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. 1990 Sep;10(9):4744–4756. doi: 10.1128/mcb.10.9.4744

The N-terminal TPR region is the functional domain of SSN6, a nuclear phosphoprotein of Saccharomyces cerevisiae.

J Schultz 1, L Marshall-Carlson 1, M Carlson 1
PMCID: PMC361075  PMID: 2201901

Abstract

The SSN6 protein functions as a negative regulator of a variety of genes in Saccharomyces cerevisiae and is required for normal growth, mating, and sporulation. It is a member of a family defined by a repeated amino acid sequence, the TPR (tetratricopeptide repeat) motif. Here, we have used specific antibody to identify and characterize the SSN6 protein. Both SSN6 and a bifunctional SSN6-beta-galactosidase fusion protein were localized in the nucleus by immunofluorescence staining. The N-terminal one-third of the protein containing the TPR units was identified as the region that is important for SSN6 function. Analysis of four nonsense alleles, isolated as intragenic suppressors of an ssn6::URA3 insertion, revealed that polypeptides truncated after TPR unit 7 provide SSN6 function. Deletion analysis suggested that TPR units are required but that 4 of the 10 TPR units are sufficient. In addition, deletion studies indicated that three very long, homogeneous tracts of polyglutamine and poly(glutamine-alanine) are dispensable. Previous genetic evidence suggested the SSN6 protein as a possible target of the SNF1 protein kinase. Here, we show that the C terminus of SSN6 is phosphorylated in vivo and that the SNF1 kinase is not responsible for most of the phosphorylation. Finally, SSN6 has a modest effect on the maintenance of minichromosomes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Beemon K., Hunter T. Characterization of Rous sarcoma virus src gene products synthesized in vitro. J Virol. 1978 Nov;28(2):551–566. doi: 10.1128/jvi.28.2.551-566.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Bhown A. S., Bennett J. C. High-sensitivity sequence analysis of proteins recovered from sodium dodecyl sulfate gels. Methods Enzymol. 1983;91:450–455. doi: 10.1016/s0076-6879(83)91042-x. [DOI] [PubMed] [Google Scholar]
  3. Boeke J. D., LaCroute F., Fink G. R. A positive selection for mutants lacking orotidine-5'-phosphate decarboxylase activity in yeast: 5-fluoro-orotic acid resistance. Mol Gen Genet. 1984;197(2):345–346. doi: 10.1007/BF00330984. [DOI] [PubMed] [Google Scholar]
  4. Botstein D., Falco S. C., Stewart S. E., Brennan M., Scherer S., Stinchcomb D. T., Struhl K., Davis R. W. Sterile host yeasts (SHY): a eukaryotic system of biological containment for recombinant DNA experiments. Gene. 1979 Dec;8(1):17–24. doi: 10.1016/0378-1119(79)90004-0. [DOI] [PubMed] [Google Scholar]
  5. Carlson M., Osmond B. C., Botstein D. Mutants of yeast defective in sucrose utilization. Genetics. 1981 May;98(1):25–40. doi: 10.1093/genetics/98.1.25. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Carlson M., Osmond B. C., Neigeborn L., Botstein D. A suppressor of SNF1 mutations causes constitutive high-level invertase synthesis in yeast. Genetics. 1984 May;107(1):19–32. doi: 10.1093/genetics/107.1.19. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Celenza J. L., Carlson M. A yeast gene that is essential for release from glucose repression encodes a protein kinase. Science. 1986 Sep 12;233(4769):1175–1180. doi: 10.1126/science.3526554. [DOI] [PubMed] [Google Scholar]
