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. 1995 Mar 1;128(5):721–736. doi: 10.1083/jcb.128.5.721

Reconstituted nuclei depleted of a vertebrate GLFG nuclear pore protein, p97, import but are defective in nuclear growth and replication

PMCID: PMC2120401  PMID: 7876300

Abstract

Xenopus egg extracts provide a powerful system for in vitro reconstitution of nuclei and analysis of nuclear transport. Such cell- free extracts contain three major N-acetylglucosaminylated proteins: p200, p97, and p60. Both p200 and p60 have been found to be components of the nuclear pore. Here, the role of p97 has been investigated. Xenopus p97 was isolated and antisera were raised and affinity purified. Immunolocalization experiments indicate that p97 is present in a punctate pattern on the nuclear envelope and also in the nuclear interior. Peptide sequence analysis reveals that p97 contains a GLFG motif which defines a family of yeast nuclear pore proteins, as well as a peptide that is identical at 11/15 amino acids to a specific member of the GLFG family, NUP116. An additional peptide is highly homologous to a second sequence found in NUP116 and other members of the yeast GLFG family. A monoclonal antibody to the GLFG domain cross-reacts with a major Xenopus protein of 97 kD and polyclonal antiserum to p97 recognizes the yeast GLFG nucleoporin family. The p97 antiserum was used to immunodeplete Xenopus egg cytosol and p97-deficient nuclei were reconstituted. The p97-depleted nuclei remained largely competent for nuclear protein import. However, in contrast to control nuclei, nuclei deficient in p97 fail to grow in size over time and do not replicate their chromosomal DNA. ssDNA replication in such extracts remains unaffected. Addition of the N-acetylglucosaminylated nuclear proteins of Xenopus or rat reverses these replication and growth defects. The possible role(s) of p97 in these nuclear functions is discussed.

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Selected References

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  1. Adachi Y., Laemmli U. K. Identification of nuclear pre-replication centers poised for DNA synthesis in Xenopus egg extracts: immunolocalization study of replication protein A. J Cell Biol. 1992 Oct;119(1):1–15. doi: 10.1083/jcb.119.1.1. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Adachi Y., Laemmli U. K. Study of the cell cycle-dependent assembly of the DNA pre-replication centres in Xenopus egg extracts. EMBO J. 1994 Sep 1;13(17):4153–4164. doi: 10.1002/j.1460-2075.1994.tb06733.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Adam S. A., Gerace L. Cytosolic proteins that specifically bind nuclear location signals are receptors for nuclear import. Cell. 1991 Sep 6;66(5):837–847. doi: 10.1016/0092-8674(91)90431-w. [DOI] [PubMed] [Google Scholar]
  4. Akey C. W., Goldfarb D. S. Protein import through the nuclear pore complex is a multistep process. J Cell Biol. 1989 Sep;109(3):971–982. doi: 10.1083/jcb.109.3.971. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Akey C. W. Interactions and structure of the nuclear pore complex revealed by cryo-electron microscopy. J Cell Biol. 1989 Sep;109(3):955–970. doi: 10.1083/jcb.109.3.955. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Almouzni G., Wolffe A. P. Nuclear assembly, structure, and function: the use of Xenopus in vitro systems. Exp Cell Res. 1993 Mar;205(1):1–15. doi: 10.1006/excr.1993.1051. [DOI] [PubMed] [Google Scholar]
