title: The B regulatory subunit of protein phosphatase 2A is required for completion of macroconidiation and other developmental processes in Neurospora crassa.
abstract: rgb-1, encoding the tentative B regulatory subunit of the type 2A Ser/Thr phosphatase in Neurospora crassa, was isolated from cDNA and genomic libraries. Based on analysis of cDNA and genomic clones, rgb-1 is 3387 nucleotides in length, contains seven putative introns and encodes a 461-amino-acid polypeptide. Intron I, which is 5' to the presumed translation initiation codon, contains a uORF encoding 34 amino acids. Intron VI undergoes alternative splicing. Inactivation of rgb-1 by the repeat-induced point (RIP) mutation procedure produced progeny that grow slowly, have abnormal hyphal morphology, are female sterile and produce abundant amounts of arthroconidia. The rgb-1RIP strain does not produce major constriction chains or mature macroconidia. Minor constriction chains are formed, yet the growth process reverts to hyphal elongation. Microscopic and genetic analyses indicate that rgb-1 is a regulator of the budding subroutine of the macroconidiation process and that arthroconidiation, which shares common early and late events with macroconidiation, is induced as a default mechanism for asexual reproduction in this fungus.
authors.affiliation: Department of Plant Pathology and Microbiology, Faculty of Agricultural Food and Environmental Quality Sciences, Hebrew University of Jerusalem, Rehovot, Israel.
authors.forename: E
authors.initials: E
authors.lastname: Yatzkan
authors.forename: O
authors.initials: O
authors.lastname: Yarden
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004271:DNA, Fungal; D005656:Fungal Proteins; D015966:Gene Expression Regulation, Fungal; D008969:Molecular Sequence Data; D009492:Neurospora crassa / Q000201:enzymology* / Q000235:genetics / Q000502:physiology / Q000648:ultrastructure; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000502:physiology*; D054648:Protein Phosphatase 2; D017386:Sequence Homology, Amino Acid