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Nuclear transport in vitro.

D R Finlay1, D D Newmeyer, P M Hartl

  • 1Department of Biology, University of California, San Diego, La Jolla 92014.

Journal of Cell Science. Supplement
|January 1, 1989
PubMed
Summary
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Researchers developed an in vitro system to study nuclear transport, identifying ATP as crucial for protein translocation through the nuclear pore. Wheat germ agglutinin (WGA) was found to inhibit transport by binding to nuclear pore glycoproteins.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Understanding nucleus-cytoplasm communication is vital.
  • Nuclear transport is a highly selective process.
  • An in vitro system aids in dissecting nuclear transport mechanisms.

Purpose of the Study:

  • To develop and utilize an in vitro system to study nuclear targeting and transport.
  • To define basic parameters of nuclear transport.
  • To investigate the interaction of nuclear targeting signals with the nuclear pore.

Main Methods:

  • Developed an in vitro nuclear transport system.
  • Constructed artificial nuclear transport substrates using protein conjugates (HSA-SV40 T-antigen signal sequence).
  • Utilized fluorescently labeled and gold-tagged conjugates for transport assays; employed wheat germ agglutinin (WGA) as an inhibitor.

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Main Results:

  • The in vitro system accurately distinguished between wild-type and mutant signal sequences.
  • Nuclear transport was ATP-dependent.
  • Wheat germ agglutinin (WGA) inhibited transport by binding to nuclear pore glycoproteins (e.g., 62K MW).
  • Nuclear transport was resolved into two steps: ATP-independent pore binding and ATP-dependent translocation.

Conclusions:

  • The developed in vitro system effectively models nuclear transport.
  • Nuclear pore glycoproteins are involved in nuclear import.
  • Nuclear transport involves distinct binding and translocation steps, with translocation being ATP-dependent.