Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.2.1.23 (beta-galactosidase)
 14,648 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The yeast cell division cycle gene CDC6 was isolated by complementation of a temperature-sensitive cdc6 mutant with a genomic library. The amino acid sequence of the 48 kDalton CDC6 gene product, as deduced from DNA sequence data, includes the three consensus peptide motifs involved in guanine nucleotide binding and GTPase activity, a target site for cAMP-dependent protein kinase and a carboxy-terminal domain related to metallothionein sequences. A plasmid-encoded CDC6-beta-galactosidase hybrid protein was located at the plasma membrane by indirect immunofluorescence. Disruption experiments indicate that the CDC6 gene product is essential for mitotic growth.
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PMID:Cloning and characterization of the Saccharomyces cerevisiae CDC6 gene. 306 76

Using beta-galactosidase as the reporter gene, we carried out mutagenesis experiments to investigate the 5' promoter region of the CDC6 gene. Our results showed that the DNA element, between -262 and -170, is important for the upstream activating sequence (UAS) activities. On the basis of the DNA sequence, there is a Mlu I (-204) and a Mlu I-like (-216) element located within the middle of the UAS region. Insertion and deletion mutagenesis analysis of the Mlu I sequence has indicated that the internal CGCG sequence of the Mlu I site (ACGCGT) is important for gene expression. Furthermore, when DNA elements containing the Mlu I sites were subcloned into the tester plasmid, periodic expression of a reporter gene throughout the cell cycle was observed, as evidenced by the beta-galactosidase activities and lacZ mRNA. Because the possible transcriptional initiation sites of the CDC6 transcript have been previously defined (Zhou and Jong, 1990, J. Biol. Chem. 264, 9022-9029), we propose a model regarding the construct of the CDC6 promoter region. This 5' promoter construct contains a UAS region and a Mlu I element (MCB box) typical of a family of cell cycle-regulated genes involved in DNA metabolism. Previous genetic studies have not completely defined the CDC6 execution point in the functional yeast cell cycle map. Our results favor the possibility that the CDC6 gene is required, and directly involved, in the initiation of DNA replication.
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PMID:Mutation analysis of Saccharomyces cerevisiae CDC6 promoter: defining its UAS domain and cell cycle regulating element. 849 12

CDC6 is an essential gene of yeast Saccharomyces cerevisiae. Although DNA sequence of the gene is available for a long time, biochemical function of Cdc6 protein in the cell cycle remains unclear. Using the interaction trap experiment we were looking for proteins interacting specifically with Cdc6. Four gene products interacting with Cdc6 were detected. By sequence analysis we found that ECM11 codes for the protein involved in the cell wall synthesis, YNL201 codes for the protein of unknown function, probably involved in the carbon metabolism, YOR279 codes for protein of completely unknown function with no significant similarity with any known protein, and the interaction with Ty1 retrotransposition element was also found. The strongest interaction with Cdc6 bait measured as beta-galactosidase activity was observed with ECM11 and YNL201; YOR279 interacts slightly weaker. The weakest beta-galactosidase activity was obtained by Ty1A element. The strongest suppression of cdc6-1 mutation was observed by Ty1A element, the slight one with ECM11 and YNL201 but no suppression of thermosensitive mutation was detected for YOR279.
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PMID:Interaction trap experiment with CDC6. 1065 53