  7. Altschul S. F., Gish W., Miller W., Myers E. W., Lipman D. J. Basic local alignment search tool. J Mol Biol. 1990 Oct 5;215(3):403–410. doi: 10.1016/S0022-2836(05)80360-2. [DOI] [PubMed] [Google Scholar]
  8. Bauer D. W., Murphy C., Wu Z., Wu C. H., Gall J. G. In vitro assembly of coiled bodies in Xenopus egg extract. Mol Biol Cell. 1994 Jun;5(6):633–644. doi: 10.1091/mbc.5.6.633. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Blobel G., Potter V. R. Nuclei from rat liver: isolation method that combines purity with high yield. Science. 1966 Dec 30;154(3757):1662–1665. doi: 10.1126/science.154.3757.1662. [DOI] [PubMed] [Google Scholar]
  10. Blow J. J., Laskey R. A. Initiation of DNA replication in nuclei and purified DNA by a cell-free extract of Xenopus eggs. Cell. 1986 Nov 21;47(4):577–587. doi: 10.1016/0092-8674(86)90622-7. [DOI] [PubMed] [Google Scholar]
  11. Carmo-Fonseca M., Kern H., Hurt E. C. Human nucleoporin p62 and the essential yeast nuclear pore protein NSP1 show sequence homology and a similar domain organization. Eur J Cell Biol. 1991 Jun;55(1):17–30. [PubMed] [Google Scholar]
  12. Cordes V. C., Reidenbach S., Köhler A., Stuurman N., van Driel R., Franke W. W. Intranuclear filaments containing a nuclear pore complex protein. J Cell Biol. 1993 Dec;123(6 Pt 1):1333–1344. doi: 10.1083/jcb.123.6.1333. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Cordes V., Waizenegger I., Krohne G. Nuclear pore complex glycoprotein p62 of Xenopus laevis and mouse: cDNA cloning and identification of its glycosylated region. Eur J Cell Biol. 1991 Jun;55(1):31–47. [PubMed] [Google Scholar]
  14. Dabauvalle M. C., Benavente R., Chaly N. Monoclonal antibodies to a Mr 68,000 pore complex glycoprotein interfere with nuclear protein uptake in Xenopus oocytes. Chromosoma. 1988 Nov;97(3):193–197. doi: 10.1007/BF00292960. [DOI] [PubMed] [Google Scholar]
  15. Dabauvalle M. C., Loos K., Scheer U. Identification of a soluble precursor complex essential for nuclear pore assembly in vitro. Chromosoma. 1990 Dec;100(1):56–66. doi: 10.1007/BF00337603. [DOI] [PubMed] [Google Scholar]
  16. Dabauvalle M. C., Schulz B., Scheer U., Peters R. Inhibition of nuclear accumulation of karyophilic proteins in living cells by microinjection of the lectin wheat germ agglutinin. Exp Cell Res. 1988 Jan;174(1):291–296. doi: 10.1016/0014-4827(88)90163-2. [DOI] [PubMed] [Google Scholar]
  17. Davis L. I., Blobel G. Identification and characterization of a nuclear pore complex protein. Cell. 1986 Jun 6;45(5):699–709. doi: 10.1016/0092-8674(86)90784-1. [DOI] [PubMed] [Google Scholar]
  18. Davis L. I., Fink G. R. The NUP1 gene encodes an essential component of the yeast nuclear pore complex. Cell. 1990 Jun 15;61(6):965–978. doi: 10.1016/0092-8674(90)90062-j. [DOI] [PubMed] [Google Scholar]
  19. Fabre E., Boelens W. C., Wimmer C., Mattaj I. W., Hurt E. C. Nup145p is required for nuclear export of mRNA and binds homopolymeric RNA in vitro via a novel conserved motif. Cell. 1994 Jul 29;78(2):275–289. doi: 10.1016/0092-8674(94)90297-6. [DOI] [PubMed] [Google Scholar]
  20. Fang F., Newport J. W. Distinct roles of cdk2 and cdc2 in RP-A phosphorylation during the cell cycle. J Cell Sci. 1993 Nov;106(Pt 3):983–994. doi: 10.1242/jcs.106.3.983. [DOI] [PubMed] [Google Scholar]
