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Rafalska, I.* ; Zhang, Z.* ; Benderska, N.* ; Wolff, H. ; Hartmann, A.M.* ; Brack-Werner, R. ; Stamm, S.*

The intranuclear localization and function of YT521-B is regulated by tyrosine phosphorylation.

Hum. Mol. Genet. 13, 1535-1549 (2004)
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YT521-B is a ubiquitously expressed nuclear protein that changes alternative splice site usage in a concentration dependent manner. YT521-B is located in a dynamic nuclear compartment, the YT body. We show that YT521-B is tyrosine phosphorylated by c-Abl in the nucleus. The protein shuttles between nucleus and cytosol, where it can be phosphorylated by c-Src or p59(fyn). Tyrosine phosphorylation causes dispersion of YT521-B from YT bodies to the nucleoplasm. Whereas YT bodies are soluble in non-denaturing buffers, the phosphorylated, dispersed form is non-soluble. Non-phosphorylated YT521-B changes alternative splice site selection of the IL-4 receptor, CD44 and SRp20, but phosphorylation of c-Abl minimizes this concentration dependent effect. We propose that tyrosine phosphorylation causes sequestration of YT521-B in an insoluble nuclear form, which abolishes the ability of YT521-B to change alternative splice sites.
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Publication type Article: Journal article
Document type Scientific Article
Keywords PRE-MESSENGER-RNA; ALTERNATIVE SPLICING PATTERNS; GENOME-WIDE DETECTION; GROWTH-FACTOR; C-ABL; DEPENDENT REGULATION; EXPRESSED SEQUENCES; PREMESSENGER RNA; PROTEIN-KINASES; SITE SELECTION
ISSN (print) / ISBN 0964-6906
e-ISSN 1460-2083
Quellenangaben Volume: 13, Issue: 15, Pages: 1535-1549 Article Number: , Supplement: ,
Publisher Oxford University Press
Reviewing status Peer reviewed