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Papers In Press, published online ahead of print July 9, 2001
J. Biol. Chem, 10.1074/jbc.C100207200
Submitted on April 20, 2001
Revised on July 9, 2001
Accepted on July 6, 2001
BIDMC, Boston, MA 02215
Corresponding Author: ccarpent{at}caregroup.harvard.edu
Inactivating mutations in the serine-threonine kinase LKB1 (STK11) are found in most patients with Peutz-Jeghers syndrome, however the function of LKB1 is unknown. We found that LKB1 binds to and regulates brahma-related gene 1 (Brg1), an essential component of chromatin remodeling complexes. The association requires the N-terminus of LKB1 and the helicase domain of Brg1 and LKB1 stimulates the ATPase activity of Brg1. Brg1 expression in SW13 cells induces the formation of flat cells indicative of cell cycle arrest and senescence. Expression of a kinase dead mutant of LKB1, SL26, in SW13 cells blocks the formation of Brg1-induced flat cells, indicating that LKB1 is required for Brg1-dependent growth arrest. The inability of mutants of LKB1 to mediate Brg1-dependent growth arrest may explain the manifestations of Peutz-Jeghers syndrome.
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