The mitotic feedback control gene MAD2 encodes the alpha-subunit of a prenyltransferase.
The mad2-1 mutation inactivates the cell-cycle feedback control that prevents budding yeast cells from leaving mitosis until spindle assembly is complete. The gene product of MAD2 shows significant sequence similarity to the alpha-subunit of prenyltransferases. Here we isolate a new temperature-sensitive mad2 mutant, mad2-2ts, and find that Mad2p is required ... for the membrane association of Ypt1p and Sec4p, two prenylated small GTP-binding proteins involved in protein trafficking. Extracts from mad2-2ts mutant cells fail to geranylgeranylate a number of substrates at the non-permissive temperature. mad2-2ts is synthetically lethal with bet2-1, a mutation in the gene that encodes for the beta-subunit of the Ypt1p and Sec4p geranylgeranyl transferase. Therefore MAD2 and BET2 gene products may physically interact to form a geranylgeranyl transferase complex. In addition, the difference between the phenotypes of mad2-1 and mad2-2ts suggests that MAD2 has distinct roles in protein transport and the mitotic feedback control.
Mesh Terms:
Calcium-Binding Proteins, Carrier Proteins, Cell Cycle Proteins, Crosses, Genetic, Fungal Proteins, GTP-Binding Proteins, Membrane Proteins, Molecular Sequence Data, Mutation, Nuclear Proteins, Protein Prenylation, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Transferases, rab GTP-Binding Proteins
Calcium-Binding Proteins, Carrier Proteins, Cell Cycle Proteins, Crosses, Genetic, Fungal Proteins, GTP-Binding Proteins, Membrane Proteins, Molecular Sequence Data, Mutation, Nuclear Proteins, Protein Prenylation, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Transferases, rab GTP-Binding Proteins
Nature
Date: Nov. 04, 1993
PubMed ID: 8232541
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