Résumé
Most plants can form a symbiosis in root with microorganisms for mutual benefit, Nonlegumes mainly form the symbiotic mycorrhiza with arbuscular fungi. The interaction is initiated by invasion of arbuscular mycorrhizal (AM) fungi into the plant root, and follows by production of several special signal molecules, such as the symbiosis receptor-like kinase (SYMRK) from plant. SYMRK has an extracellular domain comprising three leucine-rich repeats (LRRs), a transmembrane domain and an cytoplasmic protein kinase domain. Symrk is required for a symbiotic signal transduction pathway from the perception of microbial signal molecules to the rapid symbiosis-related gene activation. Study of symrk may set up a solid foundation for giving further insight on the function and mechanism of plant-fungi symbiosis.
Sujets)
Séquence d'acides aminés , Interactions hôte-pathogène , Solanum lycopersicum , Données de séquences moléculaires , Mycorhizes , Physiologie , Phosphotransferases , Classification , Génétique , Phylogenèse , Protéines végétales , Classification , Génétique , Racines de plante , Génétique , Microbiologie , Similitude de séquences d'acides aminés , Transduction du signal , Génétique , Symbiose , GénétiqueRésumé
The Cre recombinase from bacteriophage P1 can recognize specific DNA sequences, cleave DNA at specific target sites, and then ligate it to the cleaved DNA of a second site. In this study, cre gene was cloned into the pGEM-T Easy vector via PCR procedure. Then the cre gene was inserted into an expression vector pET-29a and expressed in E. coli BL21 (DE3). A 38 kD soluble protein was expressed and named CRE. CRE was purified by DEAE-52 chromatography. Bioassay of the partially purified product showed that CRE can cleave the plasmid pGLGFP which contains two loxP site with the same direction.
Sujets)
Chromatographie sur DEAE-cellulose , Escherichia coli , Génétique , Régulation de l'expression des gènes codant pour des enzymes , Protéines à fluorescence verte , Integrases , Génétique , Métabolisme , Protéines luminescentes , Génétique , Métabolisme , Plasmides , Génétique , Protéines recombinantes , Métabolisme , Protéines virales , Génétique , MétabolismeRésumé
The Cre recombinase, an integrase from bacteriophage P1, catalyzes site-specific recombination between 34-bp repeats termed loxP sites, in the absence of any additional cofactors and energy. Mediated by Cre recombinase, specific DNA fragments can be excised, inversed or integrated depending on the orientation or position of loxP sites in vitro or in vivo. Because of its simplicity and high efficiency, Cre/loxP site-specific recombination system has been widely used in gene deletion and function identification, gene site-specific integration, gene trapping and chromosome engineering. It has been used as a useful tool for DNA recombination in transgenic yeast, plants, insects and mammals. Here progress in the study of the structure and function of Cre recombinase is discussed.