The Aspergillus nidulans swoC1 mutant shows defects in growth and development.
Previous work identified swoC1 as a single-gene mutant with defects in polarity establishment. In this study swoC1 was shown to have defects in endocytosis, compartmentation, nuclear distribution, and conidiation. Temperature-shift experiments showed that the swoC1 mutant establishes multiple random sites of germ tube emergence. Surprisingly, these experiments also showed that even a slight delay in polarity establishment causes defects in later vegetative growth and asexual reproduction. The swoC gene was mapped to the centromere of chromosome III and cloned by complementation of the temperature-sensitive phenotype. The predicted SwoCp is homologous to rRNA pseudouridine synthases of yeast (Cbf5p) and humans (Dkc1p). However, neither rRNA pseudouridine synthesis nor rRNA processing appears to be affected in the swoC1 mutant. The swoC1 mutation occurs in the putative RNA-binding domain upstream of the C terminus, leaving the N-terminal TRUB catalytic domain intact. Interestingly, while deletion of the swoC gene was lethal in A. nidulans, the C terminus, including NLS, microtubule-binding, and coiled-coil domains, was dispensable for growth. SwoCp likely plays an important role in polar growth and nuclear distribution in A. nidulans, functions not yet described for its homologs.
Department of Plant Biology, University of Georgia, Athens, Georgia 30602, USA.
Xiaorong
X
Lin
Michelle
M
Momany
D000595:Amino Acid Sequence; D001233:Aspergillus nidulans / Q000235:genetics* / Q000254:growth & development; D016764:Cell Polarity / Q000235:genetics / Q000502:physiology; D002874:Chromosome Mapping; D004705:Endocytosis / Q000235:genetics / Q000502:physiology; D006836:Hydro-Lyases / Q000235:genetics / Q000378:metabolism; D008869:Microtubule-Associated Proteins / Q000235:genetics; D008938:Mitosis / Q000235:genetics / Q000502:physiology; D008969:Molecular Sequence Data; D009154:Mutation; D012323:RNA Processing, Post-Transcriptional / Q000502:physiology; D012335:RNA, Ribosomal / Q000096:biosynthesis; D016601:RNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D017411:Ribonucleoproteins, Small Nuclear / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics
D008869:Microtubule-Associated Proteins; D012335:RNA, Ribosomal; D016601:RNA-Binding Proteins; D017411:Ribonucleoproteins, Small Nuclear; D029701:Saccharomyces cerevisiae Proteins; D006836:Hydro-Lyases; C082278:CBF5 protein, S cerevisiae; C022479:pseudouridylate synthetase