  8. Celenza J. L., Carlson M. Mutational analysis of the Saccharomyces cerevisiae SNF1 protein kinase and evidence for functional interaction with the SNF4 protein. Mol Cell Biol. 1989 Nov;9(11):5034–5044. doi: 10.1128/mcb.9.11.5034. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Celenza J. L., Marshall-Carlson L., Carlson M. The yeast SNF3 gene encodes a glucose transporter homologous to the mammalian protein. Proc Natl Acad Sci U S A. 1988 Apr;85(7):2130–2134. doi: 10.1073/pnas.85.7.2130. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Cooper J. A., Sefton B. M., Hunter T. Detection and quantification of phosphotyrosine in proteins. Methods Enzymol. 1983;99:387–402. doi: 10.1016/0076-6879(83)99075-4. [DOI] [PubMed] [Google Scholar]
  11. Courey A. J., Tjian R. Analysis of Sp1 in vivo reveals multiple transcriptional domains, including a novel glutamine-rich activation motif. Cell. 1988 Dec 2;55(5):887–898. doi: 10.1016/0092-8674(88)90144-4. [DOI] [PubMed] [Google Scholar]
  12. Fassler J. S., Winston F. The Saccharomyces cerevisiae SPT13/GAL11 gene has both positive and negative regulatory roles in transcription. Mol Cell Biol. 1989 Dec;9(12):5602–5609. doi: 10.1128/mcb.9.12.5602. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Fjose A., McGinnis W. J., Gehring W. J. Isolation of a homoeo box-containing gene from the engrailed region of Drosophila and the spatial distribution of its transcripts. Nature. 1985 Jan 24;313(6000):284–289. doi: 10.1038/313284a0. [DOI] [PubMed] [Google Scholar]
  14. Goldstein A., Lampen J. O. Beta-D-fructofuranoside fructohydrolase from yeast. Methods Enzymol. 1975;42:504–511. doi: 10.1016/0076-6879(75)42159-0. [DOI] [PubMed] [Google Scholar]
  15. Hartwell L. H., Smith D. Altered fidelity of mitotic chromosome transmission in cell cycle mutants of S. cerevisiae. Genetics. 1985 Jul;110(3):381–395. doi: 10.1093/genetics/110.3.381. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Heusterspreute M., Oberto J., Vinh H. T., Davison J. Vectors with restriction-site banks. III. Escherichia coli-Saccharomyces cerevisiae shuttle vectors. Gene. 1985;34(2-3):363–366. doi: 10.1016/0378-1119(85)90146-5. [DOI] [PubMed] [Google Scholar]
  17. Hill J. E., Myers A. M., Koerner T. J., Tzagoloff A. Yeast/E. coli shuttle vectors with multiple unique restriction sites. Yeast. 1986 Sep;2(3):163–167. doi: 10.1002/yea.320020304. [DOI] [PubMed] [Google Scholar]
  18. Hirano T., Hiraoka Y., Yanagida M. A temperature-sensitive mutation of the Schizosaccharomyces pombe gene nuc2+ that encodes a nuclear scaffold-like protein blocks spindle elongation in mitotic anaphase. J Cell Biol. 1988 Apr;106(4):1171–1183. doi: 10.1083/jcb.106.4.1171. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Hirano T., Kinoshita N., Morikawa K., Yanagida M. Snap helix with knob and hole: essential repeats in S. pombe nuclear protein nuc2+. Cell. 1990 Jan 26;60(2):319–328. doi: 10.1016/0092-8674(90)90746-2. [DOI] [PubMed] [Google Scholar]
  20. Hoffman C. S., Winston F. A ten-minute DNA preparation from yeast efficiently releases autonomous plasmids for transformation of Escherichia coli. Gene. 1987;57(2-3):267–272. doi: 10.1016/0378-1119(87)90131-4. [DOI] [PubMed] [Google Scholar]
