Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "protein-protein interactions" wg kryterium: Temat


Wyświetlanie 1-8 z 8
Tytuł:
Methionyl-tRNA synthetase.
Autorzy:
Deniziak, Marzanna
Barciszewski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1044120.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein-protein interactions
tRNA binding
Opis:
Methionyl-tRNA synthetase (MetRS) belongs to the family of 20 enzymes essential for protein biosynthesis. It links covalently methionine with its cognate tRNA. Crystal structures solved for bacterial MetRSs have given a number of interesting insights into enzyme architecture and methionylation catalysis. A comparison of sequences of MetRSs belonging to all kingdoms of life, as well as numerous biochemical and genetic studies have revealed the presence of various additional domains appended to the catalytic core of synthetase. They are responsible for interactions with tRNA and proteins. Tertiary structure of C-terminal tRNA-binding appendices can be deduced from those determined for their homologues: tRNA binding protein 111 and endothelial monocyte-activating polypeptide II. Contacts between MetRS and other proteins could be mediated not only by noncatalytic peptides but also by structural elements present in the catalytic core, e.g. Arg-Gly-Asp (RGD) motifs. Additional activities involve MetRS in the maintenance of translational fidelity and in coordination of ribosome biogenesis with protein synthesis.
Źródło:
Acta Biochimica Polonica; 2001, 48, 2; 337-350
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protein phosphatase 2A: Variety of forms and diversity of functions
Autorzy:
Lechward, Katarzyna
Awotunde, Olubunmi
Świątek, Wojciech
Muszyńska, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/1044037.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein phosphatase 2A
signal transduction
protein-protein interactions
reversible phosphorylation
cell cycle
carcinogenesis.
Opis:
Protein phosphatase 2A (PP2A) comprises a diverse family of phosphoserine-and phosphothreonine-specific phosphatases present in all eukaryotic cells. All forms of PP2A contain a catalytic subunit (PP2Ac) which forms a stable complex with the structural subunit PR65/A. The heterodimer PP2Ac-PR65/A associates with regulatory proteins, termed variable subunits, in order to form trimeric holoenzymes attributed with distinct substrate specificity and targeted to different subcellular compartments. PP2Ac activity can be modulated by reversible phosphorylation on Tyr307 and methylation on C-terminal Leu309. Studies on PP2A have shown that this enzyme may be implicated in the regulation of metabolism, transcription, RNA splicing, translation, differentiation, cell cycle, oncogenic transformation and signal transduction.
Źródło:
Acta Biochimica Polonica; 2001, 48, 4; 921-933
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The two faces of the proteins structure - Application of knowledge about intrinsically disordered proteins in rational drug design
Dwie twarze struktury przestrzennej białek – zastosowanie wiedzy o białkach samoistnie nieuporządkowanych w racjonalnym projektowaniu leków
Autorzy:
Górka, Adam
Bonarek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/41204476.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
elementy rozpoznawania molekularnego
oddziaływania białko białko
fałdowanie białek
cechy sekwencji aminokwasowej białek
molecular recognition features
protein protein interactions
protein folding
amino acid sequence properties of proteins
Opis:
Proteins are an essential component of living cells. Proper understanding of the properties of their structure is crucial to understanding their function in nature. The proteins and their fragments may exist in four states of structure organization: ordered, molten globule, pre molten globule and random coil. The particular function of proteins depend on any one of these states or a transition between them. A significant proportion of proteins in nature is composed of a mixture of ordered and intrinsically disordered regions, that fulfil important roles in the processes like signal transduction, cell cycle regulation and many others. The standard approach for rational drug design does not work for intrinsically disordered proteins (IDPs) and requires modified strategies. Furthermore, the majority of proteins with long intrinsically disordered regions (IDRs) use short molecular recognition elements (MoRFs), which undergo transition from disorder to order state and adopt various structures in numerous protein protein interactions. These interactions are an attractive therapeutic target for the pharmaceutical industry in the process of rational drug design.
Białka są podstawowymi składnikami żywych komórek. Prawidłowe rozumienie cech ich struktury przestrzennej jest kluczowe dla zrozumienia ich funkcjonowania w organizmach żywych. Białka mogą przebywać w czterech wyróżnionych stanach organizacji struktury przestrzennej: uporządkowanym, stopionej globuli, pre-stopionej globuli i kłębka statystycznego. Funkcje białek mogą być związane z każdym tych stanów, a co ważniejsze, z przejściami pomiędzy tymi stanami. Znacząca liczba białek w przyrodzie zbudowana jest z mieszaniny rejonów uporządkowanych oraz samoistnie nieuporządkowanych, które pełnią ważne role w procesach przekazu sygnału, regulacji cyklu komórkowego i wielu innych. Standardowe podejście do racjonalnego projektowania leków nie sprawdza się w przypadku białek samoistnie nieuporządkowanych (IDPs) i wymaga zmodyfikowanej strategii postępowania. Jednym z atrakcyjnych celów terapeutycznych dla przemysłu farmaceutycznego są krótkie fragmenty łańcucha aminokwasowego pełniące funkcje elementów rozpoznawania molekularnego (MoRFs), które porządkują swoją strukturę w różnorodnych i licznych oddziaływaniach z innymi białkami. Charakterystyczną cechą MoRFs-ów jest ich częste występowanie w rejonach samoistnie nieuporządkowanych łańcucha polipeptydowego.
