title: The Aa-Pri4 gene, specifically expressed during fruiting initiation in the Agrocybe aegerita complex, contains an unusual CT-rich leader intron within the 5' uncoding region.
abstract: The Aa1-Pri4 gene was cloned from the edible mushroom Agrocybe aegerita. The gene, specifically expressed during fruiting initiation, encodes a glycine-rich protein of 116 amino acids, with no homology to already known proteins. Homologous genes were amplified from two other strains belonging to the Agr. aegerita complex and originating from South-East Asia; and a comparison of the three genes revealed a high conservation of the coding sequences (72.8-97.8%). The PRI4 putative protein sequences were highly similar (87.5-100.0%); and all of them contained two protein kinase C sites, suggesting a potential supplementary regulation by phosphorylation at the protein level. The 5' uncoding regions all presented a leader intron, very variable in sequence (45.7% identity), but with a high C+T content (74.5-79.0%). The presence of such CT-rich sequences previously described in the promoter of highly expressed fungal genes suggests that the leader intron of the Aa1-Pri4 gene could be involved in the high-level, stage-specific expression.
mesh_terms: D000363:Agaricales / Q000235:genetics*; D000595:Amino Acid Sequence; D001482:Base Composition; D001483:Base Sequence; D015152:Blotting, Northern; D017931:DNA Primers; D005602:France; D005656:Fungal Proteins / Q000235:genetics*; D040461:Gene Components; D020869:Gene Expression Profiling; D007438:Introns / Q000235:genetics*; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D012098:Reproduction / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D017385:Sequence Homology
chemical_list: D017931:DNA Primers; D005656:Fungal Proteins