Abstract：
:An analysis has been made, with the aid of 1H NMR spectroscopy, of the solution conformation of the known antimetabolite, 9-beta-D-xylofuranosyladenine (xyloA), and of its 8-bromo analogue. For xyloA, the results point to a strong preference for the sugar ring of the conformation type N (C(3') endo), a relatively low population of the gauche-gauche rotamer of the exocyclic 5'-CH2OH, and a preference for the conformation anti about the glycosidic bond. For 8-bromo-xyloA, the preference for the type N conformation of the sugar ring is less marked, and the preferred conformation about the glycosidic bond is syn. The conformation of the sugar ring in the foregoing xylonucleosides consequently differs appreciably from that for the corresponding ribonucleosides, which adopt preferentially the type S (C(2')endo) and gauche-gauche conformations. Comparison with previously reported results for O'-methyl derivatives of xyloA points to the similarity in conformational properties of all of these. In contrast to arabinonucleosides with free 2' and 5' hydroxyls, the conformation of xyloA is relatively unaffected in strongly alkaline medium where the sugar hydroxyl(s) dissociate. Under these conditions, there is no formation of an intramolecular hydrogen bond such as might have been anticipated from X-ray diffraction studies in the solid state.
journal_name
Acta Biochim Poljournal_title
Acta biochimica Polonicaauthors
Ekiel I,Shugar Dsubject
Has Abstractpub_date
1979-01-01 00:00:00pages
435-44issue
4eissn
0001-527Xissn
1734-154Xjournal_volume
26pub_type
杂志文章abstract：:(E)-2'-deoxy-2'-(fluoromethylene)-cytidine (FMdC), a deoxycytidine analog displaying a very high toxicity toward a variety of solid tumor cell lines and xenografts, is activated intracellularly by deoxycytidine kinase (dCK). We have compared cytotoxicity of FMdC towards a human promyeolocytic leukemia line HL-60 and a...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：2000-01-01 00:00:00
abstract：:Two structurally related compounds, phenyl dithiocarbamate sodium salt (I) and p-phenylene-bis (dithiocarbamate) sodium salt (II) were prepared by reaction of the parent aniline and p-phenylenediamine with CS₂ in the presence of sodium hydroxide. These water soluble compounds were characterized by spectroscopic techni...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：2010-01-01 00:00:00
abstract：:Regulation of proteolytic enzyme activity is an essential requirement for cells and tissues because proteolysis at a wrong time and location may be lethal. Proteases are synthesized as inactive or less active precursor molecules in order to prevent such inappropriate proteolysis. They are activated by limited intra- o...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：035003691
更新日期：2003-01-01 00:00:00
abstract：:A series of 9-aminoacridine carboxamide derivatives of systematically varied structure was assayed in an RNA synthesis in vitro system. Escherichia coli DNA-dependent RNA polymerase and DNA derived from phage T7 or calf thymus were used to measure the effect of the drugs on overall RNA and the initiating dinucleotide ...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1990-01-01 00:00:00
abstract：:Epidemiological studies have revealed a strong correlation between high intake of fruit and vegetables and low incidence of certain cancers. Micronutrients present in these foods are thought to decrease free radical attack on DNA and hence protect against mutations that cause cancer, but the fine details of the causal...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1998-01-01 00:00:00
abstract：:Liposomes made of sphingomyelin were found to inhibit both ATP-activated and non-activated AMP deaminase from pig brain, in contrast to liposomes made of egg yolk phosphatidylcholine which exhibited an activating effect on the ATP-activated enzyme, being without effect on AMP deaminase in the absence of ATP. Dioleoylp...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1987-01-01 00:00:00
abstract：:Mushroom foraging is very popular in some regions of the world. Sometimes toxic and edible mushrooms are mistaken by mushroom collectors, leading to serious human poisoning. The group of mushrooms highly dangerous for human health includes Amanita phalloides. This mushroom produces a toxic octapeptide called α-amaniti...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：10.18388/abp.2017_1615
更新日期：2017-01-01 00:00:00
abstract：:The object of this paper is to review briefly the studies on the interaction of red blood cell membrane skeletal proteins and their non-erythroid analogues with lipids in model systems as well as in natural membranes. An important question to be addressed is the physiological significance and possible regulatory molec...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：2000-01-01 00:00:00
abstract：:Filamentous fungi belonging to the Fusarium genus are responsible for large economic losses due to their high pathogenicity and toxigenicity. Fusarium sp. may produce variety of mycotoxins, one of them is zearalenone (ZEA). The presence of the PKS4 gene shows the possibility of zearalenone biosynthesis by Fusarium sp....
