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Wyświetlanie 1-15 z 21
Tytuł:
Hipotetyczna rola autokatalitycznych właściwości kwasów nukleinowych w procesie biogenezy
Hypotetical role of autocatalytic properties of nucleic acids in biogenesis
Autorzy:
Adamala, Katarzyna
Pikuła, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1199450.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Opis:
Ribozymes are catalytic RNA molecules. In this article their various types and activities in contrasts with corresponding DNA molecules are briefly characterized. The revolutionary discovery of the autocatalytic properties of nucleic acids by theNobel Prizewinners, Sidney Altman, Thomas R. CECH and their co-workers, led to the hypothesis of RNA world and to speculation on the role of RNA in the origin of life and the early stages of its evolution on Earth. The possible role of the autocatalytic properties of nucleic acids in prebiotic evolution is, therefore, discussed.
Źródło:
Kosmos; 2004, 53, 2; 123-131
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport functions and physiological significance of 76 kDa Ral-binding GTPase activating protein (RLIP76).
Autorzy:
Awasthi, Sanjay
Sharma, Rajendra
Yang, Yusong
Singhal, Sharad
Pikula, Slawomir
Bandorowicz-Pikula, Joanna
Singh, Shivendra
Zimniak, Piotr
Awasthi, Yogesh
Powiązania:
https://bibliotekanauki.pl/articles/1043688.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
RLIP76
RalBP1
glutathione conjugate
multidrug resistance
transport
Opis:
We have recently demonstrated that a previously known Ral-binding GTPase activating protein, RLIP76, can also catalyze ATP-dependent transport of various structurally unrelated xeno- and endobiotics irrespective of their net charge (Awasthi et al., 2000, Biochemistry, 39: 9327). RLIP76 is a non-ATP binding cassette (ABC) protein but it has two ATP-binding sites and shows basal ATPase activity which is stimulated in the presence of its transport substrates (allocrites) such as doxorubicin (DOX) and S-(2,4-dinitrophenyl) glutathione (DNP-SG). Proteoliposomes reconstituted with purified RLIP76 catalyze ATP-dependent, saturable transport of DOX, as well as of glutathione-conjugates including leukotrienes (LTC4) and the GSH-conjugate of 4-hydroxynonenal (GS-HNE). In erythrocytes the majority of transport activity for DOX, GS-HNE, and LTC4 is accounted for by RLIP76. Cells exposed to mild oxidative stress show a rapid and transient induction of RLIP76 resulting in an increased efflux of GS-HNE and acquire resistance to oxidative stress mediated toxicity and apoptosis. Cells transfected with RLIP76 acquire resistance to DOX through increased efflux of the drug suggesting its possible role in the mechanisms of drug-resistance. In this article, we discuss the significance of transport functions of RLIP76 highlighting its role in the defense mechanisms against oxidative injury, and modulation of signaling mechanisms.
Źródło:
Acta Biochimica Polonica; 2002, 49, 4; 855-867
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The roles of annexins and alkaline phosphatase in mineralization process.