  21. Feldherr C. M., Kallenbach E., Schultz N. Movement of a karyophilic protein through the nuclear pores of oocytes. J Cell Biol. 1984 Dec;99(6):2216–2222. doi: 10.1083/jcb.99.6.2216. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Finlay D. R., Forbes D. J. Reconstitution of biochemically altered nuclear pores: transport can be eliminated and restored. Cell. 1990 Jan 12;60(1):17–29. doi: 10.1016/0092-8674(90)90712-n. [DOI] [PubMed] [Google Scholar]
  23. Finlay D. R., Meier E., Bradley P., Horecka J., Forbes D. J. A complex of nuclear pore proteins required for pore function. J Cell Biol. 1991 Jul;114(1):169–183. doi: 10.1083/jcb.114.1.169. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Finlay D. R., Newmeyer D. D., Price T. M., Forbes D. J. Inhibition of in vitro nuclear transport by a lectin that binds to nuclear pores. J Cell Biol. 1987 Feb;104(2):189–200. doi: 10.1083/jcb.104.2.189. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. Forbes D. J. Structure and function of the nuclear pore complex. Annu Rev Cell Biol. 1992;8:495–527. doi: 10.1146/annurev.cb.08.110192.002431. [DOI] [PubMed] [Google Scholar]
  26. Gerace L. Molecular trafficking across the nuclear pore complex. Curr Opin Cell Biol. 1992 Aug;4(4):637–645. doi: 10.1016/0955-0674(92)90083-o. [DOI] [PubMed] [Google Scholar]
  27. Goldberg M. W., Allen T. D. High resolution scanning electron microscopy of the nuclear envelope: demonstration of a new, regular, fibrous lattice attached to the baskets of the nucleoplasmic face of the nuclear pores. J Cell Biol. 1992 Dec;119(6):1429–1440. doi: 10.1083/jcb.119.6.1429. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Grandi P., Doye V., Hurt E. C. Purification of NSP1 reveals complex formation with 'GLFG' nucleoporins and a novel nuclear pore protein NIC96. EMBO J. 1993 Aug;12(8):3061–3071. doi: 10.1002/j.1460-2075.1993.tb05975.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Hanover J. A., Cohen C. K., Willingham M. C., Park M. K. O-linked N-acetylglucosamine is attached to proteins of the nuclear pore. Evidence for cytoplasmic and nucleoplasmic glycoproteins. J Biol Chem. 1987 Jul 15;262(20):9887–9894. [PubMed] [Google Scholar]
  30. Hartl P., Olson E., Dang T., Forbes D. J. Nuclear assembly with lambda DNA in fractionated Xenopus egg extracts: an unexpected role for glycogen in formation of a higher order chromatin intermediate. J Cell Biol. 1994 Feb;124(3):235–248. doi: 10.1083/jcb.124.3.235. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Hinshaw J. E., Carragher B. O., Milligan R. A. Architecture and design of the nuclear pore complex. Cell. 1992 Jun 26;69(7):1133–1141. doi: 10.1016/0092-8674(92)90635-p. [DOI] [PubMed] [Google Scholar]
  32. Holt G. D., Snow C. M., Senior A., Haltiwanger R. S., Gerace L., Hart G. W. Nuclear pore complex glycoproteins contain cytoplasmically disposed O-linked N-acetylglucosamine. J Cell Biol. 1987 May;104(5):1157–1164. doi: 10.1083/jcb.104.5.1157. [DOI] [PMC free article] [PubMed] [Google Scholar]
  33. 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]
  34. Laskey R. A., Leno G. H. Assembly of the cell nucleus. Trends Genet. 1990 Dec;6(12):406–410. doi: 10.1016/0168-9525(90)90301-l. [DOI] [PubMed] [Google Scholar]
  35. Lee C., Levin A., Branton D. Copper staining: a five-minute protein stain for sodium dodecyl sulfate-polyacrylamide gels. Anal Biochem. 1987 Nov 1;166(2):308–312. doi: 10.1016/0003-2697(87)90579-3. [DOI] [PubMed] [Google Scholar]
