolution are unknown. The current work identifies for the first time that His50 cannot bind Cu2+ ions in mature fibrils. Moreover, it shows hopping of Cu2+ ions between residues in AS fibrils and changes in the Cu2+ coordination mode in Cu2+ ions that bind in the termini of AS. The current study combines extensive experimental techniques, density functional theory calculations, and computational modeling tools to provide a complete description of the Cu2+ binding site in AS fibrils. Our findings illustrate for the first time the specific interactions between Cu2+ ions and AS fibrils, suggesting a new mechanistic perspective on the effect of Cu2+ ions on AS aggregation.- Published
- 2019
- Full Text
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21. DOES hemopressin bind metal ions in vivo?
- Author
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Remelli M, Ceciliato C, Guerrini R, Kolkowska P, Krzywoszynska K, Salvadori S, Valensin D, Watly J, and Kozlowski H
- Subjects
- Histidine metabolism, Humans, Hydrogen-Ion Concentration, Ions chemistry, Ligands, Magnetic Resonance Spectroscopy, Protein Binding, Protons, Receptor, Cannabinoid, CB1 antagonists & inhibitors, Spectrometry, Mass, Electrospray Ionization, Copper chemistry, Hemoglobins chemistry, Nickel chemistry, Peptide Fragments chemistry
- Abstract
Hemopressin is a neuropeptide, derived from the degradation of the α(1)-chain of hemoglobin, and possesses several pharmacologic properties, such as the ability to block cannabinoid CB1 receptor activity, to cause dose-dependent hypotension and to inhibit food intake. Actually, human hemopressin (PVNFKLLSH) is only the precursor of a class of longer peptides, called "Pepcans", which bear additional residues at their amino-terminus and possess slightly different chemical and biological properties with respect to hemopressin. The presence of a histidyl residue and the free terminal amine imparts to hemopressin and its derivatives good binding properties towards transition metal ions. In this paper, we present a wide investigation on the complex-formation equilibria of human hemopressin and three analogues towards the Cu(ii) and Ni(ii) ions. The study showed that the main coordination site is always the amino terminus (if not protected), while the C-terminal histidine acts only as an anchoring site for the metal ions at acidic pH, with the formation of a macrochelate complex. The presence of additional residues in N-terminal position produces significant differences in the protonation and complex-formation behaviors of these peptides, which can be explained in terms of charge of the ligand and coordination environment. Although the participation of metal ions in the biological activity of hemopressin and Pepcans has not yet been demonstrated, the data reported here can help to shed light on the mechanisms governing the action of these neuropeptides in vivo.
- Published
- 2016
- Full Text
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22. Specificity of the Zn(2+), Cd(2+) and Ni(2+) ion binding sites in the loop domain of the HypA protein.
- Author
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Kolkowska P, Krzywoszynska K, Potocki S, Chetana PR, Spodzieja M, Rodziewicz-Motowidlo S, and Kozlowski H
- Subjects
- Binding Sites, Histidine chemistry, Metallochaperones, Protein Binding, Protein Structure, Tertiary, Bacterial Proteins chemistry, Cadmium chemistry, Carrier Proteins chemistry, Nickel chemistry, Peptides chemistry, Zinc chemistry
- Abstract
The zinc binding loop domain of the HypA protein of Helicobacter pylori consists of two CXXC motifs with flanking His residues. These motifs bind metal ions, and thus they are crucial for the functioning of the whole protein. The N-terminal site, where His is separated from CXXC by Ser residue is more effective in binding Zn(2+) and Ni(2+) ions than the C-terminal site, in which His is adjacent to the CXXC motif. Studies on various modifications of the peptide sequence within the Ac-ELECKDCSHVFKPNALDYGVCEKCHS-NH2 loop show the role of the residues in the linker between the CXXC motifs and the effect of the length of the linker on the stability of the complexes it forms with Zn(2+), Cd(2+) and Ni(2+) ions. The proline residue in the linker between the two CXXC binding sites plays a distinct role in the metal ion binding ability of the loop, lowering the efficacy of the metal ion coordination. The deletion of the aliphatic residues from the linker between the CXXC motifs remarkably improves the binding efficacy of the loop.
- Published
- 2015
- Full Text
- View/download PDF
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