Autorzy:
Balcerzak, Marcin
Hamade, Eva
Zhang, Le
Pikula, Slawomir
Azzar, Gérard
Radisson, Jacqueline
Bandorowicz-Pikula, Joanna
Buchet, Rene
Powiązania:
https://bibliotekanauki.pl/articles/1043372.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
mineralization
hydroxyapatite
alkaline phosphatase
annexin
matrix vesicle
Opis:
In this review the roles of specific proteins during the first step of mineralization and nucleation are discussed. Mineralization is initiated inside the extracellular organelles-matrix vesicles (MVs). MVs, containing relatively high concentrations of Ca2+ and inorganic phosphate (Pgi), create an optimal environment to induce the formation of hydroxyapatite (HA). Special attention is given to two families of proteins present in MVs, annexins (AnxAs) and tissue-nonspecific alkaline phosphatases (TNAPs). Both families participate in the formation of HA crystals. AnxAs are Ca2+- and lipid-binding proteins, which are involved in Ca2+ homeostasis in bone cells and in extracellular MVs. AnxAs form calcium ion channels within the membrane of MVs. Although the mechanisms of ion channel formation by AnxAs are not well understood, evidence is provided that acidic pH or GTP contribute to this process. Furthermore, low molecular mass ligands, as vitamin A derivatives, can modulate the activity of MVs by interacting with AnxAs and affecting their expression. AnxAs and other anionic proteins are also involved in the crystal nucleation. The second family of proteins, TNAPs, is associated with Pi homeostasis, and can hydrolyse a variety of phosphate compounds. ATP is released in the extracellular matrix, where it can be hydrolyzed by TNAPs, ATP hydrolases and nucleoside triphosphate (NTP) pyrophosphohydrolases. However, TNAP is probably not responsible for ATP-dependent Ca2+/phosphate complex formation. It can hydrolyse pyrophosphate (PPi), a known inhibitor of HA formation and a byproduct of NTP pyrophosphohydrolases. In this respect, antagonistic activities of TNAPs and NTP pyrophosphohydrolases can regulate the mineralization process.
Źródło:
Acta Biochimica Polonica; 2003, 50, 4; 1019-1038
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alzheimers disease: Its origin at the membrane, evidence and questions.
Autorzy:
Buchet, Rene
Pikuła, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1044315.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
β-amyloid precursor protein
membrane proteases
Alzheimer's disease
lipid composition
membrane microdomains
Opis:
Numerous results on membrane lipid composition from different regions of autopsied Alzheimer's disease brains in comparison with corresponding fractions isolated from control brains revealed significant differences in serine- and ethanolamine-containing glycerophospholipid as well as in glycosphingolipid content. Changes in membrane lipid composition are frequently accompanied by alterations in membrane fluidity, hydrophobic mismatch, lipid signaling pathways, transient formation and disappearance of lipid microdomains, changes in membrane permeability to cations and variations of other membrane properties. In this review we focus on possible implications of altered membrane composition on β-amyloid precursor protein (APP) and on proteolysis of APP leading eventually to the formation of neurotoxic β-amyloid (Aβ) peptides, the major proteinaceous component of extracellular senile plaques, directly involved in Alzheimer's disease pathogenesis.
Źródło:
Acta Biochimica Polonica; 2000, 47, 3; 725-733
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Affinity labeling of annexin VI with a triazine dye, Cibacron blue 3GA. Probable interaction of the dye with C-terminal nucleotide-binding site within the annexin molecule
Autorzy:
Danieluk, Małgorzata
Buś, Renata
Pikuła, Sławomir
Bandorowicz-Pikuła, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1044526.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1999, 46, 2; 419-429
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is the glutathione conjugate of trans-4-hydroxy-2-nonenal transported by the multispecific organic anion transporting-ATPase of human erythrocytes?
Autorzy:
Dygas, Anna
Makowski, Piotr
Pikuła, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1044853.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1998, 45, 1; 59-65
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GTP-binding properties of the membrane-bound form of porcine liver annexin VI.
