Structural and functional dissection of Sec62p, a membrane-bound component of the yeast endoplasmic reticulum protein import machinery (original) (raw)

Abstract

SEC62 is required for the import of secretory protein precursors into the endoplasmic reticulum (ER) of Saccharomyces cerevisiae. The DNA sequence of SEC62 predicts a 32-kDa polypeptide with two potential membrane-spanning segments. Two antisera directed against different portions of the SEC62 coding region specifically detected a 30-kDa polypeptide in cell extracts. A combination of subcellular fractionation, detergent and alkali extraction, and indirect immunofluorescence studies indicated that Sec62p is intimately associated with the ER membrane. Protease digestion of intact microsomes and analysis of the oligosaccharide content of a set of Sec62p-invertase hybrid proteins suggested that Sec62p spans the ER membrane twice, displaying hydrophilic amino- and carboxy-terminal domains towards the cytosol. Sec62p-invertase hybrid proteins that lack the Sec62p C terminus failed to complement the sec62-l mutation and dramatically inhibited the growth of sec62-l cells at a normally permissive temperature. The inhibitory action of toxic Sec62p-invertase hybrids was partially counteracted by the overexpression of Sec63p. Taken together, these data suggest that the C-terminal domain of Sec62p performs an essential function and that the N-terminal domain associates with other components of the translocation machinery, including Sec63p.

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  1. Andrews D. W., Lauffer L., Walter P., Lingappa V. R. Evidence for a two-step mechanism involved in assembly of functional signal recognition particle receptor. J Cell Biol. 1989 Mar;108(3):797–810. doi: 10.1083/jcb.108.3.797. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Bankaitis V. A., Johnson L. M., Emr S. D. Isolation of yeast mutants defective in protein targeting to the vacuole. Proc Natl Acad Sci U S A. 1986 Dec;83(23):9075–9079. doi: 10.1073/pnas.83.23.9075. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Bassford P. J., Jr, Silhavy T. J., Beckwith J. R. Use of gene fusion to study secretion of maltose-binding protein into Escherichia coli periplasm. J Bacteriol. 1979 Jul;139(1):19–31. doi: 10.1128/jb.139.1.19-31.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Bernstein H. D., Poritz M. A., Strub K., Hoben P. J., Brenner S., Walter P. Model for signal sequence recognition from amino-acid sequence of 54K subunit of signal recognition particle. Nature. 1989 Aug 10;340(6233):482–486. doi: 10.1038/340482a0. [DOI] [PubMed] [Google Scholar]
  5. Bernstein H. D., Rapoport T. A., Walter P. Cytosolic protein translocation factors. Is SRP still unique? Cell. 1989 Sep 22;58(6):1017–1019. doi: 10.1016/0092-8674(89)90497-2. [DOI] [PubMed] [Google Scholar]
  6. Bernstein M., Hoffmann W., Ammerer G., Schekman R. Characterization of a gene product (Sec53p) required for protein assembly in the yeast endoplasmic reticulum. J Cell Biol. 1985 Dec;101(6):2374–2382. doi: 10.1083/jcb.101.6.2374. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Bernstein M., Kepes F., Schekman R. Sec59 encodes a membrane protein required for core glycosylation in Saccharomyces cerevisiae. Mol Cell Biol. 1989 Mar;9(3):1191–1199. doi: 10.1128/mcb.9.3.1191. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Bole D. G., Hendershot L. M., Kearney J. F. Posttranslational association of immunoglobulin heavy chain binding protein with nascent heavy chains in nonsecreting and secreting hybridomas. J Cell Biol. 1986 May;102(5):1558–1566. doi: 10.1083/jcb.102.5.1558. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Böhni P. C., Deshaies R. J., Schekman R. W. SEC11 is required for signal peptide processing and yeast cell growth. J Cell Biol. 1988 Apr;106(4):1035–1042. doi: 10.1083/jcb.106.4.1035. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Chirico W. J., Waters M. G., Blobel G. 70K heat shock related proteins stimulate protein translocation into microsomes. Nature. 1988 Apr 28;332(6167):805–810. doi: 10.1038/332805a0. [DOI] [PubMed] [Google Scholar]
