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Voltage-
dependent
P/Q-type
calcium channel
subunit
alpha-1A
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Ryanodine
receptor 2
Tropomyosin
alpha-1 chain
Tropomyosin
beta chain
Potassium
voltage-gated
channel
subfamily D
member 3
Kv channel-
interacting
protein 2
Potassium
voltage-gated
channel
subfamily E
member 2
Potassium
voltage-gated
channel
subfamily H
member 2
Putative Dol-P-
Glc:Glc(2)Man(9)GlcNAc(2)-
PP-Dol
alpha-1,2-
glucosyltransferase
Potassium
voltage-gated
channel
subfamily KQT
member 1
Potassium
voltage-gated
channel
subfamily E
member 1
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
Inward
rectifier
potassium
channel 2
Inward
rectifier
potassium
channel 4
Potassium
voltage-gated
channel
subfamily A
member 5
Disks large
homolog 1
G protein-
activated
inward
rectifier
potassium
channel 1
G protein-
activated
inward
rectifier
potassium
channel 4
Potassium
channel
subfamily K
member 1
Potassium/sodium
hyperpolarization-
activated
cyclic
nucleotide-
gated channel 4
Voltage-
dependent
T-type calcium
channel subunit
alpha-1H
Voltage-
dependent
T-type calcium
channel subunit
alpha-1G
Sodium channel
protein type 5
subunit alpha
cAMP-dependent
protein kinase
catalytic
subunit alpha
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-2
cAMP
Ca
+
Verapamil
Ca
+
Ca
+
Ca
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
Na
+
Na
+
K
+
Na
+
Na
+
Verapamil
cAMP-dependent
protein kinase
type I-alpha
regulatory
subunit
Troponin
Troponin
Muscle
Contraction
Ca
+
T-tubule
Cardiomyocyte
By slowing depolarization,
the cell cannot effectively
propagate an action
potential and electrical
signals for ventricular
contractions are slowed
Low calcium levels means
calcium is not readily
available to bind to
troponin, which as a result
blocks muscle contraction
from occurring
Actin
Myosin
Actin unbinds from myosin
resulting in the filaments
to slide and smooth muscle
relaxation to occur
Verapamil blocks L-type
calcium channels blocking
the entry of calcium and
reducing the current needed
for depolarization.
Sarcoplasmic Reticulum
Verapamil is taken
intravenously
CACNA1A
CACNB1
RYR2
TPM1
TPM2
KCND3
KCNIP2
KCNE2
KCNH2
ALG10B
KCNQ1
KCNE1
ABCC8
KCNJ8
KCNJ11
Unknown
KCNJ2
KCNJ4
Unknown
Unknown
KCNJ3
KCNJ5
KCNK1
HCN4
CACNA1H
CACNA1G
SCN5A
PRKACA
CACNA2D2
cAMP
Calcium
Verapamil
Calcium
Calcium
Calcium
Potassium
Potassium
Potassium
Potassium
Potassium
Potassium
Potassium
Potassium
Potassium
Sodium
Sodium
Potassium
Sodium
Sodium
Verapamil
PRKAR1A
Troponin
Troponin
Muscle
Contraction
Calcium