abstract：:The following pair of articles, the first by Gil Segal and Howard Shuman, and the second by James Kirby and Ralph Isberg (Trends Microbiol. 6, 256-258), explore the genetics and function of the icm/dot genes of Legionella pneumophila. This gene family is implicated in several aspects of virulence and appears to consti...

journal_title：Trends in microbiology

authors： Segal G,Shuman HA

更新日期：1998-07-01 00:00:00

abstract：:Improved fluorescence techniques for visualizing proteins in whole bacterial cells have resulted in recent breakthroughs in our understanding of chromosome segregation and cytokinesis in prokaryotes. The dynamics and localization of some of these proteins reveal surprisingly cytoskeletal-like behavior. ...

journal_title：Trends in microbiology

authors： Margolin W

更新日期：1998-06-01 00:00:00

abstract：:N2-fixing bacteria such as Azoarcus spp., Herbaspirillum spp, and Acetobacter diazotrophicus can infect the interior of gramineous plants without causing symptoms of plant disease but do not survive in soil. Like phytopathogens, they can penetrate into central tissues and spread systemically. There is no evidence for ...

journal_title：Trends in microbiology

authors： Reinhold-Hurek B,Hurek T

更新日期：1998-04-01 00:00:00

abstract：:Superantigens are a diverse collection of molecules that share the ability to activate specific lymphocyte subsets. In animal models, many of these molecules delete T-cell populations or render them anergic. The clinical impact of superantigens is significant, but much of their pathophysiology remains unclear. ...

journal_title：Trends in microbiology

authors： Michie CA,Cohen J

更新日期：1998-02-01 00:00:00

abstract：:DNA vaccines can induce potent humoral and cellular immune responses without any additional adjuvant. Recent studies indicate that unmethylated CpG dinucleotides within DNA vaccines are immune stimulatory and exert an essential endogenous adjuvant activity. These CpG motifs can be added deliberately to DNA or conventi...

journal_title：Trends in microbiology

authors： Krieg AM,Yi AK,Schorr J,Davis HL

更新日期：1998-01-01 00:00:00

abstract：:The rumen of sheep and cattle represents a mobile, self-sustaining fermentation system for plant material. Analysis of the rumen flora continues to provide fundamental knowledge of anaerobic microbiology and is now yielding microbial genes that have potential in biotechnology. Recent research has provided fascinating ...

journal_title：Trends in microbiology

authors： Flint HJ

更新日期：1997-12-01 00:00:00

abstract：:Rolling circle DNA replication is inherently continuous and unregulated. This 'go-for-broke' strategy works well for lytic phages but is suicidal for plasmids that must coexist with their host. Plasmids have consequently evolved elaborate copy number control systems that operate at the transcriptional, translational a...

journal_title：Trends in microbiology

authors： Rasooly A,Rasooly RS

更新日期：1997-11-01 00:00:00

abstract：:Diverse enveloped viruses enter host cells by fusing their envelopes with cell membranes. The mechanisms of merger of lipid bilayers of two membranes mediated by influenza hemagglutinin and other viral fusion proteins apparently involve local lipidic connections that evolve into a bilayer septum in which a pore forms ...

journal_title：Trends in microbiology

authors： Melikyan GB,Chernomordik LV

更新日期：1997-09-01 00:00:00

abstract：:The evolution of virulence in Salmonella is driven by horizontal gene transfer. This has given rise to highly flexible pathogens that are able to colonize new niches and extend their host range. Tracing the record of horizontal gene transfer can provide clues to the virulence factors that contribute to the formation o...

journal_title：Trends in microbiology

authors： Bäumler AJ

更新日期：1997-08-01 00:00:00

abstract：:Cyclopentenone prostanoids inhibit virus replication by turning on an intracellular defence response that involves the induction of cytoprotective heat-shock proteins, the modification of viral glycoprotein maturation and the control of NF-kappa B activation. These molecules represent an interesting model for the deve...

