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(Received for publication, July 19, 1996, and in revised form, September 10, 1996)
From the Department of Molecular Pharmacology, Diabetes and
Metabolic Diseases Research Center, School of Medicine-HSC, State
University of New York, Stony Brook, New York 11794-8651
Morphogen-induced decline in Gi
Volume 271, Number 48,
Issue of November 29, 1996
pp. 30692-30698
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
2/Gs
Axis
via Phospholipase C and Not Adenylylcyclase
triggers F9 teratocarcinoma stem cells to progress to primitive
endoderm via activation of protein kinase C and mitogen-activated
protein kinase (Gao, P., and Malbon, C. C. (1996) J. Biol.
Chem. 271, 9002-9008). Constitutive expression of
Gi
2 blocks, whereas expression of Gs
provokes, progression to primitive endoderm, permitting identification
of the effectors of the response-utilizing chimera created between Gi
2 and Gs
. N-terminal substitution of
Gs
with Gi
2 sequence to create chimera
Gi
2 (1-54)/Gs
produced a chimera that
activated adenylylcyclase but abolished progression to primitive
endoderm and activation of phospholipase C. C-terminal substitution of
Gs
with Gi
2 sequence to
Gs
/Gi
2 (320-355) enhanced the ability of
Gs
to promote progression. The Q205L-activated mutant of
Gi
2 suppresses, whereas the G225T-activated mutant of
Gs
strongly activates phospholipase C and progression in
these cells. The N-terminal region of Gs
(residues
62-86) appears to act as a dominant switch for the Gs
-
(activation) versus Gi
2- (suppression)
mediated control of phospholipase C and progression to primitive
endoderm.
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