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：10.18388/abp.2015_1022
更新日期：2016-01-01 00:00:00
abstract：:Triterpene saponins (saponosides) are found in a variety of higher plants and display a wide range of pharmacological activities, including expectorant, anti-inflamatory, vasoprotective, gastroprotective and antimicrobial properties. Recently, a potential anticancer activity of saponins has been suggested by their cyt...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：10.18388/abp.2015_1089
更新日期：2015-01-01 00:00:00
abstract：:Dansylated analogues of the potent and selective micro opioid peptide agonist [Dmt(1)]DALDA (H-Dmt-D-Arg-Phe-Lys-NH(2); Dmt = 2',6'-dimethyltyrosine) were prepared either by substitution of N(beta)-dansyl-alpha,beta-diaminopropionic acid or N(epsilon)-dansyllysine for Lys(4), or by attachment of a dansyl group to the ...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：045101107
更新日期：2004-01-01 00:00:00
abstract：:Potassium permanganate oxidation of pyrimidine bases is often used to probe single-stranded regions in functional DNA-protein complexes. However, so far reactivity of these bases in double-stranded DNA has not been studied quantitatively. We have investigated the kinetics of oxidation of pyrimidines in supercoiled pDS...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：2001-01-01 00:00:00
abstract：:The properties of red blood cell membranes in patients with chronic renal failure were investigated using electron paramagnetic resonance spectroscopy. Using spin traps, 5,5-dimethylpirroline-1 oxide and N-tert-butyl-alpha-phenylnitrone, we found generation of hydroxyl radicals in the blood of patients with chronic re...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1997-01-01 00:00:00
abstract：:The evidence on the crucial role of a family of calcium-dependent cysteine proteases called calpains in programmed cell death is rich and still growing. However, understanding of the mechanisms of their functions in apoptosis is not full yet. Calpains have been implicated in both physiological and pathological cell de...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：2011-01-01 00:00:00
abstract：:One of the most unusual features of RNA viruses is their enormous genetic variability. Among the different processes contributing to the continuous generation of new viral variants RNA recombination is of special importance. This process has been observed for human, animal, plant and bacterial viruses. The collected d...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：2001-01-01 00:00:00
abstract：:The paper relates on the current advancements in the synthesis of complex cyclic terpenoids by superacidic induced cyclization of open chain precursors. It is shown that functional groups disposal in the initial substrate strongly influences the reaction outcome. Possible variations of the investigated compound struct...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：2007-01-01 00:00:00
abstract：:Spontaneous mutations arise not only in exponentially growing bacteria but also in non-dividing or slowly dividing stationary-phase cells. In the latter case mutations are called adaptive or stationary-phase mutations. High spontaneous mutability has been observed in temperature sensitive Escherichia coli dnaQ49 strai...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：045103683
更新日期：2004-01-01 00:00:00
abstract：:1. The insoluble collagen from Guerin epithelioma was isolated and its chemical composition was determined. The unusually high histidine content is accompanied in tumour collagen by a relatively small amount of lysine and arginine. 2. The isolated protein was strongly bound to glycoprotein, which could not be removed ...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1975-01-01 00:00:00
abstract：:We report the synthesis, photochemical and photophysical properties and preliminary studies on biological effect of a new tritolylporphyrin dimer (T-D). Absorption and emission properties of T-D suggest its possible use in photodynamic therapy. T-D is capable of singlet oxygen production with 0.8 quantum yield. It als...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：2001-01-01 00:00:00
