glycosidase/zhubný nádor

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Anti-cancer glycosidase inhibitors from natural products: a computational and molecular modelling perspective.

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The implementation of computational tools in pharmaceutics has proven an effectual strategy in creating harmony between the physical and chemical aspects of proteins and potential inhibitors. This is achieved by bringing to life the three dimensional retrospect of biological systems, which takes

A new activity of anti-HIV and anti-tumor protein GAP31: DNA adenosine glycosidase--structural and modeling insight into its functions.

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We report here the high-resolution atomic structures of GAP31 crystallized in the presence of HIV-LTR DNA oligonucleotides systematically designed to examine the adenosine glycosidase activity of this anti-HIV and anti-tumor plant protein. Structural analysis and molecular modeling lead to several

Glycosidases in cancer and invasion.

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Glycosidases have been demonstrated to be elevated in the interstitial fluid of tumors, sera of animals and patients with tumors, and in some tumor tissue as compared to normal adjacent tissue. Elevations of serum beta-N-acetylglucosaminidase and beta-glucuronidase most commonly have been found to

Glycosidase activated release of fluorescent 1,8-naphthalimide probes for tumor cell imaging from glycosylated 'pro-probes'.

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Glycosylated 4-amino-1,8-naphthalimide derivatives possess a native glycosidic linkage that can be selectively hydrolysed in situ by glycosidase enzymes to release the naphthalimide as a fluorescent imaging or therapeutic agent. In vitro studies using a variety of cancer cell lines demonstrated that

The effect of specific glycosidases on Ricinus communis agglutinin binding to cell surfaces of two tumor sublines. A comparative flow-cytometric study.

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The effects of the sequential application of specific glycosidases on surfaces of living mammalian cells were studied with respect to their ability to bind the beta-galactoside-specific lectin, Ricinus communis agglutinin (RCA). Sialidase and beta-galactosidases from different sources were tested

TYchi, a novel chitinase with RNA N-glycosidase and anti-tumor activities.

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Chitinases which catalyze hydrolysis of chitin are believed to be antifungal proteins in plant. Nevertheless, a variety of functions and some new enzymatic activities of chitinases have been found in recent years. We cloned a novel protein from Trichosanthes kirilowii Maximowicz (Family

Localization of binding sites of Ulex europaeus I, Helix pomatia and Griffonia simplicifolia I-B4 lectins and analysis of their backbone structures by several glycosidases and poly-N-acetyllactosamine-specific lectins in human breast carcinomas.

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Several studies have shown the deletion of blood group A or B antigens and the accumulation of H antigens in human breast carcinomas. Other studies have independently demonstrated that the binding sites of lectins such as Helix pomatia agglutinin (HPA) and Griffonia simplicifolia agglutinin I-B4

Chemically and biologically synthesized CPP-modified gelonin for enhanced anti-tumor activity.

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The ineffectiveness of small molecule drugs against cancer has generated significant interest in more potent macromolecular agents. Gelonin, a plant-derived toxin that inhibits protein translation, has attracted much attention in this regard. Due to its inability to internalize into cells, however,

A simple method for isolation of Gypsophila saponins for the combined application of targeted toxins and saponins in tumor therapy.

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Saponinum album (SAP) is a complex mixture of triterpene saponins from Gypsophila paniculata L. Although most of the saponins from SAP are characterized, the separation of pure saponins remains time consuming and costly, involving different chromatographic techniques. Recently it was shown that SAP

Elevation of lysosomal enzymes in primary Lewis lung tumor correlated with the initiation of metastasis.

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Lysosomal enzymes were elevated about two-fold in primary s.c. Lewis lung carcinoma as compared with metastatic nodules in the lung. In a time course experiment, a general two-fold elevation of acid phosphatase and several glycosidases was observed in the primary tumor between the 14th and 17th

Structures of the oligosaccharide chains of two forms of alpha 1-acid glycoprotein purified from liver metastases of lung, colon, and breast tumors.

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Two forms of alpha 1-acid glycoprotein with common immunological determinants and almost identical amino acid compositions but different amounts of carbohydrate were isolated from liver metastases of primary colon, lung, and breast tumors by extraction with perchloric acid, gel filtration on

Tumor stasis factor (TSF): a possible mechanism for the regulation of tumor cell proliferation.

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A new class of factors that regulates tumor cell division in vitro can be isolated from fresh and cultured tumor cells by 3 M KCl extraction. Tumor stasis factors (TSF) inhibiting cultured tumor cell proliferation were extracted from 8 of 11 fresh human tumors and 2 cultured tumor cell lines. TSF

Engineering novel S-glycosidase activity into extremo-adapted β-glucosidase by rational design.

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The breakdown of sulphur glycosidic bonds in thioglycosides can produce isothiocyanate, a chemoprotective agent linked to the prevention of cancers; however, only a handful of enzymes have been identified that are k0nown to catalyse this reaction. Structural studies of the myrosinase enzyme, which

Inhibitors against glycosidases as medicines.

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Glycosidases mediate the digestion of oligosaccharides in the small intestine as well as the processing of cell surface oligosaccharides, which play important roles in cell to cell recognition during infections, metastasis, and immune responses. Thus, agents that control the activities of

Timosaponin AIII is preferentially cytotoxic to tumor cells through inhibition of mTOR and induction of ER stress.

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The aqueous extract of Anemarrhena asphodeloides (BN108) induces apoptosis in various cancer cell lines but is significantly less cytotoxic in non-transformed cells. Chemical fractionation of BN108 showed that its cytotoxicity is associated with timosaponins, steroidal saponins of coprostane type.

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