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Myosin light
chain kinase,
smooth muscle
Adenylate
cyclase type 9
PKA complex
PKA complex
Protein kinase
C
Beta-2
adrenergic
receptor
G protein
complex
Myosin LC-P
Myosin light
chain 3
Inositol 1,4,5-
trisphosphate
receptor type 1
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
L-type calcium
channel subunit
alpha-1C
Myosin light
chain
phosphatase
Calmodulin
Intermediate
conductance
calcium-
activated
potassium
channel protein
4
Phospholipase C
Guanine
nucleotide-
binding protein
alpha
Calmodulin
Guanine
nucleotide-
binding protein
G(I)/G(S)/G(T)
subunit beta-1
Guanine
nucleotide-
binding protein
G(I)/G(S)/G(O)
subunit
gamma-12
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-1
Epinephrine
Ca
+
Ca
+
Ca
+
K
+
K
+
GDP
GTP
ATP
cAMP
Inositol 1,4,5-trisphosphate
Phosphatidylinositol
4,5-bisphosphate
Diacylglycerol
Dipivefrin
GTP
P
i
P
i
P
i
Calcium
Ca
+
Muscle
Contraction
Muscle
Relaxation
Magnesium
Calcium
Manganese
Sarcoplasmic Reticulum
Cytosol
Ciliary Smooth Muscle Cell
Dipivefrin (epinephrine)
binds to beta-2 adrenergic
receptor.
The G protein complex
separates into alpha and
beta/gamma subunits.
GDP is replaced with GTP on
the alpha subunit.
Activated PKA can
phosphorylate calcium
activated potassium channels
causing potassium efflux and
promoting hyperpolarization.