We performed detailed phenotypic analysis of the isw2 delta strains of the W303 genetic background and compared its results with those obtained previously in BY-derived genetic background. Shmoolike morphology was observed in the isw2 delta strain of alpha-mating type of the BY strains, but not in its W303-derived counterpart. On the other hand, derepression of a-specific genes in the isw2 delta (MAT alpha) strain was observed in both genetic backgrounds, although to a different extent. Unlike in BY-derived strain hyperactivation of the Ras2/cAMP pathway reduced invasiveness of the isw2 delta strain (MAT alpha) of the W303 background. Sensitivity to Calcofluor White indicating a cell wall-integrity defect was significantly increased in the isw2 delta strains of the W303 background in contrast to BY-derived strains. Our data indicate that the effects of the isw2 deletion strongly depend on the background in which the deletion, is made.
- MeSH
- adenosintrifosfatasy genetika MeSH
- buněčná stěna MeSH
- delece genu MeSH
- fenotyp MeSH
- genotyp MeSH
- haploidie MeSH
- Saccharomyces cerevisiae - proteiny genetika MeSH
- Saccharomyces cerevisiae cytologie genetika MeSH
- transkripční faktory genetika MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- adenosintrifosfatasy MeSH
- ISWI protein MeSH Prohlížeč
- Saccharomyces cerevisiae - proteiny MeSH
- transkripční faktory MeSH
We have analyzed ARS elements linked to homologous and heterologous ADE2 loci functioning in Schwanniomyces occidentalis. We have identified a region of the ADE2 locus of S. occidentalis which promotes autonomous replication of plasmids in S. occidentalis cells. This region is within 385 bp preceding the ATG codon of the S. occidentalis ADE2 gene. It contains sequences similar to ARS core consensus sequences, ARS boxes, and a potential transcription activator binding site characterized in Saccharomyces cerevisiae. The ADE2 gene of S. cerevisiae was found to complement the ade2 mutation in S. occidentalis cells and the 5' UTR region of this gene is capable of supporting autonomous replication of plasmids in S. occidentalis. Furthermore, we confirmed that the origin of replication of the 2 microm plasmid and the ARS1 sequence of S. cerevisiae are also functional in S. occidentalis cells. Plasmids carrying either ARS, the SwARSA element of S. occidentalis, the ARS linked to the ADE2 gene of S. cerevisiae, and the ARS1 sequence or the 2 microm ori, were found to be maintained in S. occidentalis cells as episomal monomers or oligomers. However, their stability was low as already reported for the ARS in S. occidentalis.
- MeSH
- 5' nepřekládaná oblast MeSH
- karboxylyasy genetika MeSH
- molekulární sekvence - údaje MeSH
- plazmidy genetika MeSH
- regulace genové exprese u hub MeSH
- regulační oblasti nukleových kyselin * MeSH
- replikace DNA MeSH
- replikační počátek MeSH
- Saccharomyces cerevisiae genetika MeSH
- Saccharomycetales genetika MeSH
- sekvence nukleotidů MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- 5' nepřekládaná oblast MeSH
- karboxylyasy MeSH
- phosphoribosylaminoimidazole carboxylase MeSH Prohlížeč
A molecular genetic characterization of the ORF YOR304W (ISW2), identified in a screen of a yeast lambdagt11 library using a monoclonal antibody that reacts with a 210 kDa mammalian microtubule-interacting protein, is presented in this paper. The protein encoded by the ORF YOR304W is 50% identical to the Drosophila nucleosome remodelling factor ISWI and is therefore a new member of the SNF2 protein family and has been recently entered into SDG as ISW2. Although not essential for vegetative growth, we found that the ISW2 gene is required for early stages in sporulation. The isw2 homozygous deletant diploid strain was blocked in the G(1) phase of the cell cycle, unable to execute the premeiotic DNA replication and progress through the nuclear meiotic division cycle. ISW2 expression from a multicopy plasmid had the same effect as deletion, but ISW2 expression from a centromeric plasmid rescued the deletion phenotype. In vegetatively growing diploid cells, the Isw2 protein was preferentially found in the cytoplasm, co-localizing with microtubules. An accumulation of the Isw2 protein within the nucleus was observed in cells entering sporulation. Together with data published very recently by Tsukiyama et al. (1999), we propose a role for the Isw2 protein in facilitating chromatin accessibility for transcriptional factor(s) that positively regulate meiosis/sporulation-specific genes.
- MeSH
- fungální proteiny analýza MeSH
- geny hub fyziologie MeSH
- imunohistochemie MeSH
- mikrotubuly chemie MeSH
- molekulová hmotnost MeSH
- replikace DNA * MeSH
- Saccharomyces cerevisiae genetika MeSH
- spory hub fyziologie MeSH
- western blotting MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- fungální proteiny MeSH
Auxotrophic mutations in the methylotrophic yeast strain Candida boidinii 11Bh were induced by different mutagens and their combinations (nitrosoguanidine, UV light, HNO2+UV). Majority of the mutants obtained carried defects in histidine, arginine, proline and/or adenine biosynthetic pathways. His- mutants were distributed into four complementation groups using the protoplasts fusion technique. Ploidy determination of Candida boidinii 11Bh was performed by measuring its DNA content and by following its survival after chemical mutagens treatment. The DNA content of this strain was found to be similar to that of a Saccharomyces cerevisiae diploid strain. Also the kinetics of survival of Candida boidinii cells indicate that Candida boidinii 11Bh is a diploid.
- MeSH
- Candida genetika metabolismus MeSH
- diploidie * MeSH
- DNA fungální analýza MeSH
- geny hub * MeSH
- histidin biosyntéza genetika MeSH
- mutace MeSH
- testy genetické komplementace MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- DNA fungální MeSH
- histidin MeSH
Fragments of Candida boidinii chromosomal DNA were inserted into the integrative vector YIp-kanr and examined for the presence of sequences promoting autonomous replication of plasmids in Saccharomyces cerevisiae. Restriction maps of two plasmids, designated S6/4 and S6/5, originating from the same S. cerevisiae transformant, were constructed. Southern hybridization data confirmed that the plasmids carry sequences from the C. boidinii chromosome. Both plasmids transform S. cerevisiae strains at 4-5-fold higher frequency than cloning vectors based on the replication origin of the 2 microns plasmid. Mitotic stability of the constructed plasmids is similar to that of the 2 mu-based vector pNF2 in S. cerevisiae.
