αB-crystallin interacts with and prevents stress-activated proteolysis of focal adhesion kinase by calpain in cardiomyocytes

Focal adhesion kinase (FAK) contributes to cellular homeostasis under stress conditions. Here we show that αB-crystallin interacts with and confers protection to FAK against calpain-mediated proteolysis in cardiomyocytes. A hydrophobic patch mapped between helices 1 and 4 of the FAK FAT domain was f...

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Veröffentlicht in:Nature communications 2014-10, Vol.5 (1), p.5159-5159, Article 5159
Hauptverfasser: Pereira, Michelle B. M., Santos, Aline M., Gonçalves, Danieli C., Cardoso, Alisson C., Consonni, Sílvio R., Gozzo, Fabio C., Oliveira, Paulo S., Pereira, Ana Helena M., Figueiredo, Alana R., Tiroli-Cepeda, Ana O., Ramos, Carlos H. I., de Thomaz, André A., Cesar, Carlos L., Franchini, Kleber G.
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container_issue 1
container_start_page 5159
container_title Nature communications
container_volume 5
creator Pereira, Michelle B. M.
Santos, Aline M.
Gonçalves, Danieli C.
Cardoso, Alisson C.
Consonni, Sílvio R.
Gozzo, Fabio C.
Oliveira, Paulo S.
Pereira, Ana Helena M.
Figueiredo, Alana R.
Tiroli-Cepeda, Ana O.
Ramos, Carlos H. I.
de Thomaz, André A.
Cesar, Carlos L.
Franchini, Kleber G.
description Focal adhesion kinase (FAK) contributes to cellular homeostasis under stress conditions. Here we show that αB-crystallin interacts with and confers protection to FAK against calpain-mediated proteolysis in cardiomyocytes. A hydrophobic patch mapped between helices 1 and 4 of the FAK FAT domain was found to bind to the β4–β8 groove of αB-crystallin. Such an interaction requires FAK tyrosine 925 and is enhanced following its phosphorylation by Src, which occurs upon FAK stimulation. αB-crystallin silencing results in calpain-dependent FAK depletion and in the increased apoptosis of cardiomyocytes in response to mechanical stress. FAK overexpression protects cardiomyocytes depleted of αB-crystallin against the stretch-induced apoptosis. Consistently, load-induced apoptosis is blunted in the hearts from cardiac-specific FAK transgenic mice transiently depleted of αB-crystallin by RNA interference. These studies define a role for αB-crystallin in controlling FAK function and cardiomyocyte survival through the prevention of calpain-mediated degradation of FAK. Focal adhesion kinase (FAK) is a scaffold and tyrosine kinase protein, critical for proper cardiac function under stress conditions. Here the authors show that the small heat–shock protein αB-crystallin interacts with FAK and protects it from calpain-mediated proteolysis in stressed rat cardiomyocytes.
doi_str_mv 10.1038/ncomms6159
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ispartof Nature communications, 2014-10, Vol.5 (1), p.5159-5159, Article 5159
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subjects 101/58
13
14
14/19
42/70
42/89
631/80/474
631/80/86/2366
692/699/75
82
96
96/2
alpha-Crystallin B Chain - chemistry
Animals
Aorta - metabolism
Apoptosis
Calpain - metabolism
Cell Survival
Fluorescence Resonance Energy Transfer
Focal Adhesion Protein-Tyrosine Kinases - metabolism
Gene Expression Regulation, Enzymologic
Gene Silencing
Homeostasis
Humanities and Social Sciences
Male
Mice
Mice, Transgenic
Microscopy, Fluorescence
Models, Molecular
multidisciplinary
Myocardium - metabolism
Myocytes, Cardiac - cytology
Phosphorylation
Protein Structure, Secondary
Protein Structure, Tertiary
Rats
Rats, Wistar
Science
Science (multidisciplinary)
src-Family Kinases - metabolism
Stress, Mechanical
title αB-crystallin interacts with and prevents stress-activated proteolysis of focal adhesion kinase by calpain in cardiomyocytes
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