Źródło:
Studia i Materiały Informatyki Stosowanej; 2013, 10; 7-12
1689-6300
Pojawia się w:
Studia i Materiały Informatyki Stosowanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of flotation assay conditions for syndapin binding to phosphatidic acid containing liposomes
Autorzy:
Piaścik, Magda
Zegarlińska, Jolanta
Sikorski, Aleksander F.
Czogalla, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/764838.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
protein-lipid interactions
LUVs
density gradient
ultracentrifugation
Opis:
Flotacja jest jedną z najefektywniejszych metod wstępnej identyfikacji oddziaływań białko-błony lipidowe. W większości przypadków wykorzystuje się w niej małe jednowarstwowe pęcherzyki lipidowe, które służą jako modele błonowe i nie wymagają dodatkowych nośników, takich jak membrany czy nanocząstki polimerowe, które są często używane w innych metodach mających na celu identyfikację oddziaływań białkolipid. W poniższej pracy prezentujemy wyniki uzyskane podczas badań oddziaływań kwasu fosfatydowego i syndapiny. Omawiamy także niektóre techniczne aspekty metody, kładąc nacisk na to jak małe zmiany w warunkach metody mogą wpłynąć na otrzymywane wyniki.
Flotation is one of the best method for preliminary identification of protein-lipid interactions. In most widely used approach it utilizes large unilamellar vesicles, that are excellent models of freestanding membranes and do not require any additional components, like solid supports or beads that are needed in other methods commonly used for protein-lipid binding studies. Here we present results obtained during our studies on phosphatidic acid - syndapin interactions and discuss some technical aspects of this method underlying how relatively small changes in the conditions can influence the results.
Źródło:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica; 2017, 13; 9-17
1730-2366
2083-8484
Pojawia się w:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lipid-binding proteins as stabilizers of membrane microdomains - possible physiological significance.
Autorzy:
Bandorowicz-Pikuła, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1044288.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
lipid-protein interactions
lipid-binding proteins
membrane microdomains
Opis:
Below the melting point temperature of lipids, artificial lipid membranes usually exist in the ordered gel phase. Above these temperatures lipid acyl chains become fluid and disordered (liquid-crystalline phase). Depending on the chemical composition of artificial membranes, phase separation may occur, leading to the formation of transient or stable membrane domains. A similar phase separation of lipids into ordered and disordered domains has been observed in natural membranes at physiological temperature range. Moreover, it has been reported that certain proteins prefer certain organization of lipids, as for example glycosylphosphatidylinositol-anchored proteins or Src family of tyrosine kinases. The aim of present review is to discuss the possibility that some lipid microdomains are induced or stabilized by lipid-binding proteins that under certain conditions, for example due to a rise of cytosolic Ca2+ or pH changes, may attach to the membrane surface, inducing clustering of lipid molecules and creation of ordered lipid microdomains. These domains may than attract other cytosolic proteins, either enzymes or regulatory proteins. It is, therefore, postulated that lipid microdomains play important roles within a cell, in signal transduction and enzymatic catalysis, and also in various pathological states, as Alzheimer's disease, anti-phosphatidylserine syndrome, or development of multidrug resistance of cancer cells.
