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Current Issues in Molecular Biology is published by MDPI from Volume 43 Issue 1 (2021). Previous articles were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence, and they are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Caister Press.

Curr. Issues Mol. Biol., Volume 2, Issue 3 (July 2000) – 3 articles

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Review
Formation of Protease-Resistant Prion Protein in Cell-Free Systems
by Byron Caughey
Curr. Issues Mol. Biol. 2000, 2(3), 95-101; https://doi.org/10.21775/cimb.002.095 - 01 Jul 2000
Viewed by 341
Abstract
In transmissible spongiform encephalopathies (TSE) or prion diseases, the endogenous protease-sensitive prion protein (PrP-sen) of the host is converted to an abnormal pathogenic form that has a characteristic partial protease resistance (PrP-res). Studies with cell-free reactions indicate that the PrP-res itself can directly [...] Read more.
In transmissible spongiform encephalopathies (TSE) or prion diseases, the endogenous protease-sensitive prion protein (PrP-sen) of the host is converted to an abnormal pathogenic form that has a characteristic partial protease resistance (PrP-res). Studies with cell-free reactions indicate that the PrP-res itself can directly induce this conversion of PrP-sen. This PrP-res induced conversion reaction is highly specific in ways that might account at the molecular level for TSE species barriers, polymorphism barriers, and strains. Not only has this reaction been observed using mostly purified PrP-sen and PrP-res reactants, but also in TSE-infected brain slices. The conversion mechanism appears to involve both the binding of PrP-sen to polymeric PrP-res and a conformational change that results in incorporation into the PrP-res polymer. Full article
1388 KiB  
Review
Expressing Active Ribozymes in Cells
by Dmitry Samarsky, Gerardo Ferbeyre and Edouard Bertrand
Curr. Issues Mol. Biol. 2000, 2(3), 87-93; https://doi.org/10.21775/cimb.002.087 - 01 Jul 2000
Viewed by 342
Abstract
Artificially engineered ribozymes can be used to specifically regulate expression of target genes. Such ribozymes can be synthesized chemically and delivered into the cell exogeneously. Alternatively, ribozymes can be produced by the cell endogenously, after introduction of the artificial gene into the cellular [...] Read more.
Artificially engineered ribozymes can be used to specifically regulate expression of target genes. Such ribozymes can be synthesized chemically and delivered into the cell exogeneously. Alternatively, ribozymes can be produced by the cell endogenously, after introduction of the artificial gene into the cellular genome. In the latter case, the design of the artificial gene defines the ribozyme properties, such as: expression level, intracellular localization, folding and association with proteins. Generally speaking, design of the expression vector is critical to obtain active ribozyme molecules. This paper first describes factors that are known or predicted to affect ribozyme activity in the cell, then reviews various expression systems that have been specifically developed for ribozymes. Lastly, a recently developed ribozyme system termed snorbozymes (small nucleolar RNA:ribozyme hybrids) will be discussed. This powerful test system has generated several important observations that are likely to affect the future development of ribozyme technology. Full article
659 KiB  
Review
Introductory Experiments in Recombinant DNA
by Robert C. Tait
Curr. Issues Mol. Biol. 2000, 2(3), 71-85; https://doi.org/10.21775/cimb.002.071 - 01 Jul 2000
Viewed by 624
Abstract
Nine practical exercises demonstrate the basic principles in recombinant DNA. The exercises explain the principles that DNA equals genes and that changes in DNA cause changes in genetic properties. The aim is to provide a teaching resource that can be used to illustrate [...] Read more.
Nine practical exercises demonstrate the basic principles in recombinant DNA. The exercises explain the principles that DNA equals genes and that changes in DNA cause changes in genetic properties. The aim is to provide a teaching resource that can be used to illustrate the theory and applications of molecular biology to highschool students, undergraduate students, medics, dentists, doctors, nurses, life scientists, and anyone learning the basics of DNA technology. Full article
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