Browsing by Subject "Support, U.S. Gov't, P.H.S."

Article

The A and B fragments of normal type I procollagen have a similar thermal stability to proteinase digestion but are selectively destabilized by structural mutations

Constantinou-Deltas, Constantinos D.; VOGEL, B. E.; JEFFREY, J. J.; PROCKOP, D. J. (1987)

Previous studies demonstrated that the thermal stability of the procollagen triple helix can be assayed by digesting the protein for short periods with high concentrations of trypsin and chymotrypsin. Here we cleaved human ...

Article

Altered Phosphorylation, Biosynthesis and Degradation of the 170 kDa Isoform of Topoisomerase II in Amsacrine-Resistant Human Leukemia Cells

Ganapathi, R.; Zwelling, L.; Constantinou, Andreas I.; Ford, J.; Grabowski, D. (1993)

Resistance to amsacrine in HL-60/AMSA is 50-100 fold compared to the parental HL-60/S cells. Synthesis and phosphorylation of topoisomerase II (TOPO II) were 2-3 fold lower in HL-60/AMSA compared to HL-60/S cells metabolically ...

Article

C2, An Unusual Filamentous Bacterial Virus: Protein Sequence and Conformation, DNA Size and Conformation, and Nucleotide/Subunit Ratio

Kostrikis, Leontios G.; Reisberg, S. A.; Day, L. A.; Kim, H. -Y; Shin, S. (1995)

Inovirus C2 is 1295 nm long and 6.8 nm in diameter, and its mass is 24 million Da. Its genome is a topologically circular, single-stranded DNA molecule of 8100 nucleotides. The DNA is packed in the virion as two antiparallel ...

Article

Cancer chemopreventive activity of brassinin, a phytoalexin from cabbage

Mehta, R. G.; Liu, J.; Constantinou, Andreas I.; Thomas, C. F.; Hawthorne, M.; You, M.; Gerhäuser, C.; Pezzuto, J. M.; Moon, R. C.; Moriarty, R. M. (1995)

Brassinin [3-(S-methyldithiocarbamoyl aminomethyl indole], a phytoalexin first identified as a constituent of cabbage, was synthesized and evaluated for cancer chemopreventive activity. Dose-dependent inhibition of ...

Article

Chemopreventive effects of soy protein and purified soy isoflavones on DMBA-induced mammary tumors in female Sprague-Dawley rats

Constantinou, Andreas I.; Lantvit, D.; Hawthorne, M.; Xu, X.; Van Breemen, R. B.; Pezzuto, J. M. (2001)

There are conflicting reports on the effect of soy and its components on mammary carcinogenesis in adult female rats, mainly because of different rodent models that are used in chemoprevention studies. The present study ...

Article

The Dietary Anticancer Agent Ellagic Acid is a Potent Inhibitor of DNA Topoisomerases in Vitro

Constantinou, Andreas I.; Mehta, R.; Runyan, C.; Moon, R.; Stoner, G. D.; Rao, K. (1995)

Ellagic acid and 12 related agents have been tested for their ability to inhibit the activities of human DNA topoisomerase (topo) I and IL Using specific in vitro assays, we found ellagic acid and flavellagic acid to be ...

Article

Effect of the calmodulin inhibitor trifluoperazine on phosphorylation of P-glycoprotein and topoisomerase II: Relationship to modulation of subcellular distribution, DNA damage and cytotoxicity of doxorubicin in multidrug resistant L1210 mouse leukemia cells

Ganapathi, R.; Kamath, N.; Constantinou, Andreas I.; Grabowski, D.; Ford, J.; Anderson, A. (1991)

Article

The effect of topoisomerase inhibitors on the expression of differentiation markers and cell cycle progression in human K-562 leukemia cells

Constantinou, Andreas I.; Grdina, D.; Kiguchi, K.; Huberman, E. (1992)

Treatment of human K-562-J leukemia cells for 1 h with the topoisomerase II-reactive drugs VP-16, VM-26, or mAMSA resulted in a dose-dependent inhibition of proliferation and in an increase in the percentage of cells ...

Article

Enthalpic Contribution to Protein Stability: Insights from Atom-Based Calculations and Statistical Mechanics

Lazaridis, T.; Archontis, Georgios Z.; Karplus, M. (1995)

This chapter discusses published analyses of protein stability based on model compound data and outlines the assumptions that have been made. The enthalpy of protein folding is considered and a thermodynamic cycle is used ...

Article

An error in dystrophin mRNA processing in golden retriever muscular dystrophy, an animal homologue of Duchenne muscular dystrophy

Sharp, N. J. H.; Kornegay, J. N.; Van Camp, S. D.; Herbstreith, M. H.; Secore, S. L.; Kettle, S.; Hung, W. -Y; Constantinou-Deltas, Constantinos D.; Dykstra, M. J.; Roses, A. D.; Bartlett, R. J. (1992)

Golden retriever muscular dystrophy (GRMD) is a spontaneous, X-linked, progressively fatal disease of dogs and is also a homologue of Duchenne muscular dystrophy (DMD). Two-thirds of DMD patients carry detectable deletions ...