  11. Deshaies R. J., Kepes F., Böhni P. C. Genetic dissection of the early stages of protein secretion in yeast. Trends Genet. 1989 Mar;5(3):87–93. doi: 10.1016/0168-9525(89)90032-2. [DOI] [PubMed] [Google Scholar]
  12. Deshaies R. J., Koch B. D., Werner-Washburne M., Craig E. A., Schekman R. A subfamily of stress proteins facilitates translocation of secretory and mitochondrial precursor polypeptides. Nature. 1988 Apr 28;332(6167):800–805. doi: 10.1038/332800a0. [DOI] [PubMed] [Google Scholar]
  13. Deshaies R. J., Schekman R. A yeast mutant defective at an early stage in import of secretory protein precursors into the endoplasmic reticulum. J Cell Biol. 1987 Aug;105(2):633–645. doi: 10.1083/jcb.105.2.633. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Deshaies R. J., Schekman R. SEC62 encodes a putative membrane protein required for protein translocation into the yeast endoplasmic reticulum. J Cell Biol. 1989 Dec;109(6 Pt 1):2653–2664. doi: 10.1083/jcb.109.6.2653. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Dieckmann C. L., Tzagoloff A. Assembly of the mitochondrial membrane system. CBP6, a yeast nuclear gene necessary for synthesis of cytochrome b. J Biol Chem. 1985 Feb 10;260(3):1513–1520. [PubMed] [Google Scholar]
  16. Dihanich M. The biogenesis and function of eukaryotic porins. Experientia. 1990 Feb 15;46(2):146–153. doi: 10.1007/BF02027310. [DOI] [PubMed] [Google Scholar]
  17. Field J., Xu H. P., Michaeli T., Ballester R., Sass P., Wigler M., Colicelli J. Mutations of the adenylyl cyclase gene that block RAS function in Saccharomyces cerevisiae. Science. 1990 Jan 26;247(4941):464–467. doi: 10.1126/science.2405488. [DOI] [PubMed] [Google Scholar]
  18. Fujiki Y., Hubbard A. L., Fowler S., Lazarow P. B. Isolation of intracellular membranes by means of sodium carbonate treatment: application to endoplasmic reticulum. J Cell Biol. 1982 Apr;93(1):97–102. doi: 10.1083/jcb.93.1.97. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Goud B., Salminen A., Walworth N. C., Novick P. J. A GTP-binding protein required for secretion rapidly associates with secretory vesicles and the plasma membrane in yeast. Cell. 1988 Jun 3;53(5):753–768. doi: 10.1016/0092-8674(88)90093-1. [DOI] [PubMed] [Google Scholar]
  20. Hann B. C., Poritz M. A., Walter P. Saccharomyces cerevisiae and Schizosaccharomyces pombe contain a homologue to the 54-kD subunit of the signal recognition particle that in S. cerevisiae is essential for growth. J Cell Biol. 1989 Dec;109(6 Pt 2):3223–3230. doi: 10.1083/jcb.109.6.3223. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Hartmann E., Rapoport T. A., Lodish H. F. Predicting the orientation of eukaryotic membrane-spanning proteins. Proc Natl Acad Sci U S A. 1989 Aug;86(15):5786–5790. doi: 10.1073/pnas.86.15.5786. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Hicke L., Schekman R. Yeast Sec23p acts in the cytoplasm to promote protein transport from the endoplasmic reticulum to the Golgi complex in vivo and in vitro. EMBO J. 1989 Jun;8(6):1677–1684. doi: 10.1002/j.1460-2075.1989.tb03559.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. 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]