  21. Ito H., Fukuda Y., Murata K., Kimura A. Transformation of intact yeast cells treated with alkali cations. J Bacteriol. 1983 Jan;153(1):163–168. doi: 10.1128/jb.153.1.163-168.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Julius D., Blair L., Brake A., Sprague G., Thorner J. Yeast alpha factor is processed from a larger precursor polypeptide: the essential role of a membrane-bound dipeptidyl aminopeptidase. Cell. 1983 Mar;32(3):839–852. doi: 10.1016/0092-8674(83)90070-3. [DOI] [PubMed] [Google Scholar]
  23. Julius D., MacDermott A. B., Axel R., Jessell T. M. Molecular characterization of a functional cDNA encoding the serotonin 1c receptor. Science. 1988 Jul 29;241(4865):558–564. doi: 10.1126/science.3399891. [DOI] [PubMed] [Google Scholar]
  24. Julius D., Schekman R., Thorner J. Glycosylation and processing of prepro-alpha-factor through the yeast secretory pathway. Cell. 1984 Feb;36(2):309–318. doi: 10.1016/0092-8674(84)90224-1. [DOI] [PubMed] [Google Scholar]
  25. Kleid D. G., Yansura D., Small B., Dowbenko D., Moore D. M., Grubman M. J., McKercher P. D., Morgan D. O., Robertson B. H., Bachrach H. L. Cloned viral protein vaccine for foot-and-mouth disease: responses in cattle and swine. Science. 1981 Dec 4;214(4525):1125–1129. doi: 10.1126/science.6272395. [DOI] [PubMed] [Google Scholar]
  26. Kuenzel E. A., Mulligan J. A., Sommercorn J., Krebs E. G. Substrate specificity determinants for casein kinase II as deduced from studies with synthetic peptides. J Biol Chem. 1987 Jul 5;262(19):9136–9140. [PubMed] [Google Scholar]
  27. Laemmli U. K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970 Aug 15;227(5259):680–685. doi: 10.1038/227680a0. [DOI] [PubMed] [Google Scholar]
  28. Laughon A., Boulet A. M., Bermingham J. R., Jr, Laymon R. A., Scott M. P. Structure of transcripts from the homeotic Antennapedia gene of Drosophila melanogaster: two promoters control the major protein-coding region. Mol Cell Biol. 1986 Dec;6(12):4676–4689. doi: 10.1128/mcb.6.12.4676. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Lemontt J. F., Fugit D. R., Mackay V. L. Pleiotropic Mutations at the TUP1 Locus That Affect the Expression of Mating-Type-Dependent Functions in SACCHAROMYCES CEREVISIAE. Genetics. 1980 Apr;94(4):899–920. doi: 10.1093/genetics/94.4.899. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Lillie S. H., Brown S. S. Artifactual immunofluorescent labelling in yeast, demonstrated by affinity purification of antibody. Yeast. 1987 Jun;3(2):63–70. doi: 10.1002/yea.320030202. [DOI] [PubMed] [Google Scholar]
  31. Maine G. T., Sinha P., Tye B. K. Mutants of S. cerevisiae defective in the maintenance of minichromosomes. Genetics. 1984 Mar;106(3):365–385. doi: 10.1093/genetics/106.3.365. [DOI] [PMC free article] [PubMed] [Google Scholar]
  32. Mermod N., O'Neill E. A., Kelly T. J., Tjian R. The proline-rich transcriptional activator of CTF/NF-I is distinct from the replication and DNA binding domain. Cell. 1989 Aug 25;58(4):741–753. doi: 10.1016/0092-8674(89)90108-6. [DOI] [PubMed] [Google Scholar]
  33. Miesfeld R., Rusconi S., Godowski P. J., Maler B. A., Okret S., Wikström A. C., Gustafsson J. A., Yamamoto K. R. Genetic complementation of a glucocorticoid receptor deficiency by expression of cloned receptor cDNA. Cell. 1986 Aug 1;46(3):389–399. doi: 10.1016/0092-8674(86)90659-8. [DOI] [PubMed] [Google Scholar]
  34. Morris N. R. Mitotic mutants of Aspergillus nidulans. Genet Res. 1975 Dec;26(3):237–254. doi: 10.1017/s0016672300016049. [DOI] [PubMed] [Google Scholar]