Article

Export of infectious particles by Escherichia coli transfected with the RF DNA of Pf1, a virus of Pseudomonas aeruginosa strain K

Kostrikis, Leontios G.; Reisberg, S. A.; Simon, M. N.; Wall, J. S.; Day, L. A. (1991)

Pf1 is a filamentous, single‐stranded DNA virus that has Pseudomas aeruginosa (strain K) as host. It is the longest of the filamentous bacterial viruses, and the DNA within it has the most extended conformation known. Pfl ...

Article

Expression of type I procollagen genes.

Prockop, D. J.; Kadler, K. E.; Hojima, Y.; Constantinou-Deltas, Constantinos D.; Dombrowski, K. E.; Kuivaniemi, H.; Tromp, G.; Vogel, B. (1988)

All of the type I collagen in connective tissue is the product of one structural gene for the pro alpha 1(I) chain and another for the pro alpha 2(I) chain of type I procollagen. An intriguing question therefore is how the ...

Article

Flavonoids as DNA topoisomerase antagonists and poisons: Structure-activity relationships

Constantinou, Andreas I.; Mehta, R.; Runyan, C.; Rao, K.; Vaughan, A.; Moon, R. (1995)

Selected flavonoids were tested for their ability to inhibit the catalytic activity of DNA topoisomerase (topo) I and II. Myricetin, quercetin, fisetin, and morin were found to inhibit both enzymes, while phloretin, ...

Article

G to A polymorphism in exon 45 of the COL1A1 gene

Sokolov, B. P.; Constantinou-Deltas, Constantinos D.; Tsuneyoshi, T.; Zhuang, J.; Prockop, D. J. (1991)

Article

Genetic analysis of human immunodeficiency virus type 1 strains from patients in cyprus: Identification of a new subtype designated subtype I

Kostrikis, Leontios G.; Bagdades, Evis K.; Cao, Yun Zhen; Zhang, Lin Qi; Dimitriou, D.; Ho, David D. (1995)

DNA sequences encoding the C2 to V3 region of envelope glycoprotein gp120 of human immunodeficiency virus type 1 (HIV-1) were amplified by PCR from uncultured peripheral blood mononuclear cells obtained from 24 of 25 HIV-1- ...

Article

Genistein as an Inducer of Tumor Cell Differentiation: Possible Mechanisms of Action

Constantinou, Andreas I.; Huberman, E. (1995)

Decreased activity of either topoisomerases or tyrosine kinases has been implicated in the differentiation of a number of cell types. It is therefore conceivable that genistein, because of its reported ability to inhibit ...

Article

The identification and characterization of KRAB-domain-containing zinc finger proteins

Constantinou-Deltas, Constantinos D.; Gilbert, J.; Bartlett, R. J.; Herbstreith, M.; Roses, A. D.; Lee, J. E. (1992)

The zinc finger motif is a highly conserved tandemly repeated sequence of 28-30 amino acids that was first identified in transcription factor TFIIIA from Xenopus laevis. Subsequently, similar motifs were found and characterized ...

Article

Inhibition of topoisomerase IIα activity in CHO K1 cells by 2- [(aminopropyl)amino]ethanethiol (WR-1065)

Grdina, D. J.; Constantinou, Andreas I.; Shigematsu, N.; Murley, J. S. (1994)

The aminothiol 2-[(aminopropyl)amino]ethanethiol (WR-1065) is the active thiol of the clinically studied radioprotective agent S-2-(3- aminopropylamino)ethylphosphorothioic acid (WR-2721). WR-1065 is an effective radiation ...

Article

A lethal variant of osteogenesis imperfecta has a single base mutation that substitutes cysteine for glycine 904 of the α1(I) chain of type I procollagen. The asymptomatic mother has an unidentified mutation producing an overmodified and unstable type I procollagen

Constantinou-Deltas, Constantinos D.; Nielsen, K. B.; Prockop, D. J. (1989)

A fraction of the proα1(I) and proα2(I) chains in type I procollagen synthesized by the fibroblasts from a proband with a lethal variant of osteogenesis imperfecta were overmodified by posttranslational reactions. After ...

Article

Mutation analysis of coding sequences for type I procollagen in individuals with low bone density

Spotila, L. D.; Colige, A.; Sereda, L.; Constantinou-Deltas, Constantinos D.; Whyte, M. P.; Riggs, L. B.; Shaker, J. L.; Spector, T. D.; Hume, E.; Olsen, N.; Attie, M.; Tenenhouse, A.; Shane, E.; Briney, W.; Prockop, D. J. (1994)

Mutations in one of the two genes encoding type I procollagen (COL1A1 and COL1A2) are frequently the cause of osteogenesis imperfecta (OI), a disorder characterized by brittle bones. Here we tested whether patients with ...