Toggle navigation
SMPDB
Browse SMPDB
Pathways
Table of Primary Pathways
Compounds
Proteins
Search
TextQuery Search Instructions
SMP-MAP Advanced Search
ChemQuery Structure Search
Molecular Weight Search
Sequence Search
About
About SMPDB
Release Notes
Citing SMPDB
Statistics
Other Databases
Pathway Legend
Pathway Category Definitions
PathWhiz
Downloads
Contact Us
Quantitative metabolomics services for biomarker discovery and validation.
Specializing in ready to use metabolomics kits.
Your source for quantitative metabolomics technologies and bioinformatics.
Loading Pathway...
Error: Pathway image not found.
Adenylate
cyclase type 10
Myosin light
chain kinase,
smooth muscle
PKA complex
PKA complex
Protein kinase
C
Muscarinic
acetylcholine
receptor M2
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
ATP-binding
cassette
sub-family C
member 8
ATP-sensitive
inward
rectifier
potassium
channel 8
ATP-sensitive
inward
rectifier
potassium
channel 11
ATP-binding
cassette
sub-family C
member 9
Calmodulin
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-1
Pilocarpine
Ca
+
Ca
+
K
+
K
+
Ca
+
K
+
K
+
ATP
cAMP
Inositol 1,4,5-trisphosphate
Phosphatidylinositol
4,5-bisphosphate
Diacylglycerol
P
i
P
i
P
i
P
i
Calcium
Ca
+
Muscle
Contraction
Muscle
Relaxation
G Protien
Signalling
Cascade
Magnesium
Calcium
Manganese
Sarcoplasmic Reticulum
Cytosol
Ciliary Muscle Cell
Activated PKA can
phosphorylate calcium
activated potassium channels
causing potassium efflux and
promoting hyperpolarization.
Activated PKA phosphorylates
the IP3 receptor to reduce
its affinity for IP3.
Activated PKA phosphorylates
phospholipase C.
There is an overall decrease
in calcium levels in the
cytosol.
Decreased calcium is unable
to bind readily to
calmodulin.
The inhibition of myosin
light chain kinase prevents
the synthesis of Myosin LC-P
which leads to a high
concentration of myosin
light chain and muscle
relaxation.
Myosin binds actin causing
the sarcomere filaments to
slide resulting in muscle
contraction.
Activates ATP-sensitive
potassium channels via cAMP
mediated phosphorylation.
Actin Filament
Myosin Filament
Since the receptor isn't
activated, adenylyl cyclase
is no longer inhibited
allowing for cAMP production
M2 receptors activate Gi
protein signalling which
inhibits adenylyl cyclase
Pilocarpine is a M2
muscarinic receptor agonist
Pilocarpine is administered
as an eye drop