  35. Myers A. M., Tzagoloff A., Kinney D. M., Lusty C. J. Yeast shuttle and integrative vectors with multiple cloning sites suitable for construction of lacZ fusions. Gene. 1986;45(3):299–310. doi: 10.1016/0378-1119(86)90028-4. [DOI] [PubMed] [Google Scholar]
  36. Neigeborn L., Carlson M. Mutations causing constitutive invertase synthesis in yeast: genetic interactions with snf mutations. Genetics. 1987 Feb;115(2):247–253. doi: 10.1093/genetics/115.2.247. [DOI] [PMC free article] [PubMed] [Google Scholar]
  37. Norrander J., Kempe T., Messing J. Construction of improved M13 vectors using oligodeoxynucleotide-directed mutagenesis. Gene. 1983 Dec;26(1):101–106. doi: 10.1016/0378-1119(83)90040-9. [DOI] [PubMed] [Google Scholar]
  38. Orr-Weaver T. L., Szostak J. W., Rothstein R. J. Yeast transformation: a model system for the study of recombination. Proc Natl Acad Sci U S A. 1981 Oct;78(10):6354–6358. doi: 10.1073/pnas.78.10.6354. [DOI] [PMC free article] [PubMed] [Google Scholar]
  39. Pinkham J. L., Olesen J. T., Guarente L. P. Sequence and nuclear localization of the Saccharomyces cerevisiae HAP2 protein, a transcriptional activator. Mol Cell Biol. 1987 Feb;7(2):578–585. doi: 10.1128/mcb.7.2.578. [DOI] [PMC free article] [PubMed] [Google Scholar]
  40. Pirrotta V., Manet E., Hardon E., Bickel S. E., Benson M. Structure and sequence of the Drosophila zeste gene. EMBO J. 1987 Mar;6(3):791–799. doi: 10.1002/j.1460-2075.1987.tb04821.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  41. Poole S. J., Kauvar L. M., Drees B., Kornberg T. The engrailed locus of Drosophila: structural analysis of an embryonic transcript. Cell. 1985 Jan;40(1):37–43. doi: 10.1016/0092-8674(85)90306-x. [DOI] [PubMed] [Google Scholar]
  42. Rhee S. K., Icho T., Wickner R. B. Structure and nuclear localization signal of the SKI3 antiviral protein of Saccharomyces cerevisiae. Yeast. 1989 May-Jun;5(3):149–158. doi: 10.1002/yea.320050304. [DOI] [PubMed] [Google Scholar]
  43. Rogers S., Wells R., Rechsteiner M. Amino acid sequences common to rapidly degraded proteins: the PEST hypothesis. Science. 1986 Oct 17;234(4774):364–368. doi: 10.1126/science.2876518. [DOI] [PubMed] [Google Scholar]
  44. Rose M. D., Novick P., Thomas J. H., Botstein D., Fink G. R. A Saccharomyces cerevisiae genomic plasmid bank based on a centromere-containing shuttle vector. Gene. 1987;60(2-3):237–243. doi: 10.1016/0378-1119(87)90232-0. [DOI] [PubMed] [Google Scholar]
  45. Rothstein R. J. One-step gene disruption in yeast. Methods Enzymol. 1983;101:202–211. doi: 10.1016/0076-6879(83)01015-0. [DOI] [PubMed] [Google Scholar]
  46. Rothstein R. J., Sherman F. Genes affecting the expression of cytochrome c in yeast: genetic mapping and genetic interactions. Genetics. 1980 Apr;94(4):871–889. doi: 10.1093/genetics/94.4.871. [DOI] [PMC free article] [PubMed] [Google Scholar]
  47. Sanger F., Nicklen S., Coulson A. R. DNA sequencing with chain-terminating inhibitors. Proc Natl Acad Sci U S A. 1977 Dec;74(12):5463–5467. doi: 10.1073/pnas.74.12.5463. [DOI] [PMC free article] [PubMed] [Google Scholar]
  48. Schamhart D. H., Ten Berge A. M., Van De Poll K. W. Isolation of a catabolite repression mutant of yeast as a revertant of a strain that is maltose negative in the respiratory-deficient state. J Bacteriol. 1975 Mar;121(3):747–752. doi: 10.1128/jb.121.3.747-752.1975. [DOI] [PMC free article] [PubMed] [Google Scholar]