journal_title：Trends in microbiology

authors： Santoro MG

更新日期：1997-07-01 00:00:00

abstract：:Strains of Helicobacter pylori from patients with peptic ulcer disease and gastric cancer contain a 40-kb fragment of DNA that is not present in isolates from carriers with asymptomatic infections. The discovery of the cag pathogenicity island suggests that virulence has evolved by quantum leaps through the inheritanc...

journal_title：Trends in microbiology

authors： Covacci A,Falkow S,Berg DE,Rappuoli R

更新日期：1997-05-01 00:00:00

abstract：:Virulence of many bacterial pathogens is based, at least in part, on the action of phospholipases. The consequences may be immediate and direct, as in the action of Clostridium perfringens alpha toxin on red cells or platelets, or subtle, as with phosphatidylinositol-specific phospholipases of Listeria monocytogenes a...

journal_title：Trends in microbiology

authors： Songer JG

更新日期：1997-04-01 00:00:00

abstract：:Oncogenic viruses have evolved direct and indirect mechanisms to overcome the tumour suppressor p53. Fortunately, tumour development is limited by the narrow cell tropisms of the viruses concerned and the host immune response. However, such viruses are helping to elucidate the p53 response pathway and may play a futur...

journal_title：Trends in microbiology

authors： Neil JC,Cameron ER,Baxter EW

更新日期：1997-03-01 00:00:00

abstract：:Protozoans of the genus Plasmodium are the causative agents of malaria; they have a complex life cycle involving vertebrate and arthropod hosts and have three distinct invasive stages. Although the invasive stages probably invade cells using similar mechanisms, each stage has a different host cell specificity and util...

journal_title：Trends in microbiology

authors： Sinnis P,Sim BK

更新日期：1997-02-01 00:00:00

abstract：:Recent American successes against poliomyelitis and measles have been attributed to repeated 'pulse' vaccination campaigns. Whilst logistic and economic constraints will be crucial, a deeper epidemiological understanding of the mechanism, strengths and weaknesses of pulse vaccination will optimize the chances of succe...

journal_title：Trends in microbiology

authors： Nokes DJ,Swinton J

更新日期：1997-01-01 00:00:00

abstract：:One strategy for neutralizing retroviral infectivity is to induce the incorporation of lethal fusion proteins, such as capsid protein-nuclease fusions, into the virion during the normal viral assembly process. Genes encoding such antiviral fusion proteins must be nontoxic to the host, lethal to the virus, and must be ...

journal_title：Trends in microbiology

authors： Boeke JD,Hahn B

更新日期：1996-11-01 00:00:00

abstract：:For many years, there has been controversy over the role of antibodies in immunity to Candida, but recently specific antibodies to mannoproteins and hsp90 have been shown to be protective against murine candidiasis. Combined with technical advances in antibody engineering, this raises the possibility of harnessing suc...

journal_title：Trends in microbiology

authors： Matthews R,Burnie J

更新日期：1996-09-01 00:00:00

abstract：:Adaptation of rhizobia to a symbiotic life style and synthesis of the nitrogen-fixing apparatus are coordinated with nodule development by the microaerobic conditions prevailing in the central nodule tissue. Sensing and transduction of the "low oxygen' signal involves similar regulatory elements in different rhizobia,...

journal_title：Trends in microbiology

authors： Fischer HM

更新日期：1996-08-01 00:00:00

abstract：:It is usually assumed that most prokaryotes, when given appropriate nutrients, can grow and divide in the absence of other cells of the same species. However, recent studies have suggested that, for growth, prokaryotes need to communicate with each other using signalling molecules, and a variety of 'eukaryotic' hormon...

journal_title：Trends in microbiology

authors： Kaprelyants AS,Kell DB

更新日期：1996-06-01 00:00:00

abstract：:Entomopathogenic fungi are attracting attention as potential biological control agents of insect pests. The mechanisms of pathogenesis have parallels with those of some plant-pathogenic fungi, particularly in the areas of formation of an infection structure, entry into the host and toxin-mediated host death. Understan...

