Sequence determinants for hnRNP I protein nuclear localization.

Abstract:

:hnRNP I, also referred to as polypyrimidine tract binding protein, is one of the proteins associated with nascent pre-mRNA in the heterogeneous nuclear ribonucleoprotein (hnRNP) complexes. As for all karyophilic proteins, the nuclear import of hnRNP proteins requires specific sequence determinants that in many instances differ from the canonical import signal. In order to identify the sequences responsible for the nuclear localization, various hnRNP I portions were fused to a reporter protein (bacterial chloramphenicol acetyl transferase) and used in transient transfection assay. By this approach we identified a 60-amino-acid sequence located at the amino terminus of hnRNP I (designated NLD-I) that is both necessary and sufficient for nuclear localization. NLD-I represents a novel bipartite type of nuclear localization signal that bears no resemblance to other nuclear localization determinants so far identified in hnRNP proteins.

journal_name

Exp Cell Res

authors

Romanelli MG,Weighardt F,Biamonti G,Riva S,Morandi C

doi

10.1006/excr.1997.3677

subject

Has Abstract

pub_date

1997-08-25 00:00:00

pages

300-4

issue

1

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(97)93677-6

journal_volume

235

pub_type

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