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Wyświetlanie 1-2 z 2
Tytuł:
Phosphorylation of basic amino acid residues in proteins: important but easily missed
Autorzy:
Cieśla, Joanna
Frączyk, Tomasz
Rode, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1039902.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
basic amino acids
posttranslational modification
phosphorylation
acid-labile
base-stable
phosphoramidate
Opis:
Reversible phosphorylation is the most widespread posttranslational protein modification, playing regulatory role in almost every aspect of cell life. The majority of protein phosphorylation research has been focused on serine, threonine and tyrosine that form acid-stable phosphomonoesters. However, protein histidine, arginine and lysine residues also may undergo phosphorylation to yield acid-labile phosphoramidates, most often remaining undetected in conventional studies of protein phosphorylation. It has become increasingly evident that acid-labile protein phosphorylations play important roles in signal transduction and other regulatory processes. Beside acting as high-energy intermediates in the transfer of the phosphoryl group from donor to acceptor molecules, phosphohistidines have been found so far in histone H4, heterotrimeric G proteins, ion channel KCa3.1, annexin 1, P-selectin and myelin basic protein, as well as in recombinant thymidylate synthase expressed in bacterial cells. Phosphoarginines occur in histone H3, myelin basic protein and capsidic protein VP12 of granulosis virus, whereas phospholysine in histone H1. This overview of the current knowledge on phosphorylation of protein basic amino-acid residues takes into consideration its proved or possible roles in cell functioning. Specific requirements of studies on acid-labile protein phosphorylation are also indicated.
Źródło:
Acta Biochimica Polonica; 2011, 58, 2; 137-148
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Altered mouse leukemia L1210 thymidylate synthase, associated with cell resistance to 5-fluoro-dUrd, is not mutated but rather reflects posttranslational modification
Autorzy:
Cieśla, Joanna
Frączyk, Tomasz
Zieliński, Zbigniew
Sikora, Jacek
Rode, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1041288.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein phosphorylation
L1210
thymidylate synthase
posttranslational modification
FdUrd resistance
Opis:
Thymidylate synthase purified from 5-fluoro-dUrd-resistant mouse leukemia L1210 cells (TSr) was less sensitive to slow-binding inhibition by 5-fluoro-dUMP than the enzyme from the parental cells (TSp), both enzyme forms differing also in sensitivity to several other dump analogues, apparent molecular weights of monomer and dimer, and temperature dependence of the catalyzed reaction. Direct sequencing of products obtained from RT-PCR, performed on total RNA isolated from the parental and 5-fluoro-dUrd-resistant cells, proved both nucleotide sequences to be identical to the mouse thymidylate synthase coding sequence published earlier (NCBI protein database access no. NP_067263). This suggests that the altered properties of TSr are caused by a factor different than protein mutation, presumably posttranslational modification. As a possibility of rat thymidylate synthase phosphorylation has been recently demonstrated (Samsonoff et al. (1997) J Biol Chem 272: 13281), the mouse enzyme amino-acid sequence was analysed, revealing several potential phosphorylation sites. In order to test possible influence of the protein phosphorylation state on enzymatic properties, endogenous TSp and TSr were purified in the presence of inhibitors of phosphatases. Although both enzyme forms were phosphorylated, as shown by electrophoretical separation followed by phosphoprotein detection, the extent of phosphorylation was apparently similar. However, the same two purified enzyme preparations, compared to the corresponding preparations purified in the absence of phosphatase inhibitors, showed certain properties, including sensitivity to the slow-binding inhibition by FdUMP, altered. Thus properties dependence on phosphorylation was indicated.
Źródło:
Acta Biochimica Polonica; 2006, 53, 1; 189-198
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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