  36. Lohka M. J., Masui Y. Formation in vitro of sperm pronuclei and mitotic chromosomes induced by amphibian ooplasmic components. Science. 1983 May 13;220(4598):719–721. doi: 10.1126/science.6601299. [DOI] [PubMed] [Google Scholar]
  37. Macaulay C., Meier E., Forbes D. J. Differential mitotic phosphorylation of proteins of the nuclear pore complex. J Biol Chem. 1995 Jan 6;270(1):254–262. doi: 10.1074/jbc.270.1.254. [DOI] [PubMed] [Google Scholar]
  38. Miller M. W., Hanover J. A. Functional nuclear pores reconstituted with beta 1-4 galactose-modified O-linked N-acetylglucosamine glycoproteins. J Biol Chem. 1994 Mar 25;269(12):9289–9297. [PubMed] [Google Scholar]
  39. Moore M. S., Blobel G. The two steps of nuclear import, targeting to the nuclear envelope and translocation through the nuclear pore, require different cytosolic factors. Cell. 1992 Jun 12;69(6):939–950. doi: 10.1016/0092-8674(92)90613-h. [DOI] [PubMed] [Google Scholar]
  40. Nehrbass U., Kern H., Mutvei A., Horstmann H., Marshallsay B., Hurt E. C. NSP1: a yeast nuclear envelope protein localized at the nuclear pores exerts its essential function by its carboxy-terminal domain. Cell. 1990 Jun 15;61(6):979–989. doi: 10.1016/0092-8674(90)90063-k. [DOI] [PubMed] [Google Scholar]
  41. Newmeyer D. D., Forbes D. J. An N-ethylmaleimide-sensitive cytosolic factor necessary for nuclear protein import: requirement in signal-mediated binding to the nuclear pore. J Cell Biol. 1990 Mar;110(3):547–557. doi: 10.1083/jcb.110.3.547. [DOI] [PMC free article] [PubMed] [Google Scholar]
  42. Newmeyer D. D., Forbes D. J. Nuclear import can be separated into distinct steps in vitro: nuclear pore binding and translocation. Cell. 1988 Mar 11;52(5):641–653. doi: 10.1016/0092-8674(88)90402-3. [DOI] [PubMed] [Google Scholar]
  43. Newmeyer D. D., Lucocq J. M., Bürglin T. R., De Robertis E. M. Assembly in vitro of nuclei active in nuclear protein transport: ATP is required for nucleoplasmin accumulation. EMBO J. 1986 Mar;5(3):501–510. doi: 10.1002/j.1460-2075.1986.tb04239.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  44. Newport J. Nuclear reconstitution in vitro: stages of assembly around protein-free DNA. Cell. 1987 Jan 30;48(2):205–217. doi: 10.1016/0092-8674(87)90424-7. [DOI] [PubMed] [Google Scholar]
  45. Newport J., Spann T. Disassembly of the nucleus in mitotic extracts: membrane vesicularization, lamin disassembly, and chromosome condensation are independent processes. Cell. 1987 Jan 30;48(2):219–230. doi: 10.1016/0092-8674(87)90425-9. [DOI] [PubMed] [Google Scholar]
  46. Osborne M. A., Silver P. A. Nucleocytoplasmic transport in the yeast Saccharomyces cerevisiae. Annu Rev Biochem. 1993;62:219–254. doi: 10.1146/annurev.bi.62.070193.001251. [DOI] [PubMed] [Google Scholar]
  47. Panté N., Aebi U. The nuclear pore complex. J Cell Biol. 1993 Sep;122(5):977–984. doi: 10.1083/jcb.122.5.977. [DOI] [PMC free article] [PubMed] [Google Scholar]
  48. Panté N., Bastos R., McMorrow I., Burke B., Aebi U. Interactions and three-dimensional localization of a group of nuclear pore complex proteins. J Cell Biol. 1994 Aug;126(3):603–617. doi: 10.1083/jcb.126.3.603. [DOI] [PMC free article] [PubMed] [Google Scholar]
  49. Richardson W. D., Mills A. D., Dilworth S. M., Laskey R. A., Dingwall C. Nuclear protein migration involves two steps: rapid binding at the nuclear envelope followed by slower translocation through nuclear pores. Cell. 1988 Mar 11;52(5):655–664. doi: 10.1016/0092-8674(88)90403-5. [DOI] [PubMed] [Google Scholar]