  24. Johnson L. M., Bankaitis V. A., Emr S. D. Distinct sequence determinants direct intracellular sorting and modification of a yeast vacuolar protease. Cell. 1987 Mar 13;48(5):875–885. doi: 10.1016/0092-8674(87)90084-5. [DOI] [PubMed] [Google Scholar]
  25. Kaiser C. A., Botstein D. Efficiency and diversity of protein localization by random signal sequences. Mol Cell Biol. 1990 Jun;10(6):3163–3173. doi: 10.1128/mcb.10.6.3163. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Kleffel B., Garavito R. M., Baumeister W., Rosenbusch J. P. Secondary structure of a channel-forming protein: porin from E. coli outer membranes. EMBO J. 1985 Jun;4(6):1589–1592. doi: 10.1002/j.1460-2075.1985.tb03821.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Lodish H. F. Multi-spanning membrane proteins: how accurate are the models? Trends Biochem Sci. 1988 Sep;13(9):332–334. doi: 10.1016/0968-0004(88)90101-6. [DOI] [PubMed] [Google Scholar]
  28. Manoil C., Beckwith J. A genetic approach to analyzing membrane protein topology. Science. 1986 Sep 26;233(4771):1403–1408. doi: 10.1126/science.3529391. [DOI] [PubMed] [Google Scholar]
  29. Manoil C., Mekalanos J. J., Beckwith J. Alkaline phosphatase fusions: sensors of subcellular location. J Bacteriol. 1990 Feb;172(2):515–518. doi: 10.1128/jb.172.2.515-518.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Markwell M. A., Haas S. M., Bieber L. L., Tolbert N. E. A modification of the Lowry procedure to simplify protein determination in membrane and lipoprotein samples. Anal Biochem. 1978 Jun 15;87(1):206–210. doi: 10.1016/0003-2697(78)90586-9. [DOI] [PubMed] [Google Scholar]
  31. Munro S., Pelham H. R. A C-terminal signal prevents secretion of luminal ER proteins. Cell. 1987 Mar 13;48(5):899–907. doi: 10.1016/0092-8674(87)90086-9. [DOI] [PubMed] [Google Scholar]
  32. Nilsson B., Abrahmsén L., Uhlén M. Immobilization and purification of enzymes with staphylococcal protein A gene fusion vectors. EMBO J. 1985 Apr;4(4):1075–1080. doi: 10.1002/j.1460-2075.1985.tb03741.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  33. Normington K., Kohno K., Kozutsumi Y., Gething M. J., Sambrook J. S. cerevisiae encodes an essential protein homologous in sequence and function to mammalian BiP. Cell. 1989 Jun 30;57(7):1223–1236. doi: 10.1016/0092-8674(89)90059-7. [DOI] [PubMed] [Google Scholar]
  34. Novick P., Field C., Schekman R. Identification of 23 complementation groups required for post-translational events in the yeast secretory pathway. Cell. 1980 Aug;21(1):205–215. doi: 10.1016/0092-8674(80)90128-2. [DOI] [PubMed] [Google Scholar]
  35. Orlean P., Albright C., Robbins P. W. Cloning and sequencing of the yeast gene for dolichol phosphate mannose synthase, an essential protein. J Biol Chem. 1988 Nov 25;263(33):17499–17507. [PubMed] [Google Scholar]
  36. Powers S., O'Neill K., Wigler M. Dominant yeast and mammalian RAS mutants that interfere with the CDC25-dependent activation of wild-type RAS in Saccharomyces cerevisiae. Mol Cell Biol. 1989 Feb;9(2):390–395. doi: 10.1128/mcb.9.2.390. [DOI] [PMC free article] [PubMed] [Google Scholar]
  37. Pringle J. R., Preston R. A., Adams A. E., Stearns T., Drubin D. G., Haarer B. K., Jones E. W. Fluorescence microscopy methods for yeast. Methods Cell Biol. 1989;31:357–435. doi: 10.1016/s0091-679x(08)61620-9. [DOI] [PubMed] [Google Scholar]
  38. Roberts C. J., Pohlig G., Rothman J. H., Stevens T. H. Structure, biosynthesis, and localization of dipeptidyl aminopeptidase B, an integral membrane glycoprotein of the yeast vacuole. J Cell Biol. 1989 Apr;108(4):1363–1373. doi: 10.1083/jcb.108.4.1363. [DOI] [PMC free article] [PubMed] [Google Scholar]