  49. Sikorski R. S., Boguski M. S., Goebl M., Hieter P. A repeating amino acid motif in CDC23 defines a family of proteins and a new relationship among genes required for mitosis and RNA synthesis. Cell. 1990 Jan 26;60(2):307–317. doi: 10.1016/0092-8674(90)90745-z. [DOI] [PubMed] [Google Scholar]
  50. Sikorski R. S., Hieter P. A system of shuttle vectors and yeast host strains designed for efficient manipulation of DNA in Saccharomyces cerevisiae. Genetics. 1989 May;122(1):19–27. doi: 10.1093/genetics/122.1.19. [DOI] [PMC free article] [PubMed] [Google Scholar]
  51. Southern E. M. Detection of specific sequences among DNA fragments separated by gel electrophoresis. J Mol Biol. 1975 Nov 5;98(3):503–517. doi: 10.1016/s0022-2836(75)80083-0. [DOI] [PubMed] [Google Scholar]
  52. Spindler K. R., Rosser D. S., Berk A. J. Analysis of adenovirus transforming proteins from early regions 1A and 1B with antisera to inducible fusion antigens produced in Escherichia coli. J Virol. 1984 Jan;49(1):132–141. doi: 10.1128/jvi.49.1.132-141.1984. [DOI] [PMC free article] [PubMed] [Google Scholar]
  53. Stark H. C., Fugit D., Mowshowitz D. B. Pleiotropic properties of a yeast mutant insensitive to catabolite repression. Genetics. 1980 Apr;94(4):921–928. doi: 10.1093/genetics/94.4.921. [DOI] [PMC free article] [PubMed] [Google Scholar]
  54. Suzuki Y., Nogi Y., Abe A., Fukasawa T. GAL11 protein, an auxiliary transcription activator for genes encoding galactose-metabolizing enzymes in Saccharomyces cerevisiae. Mol Cell Biol. 1988 Nov;8(11):4991–4999. doi: 10.1128/mcb.8.11.4991. [DOI] [PMC free article] [PubMed] [Google Scholar]
  55. Thrash-Bingham C., Fangman W. L. A yeast mutation that stabilizes a plasmid bearing a mutated ARS1 element. Mol Cell Biol. 1989 Feb;9(2):809–816. doi: 10.1128/mcb.9.2.809. [DOI] [PMC free article] [PubMed] [Google Scholar]
  56. Towbin H., Staehelin T., Gordon J. Electrophoretic transfer of proteins from polyacrylamide gels to nitrocellulose sheets: procedure and some applications. Proc Natl Acad Sci U S A. 1979 Sep;76(9):4350–4354. doi: 10.1073/pnas.76.9.4350. [DOI] [PMC free article] [PubMed] [Google Scholar]
  57. Trumbly R. J. Cloning and characterization of the CYC8 gene mediating glucose repression in yeast. Gene. 1988 Dec 15;73(1):97–111. doi: 10.1016/0378-1119(88)90316-2. [DOI] [PubMed] [Google Scholar]
  58. Trumbly R. J. Isolation of Saccharomyces cerevisiae mutants constitutive for invertase synthesis. J Bacteriol. 1986 Jun;166(3):1123–1127. doi: 10.1128/jb.166.3.1123-1127.1986. [DOI] [PMC free article] [PubMed] [Google Scholar]
  59. Wharton K. A., Yedvobnick B., Finnerty V. G., Artavanis-Tsakonas S. opa: a novel family of transcribed repeats shared by the Notch locus and other developmentally regulated loci in D. melanogaster. Cell. 1985 Jan;40(1):55–62. doi: 10.1016/0092-8674(85)90308-3. [DOI] [PubMed] [Google Scholar]
  60. Wickner R. B. Mutants of Saccharomyces cerevisiae that incorporate deoxythymidine-5'-monophosphate into deoxyribonucleic acid in vivo. J Bacteriol. 1974 Jan;117(1):252–260. doi: 10.1128/jb.117.1.252-260.1974. [DOI] [PMC free article] [PubMed] [Google Scholar]
  61. Yanisch-Perron C., Vieira J., Messing J. Improved M13 phage cloning vectors and host strains: nucleotide sequences of the M13mp18 and pUC19 vectors. Gene. 1985;33(1):103–119. doi: 10.1016/0378-1119(85)90120-9. [DOI] [PubMed] [Google Scholar]

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