Cloning and sequence analysis of the Mucor circinelloides pyrG gene encoding orotidine-5'-monophosphate decarboxylase: use of pyrG for homologous transformation. 1992

E P Benito, and J M Díaz-Mínguez, and E A Iturriaga, and V Campuzano, and A P Eslava
Departamento de Microbiología y Genética, Facultad de Biología, Universidad de Salamanca, Spain.

A 3.2-kb BamHI genomic DNA fragment containing the pyrG gene of Mucor circinelloides was isolated by heterologous hybridization using a pyrG cDNA clone of Phycomyces blakesleeanus as the probe. The complete nucleotide sequence of the M. circinelloides pyrG gene encoding orotidine-5'-monophosphate decarboxylase (OMPD) was determined and the transcription start points (tsp) were mapped by primer extension analysis. The predicted amino acid sequence showed homology with the OMPD sequences reported from other filamentous fungi, with 96% similarity with the OMPD of P. blakesleeanus. Analysis of the sequence revealed the presence of two short introns whose length and location were confirmed by sequencing a cDNA clone and comparing this with its genomic counterpart. The intron splice sites and the 5'- and 3'-noncoding flanking regions show general features of fungal genes. Northern-blot hybridization revealed the pyrG transcript to be approx. 1.0 kb. The M. circinelloides pyrG cDNA clone was able to complement the pyrF::Mu-1 mutation of Escherichia coli when inserted between bacterial expression signals. Additionally, the genomic clone complemented the M. circinelloides pyrG4 mutation. When an M. circinelloides autonomous replication sequence was included in the transforming plasmid, the average transformation frequency obtained was 600 to 800 transformants per micrograms DNA and per 10(6) viable protoplasts.

UI MeSH Term Description Entries
D007438 Introns Sequences of DNA in the genes that are located between the EXONS. They are transcribed along with the exons but are removed from the primary gene transcript by RNA SPLICING to leave mature RNA. Some introns code for separate genes. Intervening Sequences,Sequences, Intervening,Intervening Sequence,Intron,Sequence, Intervening
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
D009089 Mucor A genus of zygomycetous fungi of the family Mucoraceae, order Mucorales. It is primarily saprophytic, but may cause MUCORMYCOSIS in man from spores germinating in the lungs. Mucors
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
D009964 Orotidine-5'-Phosphate Decarboxylase Orotidine-5'-phosphate carboxy-lyase. Catalyzes the decarboxylation of orotidylic acid to yield uridylic acid in the final step of the pyrimidine nucleotide biosynthesis pathway. EC 4.1.1.23. Orotidine Phosphate Carboxy-Lyase,Orotidylate Decarboxylase,OMP Decarboxylase,Orotidine 5 Phosphate Decarboxylase,Orotidine 5' Phosphate Decarboxylase,Orotidine-5-Phosphate Decarboxylase,Carboxy-Lyase, Orotidine Phosphate,Decarboxylase, OMP,Decarboxylase, Orotidine-5'-Phosphate,Decarboxylase, Orotidine-5-Phosphate,Decarboxylase, Orotidylate,Orotidine Phosphate Carboxy Lyase,Phosphate Carboxy-Lyase, Orotidine
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
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
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA

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