Raver1, a dual compartment protein, is a ligand for PTB/hnRNPI and microfilament attachment proteins

Citation
S. Huttelmaier et al., Raver1, a dual compartment protein, is a ligand for PTB/hnRNPI and microfilament attachment proteins, J CELL BIOL, 155(5), 2001, pp. 775-785
Citations number
61
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Cell & Developmental Biology
Journal title
JOURNAL OF CELL BIOLOGY
ISSN journal
0021-9525 → ACNP
Volume
155
Issue
5
Year of publication
2001
Pages
775 - 785
Database
ISI
SICI code
0021-9525(20011126)155:5<775:RADCPI>2.0.ZU;2-B
Abstract
By screening a yeast two-hybrid library with COOH-terminal fragments of vin culin/metavinculin as the bait, we identified a new protein termed raver1. Raver1 is an 80-kD multidomain protein and widely expressed but to varying amounts in different cell lines. In situ and in vitro, raver1 forms complex es with the microfilament-associated proteins vinculin, metavinculin, and a lpha -actinin and colocalizes with vinculin/metavinculin and a-actinin at m icrofilament attachment sites, such as cell-cell and cell matrix contacts o f epithelial cells and fibroblasts, respectively, and in costameres of skel etal muscle. The NH2-terminal part of raver1 contains three RNA recognition motifs with homology to members of the heterogeneous nuclear RNP (hnRNP) f amily. Raver1 colocalizes with polypyrimidine tract binding protein (PTB)/h nRNP1, a protein involved in RNA splicing of microfilament proteins, in the perinucleolar compartment and forms complexes with PTB/hnRNP1. Hence, rave r1 is a dual compartment protein, which is consistent with the presence of nuclear location signal and nuclear export sequence motifs in its sequence. During muscle differentiation, raver1 migrates from the nucleus to the cos tamere. We propose that raver1 may coordinate RNA processing and targeting as required for microfilament anchoring in specific adhesion sites.