Biomaterial Database

Identification of a novel gene hbrB required for polarised growth in Aspergillus nidulans. 2004

I M Gatherar, and S Pollerman, and N Dunn-Coleman, and G Turner

Department Molecular Biology and Biotechnology, The University of Sheffield, Western Bank, Sheffield, England, S10 2TN, UK.

We have cloned a novel gene, hbrB, by complementation of a temperature sensitive hyperbranching (hbr) mutant of Aspergillus nidulans. The mutant, hbrB3, exhibits hyperseptation and shows a marked increase in hyphal branching at the restrictive temperature. A genomic library incorporating the AMA1 sequence, which confers autonomous replication on the plasmid, was used to clone the gene. Co-ordinate loss of the complementing plasmid and wild type phenotype was shown. The 847 amino acid predicted product of the hbrB gene shows significant identities with Neurospora crassa and Aspergillus fumigatus hypothetical proteins but no other obvious relative outside the filamentous fungi. The gene was placed under control of the alcA promoter and downregulation resulted in a loss of polarity phenotype. These results suggest that A. nidulans hbrB is specific to filamentous fungi and is essential for hyphal growth and polarity. Index descriptors: Aspergillus nidulans; branching; hbrB; hyphal growth and polarity

UI	MeSH Term	Description	Entries
D008969	Molecular Sequence Data	Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.	Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009154	Mutation	Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.	Mutations
D009492	Neurospora crassa	A species of ascomycetous fungi of the family Sordariaceae, order SORDARIALES, much used in biochemical, genetic, and physiologic studies.	Chrysonilia crassa
D010957	Plasmids	Extrachromosomal, usually CIRCULAR DNA molecules that are self-replicating and transferable from one organism to another. They are found in a variety of bacterial, archaeal, fungal, algal, and plant species. They are used in GENETIC ENGINEERING as CLONING VECTORS.	Episomes,Episome,Plasmid
D003001	Cloning, Molecular	The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells.	Molecular Cloning
D004271	DNA, Fungal	Deoxyribonucleic acid that makes up the genetic material of fungi.	Fungal DNA
D005656	Fungal Proteins	Proteins found in any species of fungus.	Fungal Gene Products,Fungal Gene Proteins,Fungal Peptides,Gene Products, Fungal,Yeast Proteins,Gene Proteins, Fungal,Peptides, Fungal,Proteins, Fungal
D005800	Genes, Fungal	The functional hereditary units of FUNGI.	Fungal Genes,Fungal Gene,Gene, Fungal
D005816	Genetic Complementation Test	A test used to determine whether or not complementation (compensation in the form of dominance) will occur in a cell with a given mutant phenotype when another mutant genome, encoding the same mutant phenotype, is introduced into that cell.	Allelism Test,Cis Test,Cis-Trans Test,Complementation Test,Trans Test,Allelism Tests,Cis Tests,Cis Trans Test,Cis-Trans Tests,Complementation Test, Genetic,Complementation Tests,Complementation Tests, Genetic,Genetic Complementation Tests,Trans Tests
D001232	Aspergillus fumigatus	A species of imperfect fungi from which the antibiotic fumigatin is obtained. Its spores may cause respiratory infection in birds and mammals.	Aspergillus fumigates,Neosartorya fumigata,Sartorya fumigata