The two steps of nuclear import, targeting to the nuclear envelope and translocation through the nuclear pore, require different cytosolic factors.

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Moore MS, 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):939-50.

PubMed ID
1606616 [ View in PubMed
]
Abstract

We have isolated two cytosolic fractions from Xenopus oocytes that contain all of the activity necessary to support both steps of nuclear import in digitonin-permeabilized mammalian cells: binding at the nuclear envelope and translocation through the nuclear pore. The first cytosolic fraction (fraction A) interacts with an import-competent, but not a mutant, nuclear localization sequence-bearing conjugate and stimulates its accumulation at the nuclear envelope in an ATP-independent fashion. The second cytosolic fraction (fraction B) gives no discernible effect when added alone; but when added either together with fraction A, or after fraction A, stimulates the passage of the conjugate from the outer nuclear envelope to the interior of the nucleus in an ATP-dependent fashion.

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