title: Cloning and disruption of the PpURA5 gene and construction of a set of integration vectors for the stable genetic modification of Pichia pastoris.
abstract: A pair of degenerate primers was used for amplification and cloning of a DNA fragment containing parts of the P. pastoris URA5 and SEC65 genes. Using additional information from a partial genomic sequence of P. pastoris, we cloned and sequenced a 1.9 kb chromosomal fragment containing the complete orotate-phosphoribosyltransferase-encoding URA5 gene. A disruption cassette was constructed by replacing a small part of the open reading frame with a kanamycin-resistance gene. The P. pastoris wild-type strain NRRL Y-11430 was transformed with the disruption cassette and an ura5 auxotrophic strain was identified. To generate marker constructs that can be reused in successive transformations of a single strain, we constructed two lacZ-PpURA3-lacZ and lacZ-PpURA5-lacZ cassettes and used them to disrupt PpOCH1. The PpURA3 and PpURA5 genes in the disruptants were then successfully recycled by selecting for resistance to 5'-fluoro-orotic acid. We also assembled a set of modular plasmids that can be used for the stable genetic modification of P. pastoris via a double cross-over event. The sequence presented here has been submitted to the EMBL data library under Accession No. AY303544.
authors: GlycoFi Inc 21 Lafayette St., Suite 200, Lebanon, NH, USA.
authors: Juergen H
authors: JH
authors: Nett
authors: Tillman U
authors: TU
authors: Gerngross
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D025141:Drug Resistance, Fungal / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics; D005822:Genetic Vectors; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009962:Orotate Phosphoribosyltransferase / Q000235:genetics*; D009963:Orotic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D010843:Pichia / Q000201:enzymology* / Q000235:genetics*; D010957:Plasmids; D016133:Polymerase Chain Reaction; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D014170:Transformation, Genetic / Q000235:genetics
chemical_list: D004271:DNA, Fungal; D005656:Fungal Proteins; D009963:Orotic Acid; C001242:5-fluoroorotic acid; D009962:Orotate Phosphoribosyltransferase