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Cloning and sequencing of the genes encoding glyceraldehyde-3-phosphate dehydrogenase, phosphoglycerate kinase and triosephosphate isomerase (gap operon) from mesophilic Bacillus megaterium: comparison with corresponding sequences from thermophilic Bacillus stearothermophilus. 1992

B S Schläpfer, and H Zuber
Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule, Zürich, Switzerland.

The structural genes encoding glyceraldehyde-3-phosphate dehydrogenase (GAPDH), 3-phosphoglycerate kinase (PGK) and the N-terminal part of triosephosphate isomerase (TIM) from mesophilic Bacillus megaterium DSM319 have been cloned as a gene cluster (gap operon) by complementation of an Escherichia coli gap amber mutant. Subsequently, the entire tpi gene, encoding TIM, was isolated by colony hybridization using a homologous probe. Nucleotide (nt) sequence analysis revealed an unidentified open reading frame (urf1) of 1029 bp located 50 nt upstream from the start codon of the gap gene. Gene expression from subclones containing different coding regions was studied by enzyme assay and SDS-PAGE. Both GAPDH and TIM are synthesized in transformed E. coli cells, whereas PGK is not. There is no unequivocal evidence for urf1 expression. Two putative promoter sites are present: one 100 nt upstream from urf1 and one 200 nt upstream from the pgk gene. An inverted repeat following the second promoter site is postulated to be involved in the transcriptional regulation of the operon. Each coding region shows a G+C content of 40% attained by the adaptation of the G+C content of the third base in the codon to compensate the G+C content of the first and second bases. The deduced amino acid (aa) sequences of B. megaterium GAPDH, PGK and TIM were compared with those from the thermophilic Bacillus stearothermophilus by antisymmetrical matrices. The detected characteristic thermophilic-mesophilic exchange pattern concerning aa substitutions between hydrophobic-polar and charged-charged residues corresponds to data obtained for thermophilic and mesophilic lactate dehydrogenases (LDH). The determination of the thermostability of these enzymes revealed two regions of stability for B. megaterium TIM at high enzyme concentrations. Heat treatment seems to be responsible for the conversion of two differently active conformations or the induction of a new quaternary structure.

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
D009876 Operon In bacteria, a group of metabolically related genes, with a common promoter, whose transcription into a single polycistronic MESSENGER RNA is under the control of an OPERATOR REGION. Operons
D010735 Phosphoglycerate Kinase An enzyme catalyzing the transfer of a phosphate group from 3-phospho-D-glycerate in the presence of ATP to yield 3-phospho-D-glyceroyl phosphate and ADP. EC 2.7.2.3. Kinase, Phosphoglycerate
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
D004591 Electrophoresis, Polyacrylamide Gel Electrophoresis in which a polyacrylamide gel is used as the diffusion medium. Polyacrylamide Gel Electrophoresis,SDS-PAGE,Sodium Dodecyl Sulfate-PAGE,Gel Electrophoresis, Polyacrylamide,SDS PAGE,Sodium Dodecyl Sulfate PAGE,Sodium Dodecyl Sulfate-PAGEs
D004795 Enzyme Stability The extent to which an enzyme retains its structural conformation or its activity when subjected to storage, isolation, and purification or various other physical or chemical manipulations, including proteolytic enzymes and heat. Enzyme Stabilities,Stabilities, Enzyme,Stability, Enzyme
D005091 Exons The parts of a transcript of a split GENE remaining after the INTRONS are removed. They are spliced together to become a MESSENGER RNA or other functional RNA. Mini-Exon,Exon,Mini Exon,Mini-Exons
D005987 Glyceraldehyde-3-Phosphate Dehydrogenases Enzymes that catalyze the dehydrogenation of GLYCERALDEHYDE 3-PHOSPHATE. Several types of glyceraldehyde-3-phosphate-dehydrogenase exist including phosphorylating and non-phosphorylating varieties and ones that transfer hydrogen to NADP and ones that transfer hydrogen to NAD. GAPD,Glyceraldehyde-3-Phosphate Dehydrogenase,Glyceraldehydephosphate Dehydrogenase,Phosphoglyceraldehyde Dehydrogenase,Triosephosphate Dehydrogenase,Dehydrogenase, Glyceraldehyde-3-Phosphate,Dehydrogenase, Glyceraldehydephosphate,Dehydrogenase, Phosphoglyceraldehyde,Dehydrogenase, Triosephosphate,Dehydrogenases, Glyceraldehyde-3-Phosphate,Glyceraldehyde 3 Phosphate Dehydrogenase

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