  39. Rose M. D., Misra L. M., Vogel J. P. KAR2, a karyogamy gene, is the yeast homolog of the mammalian BiP/GRP78 gene. Cell. 1989 Jun 30;57(7):1211–1221. doi: 10.1016/0092-8674(89)90058-5. [DOI] [PubMed] [Google Scholar]
  40. Rothblatt J. A., Deshaies R. J., Sanders S. L., Daum G., Schekman R. Multiple genes are required for proper insertion of secretory proteins into the endoplasmic reticulum in yeast. J Cell Biol. 1989 Dec;109(6 Pt 1):2641–2652. doi: 10.1083/jcb.109.6.2641. [DOI] [PMC free article] [PubMed] [Google Scholar]
  41. Rothblatt J. A., Meyer D. I. Secretion in yeast: reconstitution of the translocation and glycosylation of alpha-factor and invertase in a homologous cell-free system. Cell. 1986 Feb 28;44(4):619–628. doi: 10.1016/0092-8674(86)90271-0. [DOI] [PubMed] [Google Scholar]
  42. Römisch K., Webb J., Herz J., Prehn S., Frank R., Vingron M., Dobberstein B. Homology of 54K protein of signal-recognition particle, docking protein and two E. coli proteins with putative GTP-binding domains. Nature. 1989 Aug 10;340(6233):478–482. doi: 10.1038/340478a0. [DOI] [PubMed] [Google Scholar]
  43. Sadler I., Chiang A., Kurihara T., Rothblatt J., Way J., Silver P. A yeast gene important for protein assembly into the endoplasmic reticulum and the nucleus has homology to DnaJ, an Escherichia coli heat shock protein. J Cell Biol. 1989 Dec;109(6 Pt 1):2665–2675. doi: 10.1083/jcb.109.6.2665. [DOI] [PMC free article] [PubMed] [Google Scholar]
  44. Schauer I., Emr S., Gross C., Schekman R. Invertase signal and mature sequence substitutions that delay intercompartmental transport of active enzyme. J Cell Biol. 1985 May;100(5):1664–1675. doi: 10.1083/jcb.100.5.1664. [DOI] [PMC free article] [PubMed] [Google Scholar]
  45. Scott J. H., Schekman R. Lyticase: endoglucanase and protease activities that act together in yeast cell lysis. J Bacteriol. 1980 May;142(2):414–423. doi: 10.1128/jb.142.2.414-423.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
  46. Sengstag C., Stirling C., Schekman R., Rine J. Genetic and biochemical evaluation of eucaryotic membrane protein topology: multiple transmembrane domains of Saccharomyces cerevisiae 3-hydroxy-3-methylglutaryl coenzyme A reductase. Mol Cell Biol. 1990 Feb;10(2):672–680. doi: 10.1128/mcb.10.2.672. [DOI] [PMC free article] [PubMed] [Google Scholar]
  47. Stanley K. K., Luzio J. P. Construction of a new family of high efficiency bacterial expression vectors: identification of cDNA clones coding for human liver proteins. EMBO J. 1984 Jun;3(6):1429–1434. doi: 10.1002/j.1460-2075.1984.tb01988.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  48. Taussig R., Carlson M. Nucleotide sequence of the yeast SUC2 gene for invertase. Nucleic Acids Res. 1983 Mar 25;11(6):1943–1954. doi: 10.1093/nar/11.6.1943. [DOI] [PMC free article] [PubMed] [Google Scholar]
  49. Toyn J., Hibbs A. R., Sanz P., Crowe J., Meyer D. I. In vivo and in vitro analysis of ptl1, a yeast ts mutant with a membrane-associated defect in protein translocation. EMBO J. 1988 Dec 20;7(13):4347–4353. doi: 10.1002/j.1460-2075.1988.tb03333.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  50. Vieira J., Messing J. Production of single-stranded plasmid DNA. Methods Enzymol. 1987;153:3–11. doi: 10.1016/0076-6879(87)53044-0. [DOI] [PubMed] [Google Scholar]
  51. Vogel J. P., Misra L. M., Rose M. D. Loss of BiP/GRP78 function blocks translocation of secretory proteins in yeast. J Cell Biol. 1990 Jun;110(6):1885–1895. doi: 10.1083/jcb.110.6.1885. [DOI] [PMC free article] [PubMed] [Google Scholar]
  52. Wessels H. P., Spiess M. Insertion of a multispanning membrane protein occurs sequentially and requires only one signal sequence. Cell. 1988 Oct 7;55(1):61–70. doi: 10.1016/0092-8674(88)90009-8. [DOI] [PubMed] [Google Scholar]