Autorzy:
Kirilenko, Aneta
Golczak, Marcin
Pikuła, Sławomir
Bandorowicz-Pikuła, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1044028.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
annexin VI
GTP-binding domain
TNP-GTP
circular dichroism
GTP binding
Opis:
Annexin VI (AnxVI) of molecular mass 68-70 kDa belongs to a multigenic family of ubiquitous Ca2+ - and phospholipid-binding proteins. In this report, we describe the GTP-binding properties of porcine liver AnxVI, determined with a fluorescent GTP analogue, 2'-(or 3')-O-(2,4,6-trinitrophenyl)guanosine 5'-triphosphate (TNP-GTP). The optimal binding of TNP-GTP to AnxVI was observed in the presence of Ca2+ and asolectin liposomes, as evidenced by a 5.5-fold increase of TNP-GTP fluorescence and a concomitant blue shift (by 17 nm) of its maximal emission wavelength. Titration of AnxVI with TNP-GTP resulted in the determination of the dissociation constant (Kd) and binding stoichiometry that amounted to 1.3 μM and 1:1 TNP-GTP/AnxVI, mole/mole, respectively. In addition, the intrinsic fluorescence of the membrane-bound form of AnxVI was quenched by TNP-GTP and this was accompanied by fluorescence resonance energy transfer (FRET) from AnxVI Trp residues to TNP-GTP. This indicates that the GTP-binding site within the AnxVI molecule is probably located in the vicinity of a Trp-containing domain of the protein. By controlled proteolysis of human recombinant AnxVI, followed by purification of the proteolytic fragments by affinity chromatography on GTP-agarose, we isolated a 35 kDa fragment corresponding to the N-terminal half of AnxVI containing Trp192. On the basis of these results, we suggest that AnxVI is a GTP-binding protein and the binding of the nucleotide may have a regulatory impact on the interaction of annexin with membranes, e.g. formation of ion channels by the protein.
Źródło:
Acta Biochimica Polonica; 2001, 48, 4; 851-865
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
10-Undecynoic acid, an inhibitor of cytochrome P450 4A1, inhibits ethanolamine-specific phospholipid base exchange reaction in rat liver microsomes
Autorzy:
Lenart, Jacek
Pikuła, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1044558.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1999, 46, 1; 203-210
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The induction of cytochrome P450 isoform, CYP4A1, by clofibrate coincides with activation of ethanolamine-specific phospholipid base exchange reaction in rat liver microsomes
Autorzy:
Lenart, Jacek
Komańska, Izabela
Jasińska, Renata
Pikuła, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1044862.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1998, 45, 1; 119-126
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The network of calcium regulation in muscle.
Autorzy:
Martonosi, Anthony
Pikula, Slawomir
Powiązania:
https://bibliotekanauki.pl/articles/1043643.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
sodium:calcium exchanger
calcium pump
calcium homeostasis
calcium channel
skeletal and cardiac muscles
mitochondria
sarcoplasmic reticulum
excitation-contraction coupling
Opis:
In this review the molecular characteristics and reaction mechanisms of different Ca2+ transport systems associated with various membranes in muscle cells will be summarized. The following topics will be discussed in detail: a brief history of early observations concerning maintenance and regulation of cellular Ca2+ homeostasis, characterization of the Ca2+ pumps residing in plasma membranes and sarco(endo)plasmic reticulum, mitochondrial Ca2+ transport, Ca2+-binding proteins, coordinated expression of Ca2+ transport systems, a general background of muscle excitation-contraction coupling with emphasis to the calcium release channels of plasma membrane and sarcoplasmic reticulum, the structure and function of dihydropyridine and ryanodine receptors of skeletal and cardiac muscles, and finally their disposition in various types of muscles.
Źródło:
Acta Biochimica Polonica; 2003, 50, 1; 1-30
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure of the Ca2+-ATPase of sarcoplasmic reticulum.
Autorzy:
Martonosi, Anthony
Pikula, Slawomir
Powiązania:
https://bibliotekanauki.pl/articles/1043610.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
calcium pump
calcium homeostasis
calcium transport
skeletal and cardiac muscles
sarcoplasmic reticulum
excitation-contraction coupling
Opis:
In this article the morphology of sarcoplasmic reticulum, classification of Ca2+-ATPase (SERCA) isoenzymes presented in this membrane system, as well as their topology will be reviewed. The focus is on the structure and interactions of Ca2+-ATPase determined by electron and X-ray crystallography, lamellar X-ray and neutron diffraction analysis of the profile structure of Ca2+-ATPase in sarcoplasmic reticulum multilayers. In addition, targeting of the Ca2+-ATPase to the sarcoplasmic reticulum is discussed.
Źródło:
Acta Biochimica Polonica; 2003, 50, 2; 337-365
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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