title: Shp1, a regulator of protein phosphatase 1 Glc7, has important roles in cell morphogenesis, cell cycle progression and DNA damage response in Candida albicans.
abstract: In yeast, the type 1 protein phosphatase (PP1) catalytic subunit Glc7 is involved in the regulation of multiple cellular processes and thought to achieve specificity through association with different regulatory subunits. Here, we report that the Glc7 regulator Shp1 plays important roles in cell morphogenesis, cell cycle progression and DNA damage response in Candida albicans. SHP1 deletion caused the formation of rod-shaped yeast cells with slow growth. Flow cytometry analysis revealed that shp1Δ cells showed a prolonged G(2)/M phase, which was rescued by deleting the spindle-checkpoint gene MAD2. Furthermore, shp1Δ cells were hypersensitive to heat and genotoxic stresses. Interestingly, depletion of Glc7 caused defects similar to the shp1Δ mutant such as arrest at G(2)/M transition; and the GLC7/glc7Δ heterozygous mutant exhibited increased sensitivity to genotoxic stresses, consistent with the recent finding that Saccharomyces cerevisiae Glc7 has a role in DNA damage response. We also show that Shp1 is required for the nuclear accumulation of Glc7, suggesting that Shp1 executes its cellular function partly by regulating Glc7 localization.
authors.affiliation: Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Sciences, Beijing Normal University, Beijing 100875, People's Republic of China.
authors.forename: Kangdi
authors.initials: K
authors.lastname: Hu
authors.forename: Wanjie
authors.initials: W
authors.lastname: Li
authors.forename: Haitao
authors.initials: H
authors.lastname: Wang
authors.forename: Kun
authors.initials: K
authors.lastname: Chen
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.forename: Jianli
authors.initials: J
authors.lastname: Sang
mesh_terms: D000595:Amino Acid Sequence; D002176:Candida albicans / Q000166:cytology* / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D002453:Cell Cycle; D002467:Cell Nucleus / Q000201:enzymology / Q000235:genetics; D004249:DNA Damage; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015971:Gene Expression Regulation, Enzymologic; D005809:Genes, Regulator; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D054645:Protein Phosphatase 1 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D021381:Protein Transport; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: D005656:Fungal Proteins; D047908:Intracellular Signaling Peptides and Proteins; C106691:SHP1 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D054645:Protein Phosphatase 1