  50. Robinson P. A., Anderton B. H., Loviny T. L. Nitrocellulose-bound antigen repeatedly used for the affinity purification of specific polyclonal antibodies for screening DNA expression libraries. J Immunol Methods. 1988 Apr 6;108(1-2):115–122. doi: 10.1016/0022-1759(88)90409-7. [DOI] [PubMed] [Google Scholar]
  51. Rout M. P., Wente S. R. Pores for thought: nuclear pore complex proteins. Trends Cell Biol. 1994 Oct;4(10):357–365. doi: 10.1016/0962-8924(94)90085-x. [DOI] [PubMed] [Google Scholar]
  52. Schlenstedt G., Hurt E., Doye V., Silver P. A. Reconstitution of nuclear protein transport with semi-intact yeast cells. J Cell Biol. 1993 Nov;123(4):785–798. doi: 10.1083/jcb.123.4.785. [DOI] [PMC free article] [PubMed] [Google Scholar]
  53. Sheehan M. A., Mills A. D., Sleeman A. M., Laskey R. A., Blow J. J. Steps in the assembly of replication-competent nuclei in a cell-free system from Xenopus eggs. J Cell Biol. 1988 Jan;106(1):1–12. doi: 10.1083/jcb.106.1.1. [DOI] [PMC free article] [PubMed] [Google Scholar]
  54. Smythe C., Newport J. W. Systems for the study of nuclear assembly, DNA replication, and nuclear breakdown in Xenopus laevis egg extracts. Methods Cell Biol. 1991;35:449–468. doi: 10.1016/s0091-679x(08)60583-x. [DOI] [PubMed] [Google Scholar]
  55. Snow C. M., Senior A., Gerace L. Monoclonal antibodies identify a group of nuclear pore complex glycoproteins. J Cell Biol. 1987 May;104(5):1143–1156. doi: 10.1083/jcb.104.5.1143. [DOI] [PMC free article] [PubMed] [Google Scholar]
  56. Wente S. R., Blobel G. NUP145 encodes a novel yeast glycine-leucine-phenylalanine-glycine (GLFG) nucleoporin required for nuclear envelope structure. J Cell Biol. 1994 Jun;125(5):955–969. doi: 10.1083/jcb.125.5.955. [DOI] [PMC free article] [PubMed] [Google Scholar]
  57. Wente S. R., Rout M. P., Blobel G. A new family of yeast nuclear pore complex proteins. J Cell Biol. 1992 Nov;119(4):705–723. doi: 10.1083/jcb.119.4.705. [DOI] [PMC free article] [PubMed] [Google Scholar]
  58. Wilken N., Kossner U., Senécal J. L., Scheer U., Dabauvalle M. C. Nup180, a novel nuclear pore complex protein localizing to the cytoplasmic ring and associated fibrils. J Cell Biol. 1993 Dec;123(6 Pt 1):1345–1354. doi: 10.1083/jcb.123.6.1345. [DOI] [PMC free article] [PubMed] [Google Scholar]
  59. Wimmer C., Doye V., Grandi P., Nehrbass U., Hurt E. C. A new subclass of nucleoporins that functionally interact with nuclear pore protein NSP1. EMBO J. 1992 Dec;11(13):5051–5061. doi: 10.1002/j.1460-2075.1992.tb05612.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  60. Wolff B., Willingham M. C., Hanover J. A. Nuclear protein import: specificity for transport across the nuclear pore. Exp Cell Res. 1988 Oct;178(2):318–334. doi: 10.1016/0014-4827(88)90402-8. [DOI] [PubMed] [Google Scholar]
  61. Yaffe M. P., Schatz G. Two nuclear mutations that block mitochondrial protein import in yeast. Proc Natl Acad Sci U S A. 1984 Aug;81(15):4819–4823. doi: 10.1073/pnas.81.15.4819. [DOI] [PMC free article] [PubMed] [Google Scholar]
  62. Yoneda Y., Imamoto-Sonobe N., Yamaizumi M., Uchida T. Reversible inhibition of protein import into the nucleus by wheat germ agglutinin injected into cultured cells. Exp Cell Res. 1987 Dec;173(2):586–595. doi: 10.1016/0014-4827(87)90297-7. [DOI] [PubMed] [Google Scholar]

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