title: Construction of a shuttle vector for the filamentous fungus Neurospora crassa.
abstract: We have constructed a recombinant plasmid, pALS-1, that replicates autonomously in both Neurospora and Escherichia coli. pALS-1 consists of the mitochondrial plasmid from Neurospora strain P405-Labelle, the Neurospora qa-2+ gene, and E. coli plasmid pBR325. pALS-1 transforms the Neurospora qa-2+ gene at frequencies 5- to 10-fold higher than those for plasmids that transform mainly by integration. When E. coli was transformed with DNA from Neurospora transformants, we recovered not only pALS-1 but also a smaller plasmid, pALS-2, which had undergone deletion of most and possibly all Labelle sequences, and the immediately flanking sequences in pBR325. pALS-2 also appears to replicate autonomously in Neurospora, but less efficiently than does pALS-1. Southern blots show that free pALS-1 and pALS-2 are present in nuclear and cytosolic (supernatant from high-speed centrifugation) fractions of Neurospora transformants and that small, variable proportions of the plasmids also can be detected in mitochondria. pALS-1 and pALS-2 constitute putative shuttle vectors for Neurospora.
mesh_terms: D004270:DNA, Circular / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics; D005822:Genetic Vectors; D009491:Neurospora / Q000235:genetics*; D009492:Neurospora crassa / Q000235:genetics*; D010957:Plasmids; D014170:Transformation, Genetic
chemical_list: D004270:DNA, Circular; D004272:DNA, Mitochondrial