A Predominantly Nuclear Protein Affecting Cytoplasmic Localization of Beta-actin MRNA in Fibroblasts and Neurons

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2002 Jan 10

PMID 11781334

Citations 73

Authors

Wei Gu

Feng Pan

Honglai Zhang

Gary J Bassell

Robert H Singer

Affiliations

Soon will be listed here.

Abstract

The localization of beta-actin mRNA to the leading lamellae of chicken fibroblasts and neurite growth cones of developing neurons requires a 54-nt localization signal (the zipcode) within the 3' untranslated region. In this study we have identified and isolated five proteins binding to the zipcode. One of these we previously identified as zipcode binding protein (ZBP)1, a 4-KH domain protein. A second is now investigated in detail: a 92-kD protein, ZBP2, that is especially abundant in extracts from embryonic brain. We show that ZBP2 is a homologue of the human hnRNP protein, KSRP, that appears to mediate pre-mRNA splicing. However, ZBP2 has a 47-amino acid (aa) sequence not present in KSRP. Various portions of ZBP2 fused to GFP indicate that the protein most likely shuttles between the nucleus and the cytoplasm, and that the 47-aa insert promotes the nuclear localization. Expression of a truncated ZBP2 inhibits the localization of beta-actin mRNA in both fibroblast and neurons. These data suggest that ZBP2, although predominantly a nuclear protein, has a role in the cytoplasmic localization of beta-actin mRNA.

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