摘要:
Phototropin is a blue light receptor, which mediates a variety of blue-light elicited physiological processes in plants and algae. In higher plants these processes include phototropism, chloroplast movement and stomatal opening. In the green alga Chlamydomonas reinhardtii , phototropin plays a vital role in progression of the sexual life cycle and In the control of the eye spot size and light sensitivity Phototropin is also involved in blue-light mediated changes in the synthesis of chlorophylls, carotenoids, chlorophyll binding proteins. We compared the transcriptome of phototropin knock out (PHOT KO) mutant and wild-type parent to analyze differences in gene expression in high light grown cultures (500 μmol photons m -2 s -1 ). Our results indicate the up-regulation of genes involved in photosynthetic electron transport chain, carbon fixation pathway, starch, lipid, and cell cycle control genes. With respect to photosynthetic electron transport genes, genes encoding proteins of the cytochrome b6f and ATP synthase complex were up regulated potentially facilitating proton-coupled electron transfer. In addition genes involved in limiting steps in the Calvin cycle Ribulose-1,5-blsphosphate carboxylase/oxygenase (RuBisCO), Sidoheptulose 1,7 bisphosphatase (SBPase), Glyceraldehyde-3- phosphate dehydrogenase (3PGDH) and that mediate cell-cycle control (CDK) were also up regulated along with starch synthase and fatty acid biosynthesis genes involved in starch and lipid synthesis, in addition, transmission electron micrographs show increased accumulation of starch granules in PHOT mutant compared to wild type, which is consistent with the higher expression of starch synthase genes. Collectively, the altered patterns of gene expression in the PHOT mutants were associated with a two-fold increase in growth and biomass accumulation compared to wild type when grown in environmental photobioreactors (Phenometrics) that simulate a pond environment. In conclusion, our studies suggest that phototropin may be a master gene regulator that suppresses rapid cell growth and promotes gametogenesis and sexual recombination in wild type strains.
摘要:
Methods and devices useful for reprogramming microbial cells to grow under different culture conditions are provided. The methods and devices can be used to prepare cultures of new, previously uncharacterized microbial species and for identifying laboratory conditions to culture, propagate, and study microbes that do not grow under standard laboratory conditions. The invention is also useful for characterizing microbiota, such as the communities of microorganisms inhabiting the human body and natural environments such as soil.
摘要:
The present invention generally relates to the microbiological industry, and specifically to the production of L-serine using genetically modified bacteria. The present invention provides genetically modified microorganisms, such as bacteria, wherein the expression of genes encoding for enzymes involved in the degradation of L-serine is attenuated, such as by inactivation, which makes them particularly suitable for the production of L-serine at higher yield. The present invention also provides means by which the microorganism, and more particularly a bacterium, can be made tolerant towards higher concentrations of serine. The present invention also provides methods for the production of L-serine or L-serine derivative using such genetically modified microorganisms.
摘要:
The invention relates to yeast cells with useful characteristics, including being capable of utilizing panose as sole carbon source and/or capable of utilizing one or more dipeptidesas sole nitrogen source. The invention also relates to yeast cells with useful genotypes including comprising at least 4 allelic genes encoding IMA1p and/or at least two allelic genes encoding IMA5p.
摘要:
Manipulation of male fertility in a polyploid species requires attention to the interaction of male-fertility alleles of multiple genomes. In hexaploid wheat, single-genome heterozygotes for Ms26 provide differential levels of male fertility across genomes. Hexaploid wheat homozygous for mutations in the Ms26 gene on the A, B, and D genomes is male-sterile. Male fertility may be restored by sufficient levels of expression of Ms26 using native Ms26 or a transgene, which may be native to wheat or to another species, or a combination of native and transgenic alleles. CRISPR/Cas9 technology may be used to generate mutations in Ms26 in wheat or rice.
摘要:
The invention relates generally to a method of improving solvent tolerance in microbes, and in particular, to a method of improving bio-butanol titre in a fermentation process due to improved solvent tolerance in microbes. The method of improving butanol titre in a fermentation process involves the addition of a membrane insertion molecule comprising a conjugated oligoelectrolyte, particularly an oligo-polyphenylene vinylene conjugated oligoelectrolyte.
摘要:
Methods and constructs for RNA-guided targeting of heterologous functional domains such as transcriptional activators to specific genomic loci. This invention relates to methods and constructs for RNA-guided targeting of genetic and epigenomic regulatory proteins, e.g., transcriptional activators, histone modification enzymes, DNA methylation modifiers, to specific genomic loci. At least in part, the present invention is based on the development of a fusion protein including a heterologous functional domain (e.g., a transcriptional activation domain) fused to a Cas9 nuclease that has had its nuclease activity inactivated by mutations (also known as "dCas9").
摘要:
Strategies, systems, methods, reagents, and kits for phage-assisted continuous evolution are provided herein. These include strategies, systems, methods, reagents, and kits allowing for stringency modulation to evolve weakly active or inactive biomolecule variants, negative selection of undesired properties, and/or positive selection of desired properties.