journal_title：Trends in microbiology

authors： Clarkson JM,Charnley AK

更新日期：1996-05-01 00:00:00

abstract：:Intracellular pathogens customize the composition and function of the vacuoles they occupy, and can arrest or distort vacuolar maturation. In doubly infected cells, vacuoles that contain two different parasites can be used to test for exclusionary mechanisms, for expression of vacuolar phenotypes that permit or restri...

journal_title：Trends in microbiology

authors： Rabinovitch M,Veras PS

更新日期：1996-04-01 00:00:00

abstract：:Barriers to chromosomal gene transfer between bacterial species control their genetic isolation. These barriers, such as different microhabitats, the host ranges of genetic exchange vectors and restriction-modification systems, limit gene exchange, but the major limitation is genomic sequence divergence. The mismatch-...

journal_title：Trends in microbiology

authors： Matic I,Taddei F,Radman M

更新日期：1996-02-01 00:00:00

abstract：:Retroviruses, like other RNA viruses, mutate at very high rates (0.05-1 mutations per genome per replication cycle) and exist as complex genetically heterogeneous populations ('quasispecies') that are ever changing. De novo mutations are generated by inherently error-prone steps in the retroviral life cycle that intro...

journal_title：Trends in microbiology

authors： Preston BD,Dougherty JP

更新日期：1996-01-01 00:00:00

abstract：:Hepatitis C virus populations in infected individuals consist of quasispecies with diverse mutations. These quasispecies have different biological properties, and the analysis of these variants has led to new interpretations of viral persistence, carcinogenesis and resistance to interferon therapy. ...

journal_title：Trends in microbiology

authors： Enomoto N,Sato C

更新日期：1995-11-01 00:00:00

abstract：:The spectacular failure of the existing bacille Calmette-Guérin (BCG) vaccine in recent tuberculosis-control trials has prompted a search for potential replacements. Imaginative approaches currently under development include the modulation of BCG by the production of auxotrophic mutants or cytokine-secreting recombina...

journal_title：Trends in microbiology

authors： Orme IM

更新日期：1995-10-01 00:00:00

abstract：:Measles virus gene expression is attenuated in neural cells by mechanisms that affect both viral transcription and translation. Host enzymes that hypermutate viral genes, and those induced by cytokines, may act cooperatively to slow viral replication and to favor persistent measles virus infections in the human centra...

journal_title：Trends in microbiology

authors： Johnston IC,Dunster LM,Schneider-Schaulies J,Schneider-Schaulies S

更新日期：1995-09-01 00:00:00

abstract：:Filamentous phages are small, highly evolved parasites that can reproduce and disseminate without killing their host. During assembly, virion proteins are transferred from the host membrane to the single-stranded DNA phase genome and simultaneously secreted from the cell. Filamentous phage assembly shares certain feat...

journal_title：Trends in microbiology

authors： Russel M

更新日期：1995-06-01 00:00:00

abstract：:Intestinal epithelial cells secrete a spectrum of chemoattractant and proinflammatory cytokines after invasion by bacteria. We suggest the novel concept that epithelial cells not only act as a mechanical barrier to invasive bacteria, but that they also signal the presence of invasive pathogens to the mucosal immune an...

journal_title：Trends in microbiology

authors： Eckmann L,Kagnoff MF,Fierer J

更新日期：1995-03-01 00:00:00

abstract：:Resistance to tetracycline is generally due either to energy-dependent efflux of tetracycline or to protection of the bacterial ribosomes from the action of tetracycline. The genes that encode this resistance are normally acquired via transferable plasmids and/or transposons. Tet determinants have been found in a wide...

journal_title：Trends in microbiology

authors： Roberts MC

更新日期：1994-10-01 00:00:00

abstract：:Multidrug resistance in tumor cells is often caused by the increased efflux of a wide variety of drugs, mediated by P glycoprotein, a member of the superfamily of ATP-binding cassette (ABC) transporters. The genes encoding members of this superfamily have also been isolated from drug-resistant microorganisms, and the ...

