metabolism (chapter 8) - valenciafd.valenciacollege.edu/file/sclark/metabolism (8).pdf · 2007. 1....
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metabolism(chapter 8)
The laws of ThermodynamicsThe laws of Thermodynamicsas dictated by the Universeas dictated by the Universe
1) Energy can neitherbe created nor destroyed,
but only converted.
2) Entropy is alwaysincreasing in any
spontaneous process.
potential
potential
potential
kinetic
potential
kinetic
kinetic
kinetic
Did I pack my hair
gel?
-7.3 kcal/moleof ATP
transfer of
phosphate group
catabolism anabolism
enzyme function . . .
organic catalysts
factors affecting enzyme activity
a) enzyme activity as a function ofsubstrate concentration
b) enzyme activity as a function oftemperature
c) enzyme activity as a function of pH
substrate concentration
0
10
20
30
40
50
60
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95100
Substrate Concentration
Rea
ctio
n ra
te (s
ubst
rate
to p
rodu
ct /
min
)
temperature
0
10
20
30
40
50
60
0 5 10 15 20 25 30 35 40 45 50 55 60
Temperature (C)
Rea
ctio
n ra
te (s
ubst
rate
to p
rodu
ct /
min
)
pH
0
10
20
30
40
50
60
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
pH
Rea
ctio
n ra
te (s
ubst
rate
to p
rodu
ct /
min
)
regulation of metabolism throughenzyme inhibition
a) competitive inhibition
b) noncompetitive (allosteric) inhibition
c) feedback inhibition
competitive inhibition . . .
noncompetitive inhibition . . .
typical metabolic pathway . . .
feedback inhibition . . .
enzyme helpers
a) cofactorsinorganic; metal atoms
(e.g. zinc, iron, copper)
b) coenzymesorganic; vitamins