Biomaterial Database

Cloning, nucleotide sequence and regulation of the Salmonella typhimurium pyrD gene encoding dihydroorotate dehydrogenase. 1990

M M Frick, and J Neuhard, and R A Kelln

Department of Chemistry, University of Regina, Canada.

The Salmonella typhimurium pyrD gene encoding dihydroorotate dehydrogenase was cloned and sequenced. In total, a sequence of 1286 nucleotide pairs was determined wherein a single open-reading-frame of 1011 bp, encoding a polypeptide of 336 amino acids having 95% similarity with the Escherichia coli pyrD gene product, was identified. A region of hyphenated-dyad symmetry exists within the leader region affording the potential for the formation of a stable secondary structure in the 5' end of the transcript. Mutations from several regulatory mutants were located within the region of dyad symmetry which would impart changes in the transcript within the putative secondary structure, implicating the secondary structure in regulation. Primer extension analysis revealed multiple transcriptional start sites located six to nine nucleotides downstream from the Pribnow box, with the primary initiation site differing in repressing and derepressing growth conditions. The results are discussed in terms of a translational attenuation model for regulation of pyrD expression.

UI	MeSH Term	Description	Entries
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
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
D010088	Oxidoreductases	The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where O2 is the acceptor. (Enzyme Nomenclature, 1992, p9)	Dehydrogenases,Oxidases,Oxidoreductase,Reductases,Dehydrogenase,Oxidase,Reductase
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
D004269	DNA, Bacterial	Deoxyribonucleic acid that makes up the genetic material of bacteria.	Bacterial DNA
D005798	Genes, Bacterial	The functional hereditary units of BACTERIA.	Bacterial Gene,Bacterial Genes,Gene, Bacterial
D005814	Genes, Viral	The functional hereditary units of VIRUSES.	Viral Genes,Gene, Viral,Viral Gene
D000090722	Dihydroorotate Dehydrogenase	An oxidoreductase that catalyzes the conversion of DIHYDROOROTATE to orotate with QUINONE as an electron acceptor in the biosynthesis of PYRIMIDINES.	DHODH,DHOO-Dehydrogenase-U,Dihydro-Orotate Dehydrogenase,Dihydro-Orotate-Cytochrome C Reductase,Dihydroorotate Dehydrogenase (Ubiquinone),Dihydroorotate Dehydrogenase Type A,Dihydroorotate Dehydrogenase Type B,Dihydroorotate Dehydrogenase Type C,Dihydroorotate-Ubiquinone Oxidoreductase,DHODase A,DHODase B,A, DHODase,B, DHODase,C Reductase, Dihydro-Orotate-Cytochrome,DHOO Dehydrogenase U,Dehydrogenase, Dihydro-Orotate,Dehydrogenase, Dihydroorotate,Dihydro Orotate Cytochrome C Reductase,Oxidoreductase, Dihydroorotate-Ubiquinone,Reductase, Dihydro-Orotate-Cytochrome C
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