title: Mts4, a non-ATPase subunit of the 26 S protease in fission yeast is essential for mitosis and interacts directly with the ATPase subunit Mts2.
abstract: We have isolated a fission yeast gene, mts4(+), by complementation of a temperature-sensitive mutation and show that it encodes subunit 2 (S2) of the 19 S regulatory complex of the 26 S protease. mts4(+) is an essential gene, and we show that loss of this subunit causes cells to arrest in metaphase, illustrating the importance of S2 for mitosis. The Mts4 protein is 48% identical to S2 of the human 26 S protease, and the lethal phenotype of the null mts4 allele can be rescued by the human cDNA encoding S2. We provide genetic and physical evidence to suggest that the Mts4 protein interacts with the product of the mts2(+) gene, an ATPase which has previously been shown to be subunit 4 of the 26 S protease.
authors.affiliation: MRC Human Genetics Unit, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU Scotland, United Kingdom.
authors.forename: C R
authors.initials: CR
authors.lastname: Wilkinson
authors.forename: M
authors.initials: M
authors.lastname: Wallace
authors.forename: M
authors.initials: M
authors.lastname: Seeger
authors.forename: W
authors.initials: W
authors.lastname: Dubiel
authors.forename: C
authors.initials: C
authors.lastname: Gordon
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000483:Alleles; D000595:Amino Acid Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins; D002470:Cell Survival; D050762:Cyclin-Dependent Kinase Inhibitor p15; D019941:Cyclin-Dependent Kinase Inhibitor p16; D003546:Cysteine Endopeptidases; D010450:Endopeptidases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008938:Mitosis; D008969:Molecular Sequence Data; D010447:Peptide Hydrolases / Q000737:chemistry / Q000378:metabolism*; D046988:Proteasome Endopeptidase Complex; D011485:Protein Binding; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D015183:Restriction Mapping; D029701:Saccharomyces cerevisiae Proteins; D012568:Schizosaccharomyces; D029702:Schizosaccharomyces pombe Proteins; D047992:TNF Receptor-Associated Factor 2; D047988:Tumor Necrosis Factor Receptor-Associated Peptides and Proteins; D025521:Tumor Suppressor Proteins
chemical_list: C493966:CDKN2B protein, human; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D050762:Cyclin-Dependent Kinase Inhibitor p15; D019941:Cyclin-Dependent Kinase Inhibitor p16; D005656:Fungal Proteins; D047908:Intracellular Signaling Peptides and Proteins; C108670:MTS4 protein, S pombe; C101338:PSMD2 protein, human; D011506:Proteins; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D047992:TNF Receptor-Associated Factor 2; D047988:Tumor Necrosis Factor Receptor-Associated Peptides and Proteins; D025521:Tumor Suppressor Proteins; D010450:Endopeptidases; D010447:Peptide Hydrolases; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; C061553:ATP dependent 26S protease; C084436:rpt2 protein, S pombe; D000251:Adenosine Triphosphatases