Search results for "viruses"
showing 10 items of 1182 documents
Non-structural proteins P17 and P33 are involved in the assembly of the internal membrane-containing virus PRD1.
2015
AbstractBacteriophage PRD1, which has been studied intensively at the structural and functional levels, still has some gene products with unknown functions and certain aspects of the PRD1 assembly process have remained unsolved. In this study, we demonstrate that the phage-encoded non-structural proteins P17 and P33, either individually or together, complement the defect in a temperature-sensitive GroES mutant of Escherichia coli for host growth and PRD1 propagation. Confocal microscopy of fluorescent fusion proteins revealed co-localisation between P33 and P17 as well as between P33 and the host chaperonin GroEL. A fluorescence recovery after photobleaching assay demonstrated that the diff…
Cooperation between Different CRISPR-Cas Types Enables Adaptation in an RNA-Targeting System
2021
CRISPR-Cas systems are immune systems that protect bacteria and archaea against their viruses, bacteriophages. Immunity is achieved through the acquisition of short DNA fragments from the viral invader’s genome.
Interacción insecto-baculovirus. Aplicaciones en la mejora de baculovirus como vector para la expresión heteróloga de proteínas.
2018
Los baculovirus forman un amplio grupo de virus patógenos de insectos que se caracterizan por su elevada especificidad. Su principal aplicación es su uso como agente bioinsecticida frente a diferentes plagas agrícolas, aunque algunas de sus características han permitido el desarrollo de tecnologías que permiten usar los baculovirus como vectores para la expresión heteróloga de proteínas, así como vectores para su uso en terapia génica. El sistema de expresión basado en baculovirus, conocido como BEVS (Baculovirus Expression Vector System), fue desarrollado en los años 80 y desde entonces ha permitido la expresión de gran diversidad de proteínas recombinantes en cultivos celulares de insecto…
Development of biotechnological tools for studying infectious pathways of canine and human parvoviruses
2005
Leona Gilbertin väitöskirjatyö antaa uutta tietoa parvovirusten pinnanmuokkauksesta ja hyödyllisyydestä virologian, geeniterapian ja biolääketieteen sovelluksissa. Parvovirukset ovat pieniä, yksisäikeistä DNA:ta sisältäviä eläinviruksia, jotka kykenevät infektoimaan isäntänsä soluja. Ihmisillä ne aiheuttavat ihottumaa sekä nivelkipuja. Tutkimuksessa tuotettiin bakuloviruksen avulla hyönteissoluissa sekä koiran että ihmisen parvoviruksen rakenneproteiineista fluoresloivia fuusioproteiineja. Selvisi, että parvoviruksen pinta sopii hyvin muokkaamiseen ja vieraiden molekyylien ilmentämiseen. Lisäksi havaittiin, että bakuloviruksia voidaan käyttää geeninsiirtovälineenä mm. parvovirusproteiinien …
Bacteriophage Resistance Affects Flavobacterium columnare Virulence Partly via Mutations in Genes Related to Gliding Motility and Type IX Secretion S…
2020
AbstractIncreasing problems with antibiotic resistance has directed interest towards phages as tools to treat bacterial infections in the aquaculture industry. However, phage resistance evolves rapidly in bacteria posing a challenge for successful phage therapy. To investigate phage resistance in the fish pathogenic bacterium Flavobacterium columnare, two phage-sensitive, virulent wild-type isolates, FCO-F2 and FCO-F9, were exposed to phages and subsequently analyzed for bacterial viability and colony morphology. Twenty-four phage-exposed isolates were further characterized for phage resistance, antibiotic susceptibility, motility, adhesion and biofilm formation on polystyrene surface, prot…
Pityriasis lichenoides chronica associated with herpes simplex virus type 2.
2012
Introduction. Pityriasis lichenoides is a rare, acquired spectrum of skin conditions of an unknown etiology.Case Report. A 28-year-old man presented with recurrent outbreaks of herpes simplex virus associated with the onset of red-to-brown maculopapules located predominantly in trunk in each recurrence. Positive serologies to herpes simplex virus type 2 were detected. Histopathological examination of one of the lesions was consistent with a diagnosis of pityriasis lichenoides chronica.Discussion. Pityriasis lichenoides is a rare cutaneous entity of an unknown cause which includes different clinical presentations. A number of infectious agents have been implicated based on the clustering of …
Insecticidal activity of Vip3Aa, Vip3Ad, Vip3Ae, and Vip3Af from Bacillus thuringiensis against lepidopteran corn pests.
2012
Vip3Aa, Vip3Ad, Vip3Ae, and Vip3Af proteins from Bacillus thuringiensis were tested for their toxicity against Spodoptera frugiperda and Agrotis ipsilon. Vip3Ad was non-toxic to the two species. Vip3Ae and Vip3Af were significantly more toxic than Vip3Aa against S. frugiperda, both as protoxins and as toxins. Against A. ipsilon, Vip3Ae protoxin was more toxic than Vip3Aa and Vip3Af protoxins. Purification by metal-chelate affinity chromatography significantly affected Vip3Ae toxicity against the two insect species.
Nucleoprotein-specific nonneutralizing antibodies speed up LCMV elimination independently of complement and FcγR
2013
CD8(+) T cells have an essential role in controlling lymphocytic choriomeningitis virus (LCMV) infection in mice. Here, we examined the contribution of humoral immunity, including nonneutralizing antibodies (Abs), in this infection induced by low virus inoculation doses. Mice with impaired humoral immunity readily terminated infection with the slowly replicating LCMV strain Armstrong but showed delayed virus elimination after inoculation with the faster replicating LCMV strain WE and failed to clear the rapidly replicating LCMV strain Docile, which is in contrast to the results obtained with wild-type mice. Thus, the requirement for adaptive humoral immunity to control the infection was dep…
Effect of poly(I).poly(C12U) (Ampligen) on enteric virus (rotavirus, poliovirus and Coxsackie B3 virus) infections
1994
The effects of poly(1)-poly(C 12 U) (Ampligen) on infections with enteric viruses (rotavirus, poliovirus and Coxsackie B3 virus) were studied in vitro. Ampligen exhibited antiviral activity against rotavirus, especially when treatment was performed prior to inoculation of the virus. It was partially effective against Coxsackie B3 virus, but not against poliovirus. It is suggested that the observed effects may be due to the production of interferon induced by Ampligen
Molecular Virology of Enteric Viruses (with Emphasis on Caliciviruses)
2006
Human caliciviruses are members of the family Caliciviridae and are responsible for a majority of the outbreaks of acute nonbacterial gastroenteritis. In fact, they now are considered a common cause of sporadic cases of diarrhea in the community (Glass et al., 2000b; Koopmans et al., 2002; Lopman et al., 2002; Hutson et al., 2004). These viruses were implicated in as many as 95% of the reported viral gastroenteritis outbreaks examined over a 4.5-year period in the United States (Fankhauser et al., 2002), and similar high incidence rates have been found in other studies (Maguire et al., 1999; Glass et al., 2000b; Koopmans et al., 2000; Lopman et al., 2003). Common features of the Calicivirid…