journal_title：Trends in microbiology

authors： Ouellette M,Légaré D,Papadopoulou B

更新日期：1994-10-01 00:00:00

abstract：:Rhizobia are soil bacteria that can become endosymbionts, reducing atmospheric nitrogen within nodules formed on the roots of legume plants. During tissue and cell invasion, bacterial cell-surface components adapt the bacterium to survive as an endophyte without eliciting host-defence responses. The structures of many...

journal_title：Trends in microbiology

authors： Kannenberg EL,Brewin NJ

更新日期：1994-08-01 00:00:00

abstract：:Knockout mice with distinct gene deletions are valuable tools for in vivo analyses of the immune response against infectious agents. Studies of bacterial and protozoal infections have shown that antimicrobial immunity is generally defective in knockout mice. At one extreme, deletion of just one gene may completely com...

journal_title：Trends in microbiology

authors： Kaufmann SH,Ladel CH

更新日期：1994-07-01 00:00:00

abstract：:The ability of bacterial cells to use small signalling molecules to monitor population growth may help them to react rapidly to environmental change. Regulatory systems made up of a small sensor molecule, an N-acyl homoserine lactone and a protein effector have been identified recently in a wide range of Gram-negative...

journal_title：Trends in microbiology

authors： Swift S,Bainton NJ,Winson MK

更新日期：1994-06-01 00:00:00

abstract：:No curative drug against HIV has yet been found, despite enormous efforts aimed at reverse transcriptase and a variety of other targets. The long terminal repeat (LTR) of HIV-1 has recently become a promising site for antiviral action. This article briefly summarizes information on the nature of this target and potent...

journal_title：Trends in microbiology

authors： Li CJ,Dezube BJ,Biswas DK,Ahlers CM,Pardee AB

更新日期：1994-05-01 00:00:00

abstract：:Heat-stable enterotoxin, produced by Escherichia coli, binds to particulate guanylate cyclase to increase cyclic GMP in intestinal cells. This in turn stimulates the cyclic-GMP- or cyclic-AMP-dependent protein kinase, activating the same chloride channel that is defective in cystic fibrosis. It is possible that the re...

journal_title：Trends in microbiology

authors： Guggino SE

更新日期：1994-03-01 00:00:00

abstract：:Badgers represent a wildlife reservoir for bovine tuberculosis in Britain, which persists in the south west despite almost 20 years of badger control. The influence of landscape structure on patterns of badger urinatory behaviour may be one reason for the localized persistence of the disease in cattle within the regio...

journal_title：Trends in microbiology

authors： Brown JA,Harris S,White PC

更新日期：1994-02-01 00:00:00

abstract：:Pathogenic Yersinia express a number of strictly regulated, plasmid-encoded virulence determinants (Yops), some of which are important in enabling the pathogen to block phagocytosis. The events mediating antiphagocytosis and the regulation of this process are becoming increasingly well understood. ...

journal_title：Trends in microbiology

authors： Forsberg A,Rosqvist R,Wolf-Watz H

更新日期：1994-01-01 00:00:00

abstract：:Because the structure of the tobacco mosaic virus capsid protein is known, mutations that alter the phenotype of the virus-plant interaction can be correlated with structural changes in this protein. These mutations affect the disease symptoms caused by the virus and recognition of the virus by a plant resistance gene...

journal_title：Trends in microbiology

authors： Chapman S,Lindbeck AG,Dawson WO

更新日期：1993-10-01 00:00:00

abstract：:Despite the lack of an in vitro replication system, genes coding for viral proteins of hepatitis C virus have been identified. The putative nucleocapsid (p22) and envelope (gp35 and gp58) proteins have been expressed in cells by different vectors under various foreign promoters. Detection of antibodies to these protei...

journal_title：Trends in microbiology

authors： Miyamura T,Matsuura Y

更新日期：1993-09-01 00:00:00

abstract：:Pathogenic Yersinia express a complex array of iron-regulated functions and possess mechanisms for inorganic iron and hemin acquisition. These include a unique temperature-regulated hemin storage system, high-affinity transport processes for hemin and inorganic iron, and an iron-responsive regulatory system controllin...

journal_title：Trends in microbiology

authors： Perry RD

更新日期：1993-07-01 00:00:00