abstract：:Methionine synthase reaction may be coupled with thymidylate synthase-catalysed tritium release from [5-3H]dUMP via non-enzymatic reaction of formaldehyde with tetrahydrofolate. A convenient and sensitive assay of methionine synthase activity, based on this principle, is described. ...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1985-01-01 00:00:00
abstract：:X-ray crystallography provides important insights into structure-function relationship in biomolecules. However, protein crystals are usually hard to obtain which hinders our understanding of multiple important processes. Crystallization requires large amount of protein sample, whereas recombinant proteins are often u...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：10.18388/abp.2015_1026
更新日期：2015-01-01 00:00:00
abstract：:Diabetes is one of the major challenges of modern medicine, as it is considered a global epidemic of the XXI century. The disease often leads to the development of serious, health threatening complications. Diabetic foot syndrome is a characteristic set of anatomical and molecular changes. At the macroscopic level, ma...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：2012-01-01 00:00:00
abstract：:Mitochondria were prepared from rat liver, solubilized with Triton X-100 and submitted to chromatography on dry hydroxylapatite. The pass-through from the column, containing a mixture of mitochondrial carriers, was processed further by triazine dye affinity chromatography and optimal conditions for binding and elution...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1990-01-01 00:00:00
abstract：:A set of metabolite carriers operates the traffic of numerous molecules consumed or produced in mitochondrial matrix and/or cytosolic compartments. As their existence has been predicted by the chemiosmotic theory, the first challenge, in the late sixties, was to prove their presence in the inner mitochondrial membrane...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：1996-01-01 00:00:00
abstract：:In this paper transcriptional factor IIIA (TFIIIA) has been used as a probe for identity of three-dimensional-structure of eukaryotic 5S rRNAs. I was interested in finding a common motif in plant and Xenopus 5S rRNAs for TFIIIA recognition. I found that the two eukaryotic 5S rRNAs (from wheat germ and lupin seeds) are...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1994-01-01 00:00:00
abstract：:1. The lupin cotyledons contain two cytoplasm-specific lysine tRNAs, one chloroplast-specific, one mitochondria-specific species, and three species common to all the cell compartments investigated; the lysine tRNAs were separated by reversed-phase chromatography (RPC-5). 2. The two cytoplasmic lysine tRNAs are predomi...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1978-01-01 00:00:00
abstract：:A conservative and apparently harmless A176V mutation in intracellular S. cerevisiae L-asparaginase (ScerAI) completely abolishes the enzyme activity. Sequence and structural comparisons with type II bacterial L-asparaginases show that the mutated residue is in a very conservative region and plays a vital role in the ...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：
更新日期：1997-01-01 00:00:00
abstract：:Endogenous peptide antibiotics are known as evolutionarily old components of innate immunity. Due to interaction with cell membrane these peptides cause permeabilization of the membrane and lysis of invading microbes. However, some studies proved that antimicrobial peptides are universal multifunctional molecules and ...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章,评审
doi：035002461
更新日期：2003-01-01 00:00:00
abstract：:Nowadays, scientists may learn a lot about the organisms studied just by analyzing their genetic material. This requires the development of methods of reading genomes with high accuracy. It has become clear that the knowledge of the changes occurring within a viral genome is indispensable for effective fighting of the...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：045104983
更新日期：2004-01-01 00:00:00
abstract：:Eight polymorphic restriction enzyme sites at phenylalanine hydroxylase locus from the parental chromosomes in Polish families with phenylketonuria were analyzed. Among 28 chromosomes studied, we identified haplotypes found within the Danish population. Haplotype 2 has been found in 25% of affected alleles. One of the...
journal_title：Acta biochimica Polonica
pub_type： 杂志文章
doi：
更新日期：1989-01-01 00:00:00