Źródło:
Acta Biochimica Polonica; 2000, 47, 3; 553-564
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of dipeptidyl peptidase IV on enzymatic properties of adenosine deaminase
Autorzy:
Sharoyan, Svetlana
Antonyan, Alvard
Mardanyan, Sona
Lupidi, Giulio
Cristalli, Gloria
Powiązania:
https://bibliotekanauki.pl/articles/1041210.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein-protein interaction
large and small adenosine deaminases
CD26-dipeptidyl peptidase IV
enzyme-substrate and enzyme-inhibitor interactions
Opis:
The importance of ADA (adenosine deaminase) in the immune system and the role of its interaction with an ADA-binding cell membrane protein dipeptidyl peptidase IV (DPPIV), identical to the activated immune cell antigen, CD26, has attracted the interest of researchers for many years. To investigate the specific properties in the structure - function relationship of the ADA/DPPIV-CD26 complex, its soluble form, identical to large ADA (LADA), was isolated from human blood serum, human pleural fluid and bovine kidney cortex. The kinetic constants (Km and Vmax) of LADA and of small ADA (SADA), purified from bovine lung and spleen, were compared using adenosine (Ado) and 2'-deoxyadenosine (2'-dAdo) as substrates. The Michaelis constant, Km, evidences a higher affinity of both substrates (in particular of more toxic 2'-dAdo) for LADA and proves the modulation of toxic nucleoside neutralization in the extracellular medium due to complex formation between ADA and DPPIV-CD26. The values of Vmax are significantly higher for SADA, but the efficiency, Vmax /Km, in LADA-catalyzed 2'-dAdo deamination is higher than that in Ado deamination. The interaction of all enzyme preparations with derivatives of adenosine and erythro-9-(2-hydroxy-3-nonyl)adenine (EHNA) was studied. 1-DeazaEHNA and 3-deazaEHNA demonstrate stronger inhibiting activity towards LADA, the DPPIV-CD26-bound form of ADA. The observed differences between the properties of the two ADA isoforms may be considered as a consequence of SADA binding with DPPIV-CD26. Both SADA and LADA indicated a similar pH-profile of adenosine deamination reaction with the optimum at pHs 6.5 - 7.5, while the pH-profile of dipeptidyl peptidase activity of the ADA/DPPIV-CD26 complex appeared in a more alkaline region.
Źródło:
Acta Biochimica Polonica; 2006, 53, 3; 539-546
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of HIV as a gene transfer vector
Autorzy:
Pluta, Krzysztof
Kacprzak, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1040467.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Lentivirus
lentiviral vectors
AIDS
HIV-1 life cycle
viral-host protein interactions
gene therapy
animal transgenesis
cell engineering
Opis:
Despite the extensive research efforts over the past 25 years that have focused on HIV, there is still no cure for AIDS. However, tremendous progress in the understanding of the structure and biology of the HIV virus led to the development of safe and potent HIV-based transgene delivery vectors. These genetic vehicles are referred to as lentiviral vectors. They appear to be better suited for particular applications, such as transgene delivery into stem cells, compared to other viral- and non-viral vectors. This is because Lentivirus-based vectors can efficiently infect nondividing and slowly dividing cells. In the present review article, the current state of understanding of HIV-1 is discussed and the main characteristics that had an impact on vector design are outlined. A historical view on the vector concept is presented to facilitate discussion of recent results in vector engineering in a broader context. Subsequently, a state of the art overview concerning vector construction and vector production is given. This review also touches upon the subject of lentiviral vector safety and related topics that can be helpful in addressing this issue are discussed. Finally, examples of Lentivirus-based gene delivery systems and their applications are presented, with emphasis on animal transgenesis and human gene therapy.
Źródło:
Acta Biochimica Polonica; 2009, 56, 4; 531-595
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Budowa i funkcje układów białkowo-lipidowych
Structure and function of protein-lipid systems
Autorzy:
Litwińczuk-Mammadova, A.
Cieślik-Boczula, K.
Rospenk, M.
Powiązania:
https://bibliotekanauki.pl/articles/972303.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
odziaływania białko-lipid
liposomy DPPC
przejścia fazowe
α-laktoalbumina
kompleks HAMLET/BAMLET
stopiona globula
lipid-protein interactions
DPPC liposomes
phase transitions
α-lactalbumin
complex HAMLET/BAMLET
molten globule state
Opis:
Biomembranes play many structural and functional roles in both prokaryotic and eukaryotic cells [10]. They define compartments, the communication between the inside and outside of the cell. The main components of biomembranes are lipids and proteins, which form protein-lipid bilayer systems [10]. A structure and physicochemical properties of protein-lipid membranes, which determines biological activities of biomembranes, are strongly dependent on interactions between lipid and protein components and external agents such as a temperature, pH, and a membrane hydration [4]. A lipid bilayer matrix serves as a perfect environment for membrane proteins (Fig. 1), and it assures activities of these proteins. Because biomembranes are composed of many different groups of lipids and proteins and have a complex structure, it is difficult to study in details their physicochemical properties using physicochemical methods. For these reason, lipid membranes of liposomes are used in many scientific laboratories for studding processes associated with a lipid phase transition, a membrane hydration, or protein-membrane interactions. The structure of liposomes (Fig. 5), and an influence of pH and an ionic strength on a lipid bilayer structure are discussed in the presented work. The role of membrane proteins in determination of biological activities of biomembranes is highlighted. A high variety of a structure and an enzymatic activity of membrane proteins is responsible for a high diversity of biological functions of cell membranes [2]. α-Lactalbumin (α-LA) is a peripheral membrane protein (Figs 8 and 9), its biological function is strongly related to its conformational structure and interaction with lipid membranes [49]. The complex of α-LA in a molten globule conformational state with oleic acid, termed as a HAMLET complex, are disused in a context of its anti-tumor activity.
Źródło:
Wiadomości Chemiczne; 2016, 70, 11-12; 723-746
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies