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Wyświetlanie 1-4 z 4
Tytuł:
Klasyfikacja i transdukcja wewnątrzkomórkowego sygnału metabotropowych receptorów amin biogennych
Classification and intracellular signaling transduction of metabotropic biogenic amine receptors
Autorzy:
Więcławek, Agnieszka
Kyrcz-Krzemień, Sławomira
Mazurek, Urszula
Sławska, Helena
Oslizlo, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1039853.pdf
Data publikacji:
2009
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
aminy biogenne
receptory metabotropowe
transdukcja sygnału
białka g
biogenic amines
metabotropic receptors
signaling transduction
g proteins
Opis:
Biogenic amines are very important biologically high- active compounds. Biological effect requires their cooperation with membrane receptors, belonging mainly to metabotropic receptors. These receptors activate specific type of G proteins, which subsequently take part in intracellular signaling pathways and therefore lead to activation of metabolic and biological processes such as: glycolysis, glyconeogenesis, transcription, translation, contraction of smooth muscle of blood vessels. Knowledge of intracellular signaling and its regulation may be helpful in preparing specific therapeutic solutions to pathologies, where biogenic amines play a significant role.
Aminy biogenne stanowią niezwykle ważną grupę związków o wysokiej aktywności biologicznej. Wywołanie efektu biologicznego wymaga współdziałania amin z błonowymi receptorami, w większości należącymi do receptorów metabotropowych. Receptory te uaktywniają określony rodzaj białek G, które z kolei uczestniczą w wewnątrzkomórkowej sygnalizacji prowadząc do pobudzenia zróżnicowanych procesów metabolicznych i biologicznych, m. in: glikolizy, glikogenolizy, transkrypcji, translacji, skurczu mięśni gładkich naczyń krwionośnych. Znajomość sygnalizacji wewnątrzkomórkowej oraz jej regulacji może być pomocna w opracowaniu specyficznych rozwiązań terapeutycznych patologii, w których znaczący jest udział amin biogennych.
Źródło:
Annales Academiae Medicae Silesiensis; 2009, 63, 4; 80-87
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emerging role of alternative splicing of CRF1 receptor in CRF signaling
Autorzy:
Żmijewski, Michał
Slominski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1040411.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
corticotropin-releasing factor
corticotropin-releasing factor receptor type 1
G-proteins
GPCR
hypothalamus-pituitary-adrenal axis
skin stress
Opis:
Alternative splicing of mRNA is one of the most important mechanisms responsible for an increase of the genomic capacity. Thus the majority of human proteins including G protein-coupled receptors (GPCRs) possess several isoforms as a result of mRNA splicing. The corticotropin-releasing factor (CRF) and its receptors are the most proximal elements of hypothalamic-pituitary-adrenal axis (HPA) - the central machinery of stress response. Moreover, expression of CRF and regulated activity of CRF receptor type 1 (CRF1) can also play an important role in regulation of local stress response in peripheral tissues including skin, gastrointestinal tract or reproductive system. In humans, expression of at least eight variants of CRF1 mRNA (α, β, c, d, e, f, g and h) was detected and alternative splicing was found to be regulated by diverse physiological and pathological factors including: growth conditions, onset of labor, during pregnancy or exposure to ultraviolet irradiation. The pattern of expression of CRF1 isoforms is cell type specific and recently has been linked to observed differences in responsiveness to CRF stimulation. In the proposed model of regulation of CRF-signaling, isoform CRF1α plays a central role. Other isoforms modulate its activity by oligomerization, leading to alteration in receptor trafficking, localization and function. Co-expression of CRF1 isoforms modulates sensitivity of cells to the ligands and influences downstream coupling to G-proteins. The other possible regulatory mechanisms include fast mRNA and/or protein turnover or decoy receptor function of CRF1 isoforms. Taken together, alternative splicing of CRF1 can represent another level of regulation of CRF-mediated stress responses at the central and peripheral levels. Chronic stress or malfunction of the HPA-axis have been linked to numerous human pathologies, suggesting that alternative splicing of CRF1 receptor could represent a promising target for drugs development.
Źródło:
Acta Biochimica Polonica; 2010, 57, 1; 1-13
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Xanthine, xanthosine and its nucleotides: solution structures of neutral and ionic forms, and relevance to substrate properties in various enzyme systems and metabolic pathways.
Autorzy:
Kulikowska, Ewa
Kierdaszuk, Borys
Shugar, David
Powiązania:
https://bibliotekanauki.pl/articles/1043286.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
enzyme reactions
prototropic tautomerism
xanthine
caffeine biosynthesis
metabolic pathways
G proteins
base pairing
xanthosine
acid/base properties
nucleotides
Opis:
The 6-oxopurine xanthine (Xan, neutral form 2,6-diketopurine) differs from the corresponding 6-oxopurines guanine (Gua) and hypoxanthine (Hyp) in that, at physiological pH, it consists of a ≈ 1:1 equilibrium mixture of the neutral and monoanionic forms, the latter due to ionization of N(3)-H, in striking contrast to dissociation of the N(1)-H in both Gua and Hyp at higher pH. In xanthosine (Xao) and its nucleotides the xanthine ring is predominantly, or exclusively, a similar monoanion at physiological pH. The foregoing has, somewhat surprisingly, been widely overlooked in studies on the properties of these compounds in various enzyme systems and metabolic pathways, including, amongst others, xanthine oxidase, purine phosphoribosyltransferases, IMP dehydrogenases, purine nucleoside phosphorylases, nucleoside hydrolases, the enzymes involved in the biosynthesis of caffeine, the development of xanthine nucleotide-directed G proteins, the pharmacological properties of alkylxanthines. We here review the acid/base properties of xanthine, its nucleosides and nucleotides, their N-alkyl derivatives and other analogues, and their relevance to studies on the foregoing. Included also is a survey of the pH-dependent helical forms of polyxanthylic acid, poly(X), its ability to form helical complexes with a broad range of other synthetic homopolynucleotides, the base pairing properties of xanthine in synthetic oligonucleotides, and in damaged DNA, as well as enzymes involved in circumventing the existence of xanthine in natural DNA.
Źródło:
Acta Biochimica Polonica; 2004, 51, 2; 493-531
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protein modeling with reduced representation: statistical potentials and protein folding mechanism
Autorzy:
Ekonomiuk, Dariusz
Kielbasinski, Marcin
Kolinski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1041306.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
B1 domain of protein G
statistical potentials
folding mechanism
Monte Carlo simulations
high resolution lattice proteins
protein folding
Opis:
A high resolution reduced model of proteins is used in Monte Carlo dynamics studies of the folding mechanism of a small globular protein, the B1 immunoglobulin-binding domain of streptococcal protein G. It is shown that in order to reproduce the physics of the folding transition, the united atom based model requires a set of knowledge-based potentials mimicking the short-range conformational propensities and protein-like chain stiffness, a model of directional and cooperative hydrogen bonds, and properly designed knowledge-based potentials of the long-range interactions between the side groups. The folding of the model protein is cooperative and very fast. In a single trajectory, a number of folding/unfolding cycles were observed. Typically, the folding process is initiated by assembly of a native-like structure of the C-terminal hairpin. In the next stage the rest of the four-ribbon β-sheet folds. The slowest step of this pathway is the assembly of the central helix on the scaffold of the β-sheet.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 741-748
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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