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A collection of about 200 actinomycete strains was screened for the ability to grow on fragmented Phytophthora mycelium and to produce metabolites that inhibit Phytophthora growth. Thirteen strains were selected, and all produced (beta)-1,3-, (beta)-1,4-, and (beta)-1,6-glucanases. These enzymes could hydrolyze glucans from Phytophthora cell walls and cause(More)
We have investigated the role of poly(ADP)-ribosylation of adenoviral proteins in virus infection. Viral core proteins V and the precursor to protein VII were shown to be in vivo and in vitro acceptors of ADP-ribose. In vivo ADP-ribosylation was restricted to viral proteins as the histones were not labeled during the late phase of infection. The(More)
The structure of adenovirus chromatin in infected cells was studied by micrococcal nuclease digestion and hybridization with virus-specific probes. In the early phase of infection (5 h) a significant proportion of viral molecules was organized like actively transcribed cellular chromatin. As expected for a transcriptionally active population of molecules,(More)
We compared some of the biological and structural features of an adenovirus type 2 temperature-sensitive mutant (ts1) defective for maturation cleavages and uncoating with wild-type (WT) virus. The cleavage defect caused ts1 to produce virions at 39 degrees that contained five precursor proteins (pTP, 11K, PVI, PVII, PVIII). Coinfection of cells with such(More)
The actI gene, encoding a component of the actinorhodin polyketide synthase of Streptomyces coelicolor, was used to identify and clone a homologous 11.7 kb BamHI DNA fragment from Saccharopolyspora hirsuta 367. The cloned fragment complemented actinorhodin production in a strain of Streptomyces coelicolor bearing a mutant actI gene. The DNA sequence of a(More)
Adenovirus E1A genes possess transcriptional activation and repression activities. Three major gene products have been characterized, derived from the 13S, 12S and 9S mRNAs. Using transient expression assays in HeLa cells, we have investigated the effect of these gene products on the activity of the nine major Ad2 (or Ad5) promoters driving the expression(More)
Adenovirus contains two nuclear oncogenes, the EIA and EIB genes, which cooperatively can transform cells through mechanisms that are not understood. The transcriptional activities of the E1A gene (transactivation and repression) are well studied. Using transient expression assays, we show here that the 19,000-Da E1B gene product can also activate all the(More)
The nuclear matrix has been implicated in several important cellular processes. In this paper, we investigate the role of the nuclear matrix in adenovirus type 2 assembly. Electron microscopic examination of nuclear matrices isolated from adenovirus infected Hep-2 cells clearly reveals that late in the lytic cycle, adenovirus capsids are intimately(More)
Bacteriophage JHJ-1 was isolated from Saccharopolyspora hirsuta strain 367 NRRL 12045 as an endogenous but virulent phage. The plaque size was not self-limiting, since a few p.f.u. could completely lyse a lawn. Electron microscopy showed that this phage belonged to group B of Bradley's morphological classification. The JHJ-1 genome is a linear DNA molecule(More)