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Страна 1 од 27 резултати
Differential response of human melanoma and Ehrlich ascites cells in vitro to the ribosome-inactivating protein luffin.
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The cytotoxicity and inhibitory effect on proliferation of the type 1 ribosome-inactivating protein luffin purified from the seeds of Luffa aegyptiaca were investigated both in human metastatic melanoma cells and in murine Ehrlich ascites tumour cells. Results indicate that luffin from the seeds of
[Purification and partial characterization of luffin P1, a peptide with translational inhibitory activity and trypsin inhibitory activity, from seeds of Luffa cylindrica].
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A peptide, luffin P1, from seeds of Luffa cylindrica, was purified by ammonia sulfate precipitation, CM-52 ion exchange chromatography, Blue-gel affinity chromatography and FPLC Mono S ion exchange chromatography. Its molecular weight was 5226.5 as determined by MALDI-TOF-MS analysis. The sequence
Luffin-S--a small novel ribosome-inactivating protein from Luffa cylindrica. Characterization and mechanism studies.
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We purified and characterized a novel RIP (ribosome inactivating protein), Luffin-S from the seeds of Luffa cylindrica. Different from Luffin-A and B, which are RNA N-glycosidases with molecular weights of 27 and 28 kDa, respectively, Luffin-S has an M.W. of only approx. 10 kDa, much smaller than
Identification of lysine residue at or near active site of luffin-a, a ribosome-inactivating protein from seeds of Luffa cylindrica.
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Luffin-a, a ribosome-inactivating protein from the seeds of sponge gourd (Luffa cylindrica), was modified with 2,4,6-trinitrobenzenesulfonic acid (TNBS) at pH 8.0 and 20 degrees C. The inhibitory activity of the modified luffin-a on protein synthesis using rabbit reticulocyte lysate was lost rapidly
In vitro Inhibition of Human Melanoma Cells by Immunotoxin Luffin B-Ng76.
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Luffin B, a plan single-chain ribosome inactivating protein, was purified from seeds of Luffa cylindrica by Blue Sepharose CL-6B affinity chromatography. An immunotoxin was constructed with luffin B and Ng76, a monoclonal antibody to human melanoma cell M(21). Luffin B-Ng76 showed 4 000-fold more
Antiproliferative effect and apoptotic response in vitro of human melanoma cells to liposomes containing the ribosome-inactivating protein luffin.
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The present study describes the liposome-mediated delivery of the type 1 ribosome-inactivating protein luffin to human melanoma cells in vitro. Luffin from Luffa cylindrica seeds has been successfully incorporated into lecithin/cholesterol and lecithin/cholesterol/dicetylphosphate negatively charged
Preparation and Use of a Monoclonal Antibodyagainst Luffin b.
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Luffin b is one of the most toxic single chain plant ribosome inactivating proteins. It has been successfully used to prepare an immunotoxin against human melanoma cells. Two strains of hybridomas (1E5 and 2E1) were screened out using cell fusion technique which steadily secreted monoclonal
A novel recombinant immunotoxin with the smallest ribosome-inactivating protein Luffin P1: T-cell cytotoxicity and prolongation of allograft survival.
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In the creation of stable tolerance to MHC-incompatible allografts, reducing the large mass of donor-reactive cells via apoptosis is often required. Apoptosis induction by immunotoxins targeting surface molecules specifically presented on donor-reactive cytopathic T effector (T(eff)) cells is a
Complete amino acid sequence of luffin-b, a ribosome-inactivating protein from sponge gourd (Luffa cylindrica) seeds.
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The complete amino acid sequence of luffin-b has been determined. All the twenty-seven tryptic peptides were isolated by reverse-phase HPLC from the tryptic digests of intact luffin-b and one of its CNBr fragments (CB4), and sequenced using the DABITC/PITC double coupling method. The overlap of
Complete amino acid sequence of luffin-a, a ribosome-inactivating protein from the seeds of sponge gourd (Luffa cylindrica).
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The complete amino acid sequence of luffin-a has been determined. Twenty-two peptides were isolated from the tryptic digest of luffin-a and sequenced employing the DABITC/PITC double coupling method. Overlaping of these peptides was achieved by analyzing the chymotryptic peptides or CNBr-fragments
Isolation, Purification and Characterization of a Group of Novel Small Molecular Ribosome Inactivating Protein -- LuffinS from Seeds of Luffa cylindrica.
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A group of novel RIPs--LuffinS(1), LuffinS(2), LuffinS(3) (MW about 8 kD) were purified by ammonia sulfate precipitation, CM-52 chromatography, HRLC size chromatography and Mono S FPLC. LuffinS(1), LuffinS(2) and LuffinS(3) have similar weight of about 8kD, and their N-terminal amino acid is Ala,
Chemical modifications of momordin-a and luffin-a, ribosome-inactivating proteins from the seeds of Momordica charantia and Luffa cylindrica: involvement of His140, Tyr165, and Lys231 in the protein-synthesis inhibitory activity.
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Effects of chemical modifications on the protein-synthesis inhibitory (PSI) activities of momordin-a and luffin-a were investigated. Treatment with a 50-fold excess of diethylpyrocarbonate at pH 6.5 modified one histidine residue in momordin-a and luffin-a and reduced their PSI activities to 10% and
Cloning and Expression of Luffin-b cDNA from the Seeds of Luffa cylindrica.
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Luffin-b with Mr. 28 kD, isolated from the seeds of Luffa cylindrica,is one of the most toxic single chain plant ribosome inactivating proteins. The cDNA sequence of luffin-b was already reported by Kataoka in 1992. In this work, the luffin-b gene(lufB) coding sequence was cloned from the fresh
Cloning and soluble expression of mature alpha-luffin from Luffa cylindrica and its antitumor activities in vitro.
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Luffin-a, a single-chain Type I ribosome-inactivating protein, which is known to be the most toxic of the luffin family and apparently possesses antitumor activity, was isolated from Luffa cylindrica seeds. In the present study, mature alpha-luffin was cloned from L. cylindrica and it was found that
Purification and characterization of Luffin P1, a ribosome-inactivating peptide from the seeds of Luffa cylindrica.
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A peptide designated Luffin P1 was purified from the seeds of Luffa cylindrica. Its molecular mass was determined to be 5226.1 Da by MALDI-TOF MS analysis. The purified Luffin P1 shows a strong inhibitory activity on protein synthesis in the cell-free rabbit reticulocyte lysate with IC(50) of 0.88
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