alpha B-Crystallin interacts and attenuates the tyrosine phosphatase activity of Shp2 in cardiomyocytes under mechanical stress

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Author(s):	Goncalves, Danieli C. ; Marin, Talita M. ; Pereira, Michelle B. M. ; Santos, Aline M. ; Leme, Adriana F. Paes ; Franchini, Kleber G. Total Authors: 6
Document type:	Journal article
Source:	FEBS Letters; v. 590, n. 14, p. 2232-2240, JUL 2016.
Web of Science Citations:	2
Abstract
The small heat shock protein alpha B-Crystallin (CryAB, HspB5) and SH2 domain-containing tyrosine phosphatase 2 (Shp2) are important molecules in heart response to pathophysiological stress. Here we show that CryAB interacts with and potentially regulates Shp2 catalytic activity in stretched cardiomyocytes. Such an interaction requires CryAB oligomer to attenuate Shp2 activation. Stretched cardiomyocytes show a robust CryAB/Shp2 association accompanied by a reduction in the Shp2 phosphatase activity. Accordingly, CryAB knock-down in cardiomyocytes enhances Shp2 activity induced by mechanical stress. These results revealed a new role for CryAB, as a modulator of Shp2 phosphatase activity during a functionally relevant stimulus in cardiomyocytes. (AU)

FAPESP's process:	13/05877-8 - Structural and functional characterization of the interaction between alphaB-Crystallin and Shp2 tyrosine-phosphatase protein.
Grantee:	Danieli Cristina Gonçalves
Support type:	Scholarships in Brazil - Doctorate